Variable resonator and high-frequency variable filter circuit

Abstract

The variable resonator comprises a first substrate (10) having a first dielectric substrate (11), a ground conductor (12) arranged on the back surface of the first dielectric substrate (11), a signal conductor pattern (13) arranged on the surface of the first dielectric substrate (11), a first strip conductor pattern (14a) arranged on the surface of the first dielectric substrate (11) and having one end electrically connected to one side of the signal conductor pattern (13), and a second strip conductor pattern (14b) arranged on the surface of the first dielectric substrate (11) at a distance from the other end of the first strip conductor pattern (14a). , a second dielectric substrate (21), and a second substrate (20) having a third strip conductor pattern (22) arranged opposite the first strip conductor pattern (14a) and the second strip conductor pattern (14b) on the back surface of the second dielectric substrate (21); and a movable plate (30) connected to the front surface of the second substrate (20) and movable in the front-to-back direction of the second substrate (20) by a movable mechanism for moving the second substrate (20) in the front-to-back direction, for adjusting the distance between the front surface of the first substrate (10) and the back surface of the second substrate (20).

Description

[Technical Field]

[0001] The present disclosure relates to variable resonators and high-frequency variable filter circuits, and more particularly to variable resonators and high-frequency variable filter circuits used in communication devices in microwave and millimeter-wave communication systems. [Background technology]

[0002] Tunable microwave filters have attracted attention as high-frequency variable filter circuits used in communication devices in microwave and millimeter-wave communication systems, and Non-Patent Document 1 describes a mechanically tunable 2 GHz low-pass filter. The low-pass filter shown in Non-Patent Document 1 is composed of a combination of a series inductor and three shunt capacitors, and is equipped with a ground plane on whose surface a transmission line having three wide portions of different widths that constitute the three shunt capacitors is arranged, and a grounded upper cover that can be moved up and down to adjust the distance between the three wide portions. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] T.Michalski, b.Friedmann, and R.Kronberger, “A completely mechanical adjustable 2GHz low-pass filter,” IEEE Microwave Magazine, vol.10, no.1, pp.140-145, Feb.2009 Summary of the Invention [Problem to be solved by the invention]

[0004] In the low-pass filter described in Non-Patent Document 1, the transmission line placed on the ground plane and the grounded top cover always operate in a non-contact state, so the variable range of the passband cutoff frequency (GHz), which is the frequency band for transmitting high-frequency signals with a set frequency of 2 GHz or less, is narrow, and when converted into a ratio, it is only about 33%. That is, the variable range of frequencies that can be blocked among high frequency signals propagating through the transmission line is narrow.

[0005] The present disclosure is intended to solve the above-mentioned problems, and aims to provide a variable resonator having a wide adjustable range of the resonant frequency, which is the frequency at which the propagation of a propagating high-frequency signal is blocked. [Means for solving the problem]

[0006] The variable resonator according to the present disclosure comprises a first substrate having a first dielectric substrate, a ground conductor arranged on a rear surface of the first dielectric substrate, a signal conductor pattern arranged on a front surface of the first dielectric substrate, a first strip conductor pattern arranged on the front surface of the first dielectric substrate, one end of which is electrically connected to one side of the signal conductor pattern, and a second strip conductor pattern arranged on the front surface of the first dielectric substrate with a gap between it and the other end of the first strip conductor pattern; a second substrate having a second dielectric substrate and a third strip conductor pattern arranged on the rear surface of the second dielectric substrate, the third strip conductor pattern being arranged opposite the first strip conductor pattern and the second strip conductor pattern; and a movable plate connected to the front surface of the second substrate, movable in the front-to-back direction of the second substrate by a movable mechanism for moving the second substrate in the front-to-back direction, and for adjusting the distance between the front surface of the first substrate and the rear surface of the second substrate. [Effects of the Invention]

[0007] According to the present disclosure, in particular in variable resonators used in communication devices in microwave and millimeter wave communication systems, the variable frequency range that can be mechanically adjusted to a resonant frequency that blocks the propagation of a propagating high frequency signal is wide. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an exploded perspective view showing a variable resonator according to a first embodiment. [Figure 2] 2 is a plan view showing a first substrate in the variable resonator according to the first embodiment, as viewed from the front surface. FIG. [Figure 3] 4 is a planar perspective view seen from the front surface of a second substrate in the variable resonator according to the first embodiment. FIG. [Figure 4] 1 is a perspective view showing a variable resonator according to a first embodiment. [Figure 5] 1 is a plan view showing a variable resonator according to a first embodiment as viewed from the front side. [Figure 6] 1 is a right side perspective view showing a variable resonator according to a first embodiment. [Figure 7] 1 is a front perspective view showing a variable resonator according to a first embodiment. [Figure 8] FIG. 6 is a partial enlarged view of cross section II of FIG. 5. [Figure 9] FIG. 6 is a partially enlarged view of the II-II cross section of FIG. 5. [Figure 10] 3 is a circuit diagram showing an equivalent circuit of the variable resonator according to the first embodiment. FIG. [Figure 11] 3 is a circuit diagram showing an equivalent circuit of the variable resonator according to the first embodiment. FIG. [Figure 12] FIG. 10 is a perspective view showing a variable resonator according to a second embodiment. [Figure 13] FIG. 10 is a plan view showing a variable resonator according to a second embodiment as viewed from the front side. [Figure 14] 10 is a plan view showing a first substrate in a variable resonator according to a second embodiment, as viewed from the front surface. FIG. [Figure 15] 10 is a planar perspective view seen from the front surface of a second substrate in a variable resonator according to a second embodiment. FIG. [Figure 16] FIG. 10 is a circuit diagram showing an equivalent circuit according to a second embodiment. [Figure 17] 10 is a planar perspective view seen from the front surface showing another example 1 of the second substrate in the variable resonator according to the second embodiment. FIG. [Figure 18]10 is a planar perspective view seen from the front surface showing another example 2 of the second substrate in the variable resonator according to the second embodiment. FIG. [Figure 19] 10 is a planar perspective view seen from the front surface, showing another example 3 of the second substrate in the variable resonator according to the second embodiment. FIG. [Figure 20] FIG. 10 is an exploded perspective view showing a high-frequency variable filter circuit according to a third embodiment. [Figure 21] FIG. 11 is a perspective view showing a variable resonator according to a third embodiment. [Figure 22] 10 is a plan view showing the high-frequency variable filter circuit according to the third embodiment, as viewed from the front side. FIG. [Figure 23] 11 is a plan view showing a first substrate in a high-frequency variable filter circuit according to a third embodiment, as viewed from the front side. FIG. [Figure 24] 11 is a planar perspective view seen from the front side of a second substrate in a high-frequency variable filter circuit according to a third embodiment. FIG. [Figure 25] FIG. 23 is a partially enlarged view of the cross section III-III of FIG. 22. [Figure 26] FIG. 23 is a partially enlarged view of the IV-IV cross section of FIG. 22. [Figure 27] 23A and 23B are partial enlarged views showing the VV cross section and the VI-VI cross section of FIG. 22, respectively. [Figure 28] FIG. 11 is a circuit diagram showing an equivalent circuit of a variable resonator according to a third embodiment. [Figure 29] FIG. 11 is a circuit diagram showing an equivalent circuit of a variable resonator according to a third embodiment. [Figure 30] 10 is a circuit diagram showing an equivalent circuit representing the operation of the variable resonator according to the third embodiment at the frequency of the second harmonic (double wave) of the fundamental wave. FIG. [Figure 31] 10 is a circuit diagram showing an equivalent circuit representing the operation of the variable resonator according to the third embodiment at the frequency of the third harmonic (triple wave) of the fundamental wave. FIG. [Figure 32] FIG. 11 is a circuit diagram showing an equivalent circuit that represents the operation of the variable resonator according to the third embodiment in the vicinity of the cutoff frequency through which the fundamental wave passes. [Figure 33]FIG. 10 is a perspective view showing a high-frequency variable filter circuit according to a fourth embodiment. [Figure 34] 10 is a plan view showing a first substrate in a variable resonator according to a fourth embodiment, as viewed from the front surface. FIG. [Figure 35] 10 is a planar perspective view showing a second substrate in a variable resonator according to a fourth embodiment, as viewed from the front surface. FIG. [Figure 36] 13 is a planar perspective view seen from the front surface, showing another example 1 of the second substrate in the variable resonator according to the fourth embodiment. FIG. [Figure 37] 13 is a planar perspective view seen from the front surface, showing another example 2 of the second substrate in the variable resonator according to the fourth embodiment. FIG. [Figure 38] 13 is a planar perspective view seen from the front surface, showing another example 3 of the second substrate in the variable resonator according to the fourth embodiment. FIG. [Figure 39] FIG. 10 is a perspective view showing a high-frequency variable filter circuit according to a fifth embodiment. [Figure 40] FIG. 11 is a plan view showing a first substrate in a variable resonator according to a fifth embodiment, as viewed from the front surface. [Figure 41] 13 is a planar perspective view seen from the front surface of a second substrate in a variable resonator according to a fifth embodiment. FIG. [Figure 42] 13 is a planar perspective view seen from the front surface, showing another example 1 of the second substrate in the variable resonator according to the fifth embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Embodiment 1 The variable resonator according to the first embodiment will be described with reference to FIGS. The variable resonator according to the first embodiment is particularly used in high-frequency variable filter circuits used in communication devices in microwave and millimeter wave communication systems, for example, low-pass filters whose cutoff frequency can be mechanically adjusted. The variable resonator according to the first embodiment includes a first substrate 10, a second substrate 20, and a movable plate 30, as shown in FIGS.

[0010] The first substrate 10 is a microstrip substrate having microstrip lines that transmit high-frequency signals made up of electromagnetic waves. The first substrate 10 has a first dielectric substrate 11, a ground conductor (earth conductor) 12, a signal conductor pattern 13, and a stub conductor pattern 14. In the figure, for convenience, in a plane parallel to the surface of the first dielectric substrate 11, the direction perpendicular to the longitudinal direction of the signal conductor pattern 13 is defined as the X direction, the longitudinal direction of the signal conductor pattern 13 is defined as the Y direction, and the direction from the front to the back of the first dielectric substrate 11 is defined as the Z direction.

[0011] The ground conductor 12 is a conductive foil, such as a copper foil, formed on the rear surface of the flat first dielectric substrate 11, for example, on the entire rear surface in FIG. The signal conductor pattern 13 is a microstrip line formed on the surface of the first dielectric substrate 11, and constitutes a signal transmission line via the ground conductor 12 and the first dielectric substrate 11. The signal conductor pattern 13 is a linear conductor foil having a width W, such as a copper foil.

[0012] One end of the signal conductor pattern 13 is a first input / output terminal 13a, and the other end of the signal conductor pattern 13 is a second input / output terminal 13b. The input / output terminals are described as including terminals that function as both an input terminal and an output terminal for high frequency signals, and terminals in which one input / output terminal is an input terminal and the other input / output terminal is fixed to an output terminal.

[0013] In addition, the first input / output terminal 13a may refer to a first input / output terminal arranged on the surface of the first dielectric substrate 11 and electrically connected to one end of the signal conductor pattern 13, and the second input / output terminal 13b may refer to a second input / output terminal arranged on the surface of the first dielectric substrate 11 and electrically connected to the other end of the signal conductor pattern 13.

[0014] The stub conductor pattern 14 is composed of a first strip conductor pattern 14a and a second strip conductor pattern 14b. The first strip conductor pattern 14a is a strip line formed on the surface of the first dielectric substrate 11, and constitutes a first stub transmission line via the ground conductor 12 and the first dielectric substrate 11. The first strip conductor pattern 14a is a linear conductor foil, such as a copper foil, having a length L1.

[0015] One end of the first strip conductor pattern 14a is electrically connected to one side of the signal conductor pattern 13, and the other end of the first strip conductor pattern 14a is an open end. The first strip conductor pattern 14a and the signal conductor pattern 13 are integrally formed conductor foils, and one end of the first strip conductor pattern 14a and one side of the signal conductor pattern 13 are not physically separated, and the boundary surface between the first strip conductor pattern 14a and the signal conductor pattern 13 is referred to as one side of the signal conductor pattern 13.

[0016] The first strip conductor pattern 14 a is disposed on the surface of the first dielectric substrate 11 so as to be perpendicular to the signal conductor pattern 13 . The connection portion between one end of the first strip conductor pattern 14a and the side portion of the signal conductor pattern 13 is called a connection portion 13c.

[0017] The second strip conductor pattern 14b is a strip line formed on the surface of the first dielectric substrate 11, and constitutes a second stub transmission line via the ground conductor 12 and the first dielectric substrate 11. The second strip conductor pattern 14b is a linear conductor foil, such as a copper foil, having a length L2.

[0018] Both ends of the second strip conductor pattern 14b are open ends, and the open end located at one end of the second strip conductor pattern 14b is disposed at a distance S from the other end of the first strip conductor pattern 14a. The second strip conductor pattern 14b is disposed on an extension of the first strip conductor pattern 14a. That is, the first strip conductor pattern 14a and the second strip conductor pattern 14b are arranged on a straight line in the X direction on the surface of the first dielectric substrate 11 with a gap S therebetween, as shown in FIG.

[0019] The width W of the first strip conductor pattern 14a and the width W of the second strip conductor pattern 14b are the same. The width W of the first strip conductor pattern 14a and the width W of the second strip conductor pattern 14b are preferably the same as the width W of the signal conductor pattern 13, but may be different.

[0020] The second substrate 20 has a coupling adjustment conductor pattern for adjusting the coupling factor, which is the ratio of electromagnetic field coupling with the stub conductor pattern 14 on the first substrate 10, and is a coupling adjustment substrate that can be moved up and down relative to the first substrate 10. The second substrate 20 has a second dielectric substrate 21 and a third strip conductor pattern 22 .

[0021] The second substrate 20 is disposed opposite the first substrate 10 and is movable up and down relative to the first substrate 10 . A flat movable plate 30 is connected to the surface of the second substrate 20 . The movable plate 30 is attached to a movable mechanism (not shown) for moving the second substrate 20 in the front-to-back direction, and is movable (up and down) in the front-to-back direction of the second substrate 20 by the movable mechanism. The movable plate 30 is moved in the front-to-back direction (Z direction) of the second substrate 20 by the movable mechanism, and as a result, the distance between the front surface of the first substrate 10 and the back surface of the second substrate 20 is adjusted.

[0022] That is, the back surface of the flat second dielectric substrate 21 on the second substrate 20 and the front surface of the flat first dielectric substrate 11 on the first substrate 10 are arranged opposite each other, and the second substrate 20 is moved up and down based on the front surface of the first substrate 10. In addition, in embodiment 1, the second substrate 20 is moved up and down relative to the first substrate 10, but the first substrate 10 may also be moved up and down based on the back surface of the second substrate 20.

[0023] The point is that the second substrate 20 may be moved up and down relative to the first substrate 10. The moving mechanism is an actuator such as a voice coil motor or a moving coil actuator, and a plunger or the like in the actuator is connected to the moving plate 30 to move the moving plate 30 up and down.

[0024] When an actuator is used, the electrical origin can be easily obtained by setting the actuator free to drive, as the weight of the actuator will cause the distance d to become zero (d=0). The distance d is the distance between the surface of the conductor pattern arranged on the front surface of the first substrate 10 and the surface of the conductor pattern arranged on the back surface of the second substrate 20.

[0025] The third strip conductor pattern 22 is a conductor pattern for adjusting the degree of coupling k, which is the ratio of electromagnetic field coupling with the stub conductor pattern 14 on the first substrate 10 . The third strip conductor pattern 22 is disposed on the rear surface of the second dielectric substrate 21 so as to face the first strip conductor pattern 14a and the second strip conductor pattern 14b.

[0026] That is, the third strip conductor pattern 22 is located directly above the first strip conductor pattern 14a and the second strip conductor pattern 14b. The third strip conductor pattern 22 is a linear conductor foil, such as a copper foil, having a length L3.

[0027] As shown in FIG. 9, the length L3 of the third strip conductor pattern 22 is the sum of the length L1 of the first strip conductor pattern 14a, the length L2 of the second strip conductor pattern 14b, and the spacing S between the first strip conductor pattern 14a and the second strip conductor pattern 14b. As shown in FIG. 3, the width W of the third strip conductor pattern 22 is the same as the width W of the first strip conductor pattern 14a and the width W of the second strip conductor pattern 14b.

[0028] The third strip conductor pattern 22 is a strip conductor parallel to the first strip conductor pattern 14a and the second strip conductor pattern 14b, and forms a coupled line between the first strip conductor pattern 14a and the second strip conductor pattern 14b when there is a distance d (see Figures 8 and 9) between the first strip conductor pattern 14a and the second strip conductor pattern 14b where the electromagnetic field coupling ranges from tight coupling to loose coupling.

[0029] Tight coupling refers to the state of the coupled line formed by the third strip conductor pattern 22 and the first and second strip conductor patterns 14a and 14b at the moment when the distance d is approximately 0, that is, the moment when the third strip conductor pattern 22 is released from contact with the first and second strip conductor patterns 14a and 14b (d≒0), and the degree of coupling k, which is the ratio of electromagnetic field coupling, is ≒1.

[0030] Loose coupling refers to a state in which the distance d between the third strip conductor pattern 22 and the first and second strip conductor patterns 14a and 14b is sufficiently large, and the third strip conductor pattern 22 and the first and second strip conductor patterns 14a and 14b no longer form a coupled line, and the degree of coupling k, which is the ratio of electromagnetic field coupling, is approximately 0.

[0031] In short, the third strip conductor pattern 22 moves up and down within a range from a contact state with the first strip conductor pattern 14a and the second strip conductor pattern 14b (coupling degree k=1) to a state where it is sufficiently separated from them (coupling degree k=0) as the second substrate 20 moves up and down.

[0032] Next, the propagation wavelength and resonant frequency of a high-frequency signal through the stub transmission line formed by the third strip conductor pattern 22, the first strip conductor pattern 14a, and the second strip conductor pattern 14b will be described. When the third strip conductor pattern 22 is in contact with the first strip conductor pattern 14a and the second strip conductor pattern 14b, that is, when the distance d is 0 and the degree of coupling, which is the ratio of electromagnetic field coupling, k is 1, the third strip conductor pattern 22 is electrically conductive with the first strip conductor pattern 14a and the second strip conductor pattern 14b, which is electrically equivalent to a stub conductor pattern of length L3 being connected to the connection portion 13c of the signal conductor pattern 13.

[0033] Therefore, the propagation wavelength of a high-frequency signal propagating through the stub transmission line formed by the third strip conductor pattern 22, the first strip conductor pattern 14a, and the second strip conductor pattern 14b is determined by the thickness and dielectric constant of the first dielectric substrate 11, the thickness and dielectric constant of the second dielectric substrate 21, the widths and thicknesses of the third strip conductor pattern 22, the first strip conductor pattern 14a, and the second strip conductor pattern 14b, and the frequency.

[0034] Here, the length L3 of the third strip conductor pattern 22 is set to the first resonance frequency f 0L The length is set to 1 / 4 of the propagation wavelength at As a result, the stub transmission line formed by the third strip conductor pattern 22, the first strip conductor pattern 14a, and the second strip conductor pattern 14b has a first resonant frequency f 0L, the signal conductor pattern 13 functions as a quarter wavelength open stub with an electrically shorted point formed at the connection portion 13c. First resonant frequency f 0L is the lower limit frequency at which the propagation of a high frequency signal through the signal conductor pattern 13 is blocked.

[0035] Therefore, in the signal conductor pattern 13, the high frequency signal input from the first input / output terminal 13a has a first resonant frequency f 0L and the first resonant frequency f 0L High frequency signals at frequencies in the vicinity thereof including 1 / 4 wavelength are attenuated by the 1 / 4 wavelength open-ended stub and are prevented from passing to the second input / output terminal 13b.

[0036] When the distance d between the third strip conductor pattern 22 and the first and second strip conductor patterns 14a and 14b is sufficiently large and the degree of coupling k, which is the ratio of electromagnetic field coupling, is 0, the first and second strip conductor patterns 14a and 14b are not affected by the third strip conductor pattern 22, and therefore this is electrically equivalent to the first strip conductor pattern 14a of length L1 being connected to the connection portion 13c in the signal conductor pattern 13 as a stub conductor pattern.

[0037] Therefore, the propagation wavelength of a high-frequency signal propagating through the stub transmission line formed by the first strip conductor pattern 14a is determined by the thickness and dielectric constant of the first dielectric substrate 11, the width and thickness of the first strip conductor pattern 14a, and the frequency. Here, the length L1 of the first strip conductor pattern 14a is set to the second resonant frequency f 0H The length is set to 1 / 4 of the propagation wavelength at

[0038] As a result, the stub transmission line formed by the first strip conductor pattern 14a has a second resonant frequency f 0H , the signal conductor pattern 13 functions as a quarter wavelength open stub with an electrically shorted point formed at the connection portion 13c. The second resonance frequency f 0H is the upper limit frequency that blocks the propagation of the high-frequency signals propagating in the signal conductor pattern 13.

[0039] The second resonance frequency f 0H is the frequency (f 0L = 2×f 0H ) that is twice the first resonance frequency f 0L . The length L3 of the third strip conductor pattern 22 is set to be about twice the length L1 of the first strip conductor pattern 14a (L3 ≒ 2×L1). The length L2 of the second strip conductor pattern 14b is set to be the length obtained by subtracting the sum of the length L3 of the third strip conductor pattern 22 and the length L1 of the first strip conductor pattern 14a from the distance S between the other end of the first strip conductor pattern 14a and one end of the second strip conductor pattern 14b (L2 ≒ L3 - L1 - S).

[0040] When the distance d between the third strip conductor pattern 22 and the first strip conductor pattern 14a and the second strip conductor pattern 14b is such that the coupling degree k, which is the ratio of electromagnetic field coupling, exceeds 0 and is less than 1 (0 < k < 1), a first coupling line 22a is formed between the third strip conductor pattern 22 and the first strip conductor pattern 14a, and a second coupling line 22b is formed between the third strip conductor pattern 22 and the second strip conductor pattern 14b.

[0041] That is, the stub transmission line connected to the connection portion 13c in the signal conductor pattern 13 is electrically equivalent to a circuit in which one end of the first coupling line 22a is connected to the connection portion 13c in the signal conductor pattern 13 and the other end of the first coupling line 22a is longitudinally connected to one end of the second coupling line 22b, as shown in FIG. 10.

[0042] The third resonance frequency f 0mThen, as the distance in the Z direction increases from the contact state between the third strip conductor pattern 22 and the first and second strip conductor patterns 14a and 14b, that is, as the distance d increases, the degree of coupling k decreases from 1. Therefore, the third resonant frequency f 0m is the first resonant frequency f 0L The frequency is shifted to a higher frequency side than the reference frequency, and an electrical short-circuit point is always formed at the connection portion 13c of the signal conductor pattern 13. When the distance d is further increased and the coupling factor k approaches 0, the third resonance frequency f 0m is the second resonant frequency f 0H is shifted to asymptotically

[0043] As a result, the stub transmission line formed by the first coupled line 22a and the second coupled line 22b has a third resonant frequency f 0m , the signal conductor pattern 13 functions as a quarter wavelength open stub with an electrically shorted point formed at the connection portion 13c.

[0044] Therefore, in the signal conductor pattern 13, the high frequency signal input from the first input / output terminal 13a has a third resonant frequency f 0m and the third resonant frequency f 0m High frequency signals at frequencies in the vicinity thereof including 1 / 4 wavelength are attenuated by the 1 / 4 wavelength open-ended stub and are prevented from passing to the second input / output terminal 13b.

[0045] In the first embodiment, the first resonant frequency f 0L and the second resonant frequency f 0H and the third resonant frequency f 0m The relationship between 0L <f 0m <f 0H and f 0H =2×f 0L is set to. Therefore, the first resonant frequency f 0L and the second resonant frequency f 0H and the third resonant frequency f 0m and the coupling degree k, the following equation (1) holds.

[0046] TIFF0007749884000001.tif15166

[0047] In the above formula (1), when the coupling degree k = 1 representing the state where the distance d = 0, the third resonance frequency f 0m is the first resonance frequency f 0L and coincides (f 0m = f 0L ). Also, in the above formula (1), when the coupling degree k = 0 representing the state where the distance d is sufficiently large, the third resonance frequency f 0m is the second resonance frequency f 0H and coincides (f 0m = f 0H ). Furthermore, in the above formula (1), when the coupling degree k representing the state where the distance d exceeds 0 satisfies 0 < k < 1, the third resonance frequency f 0m is the frequency between the first resonance frequency f<00000第41号and the second resonance frequency f 0H .

[0048] From the above, in Embodiment 1, as shown in FIG. 11, the stub transmission line 15 having an equivalent length L m (L1 ≦ L m ≦ L3) connected to the connection portion 13c in the signal conductor pattern 13 is electrically equivalent. [[ID=4A]]The stub transmission line 15 having a length L m operates as a 1 / 4 wavelength tip open stub in which an electrical short - circuit point is formed at the connection portion 13c in the signal conductor pattern 13 at a frequency between the first resonance frequency f 0L selected according to the selected length L m and the second resonance frequency f 0H , that is, at a frequency (f 0L or higher and f 0H (= 2 × f 0L ) or lower).

[0049] It should be noted that there seems to be an error in the original text where "第41号" is used. It is assumed to be a typo and should be something like " 0L ". This translation is based on the best understanding of the overall context with this assumption.That is, by moving the second substrate 20 up and down with respect to the surface of the first substrate 10, the first strip conductor pattern 14a, the second strip conductor pattern 14b, and the third strip conductor pattern 22 generate a first resonance frequency f 0L to the second resonant frequency f 0H The resonant frequency can be changed within the range of , and the stub can be operated as a quarter wavelength open stub at a frequency according to the selected distance d.

[0050] Therefore, in the signal conductor pattern 13, the high frequency signal input from the first input / output terminal 13a has a first resonant frequency f 0L to the second resonant frequency f 0H High frequency signals at the resonant frequency selected from the range and frequencies in the vicinity of the selected resonant frequency are attenuated by the quarter wavelength open stub and are prevented from passing to the second input / output terminal 13b.

[0051] Next, a description will be given of how to set frequencies that are blocked from passing among high-frequency signals propagated through the signal conductor pattern 13 in the variable resonator according to the first embodiment. First, the movable mechanism is operated to bring the third strip conductor pattern 22 into contact with the first strip conductor pattern 14a and the second strip conductor pattern 14b, thereby obtaining the electrical origin.

[0052] When an actuator such as a voice coil motor or a moving coil actuator is used as the moving mechanism, the actuator is set free to drive and its own weight exerts a downward force on the moving plate 30, causing the third strip conductor pattern 22 to contact the first strip conductor pattern 14a and the second strip conductor pattern 14b.

[0053] Next, the moving mechanism is driven to gradually move the moving plate 30 upward, and the distance d between the third strip conductor pattern 22 and the first and second strip conductor patterns 14a and 14b is gradually increased from 0. As the distance d gradually increases from 0, the degree of coupling k between the first coupled line 22a and the second coupled line 22b gradually decreases from 1.

[0054] As the degree of coupling k gradually decreases from 1, the resonant frequency of the quarter-wave open-circuit stub formed by the first strip conductor pattern 14a, the second strip conductor pattern 14b, and the third strip conductor pattern 22, in which an electrical short-circuit point is formed at the connection portion 13c of the signal conductor pattern 13, decreases to the first resonant frequency f 0L gradually increases from

[0055] When the resonance frequency of the quarter wavelength open-end stub reaches the set frequency, the driving of the moving mechanism is stopped, the upward movement of the moving plate 30 is stopped, and the distance d is fixed. As a result, a resonator is obtained in which the propagation of the resonant frequency of the selected 1 / 4 wavelength open stub and frequencies in the vicinity of the resonant frequency, among the high frequency signals propagating through the signal conductor pattern 13, is blocked.

[0056] The resonant frequency of the 1 / 4 wavelength open stub is the first resonant frequency f 0L to the maximum, second resonant frequency f 0H can be obtained up to. Therefore, among the high frequency signals propagating through the signal conductor pattern 13, the first resonant frequency f 0L to the second resonant frequency f 0H (=2×f 0L ) can be set over a wide range.

[0057] As described above, the variable resonator according to the first embodiment comprises a first substrate 10 having, on the front surface of a first dielectric substrate 11, the signal conductor pattern 13, the first strip conductor pattern 14a electrically connected at one end to the signal conductor pattern 13, and the second strip conductor pattern 14b spaced apart from the other end of the first strip conductor pattern 14a, and a second dielectric substrate 21 having, on the rear surface thereof, the third strip conductor pattern 22 facing the first strip conductor pattern 14a and the second strip conductor pattern 14b. The first substrate 10 includes a second substrate 20 connected to the surface of the second substrate 20, a movable plate connected to the surface of the second substrate 20, movable in the front-to-back direction of the second substrate 20, and used to adjust the distance between the surface of the first substrate 10 and the back surface of the second substrate 20. By moving the second substrate 20 up and down based on the surface of the first substrate 10, the degree of coupling k, which is the ratio of electromagnetic field coupling between the first strip conductor pattern 14a and the second strip conductor pattern 14b and the third strip conductor pattern 22, can be changed from 1 to 0, and the first resonance frequency f when the degree of coupling k is 1 can be changed. 0L The second resonance frequency f when the coupling factor k is 0 is 0H The frequency at which the propagation of the high frequency signal propagating through the signal conductor pattern 13 is blocked can be set over a wide range.

[0058] Embodiment 2 The variable resonator according to the second embodiment will be described with reference to FIGS. The variable resonator of embodiment 2 differs from the variable resonator of embodiment 1 in that a second stub conductor pattern 16 that is mirror-symmetric to the stub conductor pattern 14 with respect to the central axis of the longitudinal direction (Y direction) of the signal conductor pattern 13 is additionally arranged on the front surface of the first dielectric substrate 11, and a sixth strip conductor pattern 23 that is a second coupling degree adjustment conductor pattern for adjusting the coupling degree, which is the ratio of electromagnetic field coupling with the second stub conductor pattern 16, is additionally arranged on the back surface of the second dielectric substrate 21, but is otherwise the same. 12 to 16, the same reference numerals as those in FIGS. 1 to 11 designate the same or corresponding parts.

[0059] The following description will focus on the second stub conductor pattern 16 and the second coupling adjustment conductor pattern 23, which are differences from the variable resonator according to the first embodiment. The variable resonator according to the second embodiment includes a first substrate 10, a second substrate 20, and a movable plate 30. The first substrate 10 has a dielectric substrate 11, a ground conductor 12, a signal conductor pattern 13, a first stub conductor pattern 14, and a second stub conductor pattern 16. The second substrate 20 has a second dielectric substrate 21, a third strip conductor pattern 22 which is a first coupling adjustment conductor pattern, and a sixth strip conductor pattern 23 which is a second coupling adjustment conductor pattern.

[0060] The first dielectric substrate 11, the ground conductor 12, the signal conductor pattern 13, and the first stub conductor pattern 14 are the same as the first dielectric substrate 11, the ground conductor 12, the signal conductor pattern 13, and the first stub conductor pattern 14 in the variable resonator according to embodiment 1, and therefore will not be described here. Moreover, the second dielectric substrate 21 and the third strip conductor pattern 22 are the same as the second dielectric substrate 21 and the third strip conductor pattern 22 in the variable resonator according to the first embodiment, and therefore a description thereof will be omitted.

[0061] However, in the second embodiment, the width W1 of the first strip conductor pattern 14a and the width W1 of the second strip conductor pattern 14b constituting the first stub conductor pattern 14 are narrower than the width W of the signal conductor pattern 13 in the variable resonator according to the first embodiment and the width W of the first strip conductor pattern 14a and the width W of the second strip conductor pattern 14b constituting the first stub conductor pattern 14.

[0062] Therefore, in embodiment 2, the area occupied by the connection portion 13c, which is the connection point between one end of the first strip conductor pattern 14a and one side surface of the signal conductor pattern 13, can be reduced, and the effect of the area occupied by the connection portion 13c on the pass characteristics (frequency characteristics) of high-frequency signals propagating through the signal conductor pattern 13 is reduced.

[0063] Furthermore, the width W1 of the third strip conductor pattern 22 is narrower than the width W of the third strip conductor pattern 22 in the variable resonator according to the first embodiment. The width W1 of the first strip conductor pattern 14a, the second strip conductor pattern 14b, and the third strip conductor pattern 22 is narrow, and the coupling lines between the first strip conductor pattern 14a, the second strip conductor pattern 14b, and the third strip conductor pattern 22 have high characteristic impedance.

[0064] The second stub conductor pattern 16 on the first substrate 10 is arranged on the surface of the first dielectric substrate 11 at a position mirror-symmetrical to the first stub conductor pattern 14 with respect to the central axis of the signal conductor pattern 13 in the longitudinal direction (Y direction). The second stub conductor pattern 16 is composed of a fourth strip conductor pattern 16a and a fifth strip conductor pattern 16b.

[0065] The fourth strip conductor pattern 16a is a strip line formed on the surface of the first dielectric substrate 11, and constitutes a third stub transmission line via the ground conductor 12 and the first dielectric substrate 11. The fourth strip conductor pattern 16a is a linear conductor foil, such as a copper foil, having a length L1.

[0066] One end of the fourth strip conductor pattern 16a is electrically connected to the other side of the signal conductor pattern 13, and the other end of the fourth strip conductor pattern 16a is an open end. The fourth strip conductor pattern 16a and the signal conductor pattern 13 are integrally formed conductor foils, and one end of the fourth strip conductor pattern 16a and the other side of the signal conductor pattern 13 are not physically separated, and the boundary surface between the fourth strip conductor pattern 16a and the signal conductor pattern 13 is referred to as the other side of the signal conductor pattern 13.

[0067] The fourth strip conductor pattern 16a is orthogonal to the signal conductor pattern 13 and is arranged on the surface of the first dielectric substrate 11 on an extension of the first strip conductor pattern 14a. The connection portion between one end of the fourth strip conductor pattern 16a and the other side surface of the signal conductor pattern 13 is called a connection portion 13d.

[0068] The fifth strip conductor pattern 16b is a strip line formed on the surface of the first dielectric substrate 11, and constitutes a fourth stub transmission line via the ground conductor 12 and the first dielectric substrate 11. The fifth strip conductor pattern 16b is a linear conductor foil, such as a copper foil, having a length L2.

[0069] Both ends of the fifth strip conductor pattern 16b are open ends, and the open end located at one end of the fifth strip conductor pattern 16b is disposed at a distance S from the other end of the fourth strip conductor pattern 16a. The fifth strip conductor pattern 16b is disposed on an extension of the fourth strip conductor pattern 16a.

[0070] That is, the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b are arranged on a straight line in the X direction with a gap S therebetween on the surface of the first dielectric substrate 11, as shown in FIG. The fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b are arranged in mirror symmetry with respect to the central axis of the signal conductor pattern 13 in the longitudinal direction, via the first strip conductor pattern 14a, the second strip conductor pattern 14b and the signal conductor pattern 13.

[0071] The width W1 of the fourth strip conductor pattern 16a and the width W1 of the fifth strip conductor pattern 16b are the same as the width W1 of the first strip conductor pattern 14a and the width W1 of the second strip conductor pattern 14b, and are narrower than the width W of the signal conductor pattern 13. Therefore, the area occupied by the connection portion 13d, which is the connection point between one end of the fourth strip conductor pattern 16a and the other side portion of the signal conductor pattern 13, can be reduced, and the influence of the area occupied by the connection portion 13d on the pass characteristics (frequency characteristics) for high-frequency signals propagating through the signal conductor pattern 13 is reduced.

[0072] The sixth strip conductor pattern 23 of the second substrate 20 is disposed on the rear surface of the second dielectric substrate 21 so as to face the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b. That is, the sixth strip conductor pattern 23 is located directly above the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b.

[0073] As shown in FIG. 15, the sixth strip conductor pattern 23 is arranged at a position that is mirror-symmetrical to the third strip conductor pattern 22 with respect to the central axis of the signal conductor pattern 13 in the longitudinal direction. The sixth strip conductor pattern 23 is arranged on an extension of the third strip conductor pattern 22 at an interval equal to the width W of the signal conductor pattern 13 . That is, the third strip conductor pattern 22 and the sixth strip conductor pattern 23 are arranged on a straight line in the Y direction with a gap W therebetween. The sixth strip conductor pattern 23 is a linear conductor foil, such as a copper foil, having a length L3.

[0074] The length L3 of the sixth strip conductor pattern 23 is the sum of the length L1 of the fourth strip conductor pattern 16a, the length L2 of the fifth strip conductor pattern 16b, and the spacing S between the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b. The width W1 of the sixth strip conductor pattern 23 is the same as the width W1 of the third strip conductor pattern 22, the width W1 of the fourth strip conductor pattern 16a, and the width W1 of the fifth strip conductor pattern 16b.

[0075] The sixth strip conductor pattern 23 is a strip conductor parallel to the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b, and forms a coupling line between the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b when there is a distance d between the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b and the electromagnetic field coupling ranges from tight coupling to loose coupling.

[0076] The width W1 of the fourth strip conductor pattern 16a, the fifth strip conductor pattern 16b, and the sixth strip conductor pattern 23 is narrow, and the coupling lines between the fourth strip conductor pattern 16a, the fifth strip conductor pattern 16b, and the sixth strip conductor pattern 23 have high characteristic impedance.

[0077] Like the third strip conductor pattern 22, the sixth strip conductor pattern 23 is moved up and down within a range from a contact state with the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b (coupling degree k=1) to a state sufficiently separated (coupling degree k=0) by moving the second substrate 20 up and down.

[0078] When the second substrate 20 is moved up and down relative to the surface of the first substrate 10, the propagation wavelength and resonant frequency of the high-frequency signal through the stub transmission line formed by the sixth strip conductor pattern 23, the fourth strip conductor pattern 16a, and the fifth strip conductor pattern 16b are the same as the resonant frequency of the high-frequency signal through the stub transmission line formed by the third strip conductor pattern 22, the first strip conductor pattern 14a, and the second strip conductor pattern 14b.

[0079] That is, when the sixth strip conductor pattern 23 is in contact with the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b (coupling degree k=1), the stub transmission line formed by the sixth strip conductor pattern 23 and the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b has a first resonance frequency f0L In 0L , it operates as a 1 / 4 wavelength tip open stub in which an electrical short circuit point is formed at the connection part 13d in the signal conductor pattern 13.

[0080] When the coupling degree k between the sixth strip conductor pattern 23, the fourth strip conductor pattern 16a, and the fifth strip conductor pattern 16b is k = 0, the stub transmission line formed by the fourth strip conductor pattern 16a has a second resonance frequency f 0H In 0H , it operates as a 1 / 4 wavelength tip open stub in which an electrical short circuit point is formed at the connection part 13d in the signal conductor pattern 13.

[0081] When the coupling degree k between the sixth strip conductor pattern 23, the fourth strip conductor pattern 16a, and the fifth strip conductor pattern 16b exceeds 0 and is less than 1 (0 < k < 1), a third coupling line is formed between the sixth strip conductor pattern 23 and the fourth strip conductor pattern 16a, and a fourth coupling line is formed between the sixth strip conductor pattern 23 and the fifth strip conductor pattern 16b.

[0082] The stub transmission line formed by the third coupling line and the fourth coupling line has a third resonance frequency f 0m In 0m , it operates as a 1 / 4 wavelength tip open stub in which an electrical short circuit point is formed at the connection part 13d in the signal conductor pattern 13.

[0083] From the above, in Embodiment 2, as shown in FIG. 16, an equivalent length L m (L1 ≤ L m ≤ L3) of the stub transmission line 15 is connected to the connection part 13c in the signal conductor pattern 13, and an equivalent length L m (L1 ≤ L m ≤ L3) of the stub transmission line 17 is connected to the connection part 13d in the signal conductor pattern 13, which is electrically equivalent.

[0084] That is, the resonant frequency of the stub transmission line 15 is electrically equivalent to a parallel connection of a quarter wavelength open stub and a quarter wavelength open stub, and the resonant frequency of the stub transmission line 17 is changed depending on the distance d. m , i.e. the first resonant frequency f depending on the selected distance d 0L to the second resonant frequency f 0H The frequency (f 0L more than f 0H (=2×f 0L ) or lower), the signal conductor pattern 13 functions as a quarter-wave open stub with an electrical short-circuit point formed at the connection portions 13c and 13d.

[0085] In short, the variable resonator according to the second embodiment is a variable resonator in which two variable resonator sections are connected in parallel to the signal conductor pattern 13: variable resonator section A having the first stub conductor pattern 14 and the third strip conductor pattern 22, which is a conductor pattern for adjusting the coupling degree, and variable resonator section B having the second stub conductor pattern 16 and the sixth strip conductor pattern 23, which is a conductor pattern for adjusting the coupling degree. Variable resonance portion A and variable resonance portion B block high frequency signals of the same frequency from passing through the signal conductor pattern 13 .

[0086] In the variable resonator according to the second embodiment, the width W1 of each of the first strip conductor pattern 14a, the second strip conductor pattern 14b, and the third strip conductor pattern 22, and the width W1 of each of the fourth strip conductor pattern 16a, the fifth strip conductor pattern 16b, and the sixth strip conductor pattern 23 can be narrowed, thereby increasing the impedance from the first coupled line to the fourth coupled line and reducing the influence on the pass characteristics (frequency characteristics) of the area occupied by the connection portion 13c and the connection portion 13d in the signal conductor pattern 13.

[0087] The variable resonator according to the second embodiment has the same effects as the variable resonator according to the first embodiment, and in addition, the influence on the pass characteristics (frequency characteristics) of high frequency signals propagating through the signal conductor pattern 13 is reduced. As a result, the variable resonator according to the second embodiment is suitable for use in the millimeter wave band where the propagation wavelength is short.

[0088] Another example 1 of the second substrate 20 in the variable resonator according to the second embodiment The third strip conductor pattern 22 and the sixth strip conductor pattern 23 on the second substrate 20 may not be arranged in a straight line with a gap W therebetween, but may be formed continuously to fill the gap W, as shown in Figure 17. That is, the third strip conductor pattern 22 of length L3 and the sixth strip conductor pattern 23 of length L3, which are arranged at positions mirror-symmetrical with respect to the longitudinal central axis of the signal conductor pattern 13, are formed continuously in a straight line in the Y direction on the rear surface of the second dielectric substrate 21 as a single strip conductor pattern of length (2×L3+W).

[0089] Another example 2 of the second substrate 20 in the variable resonator according to the second embodiment As shown in FIG. 18, the length of each of the third strip conductor pattern 22 and the sixth strip conductor pattern 23 on the second substrate 20 may be a length L3' (=L3-ΔL) that is shorter than the length L3 by ΔL. The length L3' of the third strip conductor pattern 22 is longer than the sum of the length L1 of the first strip conductor pattern 14a and the spacing S between the first strip conductor pattern 14a and the second strip conductor pattern 14b, and is shorter than the sum of the length L1 of the first strip conductor pattern 14a, the length L2 of the second strip conductor pattern 14b, and the spacing S between the first strip conductor pattern 14a and the second strip conductor pattern 14b.

[0090] That is, when the distance d is 0, the length L3' of the third strip conductor pattern 22 electrically connects the third strip conductor pattern 22 to the first strip conductor pattern 14a and the second strip conductor pattern 14b. When the distance d exceeds 0, the length of the third strip conductor pattern 22 forms a first coupling line 22a between the third strip conductor pattern 22 and the first strip conductor pattern 14a and forms a first coupling line 22a between the third strip conductor pattern 22 and the second strip conductor pattern 14b.

[0091] The length L3' of the sixth strip conductor pattern 23 is longer than the sum of the length L1 of the fourth strip conductor pattern 16a and the interval S between the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b, and is shorter than the sum of the length L1 of the fourth strip conductor pattern 16a, the length L2 of the fifth strip conductor pattern 16b, and the interval S between the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b.

[0092] That is, when the distance d is 0, the length L3' of the sixth strip conductor pattern 23 electrically connects the sixth strip conductor pattern 23 to the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b. When the distance d exceeds 0, the length of the sixth strip conductor pattern 23 forms a first coupling line 22a between the sixth strip conductor pattern 23 and the fourth strip conductor pattern 16a and forms a first coupling line 22a between the sixth strip conductor pattern 23 and the fifth strip conductor pattern 16b.

[0093] That is, L3' satisfies the relationship (L1 + S) < L3' < (L1 + L2 + S = L3). Also, ΔL is in a range sufficiently shorter than the propagation wavelength of the fundamental wave in the high-frequency signal, for example, λ / 10 or less. Also, ΔL may exceed the maximum allowable range of the longitudinal (X-direction) displacement of the third strip conductor pattern 22 and the sixth strip conductor pattern 23 of the second substrate 20 with respect to the first strip conductor pattern 14a and the fourth strip conductor pattern 16a of the first substrate 10. By setting ΔL in this way, the frequency characteristics of the variable resonator are not affected.

[0094] Another example 3 of the second substrate 20 in the variable resonator according to the second embodiment The third strip conductor pattern 22 and the sixth strip conductor pattern 23 on the second substrate 20 may not be configured to be arranged in a straight line with a gap W therebetween, but may be formed continuously to fill the gap W as shown in Figure 19, and the lengths of the third strip conductor pattern 22 and the sixth strip conductor pattern 23 may each be a length L3' (= L3 - ΔL) that is shorter than the length L3 by ΔL.

[0095] That is, the third strip conductor pattern 22 of length L3' (= L3 - ΔL) and the sixth strip conductor pattern 23 of length L3' (= L3 - ΔL), which are arranged at positions mirror-symmetrical with respect to the longitudinal central axis of the signal conductor pattern 13, are formed continuously in a straight line in the Y direction on the back surface of the second dielectric substrate 21 as a single strip conductor pattern of length (2 × L3' (= L3 - ΔL) + W).

[0096] Embodiment 3 A high-frequency variable filter circuit according to the third embodiment will be described with reference to FIGS. The high-frequency variable filter circuit of embodiment 3 comprises a first variable resonator that blocks the passage of a second harmonic (second harmonic: frequency f2=2×f1) of a fundamental wave (frequency f1) of a high-frequency signal propagating through the signal conductor pattern 13A, and a second variable resonator and a third variable resonator that block the passage of a third harmonic (third harmonic: frequency f3=3×f1).

[0097] The high-frequency variable filter circuit according to the third embodiment is a high-frequency variable filter circuit used particularly in communication equipment in microwave and millimeter wave communication systems, for example, a low-pass filter in which the cutoff frequency and the harmonics to be blocked can be mechanically adjusted. The high-frequency variable filter circuit according to the third embodiment is a low-pass filter configured by combining a series inductor and a capacitor.

[0098] The high-frequency variable filter circuit according to the third embodiment has a lower limit frequency f 1L to the upper frequency f 1H The fundamental frequency can be adjusted up to As a result, the high-frequency variable filter circuit according to the third embodiment has a lower limit frequency f 2L to the upper frequency f 2H The frequency of the second harmonic can be adjusted up to the lower limit of the frequency f3 of the third harmonic. 3L to the upper frequency f 3H The frequency of the triple wave can be adjusted up to

[0099] In addition, in the fundamental wave f1, the upper limit frequency f 1H is the lower limit fundamental frequency f 1L Set the frequency to twice the frequency of the As a result, at the frequency f2 of the double wave, the upper frequency f 2H is the lower limit frequency f 2L The frequency is twice that of the triple wave, f3, and the upper limit of the frequency f 3H is the lower limit frequency f 3L It is twice the frequency of 20 to 32, the same reference numerals as those in FIGS. 1 to 11 indicate the same or corresponding parts.

[0100] The high-frequency variable filter circuit according to the third embodiment includes a first substrate 10, a second substrate 20, and a movable plate 30, as shown in FIGS. The first substrate 10 is a microstrip substrate that has a microstrip line that transmits a high-frequency signal made up of electromagnetic waves and that constitutes a high-frequency filter circuit. The first substrate 10 has a first dielectric substrate 11, a ground conductor (earth conductor) 12, a signal conductor pattern 13A, a first stub conductor pattern 14A, a third stub conductor pattern 14B, and a fourth stub conductor pattern 14C.

[0101] The first stub conductor pattern 14A functions to set the cutoff frequency in the low-pass filter and to set the resonance frequency for blocking the second harmonic. The third stub conductor pattern 14B and the fourth stub conductor pattern 14C function to set the cutoff frequency in the low-pass filter and to set the resonance frequency for blocking the third harmonic, respectively.

[0102] The ground conductor 12 is a conductive foil, such as a copper foil, formed on the rear surface of the flat first dielectric substrate 11, for example, on the entire rear surface in FIG. The signal conductor pattern 13A is a microstrip line formed on the surface of the first dielectric substrate 11, and constitutes a signal transmission line via the ground conductor 12 and the first dielectric substrate 11.

[0103] The signal conductor pattern 13A has a first input / output line portion 13A1, a first connecting line portion 13A3, a second connecting line portion 13A4, and a second input / output line portion 13A2, which are linear conductor foils, such as copper foils, connected in sequence from the first input / output terminal 13a to the second input / output terminal 13b. The width W2 of each of the first connection line portion 13A3 and the second connection line portion 13A4 is narrower than the width W of each of the first input / output line portion 13A1 and the second input / output line portion 13A2. The first connection line portion 13A3 and the second connection line portion 13A4 have the same length. 、 As shown in Figure 23, L t Let's say. Each of the first connection line portion 13A3 and the second connection line portion 13A4 functions as an inductor.

[0104] The first stub conductor pattern 14A is composed of a first strip conductor pattern 14a and a second strip conductor pattern 14b. Between the first stub conductor pattern 14A and the ground conductor 12, the first stub conductor pattern 14A functions as a first capacitor for the fundamental wave of the high-frequency signal propagating through the signal conductor pattern 13A, and functions as a 1 / 4 wavelength open-end stub for the double wave of the fundamental wave.

[0105] The first strip conductor pattern 14a is a strip line formed on the surface of the first dielectric substrate 11, and constitutes a first stub transmission line via the ground conductor 12 and the first dielectric substrate 11. The first strip conductor pattern 14a is a linear conductor foil, such as a copper foil, having a length L1.

[0106] One end of the first strip conductor pattern 14a is electrically connected to one side of the junction between the other end of the first connecting line portion 13A3 of the signal conductor pattern 13A and one end of the second connecting line portion 13A4, and the other end of the first strip conductor pattern 14a is an open end. The first strip conductor pattern 14a and the first and second connecting line portions 13A3 and 13A4 of the signal conductor pattern 13A are integrally formed conductor foils, and one end of the first strip conductor pattern 14a and one side surface at the junction between the first connecting line portion 13A3 and the second connecting line portion 13A4 are not physically separated, but the boundary surface at the junction between the first strip conductor pattern 14a and the first connecting line portion 13A3 and the second connecting line portion 13A4 is referred to as one side surface of the junction.

[0107] The first strip conductor pattern 14a is disposed on the surface of the first dielectric substrate 11, perpendicular to the first connection line portion 13A3 and the second connection line portion 13A4. The connection portion between one end of the first strip conductor pattern 14a and one side of the junction between the first connection line portion 13A3 and the second connection line portion 13A4 is referred to as a connection portion 13c.

[0108] The second strip conductor pattern 14b is a strip line formed on the surface of the first dielectric substrate 11, and constitutes a second stub transmission line via the ground conductor 12 and the first dielectric substrate 11. The second strip conductor pattern 14b is a linear conductor foil, such as a copper foil, having a length L2.

[0109] Both ends of the second strip conductor pattern 14b are open ends, and the open end located at one end of the second strip conductor pattern 14b is disposed at a distance S from the other end of the first strip conductor pattern 14a. The second strip conductor pattern 14b is disposed on an extension of the first strip conductor pattern 14a. That is, the first strip conductor pattern 14a and the second strip conductor pattern 14b are arranged on a straight line in the X direction on the surface of the first dielectric substrate 11 with a gap S therebetween, as shown in FIG.

[0110] The width W of the first strip conductor pattern 14a and the width W of the second strip conductor pattern 14b are the same. The width W of the first strip conductor pattern 14a and the width W of the second strip conductor pattern 14b are preferably the same as the width W of the first input / output line portion 13A1 and the second input / output line portion 13A2 of the signal conductor pattern 13A, but may be different.

[0111] The third stub conductor pattern 14B is composed of a seventh strip conductor pattern 14c and an eighth strip conductor pattern 14d. Between the third stub conductor pattern 14B and the ground conductor 12, it functions as a second capacitor for the fundamental wave of the high-frequency signal propagating through the signal conductor pattern 13A, and functions as a 1 / 4 wavelength open-end stub for the third harmonic of the fundamental wave.

[0112] The seventh strip conductor pattern 14c is a strip line formed on the surface of the first dielectric substrate 11, and constitutes a fifth stub transmission line via the ground conductor 12 and the first dielectric substrate 11. The seventh strip conductor pattern 14c is a linear conductor foil, such as a copper foil, having a length L4. The length L4 of the seventh strip conductor pattern 14c is 2 / 3 of the length L1 of the first strip conductor pattern 14a.

[0113] One end of the seventh strip conductor pattern 14c is electrically connected to one side surface at one end of the first connection line portion 13A3 of the signal conductor pattern 13A, and the other end of the seventh strip conductor pattern 14c is an open end. The seventh strip conductor pattern 14c and the first connecting line portion 13A3 of the signal conductor pattern 13A are integrally formed conductor foils, and one end of the seventh strip conductor pattern 14c and one side surface at one end of the first connecting line portion 13A3 are not physically separated, but the boundary surface between the seventh strip conductor pattern 14c and one side surface of the first connecting line portion 13A3 is referred to as one side surface.

[0114] The seventh strip conductor pattern 14c is disposed on the surface of the first dielectric substrate 11, perpendicular to the first connection line portion 13A3. The connection portion between one end of the seventh strip conductor pattern 14c and one side of the first connection line portion 13A3 is referred to as a connection portion 13e.

[0115] The eighth strip conductor pattern 14d is a strip line formed on the surface of the first dielectric substrate 11, and constitutes a sixth stub transmission line via the ground conductor 12 and the first dielectric substrate 11. The eighth strip conductor pattern 14d is a linear conductor foil, such as a copper foil, having a length L5. The length L5 of the eighth strip conductor pattern 14d is 2 / 3 of the length L2 of the second strip conductor pattern 14b.

[0116] The eighth strip conductor pattern 14d has open ends at both ends, and the open end located at one end of the eighth strip conductor pattern 14d is disposed at a distance S from the other end of the seventh strip conductor pattern 14c. The eighth strip conductor pattern 14d is disposed on an extension of the seventh strip conductor pattern 14c. That is, the seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d are arranged on a straight line in the X direction on the surface of the first dielectric substrate 11 with a gap S therebetween, as shown in FIG.

[0117] The width W of the seventh strip conductor pattern 14c and the width W of the eighth strip conductor pattern 14d are the same. The width W of the seventh strip conductor pattern 14c and the width W of the eighth strip conductor pattern 14d are preferably the same as the width W of the first input / output line portion 13A1 and the second input / output line portion 13A2 of the signal conductor pattern 13A, but may be different.

[0118] The fourth stub conductor pattern 14C is composed of a tenth strip conductor pattern 14e and an eleventh strip conductor pattern 14f. Between the fourth stub conductor pattern 14C and the ground conductor 12, it functions as a third capacitor for the fundamental wave of the high-frequency signal propagating through the signal conductor pattern 13A, and functions as a 1 / 4 wavelength open-end stub for the third harmonic of the fundamental wave.

[0119] The tenth strip conductor pattern 14e is a strip line formed on the surface of the first dielectric substrate 11, and constitutes a seventh stub transmission line via the ground conductor 12 and the first dielectric substrate 11. The tenth strip conductor pattern 14e is a linear conductor foil, such as a copper foil, having a length L4. The length L4 of the tenth strip conductor pattern 14e is 2 / 3 of the length L1 of the first strip conductor pattern 14a.

[0120] One end of the tenth strip conductor pattern 14e is electrically connected to one side surface of the other end of the second connection line portion 13A4 of the signal conductor pattern 13A, and the other end of the tenth strip conductor pattern 14e is an open end. The tenth strip conductor pattern 14e and the second connecting line portion 13A4 of the signal conductor pattern 13A are integrally formed conductor foils, and one end of the tenth strip conductor pattern 14e and one side surface at the other end of the second connecting line portion 13A4 are not physically separated, but the boundary surface between the tenth strip conductor pattern 14e and the other side surface of the second connecting line portion 13A4 is referred to as one side surface.

[0121] The tenth strip conductor pattern 14e is disposed on the surface of the first dielectric substrate 11, perpendicular to the second connection line portion 13A4. The connection portion between one end of the tenth strip conductor pattern 14e and the other side of the second connection line portion 13A4 is referred to as a connection portion 13f.

[0122] The eleventh strip conductor pattern 14f is a strip line formed on the surface of the first dielectric substrate 11, and constitutes an eighth stub transmission line via the ground conductor 12 and the first dielectric substrate 11. The eleventh strip conductor pattern 14f is a linear conductor foil, such as a copper foil, having a length L5. The length L5 of the eleventh strip conductor pattern 14f is 2 / 3 of the length L2 of the second strip conductor pattern 14b.

[0123] Both ends of the eleventh strip conductor pattern 14f are open ends, and the open end located at one end of the eleventh strip conductor pattern 14f is disposed at a distance S from the other end of the tenth strip conductor pattern 14e. The eleventh strip conductor pattern 14f is disposed on an extension of the tenth strip conductor pattern 14e. That is, the tenth strip conductor pattern 14e and the eleventh strip conductor pattern 14f are arranged on a straight line in the X direction on the surface of the first dielectric substrate 11 with a gap S therebetween, as shown in FIG.

[0124] The width W of the tenth strip conductor pattern 14e and the width W of the eleventh strip conductor pattern 14f are the same. The width W of the tenth strip conductor pattern 14e and the width W of the eleventh strip conductor pattern 14f are preferably the same as the width W of the first input / output line portion 13A1 and the second input / output line portion 13A2 of the signal conductor pattern 13A, but may be different.

[0125] The tenth strip conductor pattern 14e and the eleventh strip conductor pattern 14f are arranged in positions that are mirror images of the seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d with respect to the central axis of the longitudinal direction (X direction) of the first strip conductor pattern 14a and the second strip conductor pattern 14b.

[0126] The second substrate 20 is a coupling adjustment substrate that has a first coupling degree adjustment conductor pattern, a third coupling degree adjustment conductor pattern, and a fourth coupling degree adjustment conductor pattern for adjusting the coupling degree k, which is the ratio of electromagnetic field coupling with the first stub conductor pattern 14A, the third stub conductor pattern 14B, and the fourth stub conductor pattern 14C on the first substrate 10, and is movable up and down relative to the first substrate 10. The second substrate 20 has a second dielectric substrate 21, and a third strip conductor pattern 22A, a ninth strip conductor pattern 22B, and a twelfth strip conductor pattern 22C.

[0127] The second substrate 20 is disposed opposite the first substrate 10 and is movable up and down relative to the first substrate 10 . A flat movable plate 30 is connected to the surface of the second substrate 20 . The back surface of the flat second dielectric substrate 21 in the second substrate 20 and the front surface of the flat first dielectric substrate 11 in the first substrate 10 are arranged opposite each other, and the second substrate 20 is movable (moved up and down) based on the front surface of the first substrate 10 via a movable plate 30 that can move the second substrate 20 in the front-to-back direction by a movable mechanism (not shown). In addition, in embodiment 3, the second substrate 20 is moved up and down relative to the first substrate 10, but the first substrate 10 may also be moved up and down based on the back surface of the second substrate 20.

[0128] The third strip conductor pattern 22A is a first coupling adjustment conductor pattern for adjusting the degree of coupling k, which is the ratio of electromagnetic field coupling with the first stub conductor pattern 14A on the first substrate 10. The third strip conductor pattern 22A is disposed on the rear surface of the second dielectric substrate 21 so as to face the first strip conductor pattern 14a and the second strip conductor pattern 14b.

[0129] That is, the third strip conductor pattern 22A is located directly above the first strip conductor pattern 14a and the second strip conductor pattern 14b. The third strip conductor pattern 22A is a linear conductor foil, such as a copper foil, having a length L3.

[0130] As shown in Figures 22 and 24, the length L3 of the third strip conductor pattern 22A is the sum of the length L1 of the first strip conductor pattern 14a, the length L2 of the second strip conductor pattern 14b, and the spacing S between the first strip conductor pattern 14a and the second strip conductor pattern 14b. As shown in FIG. 25, the width W of the third strip conductor pattern 22A is the same as the width W of the first strip conductor pattern 14a and the width W of the second strip conductor pattern 14b.

[0131] The third strip conductor pattern 22A is a strip conductor parallel to the first strip conductor pattern 14a and the second strip conductor pattern 14b, and forms a coupled line between the first strip conductor pattern 14a and the second strip conductor pattern 14b when there is a distance d (see Figures 25 and 26) between the first strip conductor pattern 14a and the second strip conductor pattern 14b where the electromagnetic field coupling ranges from tight coupling to loose coupling.

[0132] The third strip conductor pattern 22A is moved up and down within a range from a contact state with the first strip conductor pattern 14a and the second strip conductor pattern 14b (coupling degree k=1) to a state where it is sufficiently separated from them (coupling degree k=0) as the second substrate 20 is moved up and down.

[0133] The third strip conductor pattern 22A is moved up and down, so that the frequency of the second harmonic of the fundamental wave in the high-frequency signal propagating through the signal conductor pattern 13A is lower than the lower limit frequency f 2L to the upper frequency f 2H The first strip conductor pattern 14a, the second strip conductor pattern 14b and the third strip conductor pattern 22A can function as adjustable quarter-wave open-circuit stubs for the conductor pattern 14a. Upper frequency limit f 2H is the lower limit frequency f 2L The length L3 of the third strip conductor pattern 22A is set to twice the length L1 of the first strip conductor pattern 14a.

[0134] Furthermore, by moving the third strip conductor pattern 22A up and down, the resonance frequency of the high-frequency signal propagating through the first strip conductor pattern 14a and the second strip conductor pattern 14b reaches the lower limit frequency f 2L to the upper frequency f 2H By adjusting the capacitance of the first capacitor between the first stub conductor pattern 14A and the ground conductor 12 to the upper limit capacitance value C 2H to the lower limit capacitance value C 2L can be adjusted to.

[0135] The ninth strip conductor pattern 22B is a third coupling adjustment conductor pattern for adjusting the degree of coupling k, which is the ratio of electromagnetic field coupling with the third stub conductor pattern 14B on the first substrate 10. The ninth strip conductor pattern 22B is disposed on the rear surface of the second dielectric substrate 21 so as to face the seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d.

[0136] That is, the ninth strip conductor pattern 22B is located directly above the seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d. The ninth strip conductor pattern 22B is a linear conductor foil, such as a copper foil, having a length L6.

[0137] As shown in Figures 22 and 24, the length L6 of the ninth strip conductor pattern 22B is the sum of the length L4 of the seventh strip conductor pattern 14c, the length L5 of the eighth strip conductor pattern 14d, and the spacing S between the seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d.

[0138] The length L6 of the ninth strip conductor pattern 22B is 2 / 3 of the length L3 of the third strip conductor pattern 22A. As shown in FIG. 25, the width W of the ninth strip conductor pattern 22B is the same as the width W of the seventh strip conductor pattern 14c and the width W of the eighth strip conductor pattern 14d.

[0139] The ninth strip conductor pattern 22B is a strip conductor parallel to the seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d, and forms a coupled line between the seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d when there is a distance d (see Figures 25 and 27) between the seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d, where the electromagnetic field coupling ranges from tight coupling to loose coupling.

[0140] The ninth strip conductor pattern 22B moves up and down within a range from contact with the seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d (coupling degree k=1) to being sufficiently separated from them (coupling degree k=0) as the second substrate 20 moves up and down.

[0141] The ninth strip conductor pattern 22B is moved up and down, so that the frequency of the third harmonic of the fundamental wave in the high-frequency signal propagating through the signal conductor pattern 13A is lower than the lower limit frequency f 3L to the upper frequency f 3H The seventh strip conductor pattern 14c, the eighth strip conductor pattern 14d and the ninth strip conductor pattern 22B can function as adjustable quarter-wave open-circuit stubs for the conductor pattern 14c. Upper frequency limit f 3H is the lower limit frequency f 3L The length L6 of the ninth strip conductor pattern 22B is set to twice the length L4 of the seventh strip conductor pattern 14c.

[0142] Furthermore, by moving the ninth strip conductor pattern 22B up and down, the resonance frequency of the high-frequency signal propagating through the seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d reaches the lower limit frequency f 3L to the upper frequency f 3H By adjusting the capacitance of the second capacitor between the third stub conductor pattern 14B and the ground conductor 12 to the upper limit capacitance value C 3H to the lower limit capacitance value C 3L can be adjusted to.

[0143] The twelfth strip conductor pattern 22C is a fourth coupling adjustment conductor pattern for adjusting the degree of coupling k, which is the ratio of electromagnetic field coupling with the fourth stub conductor pattern 14C on the first substrate 10. The twelfth strip conductor pattern 22C is disposed on the rear surface of the second dielectric substrate 21 so as to face the tenth strip conductor pattern 14e and the eleventh strip conductor pattern 14f.

[0144] That is, the twelfth strip conductor pattern 22C is located directly above the tenth strip conductor pattern 14e and the eleventh strip conductor pattern 14f. The twelfth strip conductor pattern 22C is a linear conductor foil, such as a copper foil, having a length L6.

[0145] As shown in Figures 22 and 24, the length L6 of the 12th strip conductor pattern 22C is the sum of the length L4 of the 10th strip conductor pattern 14e, the length L5 of the 11th strip conductor pattern 14f, and the spacing S between the 10th strip conductor pattern 14e and the 11th strip conductor pattern 14f.

[0146] The length L6 of the twelfth strip conductor pattern 22C is 2 / 3 of the length L3 of the third strip conductor pattern 22A. As shown in FIG. 25, the width W of the twelfth strip conductor pattern 22C is the same as the width W of the tenth strip conductor pattern 14e and the width W of the eleventh strip conductor pattern 14f.

[0147] The twelfth strip conductor pattern 22C is a strip conductor parallel to the tenth strip conductor pattern 14e and the eleventh strip conductor pattern 14f, and forms a coupled line between the tenth strip conductor pattern 14e and the eleventh strip conductor pattern 14f when the electromagnetic field coupling between the tenth strip conductor pattern 14e and the eleventh strip conductor pattern 14f is at a distance d (see Figures 25 and 27) from the close coupling to the loose coupling.

[0148] The 12th strip conductor pattern 22C is moved up and down within a range from a contact state with the 10th strip conductor pattern 14e and the 11th strip conductor pattern 14f (coupling degree k=1) to a state sufficiently separated (coupling degree k=0) by moving the second substrate 20 up and down.

[0149] The twelfth strip conductor pattern 22C is moved up and down, so that the frequency of the third harmonic of the fundamental wave in the high-frequency signal propagating through the signal conductor pattern 13A is lower than the lower limit frequency f 3L to the upper frequency f 3HThe tenth strip conductor pattern 14e, the eleventh strip conductor pattern 14f and the twelfth strip conductor pattern 22C can function as adjustable quarter-wavelength open-ended stubs for the conductor pattern 22c. Upper frequency limit f 3H is the lower limit frequency f 3L The length L6 of the twelfth strip conductor pattern 22C is set to twice the length L4 of the tenth strip conductor pattern 14e.

[0150] Furthermore, by moving the twelfth strip conductor pattern 22C up and down, the resonance frequency of the high-frequency signal propagating through the tenth strip conductor pattern 14e and the eleventh strip conductor pattern 14f reaches the lower limit frequency f 3L to the upper frequency f 3H By adjusting the capacitance of the third capacitor between the fourth stub conductor pattern 14C and the ground conductor 12 to the upper limit capacitance value C 3H to the lower limit capacitance value C 3L can be adjusted to.

[0151] Next, the length L1 of the first strip conductor pattern 14a, the length L2 of the second strip conductor pattern 14b, and the length L3 of the third strip conductor pattern 22A will be described. When the third strip conductor pattern 22A is in contact with the first strip conductor pattern 14a and the second strip conductor pattern 14b, that is, when the distance d is 0 and the degree of coupling, which is the ratio of electromagnetic field coupling, k is 1, the third strip conductor pattern 22A is electrically conductive with the first strip conductor pattern 14a and the second strip conductor pattern 14b, which is electrically equivalent to a stub conductor pattern of length L3 being connected to the connection portion 13c of the signal conductor pattern 13A.

[0152] The length L3 of the third strip conductor pattern 22A is set to a value equal to the lower limit frequency f of the fundamental wave f1 of the high-frequency signal propagating through the signal conductor pattern 13A. 1L twice the frequency f 2L (=2×f 1L), that is, the lower limit frequency f for the double wave frequency f2 2L The lower limit frequency f of the fundamental wave f1 is set to the first resonance frequency. 1L twice the frequency f 2L The length is set to 1 / 4 of the propagation wavelength at

[0153] As a result, the stub transmission line formed by the third strip conductor pattern 22A, the first strip conductor pattern 14a, and the second strip conductor pattern 14b has a lower limit frequency f 2L , the signal conductor pattern 13A functions as a quarter-wave open stub with an electrically shorted point formed at the connection portion 13c.

[0154] Therefore, in the signal conductor pattern 13A, the lower limit frequency f 2L and the lower limit frequency f for the double wave 2L A high-frequency signal at a frequency in the vicinity of the third strip conductor pattern 22A is attenuated by the quarter-wave open-end stub based on the stub transmission line formed by the third strip conductor pattern 22A, the first strip conductor pattern 14a, and the second strip conductor pattern 14b, and is prevented from passing to the second input / output terminal 13b.

[0155] Similarly, the lower limit frequency f of the double wave of the fundamental wave in the high frequency signal input from the second input / output terminal 13b is 2L and the lower limit frequency f for the double wave 2L A high-frequency signal at a frequency in the vicinity of the third strip conductor pattern 22A is attenuated by the quarter-wave open-end stub based on the stub transmission line formed by the third strip conductor pattern 22A, the first strip conductor pattern 14a, and the second strip conductor pattern 14b, and is prevented from passing to the second input / output terminal 13b.

[0156] The capacitance of the first capacitor between the first strip conductor pattern 14a and the ground conductor 12 and the second strip conductor pattern 14b is set to a lower limit frequency f 2L The upper limit of capacitance C 2H This becomes:

[0157] When the distance d between the third strip conductor pattern 22A and the first and second strip conductor patterns 14a and 14b is sufficiently large and the degree of coupling k, which is the ratio of electromagnetic field coupling, is 0, the first strip conductor pattern 14a and the second strip conductor pattern 14b are not affected by the third strip conductor pattern 22A, and therefore this is electrically equivalent to the first strip conductor pattern 14a of length L1 being connected to the connection portion 13c in the signal conductor pattern 13 as a stub conductor pattern.

[0158] The length L1 of the first strip conductor pattern 14a is set to the upper limit frequency f of the fundamental wave f1 of the high-frequency signal propagating through the signal conductor pattern 13A. 1H twice the frequency f 2H (=2×f 1H ), that is, the upper limit frequency for the frequency f2 of the double wave of the fundamental wave is f 2H The upper limit frequency f of the fundamental wave f1 is set to the second resonant frequency. 1H twice the frequency f 2H The length is set to 1 / 4 of the propagation wavelength at As a result, the stub transmission line formed by the first strip conductor pattern 14a has an upper limit frequency f 2H , the signal conductor pattern 13A functions as a quarter-wave open stub with an electrically shorted point formed at the connection portion 13c.

[0159] Therefore, in the signal conductor pattern 13A, the upper limit frequency f 2H and the upper frequency limit for the double wave, f 2HHigh-frequency signals at frequencies in the vicinity thereof are attenuated by the quarter-wave open-end stub based on the stub transmission line formed by the first strip conductor pattern 14a, and are prevented from passing to the second input / output terminal 13b.

[0160] Similarly, the upper limit frequency f of the double wave of the fundamental wave in the high frequency signal input from the second input / output terminal 13b is 2H and the upper frequency limit for the double wave, f 2H High-frequency signals at frequencies in the vicinity thereof are attenuated by the quarter-wave open-end stub based on the stub transmission line formed by the first strip conductor pattern 14a, and are prevented from passing to the second input / output terminal 13b.

[0161] The capacitance of the first capacitor between the first strip conductor pattern 14a and the ground conductor 12 and the second strip conductor pattern 14b is set to an upper limit frequency f 2H The lower limit of the capacitance value C 2L This becomes:

[0162] The upper limit frequency f for the double wave of the fundamental wave 2H is the lower limit frequency for the double wave, f 2L At twice the frequency (f 2H =2×f 2L ), and the length L3 of the third strip conductor pattern 22A is set to be approximately twice the length L1 of the first strip conductor pattern 14a (L3≈2×L1). The length L2 of the second strip conductor pattern 14b is set to the length L3 of the third strip conductor pattern 22A minus the sum of the length L1 of the first strip conductor pattern 14a and the distance S between the other end of the first strip conductor pattern 14a and one end of the second strip conductor pattern 14b (L2 ≈ L3 - L1 - S).

[0163] When the distance d between the third strip conductor pattern 22A, the first strip conductor pattern 14a, and the second strip conductor pattern 14b is such that the coupling degree k, which is the ratio of electromagnetic field coupling, exceeds 0 and is less than 1 (0 < k < 1), a first coupling line 22Aa is formed between the third strip conductor pattern 22A and the first strip conductor pattern 14a, and a second coupling line 22Ab is formed between the third strip conductor pattern 22A and the second strip conductor pattern 14b.

[0164] That is, the stub transmission line connected to the connection portion 13c in the signal conductor pattern 13 is electrically equivalent to a circuit in which one end of the first coupling line 22Aa is connected to the connection portion 13c in the signal conductor pattern 13A and the other end of the first coupling line 22Aa is longitudinally connected to one end of the second coupling line 22Ab, as shown in FIG. 28.

[0165] Therefore, for a high-frequency signal having a frequency f2 that is twice the fundamental wave propagating through the stub transmission line formed by the first coupling line 22Aa and the second coupling line 22Ab, when the intermediate frequency f 2m is set as the third resonance frequency, as the contact state between the third strip conductor pattern 22A, the first strip conductor pattern 14a, and the second strip conductor pattern 14b moves away in the Z direction, that is, as the distance d increases, the coupling degree k decreases from 1, so the intermediate frequency f 2m is shifted to a higher frequency side than the lower frequency f 2L and an electrical short circuit point is always formed at the connection portion 13c in the signal conductor pattern 13A.

[0166] When the distance d is further increased and the coupling degree k approaches 0, the intermediate frequency f 2m is shifted so as to asymptotically approach the upper frequency f <000​​​​​

[0167] That is, by moving the second substrate 20 up and down with respect to the surface of the first substrate 10 as a reference, the first strip conductor pattern 14a, the second strip conductor pattern 14b, and the third strip conductor pattern 22A can transmit the lower limit frequency f 2L to the upper frequency f 2H The resonant frequency can be changed within the range of , and the stub can be operated as a quarter wavelength open stub at a frequency according to the selected distance d.

[0168] Therefore, in the signal conductor pattern 13A, the intermediate frequency f 2m and intermediate frequency f 2m A high-frequency signal at a frequency in the vicinity of the third strip conductor pattern 22A is attenuated by the quarter-wave open-end stub based on the stub transmission line formed by the third strip conductor pattern 22A, the first strip conductor pattern 14a, and the second strip conductor pattern 14b, and is prevented from passing to the second input / output terminal 13b.

[0169] Similarly, in the signal conductor pattern 13A, the intermediate frequency f 2m and intermediate frequency f 2m A high-frequency signal at a frequency in the vicinity of the third strip conductor pattern 22A is attenuated by the quarter-wave open-end stub based on the stub transmission line formed by the third strip conductor pattern 22A, the first strip conductor pattern 14a, and the second strip conductor pattern 14b, and is prevented from passing to the first input / output terminal 13a. In the third embodiment, the lower limit frequency f 2L and the upper frequency f 2H and intermediate frequency f 2m The relationship between 2L <f 2m <f 2H and f 2H =2×f 2L is set to.

[0170] The capacitance of the first capacitor between the first strip conductor pattern 14a and the ground conductor 12 and the second strip conductor pattern 14b is set to an intermediate frequency f 2m The intermediate capacitance value C associated with 2m This becomes: In the third embodiment, the lower limit capacitance value C 2L and the upper limit capacitance value C 2H and intermediate capacitance value C 2m The relationship is C 2L <C 2m <C 2H This is the relationship.

[0171] From the above, in the third embodiment, as shown in FIG. 29, the equivalent length L according to the distance d is 2m (L1≦L 2m ≦L3), and the lower limit frequency f2 is the frequency of the double wave of the fundamental wave. 2L to the upper frequency f 2H This is electrically equivalent to connecting the stub transmission line 15A, which can adjust the resonant frequency up to 1 / 2 GHz, to the connecting portion 13c of the signal conductor pattern 13A.

[0172] Length L 2m The stub transmission line 15A has a selected length L 2m , that is, the lower limit frequency f according to the distance d selected by moving the second substrate 20 up and down. 2L to the upper frequency f 2H The frequency (f 2L more than f 2H (=2×f 2L ) or lower), it operates as a quarter-wave open stub in which an electrically shorted point is formed at the connection portion 13c of the signal conductor pattern 13A, as shown in FIG.

[0173] Also, the length L 2m The stub transmission line 15A has a selected length L 2m , that is, the upper limit capacitance value C according to the distance d selected by moving the second substrate 20 up and down. 2H to the lower limit capacitance value C2L Capacitance value (C 2L More than C 2H (capacitance value below).

[0174] The length L4 of the seventh strip conductor pattern 14c, the length L5 of the eighth strip conductor pattern 14d, the length L6 of the ninth strip conductor pattern 22B, and the length L4 of the tenth strip conductor pattern 14e, the length L5 of the eleventh strip conductor pattern 14f, and the length L6 of the twelfth strip conductor pattern 22C will be described below. The length L4 is set to 2 / 3 of the length L1, the length L6 is set to 2 / 3 of the length L3, and the length L5 is set to 2 / 3 of the length L2.

[0175] Therefore, the stub transmission line based on the seventh strip conductor pattern 14c, the eighth strip conductor pattern 14d, and the ninth strip conductor pattern 22B, which is connected to the connection portion 13e in the signal conductor pattern 13A, operates as a quarter-wave open-end stub in which an electrical short-circuit point is formed at the connection portion 13e in the signal conductor pattern 13A at the frequency f3 that is the third harmonic of the fundamental wave in the high-frequency signal propagating through the signal conductor pattern 13A.

[0176] Furthermore, the stub transmission line based on the tenth strip conductor pattern 14e, the eleventh strip conductor pattern 14f, and the twelfth strip conductor pattern 22C, which are connected to the connection portion 13f in the signal conductor pattern 13A, operates as a quarter-wavelength open-end stub in which an electrical short-circuit point is formed at the connection portion 13f in the signal conductor pattern 13A at the frequency f3 that is the third harmonic of the fundamental wave in the high-frequency signal propagating through the signal conductor pattern 13A.

[0177] As shown in FIG. 28, the stub transmission line connected to the connection portion 13e of the signal conductor pattern 13A is electrically equivalent to a circuit in which one end of the fifth coupled line 22Ba is connected to the connection portion 13e of the signal conductor pattern 13A and the other end of the sixth coupled line 22Bb is cascade-connected to one end of the fifth coupled line 22Ba, and as shown in FIG. 29, an equivalent length L3m (L4≦L 3m ≦L6), and the lower limit frequency f3 is the frequency of the triplet of the fundamental wave. 3L to the upper frequency f 3H This is electrically equivalent to connecting the stub transmission line 15B, which can adjust the resonant frequency up to 1 / 3 GHz, to the connection portion 13e of the signal conductor pattern 13A.

[0178] 28, the stub transmission line connected to the connection portion 13f of the signal conductor pattern 13A is electrically equivalent to a circuit in which one end of the seventh coupled line 22Ca is connected to the connection portion 13f of the signal conductor pattern 13A and the other end of the eighth coupled line 22Cb is cascade-connected to one end of the seventh coupled line 22Ca, and as shown in FIG. 29, an equivalent length L 3m (L4≦L 3m ≦L6), and the lower limit frequency f3 is the frequency of the triplet of the fundamental wave. 3L to the upper frequency f 3H This is electrically equivalent to connecting the stub transmission line 15C, which can adjust the resonant frequency up to 1 / 3 GHz, to the connection portion 13e of the signal conductor pattern 13A.

[0179] Length L 3m stub transmission line 15B having a length L 3m stub transmission lines 15C each having a selected length L 3m , that is, the lower limit frequency f according to the distance d selected by moving the second substrate 20 up and down. 3L to the upper frequency f 3H The frequency (f 3L more than f 3H (=2×f 3L 31, the signal conductor pattern 13A operates as a quarter-wave open stub in which electrical short-circuit points are formed at the connection portions 13e and 13f, respectively, at frequencies below 13e and 13f.

[0180] Therefore, in the signal conductor pattern 13A, the frequency (f 3L more than f3H A high-frequency signal at a frequency selected from the following frequencies is attenuated by the quarter-wavelength open-end stub based on the stub transmission line formed by the seventh strip conductor pattern 14c, the eighth strip conductor pattern 14d, and the ninth strip conductor pattern 22B, and is prevented from passing to the second input / output terminal 13b.

[0181] In addition, in the signal conductor pattern 13A, the frequency (f 3L more than f 3H A high-frequency signal at a frequency selected from the following frequencies is attenuated by the quarter-wavelength open-end stub based on the stub transmission line formed by the tenth strip conductor pattern 14e, the eleventh strip conductor pattern 14f, and the twelfth strip conductor pattern 22C, and is prevented from passing to the first input / output terminal 13a.

[0182] On the other hand, length L 3m stub transmission line 15B having a length L 3m Each of the stub transmission lines 15 has a selected length L 3m , that is, the upper limit capacitance value C according to the distance d selected by moving the second substrate 20 up and down. 3H to the lower limit capacitance value C 3L Capacitance value (C 3L More than C 3H (capacitance value below). The second substrate 20 is moved up and down to a selected distance d, and the length L 3m stub transmission line 15B having a length L 3m The capacitance of each stub transmission line 15 having a length L 2m The capacitance is smaller than the capacitance of the stub transmission line 15A having the capacitance.

[0183] In other words, in the third embodiment, the third strip conductor pattern 22A is moved up and down, so that the resonance frequency for the double wave of the frequency f2 of the high frequency signal propagating through the signal conductor pattern 13A is set to the lower limit frequency f 2Lto the upper frequency f 2H Tune to a frequency between The ninth strip conductor pattern 22B and the twelfth strip conductor pattern 22C are respectively moved up and down, so that the resonance frequency for the triple wave of the frequency f3 in the high frequency signal propagating through the signal conductor pattern 13A is set to the lower limit frequency f 3L to the upper frequency f 3H Tune to a frequency between As a result, the variable frequency range that can be mechanically adjusted to the frequencies of the second and third harmonics of the fundamental wave in the high-frequency signal propagating between the first input / output terminal 13a and the second input / output terminal 13b is wide, and the passage of the second and third harmonics of the fundamental wave can be blocked with high precision.

[0184] On the other hand, in the third embodiment, the third strip conductor pattern 22A is moved up and down with respect to the fundamental wave of the high-frequency signal propagating between the first input / output terminal 13a and the second input / output terminal 13b, so that the capacitance value of the first capacitor between the first stub conductor pattern 14A and the ground conductor 12 is increased to the upper limit capacitance value C 2H to the lower limit capacitance value C 2L The capacitance is adjusted to

[0185] The ninth strip conductor pattern 22B is moved up and down relative to the fundamental wave of the high-frequency signal propagating between the first input / output terminal 13a and the second input / output terminal 13b, so that the capacitance value of the second capacitor between the third stub conductor pattern 14B and the ground conductor 12 is increased to an upper limit capacitance value C 3H to the lower limit capacitance value C 3L The capacitance is adjusted to The twelfth strip conductor pattern 22C is moved up and down relative to the fundamental wave of the high-frequency signal propagating between the first input / output terminal 13a and the second input / output terminal 13b, so that the capacitance value of the third capacitor between the fourth stub conductor pattern 14C and the ground conductor 12 is increased to an upper limit capacitance value C 3H to the lower limit capacitance value C 3L The capacitance is adjusted to

[0186] That is, by simultaneously moving the third strip conductor pattern 22A, the ninth strip conductor pattern 22B, and the twelfth strip conductor pattern 22C up and down, the capacitance values ​​of the first to third capacitors for the fundamental wave of frequency f1 of the high-frequency signal propagating through the signal conductor pattern 13A can be adjusted.

[0187] As shown in FIG. 32, for the fundamental wave of a high-frequency signal propagating through the signal conductor pattern 13A, a low-pass filter is formed by an LC circuit including two inductors connected in series between the connection portion 13e and the connection portion 13f by the first connection line portion 13A3 and the second connection line portion 13A4, a first capacitor 18A with variable capacitance C2 formed by the first stub conductor pattern 14A connected to the connection portion 13c, a second capacitor 18B with variable capacitance C3 formed by the third stub conductor pattern 14B connected to the connection portion 13e, and a third capacitor 18C with variable capacitance C3 formed by the fourth stub conductor pattern 14C connected to the connection portion 13f.

[0188] The low-pass filter configured in this manner has a lower limit frequency f corresponding to the distance d selected by moving the second substrate 20 up and down with respect to the frequency of the fundamental wave of the high-frequency signal propagating between the first input / output terminal 13a and the second input / output terminal 13b in the signal conductor pattern 13A. 1L to the upper frequency f 1H Since it can be mechanically adjusted to a frequency between f and m, the variable frequency range is wide relative to the fundamental frequency, and the cutoff frequency of the low-pass filter can be adjusted to the lower limit frequency f 1L to the upper frequency f 1H It can be adjusted with high precision within the range.

[0189] As described above, the high-frequency variable filter circuit according to the third embodiment includes, on the surface of the first dielectric substrate 11, a signal conductor pattern 13A having a first input / output line portion 13A1, a first connecting line portion 13A3, a second connecting line portion 13A4, and a second input / output line portion 13A2 that are connected in sequence, a first strip conductor pattern 14a that is electrically connected to a connecting portion 13c between the other end of the first connecting line portion 13A3 and one end of the second connecting line portion 13A4, a second strip conductor pattern 14b that is disposed at an interval from the other end of the first strip conductor pattern 14a, and a second strip conductor pattern 14b that is disposed at an interval from the other end of the first strip conductor pattern 14a. The first substrate 10 has a seventh strip conductor pattern 14c electrically connected to a connection portion 13e which is one end of the connection line portion 13A3, an eighth strip conductor pattern 14d arranged at a distance from the other end of the seventh strip conductor pattern 14c, a tenth strip conductor pattern 14e one end of which is electrically connected to a connection portion 13f which is the other end of the second connection line portion 14A4, and an eleventh strip conductor pattern 14f arranged at a distance from the other end of the tenth strip conductor pattern 14e. a second substrate (20) having a third strip conductor pattern (22A) arranged opposite the lip conductor pattern (14a) and the second strip conductor pattern (14b), a ninth strip conductor pattern (22B) arranged opposite the seventh strip conductor pattern (14c) and the eighth strip conductor pattern (14d), and a twelfth strip conductor pattern (22C) arranged opposite the tenth strip conductor pattern (14e) and the eleventh strip conductor pattern (14f); and a substrate (20) connected to the front surface of the second substrate (20) and movable in the front-to-rear direction of the second substrate (20); Since a movable plate for adjusting the distance between the front surface of the first substrate 10 and the rear surface of the second substrate 20 is provided, a variable capacitance C2 in the first capacitor 18A formed by the first stub conductor pattern 14A based on the first strip conductor pattern 14a and the second strip conductor pattern 14b connected to the connection portion 13c, a variable capacitance C3 based on the second capacitor 18B formed by the third stub conductor pattern 14B based on the seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d connected to the connection portion 13e,The variable capacitance C3 of the third capacitor 18C, which is formed by the fourth stub conductor pattern 14C based on the tenth strip conductor pattern 14e and the eleventh strip conductor pattern 14f connected to the connecting portion 13f, is adjusted to an upper limit capacitance value C by moving the second substrate 20 up and down with respect to the surface of the first substrate 10. 2H , C 3H to the lower limit capacitance value C 2L , C 3L As a result, the frequency f1 of the fundamental wave propagating through the signal conductor pattern 13A can be adjusted to a lower limit frequency f 1L to the upper frequency f 1H Since it can be mechanically adjusted to a frequency between f and m, the variable frequency range is wide relative to the fundamental frequency, and the cutoff frequency of the low-pass filter can be adjusted to the lower limit frequency f 1L to the upper frequency f 1H It can be adjusted with high precision within the range.

[0190] Furthermore, the high-frequency variable filter circuit according to the third embodiment has an upper limit frequency f as a variable frequency range for the fundamental frequency f1. 1H The lower limit frequency f 1L Since the frequency is double that of the fundamental wave, the fundamental wave frequency f1 can be mechanically set over a wide range of 50% when converted into a ratio.

[0191] Furthermore, in the high-frequency variable filter circuit according to the third embodiment, the degree of coupling k, which is the ratio of electromagnetic field coupling between the first strip conductor pattern 14a and the second strip conductor pattern 14b and the third strip conductor pattern 22A, the degree of coupling k, which is the ratio of electromagnetic field coupling between the seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d and the ninth strip conductor pattern 22B, and the degree of coupling k, which is the ratio of electromagnetic field coupling between the tenth strip conductor pattern 14e and the eleventh strip conductor pattern 14f and the twelfth strip conductor pattern 22C, can be changed from 1 to 0 by moving the second substrate 20 up and down with respect to the surface of the first substrate 10. Therefore, the resonant frequency can be changed from the resonant frequency f when the degree of coupling k is 1 to the resonant frequency f when the degree of coupling k is 1. 2L , f 3LFrom the above, the resonant frequency f when the coupling factor k is 0 2H , f 3H As a result, the variable frequency range that can be mechanically adjusted to the frequencies of the second and third harmonics of the fundamental wave is wide, and the passage of the second and third harmonics of the fundamental wave can be blocked with high precision according to the selected fundamental wave frequency.

[0192] Embodiment 4 A high-frequency variable filter circuit according to the fourth embodiment will be described with reference to FIGS. The high-frequency variable filter circuit according to the fourth embodiment differs from the high-frequency variable filter circuit according to the third embodiment in that a second stub conductor pattern 16A, a fifth stub conductor pattern 16B, and a sixth stub conductor pattern 16C, which are mirror images of the first stub conductor pattern 14A, the fifth stub conductor pattern 16B, and the fourth stub conductor pattern 14C, are additionally arranged on the front surface of the first dielectric substrate 11, with respect to the central axis of the longitudinal direction (Y direction) of the signal conductor pattern 13A; The difference is that a sixth strip conductor pattern 23A, which is a second coupling adjustment conductor pattern for adjusting the coupling degree, which is the ratio of electromagnetic field coupling with the stub conductor pattern 16A, a fifteenth strip conductor pattern 23B, which is a fifth coupling adjustment conductor pattern for adjusting the coupling degree, which is the ratio of electromagnetic field coupling with the fifth stub conductor pattern 16B, and an eighteenth strip conductor pattern 23C, which is a sixth coupling adjustment conductor pattern for adjusting the coupling degree, which is the ratio of electromagnetic field coupling with the sixth stub conductor pattern 16C, are additionally arranged, but other points are the same.

[0193] 33 to 35, the same reference numerals as those in FIGS. 1 to 15 and 20 to 27 indicate the same or corresponding parts. The following description will focus on the differences from the high-frequency variable filter circuit of embodiment 3, namely, the second stub conductor pattern 16A and the sixth strip conductor pattern 23A which is the second coupling adjustment conductor pattern, the fifth stub conductor pattern 16B and the fifteenth strip conductor pattern 23B which is the fifth coupling adjustment conductor pattern, and the sixth stub conductor pattern 16C and the eighteenth strip conductor pattern 23C which is the sixth coupling adjustment conductor pattern.

[0194] The high-frequency variable filter circuit according to the fourth embodiment includes a first substrate 10, a second substrate 20, and a movable plate 30. As shown in FIG. 34, the first substrate 10 has a first dielectric substrate 11, a ground conductor 12, a signal conductor pattern 13A, a first stub conductor pattern 14A, a third stub conductor pattern 14B, a fourth stub conductor pattern 14C, a second stub conductor pattern 16A, a fifth stub conductor pattern 16B, and a sixth stub conductor pattern 16C.

[0195] As shown in Figure 35, the second substrate 20 has a second dielectric substrate 21, a third strip conductor pattern 22A which is the first coupling adjustment conductor pattern, a ninth strip conductor pattern 22B which is the third coupling adjustment conductor pattern, a twelfth strip conductor pattern 22C which is the fourth coupling adjustment conductor pattern, a sixth strip conductor pattern 23A which is the second coupling adjustment conductor pattern, a fifteenth strip conductor pattern 23B which is the fifth coupling adjustment conductor pattern, and an eighteenth strip conductor pattern 23C which is the sixth coupling adjustment conductor pattern.

[0196] The first dielectric substrate 11, the ground conductor 12, the signal conductor pattern 13A, the first stub conductor pattern 14A, the third stub conductor pattern 14B, and the fourth stub conductor pattern 14C are the same as the first dielectric substrate 11, the ground conductor 12, the signal conductor pattern 13A, the first stub conductor pattern 14A, the third stub conductor pattern 14B, and the fourth stub conductor pattern 14C in the high-frequency variable filter circuit according to embodiment 3, and therefore their description will be omitted.

[0197] Furthermore, the second dielectric substrate 21, the third strip conductor pattern 22A, the ninth strip conductor pattern 22B, and the twelfth strip conductor pattern 22C are the same as the second dielectric substrate 21, the third strip conductor pattern 22A, the ninth strip conductor pattern 22B, and the twelfth strip conductor pattern 22C in the high-frequency variable filter circuit according to embodiment 3, and therefore their description will be omitted.

[0198] However, in the fourth embodiment, the width W1 of the first strip conductor pattern 14a and the width W1 of the second strip conductor pattern 14b constituting the first stub conductor pattern 14A, the width W1 of the seventh strip conductor pattern 14c and the width W1 of the eighth strip conductor pattern 14d constituting the third stub conductor pattern 14B, and the width W1 of the tenth strip conductor pattern 14e and the width W1 of the eleventh strip conductor pattern 14f constituting the fourth stub conductor pattern 14C are the same as those of the high-frequency conductor pattern according to the third embodiment. The width W of the signal conductor pattern 13A in the wave variable filter circuit is narrower than the width W of the first strip conductor pattern 14a and the width W of the second strip conductor pattern 14b that constitute the first stub conductor pattern 14A, the width W of the seventh strip conductor pattern 14c and the width W of the eighth strip conductor pattern 14d that constitute the third stub conductor pattern 14B, and the width W of the tenth strip conductor pattern 14e and the width W of the eleventh strip conductor pattern 14f that constitute the fourth stub conductor pattern 14C.

[0199] Therefore, in the fourth embodiment, the occupied area of ​​the connection portion 13c, which is the connection point between one end of the first strip conductor pattern 14a and one side of the junction between the first connecting line portion 13A3 and the second connecting line portion 13A4, the occupied area of ​​the connection portion 13e, which is the connection point between one end of the seventh strip conductor pattern 14c and one side of the first connecting line portion 13A3, and the occupied area of ​​the connection portion 13f, which is the connection point between one end of the tenth strip conductor pattern 14e and the other side of the second connecting line portion 13A4, can be reduced, thereby reducing the influence of the occupied areas of the connection portions 13c, 13e, and 13f on the pass characteristics (frequency characteristics) of high-frequency signals propagating through the signal conductor pattern 13.

[0200] Furthermore, the width W1 of the third strip conductor pattern 22A, the width W1 of the ninth strip conductor pattern 22B, and the width W1 of the twelfth strip conductor pattern 22C are narrower than the width W of the third strip conductor pattern 22A, the width W of the ninth strip conductor pattern 22B, and the width W of the twelfth strip conductor pattern 22C in the high-frequency variable filter circuit according to embodiment 3.

[0201] The width W1 of the first strip conductor pattern 14a, the second strip conductor pattern 14b, and the third strip conductor pattern 22A is narrow, and the coupling lines between the first strip conductor pattern 14a, the second strip conductor pattern 14b, and the third strip conductor pattern 22A have high characteristic impedance.

[0202] The width W1 of the seventh strip conductor pattern 14c, the eighth strip conductor pattern 14d, and the ninth strip conductor pattern 22B is narrow, and the coupling lines between the seventh strip conductor pattern 14c, the eighth strip conductor pattern 14d, and the ninth strip conductor pattern 22B have high characteristic impedance.

[0203] The width W1 of the tenth strip conductor pattern 14e, the eleventh strip conductor pattern 14f, and the twelfth strip conductor pattern 22C is narrow, and the coupling lines between the tenth strip conductor pattern 14e, the eleventh strip conductor pattern 14f, and the twelfth strip conductor pattern 22C have high characteristic impedance.

[0204] The second stub conductor pattern 16A on the first substrate 10 is arranged on the surface of the first dielectric substrate 11 at a position mirror-symmetrical to the first stub conductor pattern 14A with respect to the central axis of the longitudinal direction (Y direction) of the signal conductor pattern 13A. The second stub conductor pattern 16A is composed of a fourth strip conductor pattern 16a and a fifth strip conductor pattern 16b. Between the second stub conductor pattern 16A and the ground conductor 12, the second stub conductor pattern 16A functions as a fourth capacitor for the fundamental wave of the high-frequency signal propagating through the signal conductor pattern 13A, and functions as a 1 / 4 wavelength open-end stub for the double wave of the fundamental wave.

[0205] The fourth strip conductor pattern 16a is a strip line formed on the surface of the first dielectric substrate 11, and constitutes a third stub transmission line via the ground conductor 12 and the first dielectric substrate 11. The fourth strip conductor pattern 16a is a linear conductor foil, such as a copper foil, having a length L1 and a width W1.

[0206] One end of the fourth strip conductor pattern 16a is electrically connected to the other side of the junction between the other end of the first connecting line portion 13A3 of the signal conductor pattern 13A and one end of the second connecting line portion 13A4, and the other end of the fourth strip conductor pattern 16a is an open end. The fourth strip conductor pattern 16a and the first and second connection line portions 13A3 and 13A4 of the signal conductor pattern 13A are integrally formed as conductor foils.

[0207] The fourth strip conductor pattern 16a is arranged on the surface of the first dielectric substrate 11 on an extension of the first strip conductor pattern 14a, and is perpendicular to the signal conductor pattern 13A. The connection portion between one end of the fourth strip conductor pattern 16a and the other side surface of the signal conductor pattern 13A is referred to as a connection portion 13d. Since the width W1 of the fourth strip conductor pattern 16a is narrower than the width W, the area occupied by the connection portion 13d can be made smaller, and the influence of the area occupied by the connection portion 13d on the pass characteristics (frequency characteristics) of high-frequency signals propagating through the signal conductor pattern 13 is reduced.

[0208] The fifth strip conductor pattern 16b is a strip line formed on the surface of the first dielectric substrate 11, and constitutes a fourth stub transmission line via the ground conductor 12 and the first dielectric substrate 11. The fifth strip conductor pattern 16b is a linear conductor foil, such as a copper foil, having a length L2 and a width W1.

[0209] Both ends of the fifth strip conductor pattern 16b are open ends, and the open end located at one end of the fifth strip conductor pattern 16b is disposed at a distance S from the other end of the fourth strip conductor pattern 16a. The fifth strip conductor pattern 16b is disposed on an extension of the fourth strip conductor pattern 16a. That is, the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b are arranged on a straight line in the X direction with a gap S therebetween on the surface of the first dielectric substrate 11, as shown in FIG.

[0210] The fifth stub conductor pattern 16B is arranged on the surface of the first dielectric substrate 11 at a position mirror-symmetrical to the third stub conductor pattern 14B with respect to the central axis of the signal conductor pattern 13A in the longitudinal direction (Y direction). The fifth stub conductor pattern 16B is composed of a thirteenth strip conductor pattern 16c and a fourteenth strip conductor pattern 16d. Between the fifth stub conductor pattern 16B and the ground conductor 12, it functions as a fifth capacitor for the fundamental wave of the high-frequency signal propagating through the signal conductor pattern 13A, and functions as a 1 / 4 wavelength open-end stub for the third harmonic of the fundamental wave.

[0211] The thirteenth strip conductor pattern 16c is a strip line formed on the surface of the first dielectric substrate 11, and constitutes a ninth stub transmission line via the ground conductor 12 and the first dielectric substrate 11. The thirteenth strip conductor pattern 16c is a linear conductor foil, such as a copper foil, having a length L4 (=L1×2 / 3) and a width W1.

[0212] One end of the thirteenth strip conductor pattern 16c is electrically connected to one side surface at one end of the first connection line portion 13A3 of the signal conductor pattern 13A, and the other end of the thirteenth strip conductor pattern 16c is an open end. The thirteenth strip conductor pattern 16c and the first connection line portion 13A3 of the signal conductor pattern 13A are an integrally formed conductor foil.

[0213] The thirteenth strip conductor pattern 16c is arranged on the surface of the first dielectric substrate 11 on an extension of the seventh strip conductor pattern 14c, and is perpendicular to the signal conductor pattern 13A. The connection portion between one end of the thirteenth strip conductor pattern 16c and the other side surface of the signal conductor pattern 13A is called a connection portion 13g. Since the width W1 of the 13th strip conductor pattern 16c is narrower than the width W, the area occupied by the connection portion 13g can be made smaller, and the influence of the area occupied by the connection portion 13g on the pass characteristics (frequency characteristics) of high-frequency signals propagating through the signal conductor pattern 13 is reduced.

[0214] The fourteenth strip conductor pattern 16d is a strip line formed on the surface of the first dielectric substrate 11, and constitutes a tenth stub transmission line via the ground conductor 12 and the first dielectric substrate 11. The fourteenth strip conductor pattern 16d is a linear conductor foil, such as a copper foil, having a length L5 (=L2×2 / 3) and a width W1.

[0215] Both ends of the fourteenth strip conductor pattern 16d are open ends, and the open end located at one end of the fourteenth strip conductor pattern 16d is disposed at a distance S from the other end of the thirteenth strip conductor pattern 16c. The fourteenth strip conductor pattern 16d is disposed on an extension of the thirteenth strip conductor pattern 16c. That is, the thirteenth strip conductor pattern 16c and the fourteenth strip conductor pattern 16d are arranged on a straight line in the X direction on the surface of the first dielectric substrate 11 with a gap S therebetween, as shown in FIG.

[0216] The sixth stub conductor pattern 16C is arranged on the surface of the first dielectric substrate 11 at a position mirror-symmetrical to the fourth stub conductor pattern 14C with respect to the central axis of the signal conductor pattern 13A in the longitudinal direction (Y direction). The sixth stub conductor pattern 16C is composed of a sixteenth strip conductor pattern 16e and a seventeenth strip conductor pattern 16f. Between the sixth stub conductor pattern 16C and the ground conductor 12, it functions as a sixth capacitor for the fundamental wave of the high-frequency signal propagating through the signal conductor pattern 13A, and functions as a 1 / 4 wavelength open-end stub for the third harmonic of the fundamental wave.

[0217] The sixteenth strip conductor pattern 16e is a strip line formed on the surface of the first dielectric substrate 11, and constitutes an eleventh stub transmission line via the ground conductor 12 and the first dielectric substrate 11. The sixteenth strip conductor pattern 16e is a linear conductor foil, such as a copper foil, having a length L4 (=L1×2 / 3) and a width W1.

[0218] One end of the sixteenth strip conductor pattern 16e is electrically connected to one side surface of the other end of the second connection line portion 13A4 of the signal conductor pattern 13A, and the other end of the sixteenth strip conductor pattern 16e is an open end. The sixteenth strip conductor pattern 16e and the second connection line portion 13A4 of the signal conductor pattern 13A are an integrally formed conductor foil.

[0219] The sixteenth strip conductor pattern 16e is arranged on the surface of the first dielectric substrate 11 on an extension of the seventh strip conductor pattern 14c, and is perpendicular to the signal conductor pattern 13A. The connection portion between one end of the sixteenth strip conductor pattern 16e and the other side surface of the signal conductor pattern 13A is called a connection portion 13h. Since the width W1 of the 16th strip conductor pattern 16e is narrower than the width W, the area occupied by the connection portion 13h can be made smaller, and the influence of the area occupied by the connection portion 13h on the pass characteristics (frequency characteristics) of high-frequency signals propagating through the signal conductor pattern 13 is reduced.

[0220] The seventeenth strip conductor pattern 16f is a strip line formed on the surface of the first dielectric substrate 11, and constitutes a twelfth stub transmission line via the ground conductor 12 and the first dielectric substrate 11. The seventeenth strip conductor pattern 16f is a linear conductor foil, such as a copper foil, having a length L5 (=L2×2 / 3) and a width W1.

[0221] Both ends of the seventeenth strip conductor pattern 16f are open ends, and the open end located at one end of the seventeenth strip conductor pattern 16f is disposed at a distance S from the other end of the sixteenth strip conductor pattern 16e. The seventeenth strip conductor pattern 16f is disposed on an extension of the sixteenth strip conductor pattern 16e. That is, the sixteenth strip conductor pattern 16e and the seventeenth strip conductor pattern 16f are arranged on a straight line in the X direction on the surface of the first dielectric substrate 11 with a gap S therebetween, as shown in FIG.

[0222] The sixth strip conductor pattern 23A of the second substrate 20 is disposed on the rear surface of the second dielectric substrate 21 so as to face the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b. That is, the sixth strip conductor pattern 23A is located directly above the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b.

[0223] As shown in FIG. 35, the sixth strip conductor pattern 23A is arranged at a position that is mirror-symmetrical to the third strip conductor pattern 22A with respect to the central axis in the longitudinal direction of the signal conductor pattern 13A. The sixth strip conductor pattern 23A is arranged on an extension of the third strip conductor pattern 22A at a distance equal to the width W2 of the first connecting line portion 13A3 and the second connecting line portion 13A4 of the signal conductor pattern 13A.

[0224] That is, the third strip conductor pattern 22A and the sixth strip conductor pattern 23A are arranged on a straight line in the X direction with a gap W2 therebetween. The sixth strip conductor pattern 23A is a linear conductor foil, such as a copper foil, having a length L3 (=L1+L2+S≈2×L1) and a width W1.

[0225] The sixth strip conductor pattern 23A is a strip conductor parallel to the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b, and forms a coupling line between the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b when there is a distance d between the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b and the electromagnetic field coupling ranges from tight coupling to loose coupling.

[0226] The width W1 of the fourth strip conductor pattern 16a, the fifth strip conductor pattern 16b, and the sixth strip conductor pattern 23A is narrow, and the coupling lines between the fourth strip conductor pattern 16a, the fifth strip conductor pattern 16b, and the sixth strip conductor pattern 23A have high characteristic impedance.

[0227] The sixth strip conductor pattern 23A, like the third strip conductor pattern 22A, is moved up and down within a range from a contact state with the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b (coupling degree k=1) to a state sufficiently separated (coupling degree k=0) by moving the second substrate 20 up and down.

[0228] The sixth strip conductor pattern 23A is moved up and down, so that the frequency of the second harmonic of the high-frequency signal propagating through the signal conductor pattern 13A is set to a lower limit frequency f 2L to the upper frequency f 2H The fourth strip conductor pattern 16a, the fifth strip conductor pattern 16b and the sixth strip conductor pattern 23A can function as adjustable quarter-wavelength open-circuit stubs for the conductor pattern 16a.

[0229] Furthermore, by moving the sixth strip conductor pattern 23A up and down, the resonance frequency of the high-frequency signal propagating through the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b reaches the lower limit frequency f 2L to the upper frequency f 2H By adjusting the capacitance of the second capacitor between the second stub conductor pattern 16A and the ground conductor 12 to the upper limit capacitance value C 2H to the lower limit capacitance value C 2L can be adjusted to.

[0230] The fifteenth strip conductor pattern 23B is disposed on the rear surface of the second dielectric substrate 21 so as to face the thirteenth strip conductor pattern 16c and the fourteenth strip conductor pattern 16d. That is, the fifteenth strip conductor pattern 23B is located directly above the thirteenth strip conductor pattern 16c and the fourteenth strip conductor pattern 16d.

[0231] As shown in FIG. 35, the fifteenth strip conductor pattern 23B is arranged at a position that is mirror-symmetrical to the ninth strip conductor pattern 22B with respect to the central axis in the longitudinal direction of the signal conductor pattern 13A. The fifteenth strip conductor pattern 23B is arranged on an extension of the ninth strip conductor pattern 22B at a distance equal to the width W2 of the first connection line portion 13A3 of the signal conductor pattern 13A.

[0232] That is, the ninth strip conductor pattern 22B and the fifteenth strip conductor pattern 23B are arranged on a straight line in the X direction with a gap W2 therebetween. The fifteenth strip conductor pattern 23B is a linear conductor foil, such as a copper foil, having a length L6 (=L4+L5+S≈2×L5) and a width W1.

[0233] The 15th strip conductor pattern 23B is a strip conductor parallel to the 13th strip conductor pattern 16c and the 14th strip conductor pattern 16d, and forms a coupling line between the 13th strip conductor pattern 16c and the 14th strip conductor pattern 16d when there is a distance d between the 13th strip conductor pattern 16c and the 14th strip conductor pattern 16d and the electromagnetic field coupling ranges from close coupling to loose coupling.

[0234] The width W1 of the 13th strip conductor pattern 16c, the 14th strip conductor pattern 16d, and the 15th strip conductor pattern 23B is narrow, and the coupling lines between the 13th strip conductor pattern 16c, the 14th strip conductor pattern 16d, and the 15th strip conductor pattern 23B have high characteristic impedance.

[0235] The 15th strip conductor pattern 23B, like the 9th strip conductor pattern 22B, is moved up and down within a range from contact with the 13th strip conductor pattern 16c and the 14th strip conductor pattern 16d (coupling degree k=1) to being sufficiently separated (coupling degree k=0) by moving the second substrate 20 up and down.

[0236] The fifteenth strip conductor pattern 23B is moved up and down, so that the frequency of the third harmonic of the high frequency signal propagating through the signal conductor pattern 13A is lower than the lower limit frequency f 3L to the upper frequency f 3H The thirteenth strip conductor pattern 16c, the fourteenth strip conductor pattern 16d and the fifteenth strip conductor pattern 23B can function as adjustable quarter-wavelength open-ended stubs for the .lambda.

[0237] Furthermore, by moving the fifteenth strip conductor pattern 23B up and down, the resonance frequency of the high-frequency signal propagating through the thirteenth strip conductor pattern 16c and the fourteenth strip conductor pattern 16d reaches the lower limit frequency f 2L to the upper frequency f 2H By adjusting the capacitance of the second capacitor between the second stub conductor pattern 16A and the ground conductor 12 to the upper limit capacitance value C 2H to the lower limit capacitance value C 2L can be adjusted to.

[0238] The eighteenth strip conductor pattern 23C is disposed on the rear surface of the second dielectric substrate 21 so as to face the sixteenth strip conductor pattern 16e and the seventeenth strip conductor pattern 16f. That is, the eighteenth strip conductor pattern 23C is located directly above the sixteenth strip conductor pattern 16e and the seventeenth strip conductor pattern 16f.

[0239] As shown in FIG. 35, the eighteenth strip conductor pattern 23C is arranged at a position that is mirror-symmetrical to the twelfth strip conductor pattern 22C with respect to the central axis in the longitudinal direction of the signal conductor pattern 13A. The eighteenth strip conductor pattern 23C is arranged on an extension of the twelfth strip conductor pattern 22C at a distance equal to the width W2 of the second connection line portion 13A4 of the signal conductor pattern 13A.

[0240] That is, the twelfth strip conductor pattern 22C and the eighteenth strip conductor pattern 23C are arranged on a straight line in the X direction with a gap W2 therebetween. The eighteenth strip conductor pattern 23C is a linear conductor foil, such as a copper foil, having a length L6 (=L4+L5+S≈2×L5) and a width W1.

[0241] The 18th strip conductor pattern 23C is a strip conductor parallel to the 16th strip conductor pattern 16e and the 17th strip conductor pattern 16f, and forms a coupled line between the 16th strip conductor pattern 16e and the 17th strip conductor pattern 16f when the electromagnetic field coupling is from tight coupling to loose coupling and there is a distance d between the 16th strip conductor pattern 16e and the 17th strip conductor pattern 16f.

[0242] The width W1 of the 16th strip conductor pattern 16e, the 17th strip conductor pattern 16f, and the 18th strip conductor pattern 23C is narrow, and the coupling lines between the 16th strip conductor pattern 16e, the 17th strip conductor pattern 16f, and the 18th strip conductor pattern 23C have high characteristic impedance.

[0243] The 18th strip conductor pattern 23C, like the 12th strip conductor pattern 22C, is moved up and down within a range from contact with the 16th strip conductor pattern 16e and the 17th strip conductor pattern 16f (coupling degree k=1) to being sufficiently separated (coupling degree k=0) by moving the second substrate 20 up and down.

[0244] The eighteenth strip conductor pattern 23C is moved up and down, so that the frequency of the triple harmonic of the high frequency signal propagating through the signal conductor pattern 13A is lower than the lower limit frequency f 3L to the upper frequency f 3H The sixteenth strip conductor pattern 16e, the seventeenth strip conductor pattern 16f and the eighteenth strip conductor pattern 23C can function as adjustable quarter-wavelength open-ended stubs for the conductor pattern 16a.

[0245] Furthermore, by moving the eighteenth strip conductor pattern 23C up and down, the resonance frequency of the high-frequency signal propagating through the sixteenth strip conductor pattern 16e and the seventeenth strip conductor pattern 16f reaches the lower limit frequency f 2L to the upper frequency f 2H By adjusting the capacitance of the second capacitor between the second stub conductor pattern 16A and the ground conductor 12 to the upper limit capacitance value C 2H to the lower limit capacitance value C 2L can be adjusted to.

[0246] In short, in the fourth embodiment, the fundamental wave of the high-frequency signal propagating through the signal conductor pattern 13A is affected by the two inductors connected in series between the connection portion 13e and the connection portion 13f by the first connection line portion 13A3 and the second connection line portion 13A4, the first capacitor of the variable capacitance C2 formed by the first stub conductor pattern 14A connected to the connection portion 13c, the fourth capacitor of the variable capacitance C2 connected to the connection portion 13d and formed by the second stub conductor pattern 16A electrically connected in parallel to the first capacitor, and the third stub conductor pattern 16A connected to the connection portion 13e. a second capacitor of variable capacitance C3 formed by the fifth stub conductor pattern 14B connected to the connecting portion 13g and electrically connected in parallel to the second capacitor; a third capacitor of variable capacitance C3 formed by the fourth stub conductor pattern 14C connected to the connecting portion 13f; and a sixth capacitor of variable capacitance C3 formed by the sixth stub conductor pattern 1cC connected to the connecting portion 13g and electrically connected in parallel to the third capacitor.

[0247] The low-pass filter configured in this manner has a lower limit frequency f corresponding to the distance d selected by moving the second substrate 20 up and down with respect to the frequency of the fundamental wave of the high-frequency signal propagating between the first input / output terminal 13a and the second input / output terminal 13b in the signal conductor pattern 13A. 1L to the upper frequency f 1H Since it can be mechanically adjusted to a frequency between f and m, the variable frequency range is wide relative to the fundamental frequency, and the cutoff frequency of the low-pass filter can be adjusted to the lower limit frequency f 1L to the upper frequency f 1H It can be adjusted with high precision within the range.

[0248] In the fourth embodiment, the stub transmission line based on the third strip conductor pattern 22A, the first strip conductor pattern 14a, and the second strip conductor pattern 14b, and the stub transmission line based on the sixth strip conductor pattern 23A, the fourth strip conductor pattern 16a, and the fifth strip conductor pattern 16b each have a lower limit frequency f corresponding to the distance d selected by moving the second substrate 20 up and down with respect to the frequency of the second harmonic of the fundamental wave in the high-frequency signal propagating between the first input / output terminal 13a and the second input / output terminal 13b in the signal conductor pattern 13A. 2L to the upper frequency f 2H Since the frequency can be mechanically adjusted to a range between 1 and 2, the variable frequency range is wide for the frequency of the double wave of the fundamental wave, and the propagation of the double wave of the fundamental wave propagating between the first input / output terminal 13a and the second input / output terminal 13b can be blocked with high precision.

[0249] In the fourth embodiment, the stub transmission line based on the ninth strip conductor pattern 22B, the seventh strip conductor pattern 14c, and the eighth strip conductor pattern 14d, and the stub transmission line based on the fifteenth strip conductor pattern 23B, the thirteenth strip conductor pattern 16c, and the fourteenth strip conductor pattern 16d each have a lower limit frequency f corresponding to the distance d selected by moving the second substrate 20 up and down with respect to the frequency of the triplet of the fundamental wave in the high-frequency signal propagating from the first input / output terminal 13a to the second input / output terminal 13b in the signal conductor pattern 13A. 3L to the upper frequency f 3H Since the frequency can be mechanically adjusted to a range between 1 and 2, the variable frequency range is wide for the frequency of the third harmonic of the fundamental wave, and the propagation of the third harmonic of the fundamental wave propagating from the first input / output terminal 13a to the second input / output terminal 13b can be blocked with high precision.

[0250] In the fourth embodiment, the stub transmission line based on the twelfth strip conductor pattern 22C, the tenth strip conductor pattern 14e, and the eleventh strip conductor pattern 14f, and the stub transmission line based on the eighteenth strip conductor pattern 23c, the sixteenth strip conductor pattern 16e, and the seventeenth strip conductor pattern 16f each have a lower limit frequency f corresponding to the distance d selected by vertically moving the second substrate 20 with respect to the frequency of the triple harmonic of the fundamental wave in the high-frequency signal propagating from the second input / output terminal 13b to the first input / output terminal 13a in the signal conductor pattern 13A. 3L to the upper frequency f 3H Since the frequency can be mechanically adjusted to a range between 1 and 2, the variable frequency range is wide for the frequency of the third harmonic of the fundamental wave, and the propagation of the third harmonic of the fundamental wave propagating from the second input / output terminal 13b to the first input / output terminal 13a can be blocked with high precision.

[0251] As described above, the high-frequency variable filter circuit according to the fourth embodiment has the same effects as the high-frequency variable filter circuit according to the third embodiment, and also reduces the influence on the pass characteristics (frequency characteristics) of high-frequency signals propagating through the signal conductor pattern 13A. As a result, the high-frequency variable filter circuit according to the fourth embodiment is suitable for use in the millimeter wave band where the propagation wavelength is short.

[0252] Another example 1 of the second substrate 20 in the high-frequency variable filter circuit according to the fourth embodiment The third strip conductor pattern 22A and the sixth strip conductor pattern 23A, the ninth strip conductor pattern 22B and the fifteenth strip conductor pattern 23B, and the twelfth strip conductor pattern 22C and the eighteenth strip conductor pattern 23C on the second substrate 20 may not be arranged in a straight line with the gap W2 between them, but may be formed continuously, filling the gap W2, as shown in FIG. 36.

[0253] That is, the third strip conductor pattern 22A of length L3 and the sixth strip conductor pattern 23A of length L3, which are arranged at positions mirror-symmetrical with respect to the longitudinal central axis of the signal conductor pattern 13A, are formed continuously in a straight line in the X direction on the rear surface of the second dielectric substrate 21 as a single strip conductor pattern of length (2×L3+W2).

[0254] In addition, a ninth strip conductor pattern 22B having a length of L6 and a fifteenth strip conductor pattern 23B having a length of L6, which are arranged at positions mirror-symmetrical with respect to the longitudinal central axis of the signal conductor pattern 13A, are formed continuously in a straight line in the X direction on the rear surface of the second dielectric substrate 21 as a single strip conductor pattern having a length of (2×L6+W2). Furthermore, a twelfth strip conductor pattern 22C having a length of L6 and an eighteenth strip conductor pattern 23C having a length of L6, which are arranged at positions mirror-symmetrical with respect to the longitudinal central axis of the signal conductor pattern 13A, are formed continuously in a straight line in the X direction on the rear surface of the second dielectric substrate 21 as a single strip conductor pattern having a length of (2×L6+W2).

[0255] Another example 2 of the second substrate 20 in the high-frequency variable filter circuit according to the fourth embodiment As shown in FIG. 37, the third strip conductor pattern 22A and the sixth strip conductor pattern 23A on the second substrate 20 may each have a length L3' (=L3-ΔL) that is shorter than the length L3 by ΔL.

[0256] Furthermore, the length of each of the ninth strip conductor pattern 22B and the fifteenth strip conductor pattern 23B, and the length of each of the twelfth strip conductor pattern 22C and the eighteenth strip conductor pattern 23C may be length L6' (=L6-ΔL), which is shorter than length L6 by ΔL, as shown in FIG. 37.

[0257] The length L3' is longer than the sum of the length L1 and the interval S, and is shorter than the sum of the length L1, the length L2, and the interval S. That is, the length L3' of the third strip conductor pattern 22A is such that when the distance d is 0, the third strip conductor pattern 22A is electrically connected to the first strip conductor pattern 14a and the second strip conductor pattern 14b, and when the distance d exceeds 0, the third strip conductor pattern 22A forms a first coupled line with the first strip conductor pattern 14a and forms a second coupled line with the second strip conductor pattern 14b.

[0258] The length L3' of the sixth strip conductor pattern 23A is such that when the distance d is 0, the sixth strip conductor pattern 23A is electrically connected to the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b, and when the distance d exceeds 0, the sixth strip conductor pattern 23A forms a third coupled line with the fourth strip conductor pattern 16a and a fourth coupled line with the fifth strip conductor pattern 16b.

[0259] Furthermore, the length L6' is longer than the sum of the length L4 and the interval S, and is shorter than the sum of the length L4, the length L5 and the interval S. That is, the length L6' of the ninth strip conductor pattern 22B is such that when the distance d is 0, the ninth strip conductor pattern 22B is electrically connected to the seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d, and when the distance d exceeds 0, the ninth strip conductor pattern 22B forms a fifth coupled line with the seventh strip conductor pattern 14c and a sixth coupled line with the eighth strip conductor pattern 14d.

[0260] The length L6' of the 15th strip conductor pattern 23B is such that when the distance d is 0, the 15th strip conductor pattern 23B is electrically connected to the 13th strip conductor pattern 16c and the 14th strip conductor pattern 16d, and when the distance d exceeds 0, the 15th strip conductor pattern 23B forms a ninth coupled line with the 13th strip conductor pattern 16c and a tenth coupled line with the 14th strip conductor pattern 16d.

[0261] The length L6´ of the 12th strip conductor pattern 22C is such that when the distance d is 0, the 12th strip conductor pattern 22C is electrically connected to the 10th strip conductor pattern 14e and the 11th strip conductor pattern 14f, and when the distance d exceeds 0, the 12th strip conductor pattern 22C forms a 7th coupling line between itself and the 10th strip conductor pattern 14e and forms an 8th coupling line between itself and the 11th strip conductor pattern 14f.

[0262] The length L6´ of the 18th strip conductor pattern 23C is such that when the distance d is 0, the 18th strip conductor pattern 23C is electrically connected to the 16th strip conductor pattern 16e and the 17th strip conductor pattern 16f, and when the distance d exceeds 0, the 18th strip conductor pattern 23C forms an 11th coupling line between itself and the 16th strip conductor pattern 16e and forms a 12th coupling line between itself and the 17th strip conductor pattern 16f.

[0263] L3´ is in the relationship of (L1 + S) < L3´ < (L1 + L2 + S = L3), and L6´ is in the relationship of (L4 + S) < L6´ < (L4 + L5 + S = L6). Also, ΔL is in a range that is sufficiently short compared to the propagation wavelength of the fundamental wave in the high-frequency signal, for example, ΔL is λ / 10 or less.

[0264] Furthermore, ΔL only needs to exceed the maximum allowable range of longitudinal misalignment (X direction) of the third strip conductor pattern 22A and the sixth strip conductor pattern 23A of the second substrate 20 relative to the first strip conductor pattern 14a and the fourth strip conductor pattern 16a of the first substrate 10, the longitudinal misalignment of the ninth strip conductor pattern 22B and the fifteenth strip conductor pattern 23B of the second substrate 20 relative to the seventh strip conductor pattern 14c and the thirteenth strip conductor pattern 16c of the first substrate 10, and the longitudinal misalignment of the twelfth strip conductor pattern 22C and the eighteenth strip conductor pattern 23C of the second substrate 20 relative to the tenth strip conductor pattern 14e and the sixteenth strip conductor pattern 16e of the first substrate 10. By setting ΔL in this way, the frequency characteristics of the variable resonator are not affected.

[0265] Another example 3 of the second substrate 20 in the high-frequency variable filter circuit according to the fourth embodiment As shown in Figure 38, the third strip conductor pattern 22A and the sixth strip conductor pattern 23A on the second substrate 20 do not have to be arranged in a straight line with a gap W2 between them, but may be formed continuously to fill the gap W2, and the lengths of the third strip conductor pattern 22A and the sixth strip conductor pattern 23A may each be a length L3' (= L3 - ΔL) that is ΔL shorter than the length L3.

[0266] Furthermore, the ninth strip conductor pattern 22B and the fifteenth strip conductor pattern 23B on the second substrate 20 may not be configured to be arranged in a straight line with a gap W2 between them, but may be formed continuously to fill the gap W2, and the lengths of the ninth strip conductor pattern 22B and the fifteenth strip conductor pattern 23B may each be a length L6' (=L6-ΔL) that is shorter than the length L6 by ΔL.

[0267] Furthermore, the 12th strip conductor pattern 22C and the 18th strip conductor pattern 23C may not be configured to be arranged in a straight line with a gap W2 between them, but may be formed continuously to fill the gap W2, and the lengths of the 12th strip conductor pattern 22C and the 18th strip conductor pattern 23C may each be a length L6' (=L6-ΔL) that is shorter than the length L6 by ΔL.

[0268] That is, the third strip conductor pattern 22A of length L3' (= L3 - ΔL) and the sixth strip conductor pattern 23A of length L3' (= L3 - ΔL), which are arranged at positions mirror-symmetrical with respect to the longitudinal central axis of the signal conductor pattern 13A, are formed continuously in a straight line in the X direction on the rear surface of the second dielectric substrate 21 as a single strip conductor pattern of length (2 × L3' (= L3 - ΔL) + W2).

[0269] A ninth strip conductor pattern 22B of length L6' (= L6-ΔL) and a fifteenth strip conductor pattern 23B of length L6' (= L6-ΔL), which are arranged at positions mirror-symmetrical with respect to the longitudinal central axis of the signal conductor pattern 13A, are formed continuously in a straight line in the X direction on the back surface of the second dielectric substrate 21 as a single strip conductor pattern of length (2×L6' (= L6-ΔL) + W2).

[0270] A twelfth strip conductor pattern 22C of length L6' (= L6-ΔL) and an eighteenth strip conductor pattern 23C of length L6' (= L6-ΔL), which are arranged at positions mirror-symmetrical with respect to the longitudinal central axis of the signal conductor pattern 13A, are formed continuously in a straight line in the X direction on the rear surface of the second dielectric substrate 21 as a single strip conductor pattern of length (2×L6' (= L6-ΔL) + W2).

[0271] Embodiment 5. A high-frequency variable filter circuit according to the fifth embodiment will be described with reference to FIGS. The high-frequency variable filter circuit of embodiment 5 differs from the high-frequency variable filter circuit of embodiment 4 in that a first matching strip conductor pattern 24 and a second matching strip conductor pattern 25 are arranged on the back surface of the second dielectric substrate 21, but is otherwise the same. In addition, in Figures 39 to 41, the same reference numerals as those in Figures 1 to 15, Figures 20 to 27, and Figures 33 to 35 indicate the same or corresponding parts.

[0272] The following description will focus on the first matching strip conductor pattern 24 and the second matching strip conductor pattern 25, which are differences from the high-frequency variable filter circuit according to the fourth embodiment. As shown in FIG. 41, the first matching strip conductor pattern 24 is arranged on the back surface of the second dielectric substrate 21 of the second substrate 20 with its central portion facing the first input / output line portion 13A1 of the signal conductor pattern 13A of the first substrate 10, and extending perpendicular to the first input / output line portion 13A1, i.e., in a direction (X direction) perpendicular to the longitudinal direction of the signal conductor pattern 13A.

[0273] The first matching strip conductor pattern 24 is arranged in parallel with the ninth strip conductor pattern 22B and the fifteenth strip conductor pattern 23B, and the distance between one side of the first matching strip conductor pattern 24 and the other side of the ninth strip conductor pattern 22B and the other side of the fifteenth strip conductor pattern 23B is L. y is. The first matching strip conductor pattern 24 has a length L x , a linear conductor foil having a width W1, such as a copper foil.

[0274] The central portion of the first matching strip conductor pattern 24 has the same length as the width of the first input / output line portion 13A1 of the signal conductor pattern 13A, and the left and right sides are arranged mirror-symmetrically with respect to the central portion. The length L of the first matching strip conductor pattern 24 xis shorter than the sum (2×L6) of the length L6 of the ninth strip conductor pattern 22B and the length L6 of the fifteenth strip conductor pattern 23B (L x <2×L6). The length L of the first matching strip conductor pattern 24 x is the lower limit frequency f of the fundamental wave of the high frequency signal propagating through the signal conductor pattern 13A. 1L The length is less than 1 / 6 of the propagation wavelength at

[0275] As shown in Figure 41, the second matching strip conductor pattern 25 is arranged on the back surface of the second dielectric substrate 21 in the second substrate 20 with its central portion facing the second input / output line portion 13A2 of the signal conductor pattern 13A in the first substrate 10, and extending perpendicular to the second input / output line portion 13A2, i.e., in a direction perpendicular to the longitudinal direction of the signal conductor pattern 13A.

[0276] The second matching strip conductor pattern 25 is arranged in parallel with the twelfth strip conductor pattern 22C and the eighteenth strip conductor pattern 23C, and the distance between the other side of the second matching strip conductor pattern 25 and one side of the twelfth strip conductor pattern 22C and one side of the eighteenth strip conductor pattern 23C is L. y is. The second matching strip conductor pattern 25 has a length L x , a linear conductor foil having a width W1, such as a copper foil.

[0277] The center portion of the second matching strip conductor pattern 25 has the same length as the width of the second input / output line portion 13A2 of the signal conductor pattern 13A, and the left and right sides are arranged mirror-symmetrically with respect to the center portion. The length L of the second matching strip conductor pattern 25 x is shorter than the sum (2×L6) of the length L6 of the twelfth strip conductor pattern 22C and the length L6 of the eighteenth strip conductor pattern 23C (L x <2×L6). The length L of the second matching strip conductor pattern 25 xis the lower limit frequency f of the fundamental wave of the high frequency signal propagating through the signal conductor pattern 13A. 1L The length is less than 1 / 6 of the propagation wavelength at

[0278] When the second substrate 20 is moved up and down relative to the first substrate 10 and the distance d between the surface of the conductor pattern arranged on the surface of the first substrate 10 and the surface of the conductor pattern arranged on the back surface of the second substrate 20 is zero (d=0), the center of the first matching strip conductor pattern 24 and the first input / output line portion 13A1 of the signal conductor pattern 13A come into physical contact and are electrically connected. Therefore, a capacitor formed by the first matching strip conductor pattern 24 and the ground conductor 12 is electrically connected to the intersection of the first input / output line portion 13A1 with the center portion of the first matching strip conductor pattern 24.

[0279] The capacitor formed by the first matching strip conductor pattern 24 and the ground conductor 12 has a lower limit frequency f of the fundamental wave of the high frequency signal propagating through the signal conductor pattern 13A when the distance d is zero. 1L The impedance is matched in a passband including The lower limit of the fundamental frequency, f 1L By matching the impedance in the passband including 1L The pass loss in the passband including

[0280] On the other hand, when the distance d is zero, the lower limit frequency f of the second harmonic of the fundamental wave of the high frequency signal propagating through the signal conductor pattern 13A is 2L and frequency f 2L The frequencies around the fundamental frequency f 3L and frequency f 3L The length of the first matching strip conductor pattern 24 is shorter than the sum of the length L6 of the ninth strip conductor pattern 22B and the length L6 of the fifteenth strip conductor pattern 23B, so the first matching strip conductor pattern 24 does not affect the frequency characteristics in the vicinity of the frequency including the ninth strip conductor pattern 22B. Therefore, the second and third harmonics of the fundamental wave in the high frequency signal propagating between the first input / output terminal 13a and the second input / output terminal 13b are prevented from passing through.

[0281] When the second substrate 20 is moved up and down relative to the first substrate 10, and the surfaces of the conductor patterns arranged on the surface of the first substrate 10 and the surfaces of the conductor patterns arranged on the back surface of the second substrate 20 are not in contact, but when the distance d is close to zero (d≒0), a parallel plate capacitor is formed between the center of the opposing first matching strip conductor pattern 24 and the first input / output line portion 13A1 of the signal conductor pattern 13A, and the parallel plate capacitor is electrically connected to the intersection of the first input / output line portion 13A1 with the center of the first matching strip conductor pattern 24.

[0282] The parallel plate capacitor is a fundamental frequency of a high frequency signal propagating through the signal conductor pattern 13A when the distance d is close to zero, that is, a lower limit frequency f 1L The impedance is matched in the passband including frequencies close to The lower limit of the fundamental frequency, f 1L By matching the impedance in the passband including frequencies close to 1L The pass loss in the passband including frequencies close to

[0283] The lower limit frequency f of the second harmonic of the fundamental wave in the high frequency signal propagating through the signal conductor pattern 13A when the distance d is close to zero. 2L and frequency f 2L The frequencies around the fundamental frequency f 3L and frequency f 3L The frequency characteristics at frequencies in the vicinity including 1000 Hz are also not affected by the first matching strip conductor pattern 24.

[0284] When the second substrate 20 is moved up and down relative to the first substrate 10, and the distance d between the surface of the conductor pattern arranged on the surface of the first substrate 10 and the surface of the conductor pattern arranged on the back surface of the second substrate 20 increases to the point where the parallel plate capacitor is no longer formed, the configuration becomes similar to that of the high-frequency variable filter circuit of embodiment 4.

[0285] Similarly, when the distance d is zero (d=0), the center portion of the second matching strip conductor pattern 25 and the second input / output line portion 13A2 of the signal conductor pattern 13A are in physical contact and are electrically connected. Therefore, a capacitor formed by the second matching strip conductor pattern 25 and the ground conductor 12 is electrically connected to the intersection of the second input / output line portion 13A2 with the center portion of the second matching strip conductor pattern 25.

[0286] The capacitor formed by the second matching strip conductor pattern 25 and the ground conductor 12 has a lower limit frequency f of the fundamental wave of the high frequency signal propagating through the signal conductor pattern 13A when the distance d is zero. 1L The impedance is matched in a passband including The lower limit of the fundamental frequency, f 1L By matching the impedance in the passband including 1L The pass loss in the passband including

[0287] On the other hand, when the distance d is zero, the lower limit frequency f of the second harmonic of the fundamental wave of the high frequency signal propagating through the signal conductor pattern 13A is 2L and frequency f 2L The frequencies around the fundamental frequency f 3L and frequency f 3L The second matching strip conductor pattern 25 does not affect the frequency characteristics in the vicinity of frequencies including 12C, 18C, 19C, 20C, 21C, 22C, 23C, because the length of the second matching strip conductor pattern 25 is shorter than the sum of the length L6 of the twelfth strip conductor pattern 22C and the length L6 of the eighteenth strip conductor pattern 23C. Therefore, the second and third harmonics of the fundamental wave in the high frequency signal propagating between the first input / output terminal 13a and the second input / output terminal 13b are prevented from passing through.

[0288] When the second substrate 20 is moved up and down relative to the first substrate 10 and the distance d is close to zero (d≒0), a parallel plate capacitor is formed between the center of the opposing second matching strip conductor pattern 25 and the second input / output line portion 13A2 of the signal conductor pattern 13A, and the parallel plate capacitor is electrically connected to the intersection of the second input / output line portion 13A2 with the center of the second matching strip conductor pattern 25.

[0289] The parallel plate capacitor is a fundamental frequency of a high frequency signal propagating through the signal conductor pattern 13A when the distance d is close to zero, that is, a lower limit frequency f 1L The impedance is matched in the passband including frequencies close to The lower limit of the fundamental frequency, f 1L By matching the impedance in the passband including frequencies close to 1L The pass loss in the passband including frequencies close to

[0290] The lower limit frequency f of the second harmonic of the fundamental wave in the high frequency signal propagating through the signal conductor pattern 13A when the distance d is close to zero. 2L and frequency f 2L The frequencies around the fundamental frequency f 3L and frequency f 3L The frequency characteristics at frequencies in the vicinity including 100 kHz are also not affected by the second matching strip conductor pattern 25.

[0291] When the second substrate 20 is moved up and down relative to the first substrate 10, and the distance d between the surface of the conductor pattern arranged on the surface of the first substrate 10 and the surface of the conductor pattern arranged on the back surface of the second substrate 20 increases to the point where the parallel plate capacitor is no longer formed, the configuration becomes similar to that of the high-frequency variable filter circuit of embodiment 4.

[0292] As described above, the high-frequency variable filter circuit according to the fifth embodiment has the same effects as the high-frequency variable filter circuit according to the fourth embodiment. In addition, by including the first matching strip conductor pattern 24 and the second matching strip conductor pattern 25, the lower limit frequency f of the fundamental wave of the high-frequency signal propagating through the signal conductor pattern 13A can be reduced. 1L and nearby frequencies (f 1m ≒f 1L ) by matching the impedance at the lower limit frequency f 1L The passband loss at frequencies near this frequency is reduced.

[0293] The first matching strip conductor pattern 24 and the second matching strip conductor pattern 25 may be provided in the high-frequency variable filter circuit according to the third embodiment. That is, in the third embodiment (see FIG. 24), a part of the first matching strip conductor pattern 24 faces the first input / output line portion 13A1 of the signal conductor pattern 13A on the first substrate 10, and is spaced apart from the ninth strip conductor pattern 22B by L. y The ninth strip conductor pattern 22B is formed of a linear conductor foil, for example, a copper foil, having a width W1 shorter than the length L6 of the ninth strip conductor pattern 22B. The length of the first matching strip conductor pattern 24 is set to a value equal to the lower limit frequency f of the fundamental wave of the high frequency signal propagating through the signal conductor pattern 13A. 1L The length is less than 1 / 6 of the propagation wavelength at

[0294] The second matching strip conductor pattern 25 is partially opposed to the second input / output line portion 13A2 of the signal conductor pattern 13A on the first substrate 10, and is spaced apart from the twelfth strip conductor pattern 22C by a distance L. y The twelfth strip conductor pattern 22C is formed of a linear conductor foil, for example, a copper foil, having a width W1 shorter than the length L6 of the twelfth strip conductor pattern 22C. The length of the second matching strip conductor pattern 25 is set to a value equal to the lower limit frequency f of the fundamental wave of the high frequency signal propagating through the signal conductor pattern 13A. 1L The length is less than 1 / 6 of the propagation wavelength at

[0295] The high-frequency variable filter circuit configured in this manner also has the same effect as that of the third embodiment. In addition, by providing the first matching strip conductor pattern 24 and the second matching strip conductor pattern 25, the lower limit frequency f of the fundamental wave of the high-frequency signal propagating through the signal conductor pattern 13A can be reduced. 1L and nearby frequencies (f 1m ≒f 1L ) by matching the impedance at the lower limit frequency f 1L The passband loss at frequencies near this frequency is reduced.

[0296] Another example 1 of the second substrate 20 in the high-frequency variable filter circuit according to the fifth embodiment The third strip conductor pattern 22A and the sixth strip conductor pattern 23A, the ninth strip conductor pattern 22B and the fifteenth strip conductor pattern 23B, and the twelfth strip conductor pattern 22C and the eighteenth strip conductor pattern 23C on the second substrate 20 may not be arranged in a straight line with the gap W2 between them, but may be formed continuously, filling the gap W2, as shown in FIG. 42.

[0297] That is, the third strip conductor pattern 22A of length L3 and the sixth strip conductor pattern 23A of length L3, which are arranged at positions mirror-symmetrical with respect to the longitudinal central axis of the signal conductor pattern 13A, are formed continuously in a straight line in the X direction on the rear surface of the second dielectric substrate 21 as a single strip conductor pattern of length (2×L3+W2). In addition, a ninth strip conductor pattern 22B having a length of L6 and a fifteenth strip conductor pattern 23B having a length of L6, which are arranged at positions mirror-symmetrical with respect to the longitudinal central axis of the signal conductor pattern 13A, are formed continuously in a straight line in the X direction on the rear surface of the second dielectric substrate 21 as a single strip conductor pattern having a length of (2×L6+W2).

[0298] Furthermore, a twelfth strip conductor pattern 22C having a length of L6 and an eighteenth strip conductor pattern 23C having a length of L6, which are arranged at positions mirror-symmetrical with respect to the longitudinal central axis of the signal conductor pattern 13A, are formed continuously in a straight line in the X direction on the rear surface of the second dielectric substrate 21 as a single strip conductor pattern having a length of (2×L6+W2).

[0299] It should be noted that the embodiments may be freely combined, or any of the components in each embodiment may be modified, or any of the components in each embodiment may be omitted. [Industrial Applicability]

[0300] The variable resonator according to the present disclosure is suitable for use as a variable resonator in a high-frequency variable filter circuit used in communication equipment in microwave and millimeter wave communication systems. Furthermore, the high-frequency variable filter circuit according to the present disclosure is suitable for use in communication devices in microwave and millimeter-wave communication systems, and is particularly preferably applied as a low-pass filter. [Explanation of symbols]

[0301] 10 first substrate, 11 first dielectric substrate, 12 ground conductor, 13, 13A signal conductor pattern, 13A1 first input / output line portion, 13A2 second input / output line portion, 13A3 first connection line portion, 13A4 second connection line portion, 14 stub conductor pattern, 14A first stub conductor pattern, 14B third stub conductor pattern, 14C fourth stub conductor pattern, 14a first strip conductor pattern, 14b second strip conductor pattern, 14c seventh strip conductor pattern, 14d eighth strip conductor pattern, 14e tenth strip conductor pattern, 14f eleventh strip conductor pattern, 15 stub transmission line, 16 second stub conductor pattern, 16A second stub conductor pattern, 16B fifth stub conductor pattern, 16C sixth stub conductor pattern, 16a 4th strip conductor pattern, 16b 5th strip conductor pattern, 16c 13th strip conductor pattern, 16d 14th strip conductor pattern, 16e 16th strip conductor pattern, 16f 17th strip conductor pattern, 20 second substrate, 21 second dielectric substrate, 22, 22A 3rd strip conductor pattern, 22B 9th strip conductor pattern, 22C 12th strip conductor pattern, 23, 23A 6th strip conductor pattern, 23B 15th strip conductor pattern, 23C 18th strip conductor pattern, 24 first matching strip conductor pattern, 25 second matching strip conductor pattern, 30 movable plate.

Claims

1. a first substrate having a first dielectric substrate, a ground conductor arranged on a rear surface of the first dielectric substrate, a signal conductor pattern arranged on a front surface of the first dielectric substrate, a first strip conductor pattern arranged on the front surface of the first dielectric substrate and having one end electrically connected to one side of the signal conductor pattern, and a second strip conductor pattern arranged on the front surface of the first dielectric substrate at a distance from the other end of the first strip conductor pattern; a second substrate having a second dielectric substrate and a third strip conductor pattern disposed on a rear surface of the second dielectric substrate so as to face the first strip conductor pattern and the second strip conductor pattern; a movable plate connected to the front surface of the second substrate, movable in the front-back direction of the second substrate by a movable mechanism for moving the second substrate in the front-back direction, and for adjusting the distance between the front surface of the first substrate and the back surface of the second substrate; A variable resonator comprising:

2. The length L of the first strip conductor pattern １ is a length of ¼ of a propagation wavelength at an upper limit frequency at which propagation of a high frequency signal propagating through the signal conductor pattern is blocked, The length L of the third strip conductor pattern ３ is a quarter of the propagation wavelength of a lowest frequency at which propagation of a high-frequency signal propagating through the signal conductor pattern is blocked, The length L of the second strip conductor pattern ２ However, the length L ３ from the length L １ and the sum of the distance S between the other end of the first strip conductor pattern and one end of the second strip conductor pattern, The variable resonator according to claim 1 .

3. 3. The variable resonator according to claim 2, wherein the upper limit frequency is twice the lower limit frequency.

4. the first substrate has a fourth strip conductor pattern disposed on a surface of the first dielectric substrate, one end of which is electrically connected to the other side of the signal conductor pattern, and a fifth strip conductor pattern disposed on the surface of the first dielectric substrate at a distance from the other end of the fourth strip conductor pattern; the second substrate has a sixth strip conductor pattern disposed on a rear surface of the second dielectric substrate so as to face the fourth strip conductor pattern and the fifth strip conductor pattern; The variable resonator according to any one of claims 1 to 3.

5. the length of the fourth strip conductor pattern is the same as the length of the first strip conductor pattern; the length of the fifth strip conductor pattern is the same as the length of the second strip conductor pattern; the length of the sixth strip conductor pattern is the same as the length of the third strip conductor pattern; The variable resonator according to claim 4 .

6. the fourth strip conductor pattern and the fifth strip conductor pattern are arranged in mirror symmetry with respect to the central axis in the longitudinal direction of the first strip conductor pattern and the second strip conductor pattern and the signal conductor pattern; The variable resonator according to claim 5 .

7. The variable resonator according to claim 6 , wherein the third strip conductor pattern and the sixth strip conductor pattern are arranged on a straight line.

8. 8. The variable resonator according to claim 7, wherein the third strip conductor pattern and the sixth strip conductor pattern are formed continuously.

9. the first substrate has a fourth strip conductor pattern disposed on a surface of the first dielectric substrate, one end of which is electrically connected to the other side of the signal conductor pattern, and a fifth strip conductor pattern disposed on the surface of the first dielectric substrate at a distance from the other end of the fourth strip conductor pattern; the second substrate has a sixth strip conductor pattern disposed on a rear surface of the second dielectric substrate so as to face the fourth strip conductor pattern and the fifth strip conductor pattern; The length L of each of the first strip conductor pattern and the fourth strip conductor pattern １ is a length of ¼ of a propagation wavelength at an upper limit frequency at which propagation of a high frequency signal propagating through the signal conductor pattern is blocked, The length of each of the second strip conductor pattern and the fifth strip conductor pattern is L ２ Then, The length L of each of the third strip conductor pattern and the sixth strip conductor pattern ３ However, the length L １ and the sum of the distance S between the other end of the first strip conductor pattern and one end of the second strip conductor pattern, and the length L １ and the length L ２ and the interval S, The variable resonator according to claim 1 .

10. a first substrate which is a microstrip substrate having a first dielectric substrate, a ground conductor arranged on a rear surface of the first dielectric substrate, a signal conductor pattern arranged on a front surface of the first dielectric substrate, and a stub conductor pattern arranged on the front surface of the first dielectric substrate, one end of which is electrically connected to the signal conductor pattern; a second dielectric substrate whose back surface is disposed opposite to the front surface of the first dielectric substrate, and a coupling adjusting conductor pattern on the back surface of the second dielectric substrate for adjusting a coupling degree, which is a ratio of electromagnetic field coupling with the stub conductor pattern, the second substrate being a coupling adjusting substrate that can be moved up and down relative to the first substrate; A variable resonator comprising:

11. a first dielectric substrate; a ground conductor disposed on a rear surface of the first dielectric substrate; a signal conductor pattern disposed on a front surface of the first dielectric substrate and having a first input / output line portion, a first connection line portion, a second connection line portion, and a second input / output line portion connected in sequence; a first strip conductor pattern disposed on the front surface of the first dielectric substrate and having one end electrically connected to one side of a junction between the other end of the first connection line portion and one end of the second connection line portion of the signal conductor pattern; a second strip conductor pattern disposed on the front surface of the first dielectric substrate at a distance from the other end of the first strip conductor pattern; a first substrate having a seventh strip conductor pattern disposed on the surface of the first dielectric substrate, one end of which is electrically connected to one side surface of one end of a first connection line portion of the signal conductor pattern; an eighth strip conductor pattern disposed on the surface of the first dielectric substrate and spaced apart from the other end of the seventh strip conductor pattern; a tenth strip conductor pattern disposed on the surface of the first dielectric substrate, one end of which is electrically connected to one side surface of the other end of a second connection line portion of the signal conductor pattern; and an eleventh strip conductor pattern disposed on the surface of the first dielectric substrate and spaced apart from the other end of the tenth strip conductor pattern; a second substrate having a second dielectric substrate, a third strip conductor pattern disposed on a rear surface of the second dielectric substrate so as to face the first strip conductor pattern and the second strip conductor pattern, a ninth strip conductor pattern disposed on a rear surface of the second dielectric substrate so as to face the seventh strip conductor pattern and the eighth strip conductor pattern, and a twelfth strip conductor pattern disposed on a rear surface of the second dielectric substrate so as to face the tenth strip conductor pattern and the eleventh strip conductor pattern; a movable plate connected to the front surface of the second substrate, movable in the front-back direction of the second substrate by a movable mechanism for moving the second substrate in the front-back direction, and for adjusting the distance between the front surface of the first substrate and the back surface of the second substrate; A high-frequency variable filter circuit comprising:

12. The length L of the first strip conductor pattern １ is a length of ¼ of a propagation wavelength at an upper limit frequency at which propagation of a high frequency signal propagating through the signal conductor pattern is blocked, The length L of the third strip conductor pattern ３ is a quarter of the propagation wavelength of a lowest frequency at which propagation of a high-frequency signal propagating through the signal conductor pattern is blocked, The length L of the second strip conductor pattern ２ However, the length L ３ from the length L １ and the sum of the distance S between the other end of the first strip conductor pattern and one end of the second strip conductor pattern, The length L of each of the seventh strip conductor pattern and the tenth strip conductor pattern ４ is the length L １ is two-thirds the length of The length L of each of the ninth strip conductor pattern and the twelfth strip conductor pattern ６ is the length L ３ is two-thirds the length of The length L of the eighth strip conductor pattern ５ is the length L ６ from the length L ４ and the sum of the distance S between the other end of the seventh strip conductor pattern and one end of the eighth strip conductor pattern, The length L of the eleventh strip conductor pattern ５ is the length L ６ from the length L ４ and the sum of the distance S between the other end of the ninth strip conductor pattern and one end of the eleventh strip conductor pattern, The high-frequency variable filter circuit according to claim 11.

13. 13. The high-frequency variable filter circuit according to claim 12, wherein the high-frequency signal whose propagation is blocked among the high-frequency signals propagating through the signal conductor pattern is a second harmonic of the fundamental wave of the high-frequency signal propagating through the signal conductor pattern.

14. 13. The high-frequency variable filter circuit according to claim 12, wherein the upper limit frequency is twice the lower limit frequency.

15. 15. The high-frequency variable filter circuit according to claim 11, wherein the second substrate has a first matching strip conductor pattern disposed on a rear surface of the second dielectric substrate so as to face a first input / output line portion of the signal conductor pattern, and a second matching strip conductor pattern disposed on the rear surface of the second dielectric substrate so as to face a second input / output line portion of the signal conductor pattern.

16. 16. The high-frequency variable filter circuit according to claim 15, wherein the length of each of the first matching strip conductor pattern and the second matching strip conductor pattern is less than 1 / 6 of the propagation wavelength at a lower limit frequency of the fundamental wave of the high-frequency signal propagating through the signal conductor pattern.

17. the first substrate has: a fourth strip conductor pattern disposed on the surface of the first dielectric substrate, one end of which is electrically connected to the other side of a junction between the other end of the first connection line portion and one end of the second connection line portion of the signal conductor pattern; a fifth strip conductor pattern disposed on the surface of the first dielectric substrate and spaced apart from the other end of the fourth strip conductor pattern; a thirteenth strip conductor pattern disposed on the surface of the first dielectric substrate, one end of which is electrically connected to the other side of the one end of the first connection line portion of the signal conductor pattern; a fourteenth strip conductor pattern disposed on the surface of the first dielectric substrate and spaced apart from the other end of the thirteenth strip conductor pattern; a sixteenth strip conductor pattern disposed on the surface of the first dielectric substrate, one end of which is electrically connected to the other side of the other end of the second connection line portion of the signal conductor pattern; and a seventeenth strip conductor pattern disposed on the surface of the first dielectric substrate and spaced apart from the other end of the sixteenth strip conductor pattern; the second substrate has a sixth strip conductor pattern arranged opposite the fourth strip conductor pattern and the fifth strip conductor pattern on a rear surface of the second dielectric substrate, a fifteenth strip conductor pattern arranged opposite the thirteenth strip conductor pattern and the fourteenth strip conductor pattern on a rear surface of the second dielectric substrate, and an eighteenth strip conductor pattern arranged opposite the sixteenth strip conductor pattern and the seventeenth strip conductor pattern on a rear surface of the second dielectric substrate; 15. The high-frequency variable filter circuit according to claim 11.

18. the length of the fourth strip conductor pattern is the same as the length of the first strip conductor pattern; the length of the fifth strip conductor pattern is the same as the length of the second strip conductor pattern; the length of the sixth strip conductor pattern is the same as the length of the third strip conductor pattern; the length of the thirteenth strip conductor pattern is the same as the length of the seventh strip conductor pattern; the length of the fourteenth strip conductor pattern is the same as the length of the eighth strip conductor pattern; the length of the fifteenth strip conductor pattern is the same as the length of the ninth strip conductor pattern; the length of the sixteenth strip conductor pattern is the same as the length of the tenth strip conductor pattern; the length of the seventeenth strip conductor pattern is the same as the length of the eleventh strip conductor pattern; The length of the eighteenth strip conductor pattern is the same as the length of the twelfth strip conductor pattern.

18. The high-frequency variable filter circuit according to claim 17.

19. the fourth strip conductor pattern and the fifth strip conductor pattern are arranged in mirror symmetry with the first strip conductor pattern and the second strip conductor pattern with respect to a central axis in the longitudinal direction of the signal conductor pattern 13; the thirteenth strip conductor pattern and the fourteenth strip conductor pattern are arranged in mirror symmetry with the seventh strip conductor pattern and the eighth strip conductor pattern with respect to a central axis in the longitudinal direction of the signal conductor pattern 13; the sixteenth strip conductor pattern and the seventeenth strip conductor pattern are arranged in mirror symmetry with the tenth strip conductor pattern and the eleventh strip conductor pattern with respect to a central axis in the longitudinal direction of the signal conductor pattern 13; 19. The high-frequency variable filter circuit according to claim 18.

20. the third strip conductor pattern and the sixth strip conductor pattern are arranged on a straight line, the ninth strip conductor pattern and the fifteenth strip conductor pattern are arranged on a straight line, the twelfth strip conductor pattern and the eighteenth strip conductor pattern are arranged on a straight line.

20. The high-frequency variable filter circuit according to claim 19.

21. the third strip conductor pattern and the sixth strip conductor pattern are formed continuously, the ninth strip conductor pattern and the fifteenth strip conductor pattern are formed continuously, the twelfth strip conductor pattern and the eighteenth strip conductor pattern are formed continuously; 21. The high-frequency variable filter circuit according to claim 20.

22. the first substrate has: a fourth strip conductor pattern disposed on the surface of the first dielectric substrate, one end of which is electrically connected to the other side of a junction between the other end of the first connection line portion and one end of the second connection line portion of the signal conductor pattern; a fifth strip conductor pattern disposed on the surface of the first dielectric substrate and spaced apart from the other end of the fourth strip conductor pattern; a thirteenth strip conductor pattern disposed on the surface of the first dielectric substrate, one end of which is electrically connected to the other side of the one end of the first connection line portion of the signal conductor pattern; a fourteenth strip conductor pattern disposed on the surface of the first dielectric substrate and spaced apart from the other end of the thirteenth strip conductor pattern; a sixteenth strip conductor pattern disposed on the surface of the first dielectric substrate, one end of which is electrically connected to the other side of the other end of the second connection line portion of the signal conductor pattern; and a seventeenth strip conductor pattern disposed on the surface of the first dielectric substrate and spaced apart from the other end of the sixteenth strip conductor pattern; the second substrate has, on a rear surface of the second dielectric substrate, a sixth strip conductor pattern arranged opposite the fourth strip conductor pattern and the fifth strip conductor pattern, a fifteenth strip conductor pattern arranged opposite the thirteenth strip conductor pattern and the fourteenth strip conductor pattern, and an eighteenth strip conductor pattern arranged opposite the sixteenth strip conductor pattern and the seventeenth strip conductor pattern, The length L of each of the first strip conductor pattern and the fourth strip conductor pattern １ is a length of ¼ of a propagation wavelength at an upper limit frequency at which propagation of a high frequency signal propagating through the signal conductor pattern is blocked, The length of each of the second strip conductor pattern and the fifth strip conductor pattern is L ２ Then, The length L of each of the third strip conductor pattern and the sixth strip conductor pattern ３ However, the length L １ and the sum of the distance S between the other end of the first strip conductor pattern and one end of the second strip conductor pattern, and the length L １ and the length L ２ and the interval S, The length L of each of the seventh strip conductor pattern, the thirteenth strip conductor pattern, the tenth strip conductor pattern, and the sixteenth strip conductor pattern ４ is the length L １ is two-thirds the length of The lengths of the eighth strip conductor pattern, the fourteenth strip conductor pattern, the eleventh strip conductor pattern, and the seventeenth strip conductor pattern are defined as L ５ Then, The length L of each of the ninth strip conductor pattern and the fifteenth strip conductor pattern ６ However, the length L ４ and the sum of the distance S between the other end of the seventh strip conductor pattern and one end of the eighth strip conductor pattern, and the length L ４ and the length L ５ and the interval S, The length L of each of the twelfth strip conductor pattern and the eighteenth strip conductor pattern ６ However, the length L ４ and the distance S between the other end of the eleventh strip conductor pattern and one end of the eleventh strip conductor pattern, and the length L ４ and the length L ５ and the interval S, The high-frequency variable filter circuit according to claim 12.

23. 18. The high-frequency variable filter circuit according to claim 17, wherein the second substrate has a first matching strip conductor pattern disposed on a rear surface of the second dielectric substrate, the first matching strip conductor pattern having a central portion facing a first input / output line portion of the signal conductor pattern and orthogonal to the first input / output line portion, and a second matching strip conductor pattern disposed on a rear surface of the second dielectric substrate, the second matching strip conductor pattern having a central portion facing a second input / output line portion of the signal conductor pattern and orthogonal to the second input / output line portion.

24. 24. The high-frequency variable filter circuit according to claim 23, wherein the length of each of the first matching strip conductor pattern and the second matching strip conductor pattern is less than 1 / 6 of the propagation wavelength at a lower limit frequency of the fundamental wave of the high-frequency signal propagating through the signal conductor pattern.

25. a length of the first matching strip conductor pattern is shorter than the sum of the lengths of the ninth strip conductor pattern and the fifteenth strip conductor pattern; the length of the second matching strip conductor pattern is shorter than the sum of the lengths of the twelfth strip conductor pattern and the eighteenth strip conductor pattern; 24. The high-frequency variable filter circuit according to claim 23.

26. a first dielectric substrate; a ground conductor disposed on a rear surface of the first dielectric substrate; and a signal conductor pattern disposed on a front surface of the first dielectric substrate, the signal conductor pattern having a first input / output line portion, a first connecting line portion, a second connecting line portion, and a second input / output line portion connected in sequence; a first substrate having: a first stub conductor pattern disposed on a surface of the first dielectric substrate, one end of which is electrically connected to a junction between the other end of the first connection line portion and one end of the second connection line portion of the signal conductor pattern, for blocking passage of second harmonics in a high-frequency signal propagating through the signal conductor pattern; a second stub conductor pattern disposed on the surface of the first dielectric substrate, one end of which is electrically connected to one end of the first connection line portion of the signal conductor pattern, for blocking passage of second harmonics in a high-frequency signal propagating through the signal conductor pattern; and a third stub conductor pattern disposed on the surface of the first dielectric substrate, one end of which is electrically connected to the other end of the second connection line portion of the signal conductor pattern, for blocking passage of third harmonics in a high-frequency signal propagating through the signal conductor pattern; a second substrate, which is a coupling adjusting substrate, and which is movable up and down relative to the first substrate, the second substrate having a back surface disposed opposite to the front surface of the first dielectric substrate, a first coupling adjusting conductor pattern on the back surface of the second dielectric substrate for adjusting a coupling degree which is a ratio of electromagnetic field coupling with the first stub conductor pattern, a second coupling adjusting conductor pattern on the back surface of the second dielectric substrate for adjusting a coupling degree which is a ratio of electromagnetic field coupling with the second stub conductor pattern, and a third coupling adjusting conductor pattern on the back surface of the second dielectric substrate for adjusting a coupling degree which is a ratio of electromagnetic field coupling with the third stub conductor pattern; A high-frequency variable filter circuit comprising:

Images