Variable resonator and high-frequency variable filter circuit

Abstract

This variable resonator comprises: a first substrate (10) having a first dielectric substrate (11), a ground conductor (12) disposed on the back surface of the first dielectric substrate (11), a signal conductor pattern (13) disposed on the front surface of the first dielectric substrate (11), a first strip conductor pattern (14a) disposed on the front surface of the first dielectric substrate (11) and having one end electrically connected to one side surface of the signal conductor pattern (13), and a second strip conductor pattern (14b) disposed on the front surface of the first dielectric substrate (11) spaced apart at an interval from the other end of the first strip conductor pattern (14a); a second substrate (20) having a second dielectric substrate (21) and a third strip conductor pattern (22) disposed on the back surface of the second dielectric substrate (21) so as to face the first strip conductor pattern (14a) and the second strip conductor pattern (14b); and a movable plate (30) that is connected to the front surface of the second substrate (20), is movable in the front-back direction of the second substrate (20) by a movable mechanism for moving the second substrate (20) in the front-back direction, and is for adjusting the distance between the front surface of the first substrate (10) and the back surface of the second substrate (20).

Description

Variable resonator and high-frequency variable filter circuit

[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.

[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 a mechanically tunable 2 GHz low-pass filter is described in Non-Patent Document 1. The low-pass filter shown in Non-Patent Document 1 is configured by a combination of a series inductor and three shunt capacitors, and includes 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.

[0003] 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

[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, converting to a ratio of only about 33%. In other words, the variable range of frequencies that are blocked within the 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.

[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.

[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.

[0008] 5 is an exploded perspective view showing a variable resonator according to a first embodiment. 6 is a plan view showing a first substrate in the variable resonator according to the first embodiment, as seen from the front surface. 7 is a plan perspective view showing a second substrate in the variable resonator according to the first embodiment, as seen from the front surface. 8 is a perspective perspective view showing a variable resonator according to the first embodiment. 9 is a plan view showing a variable resonator according to the first embodiment, as seen from the front surface. 10 is a right side perspective view showing a variable resonator according to the first embodiment. 11 is a front perspective view showing a variable resonator according to the first embodiment. 12 is a partial enlarged view of the II-II cross section of FIG. 10. 13 is a circuit diagram showing an equivalent circuit of the variable resonator according to the first embodiment. 14 is a circuit diagram showing an equivalent circuit of the variable resonator according to the first embodiment. 15 is a perspective perspective view showing a variable resonator according to a second embodiment. 16 is a plan view showing a variable resonator according to the second embodiment, as seen from the front surface. 17 is a plan view showing a first substrate in the variable resonator according to the second embodiment, as seen from the front surface. 18 is a plan perspective view showing a second substrate in the variable resonator according to the second embodiment, as seen from the front surface. 19 is a circuit diagram showing an equivalent circuit according to the second embodiment. 22. FIG. 23 is a planar perspective view, seen from the front, illustrating another example 1 of the second substrate in the variable resonator according to embodiment 2. FIG. 24 is a planar perspective view, seen from the front, illustrating another example 2 of the second substrate in the variable resonator according to embodiment 2. FIG. 25 is a planar perspective view, seen from the front, illustrating another example 3 of the second substrate in the variable resonator according to embodiment 2. FIG. 26 is an exploded oblique perspective view showing a high-frequency variable filter circuit according to embodiment 3. FIG. 27 is a perspective perspective view showing a variable resonator according to embodiment 3. FIG. 28 is a plan view, seen from the front, illustrating the high-frequency variable filter circuit according to embodiment 3. FIG. 29 is a plan view, seen from the front, illustrating the first substrate in the high-frequency variable filter circuit according to embodiment 3. FIG. 29 is a planar perspective view, seen from the front, illustrating the second substrate in the high-frequency variable filter circuit according to embodiment 3. FIG. 29 is a partial enlarged view of the III-III cross section of FIG. 22. FIG. 29 is a partial enlarged view of the IV-IV cross section of FIG. 22. FIG. 29 is a partial enlarged view of the V-V cross section and the VI-VI cross section of FIG. 22. FIG. 29 is a circuit diagram showing an equivalent circuit of the variable resonator according to embodiment 3. FIG. 11 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.1 is a circuit diagram showing an equivalent circuit representing operation at the frequency of the third harmonic (triple wave) of the fundamental wave in the variable resonator according to embodiment 3. FIG. 2 is a circuit diagram showing an equivalent circuit representing operation in the variable resonator according to embodiment 3 near the cutoff frequency through which the fundamental wave passes. FIG. 3 is a perspective perspective view showing a high-frequency variable filter circuit according to embodiment 4. FIG. 4 is a plan view showing a first substrate in the variable resonator according to embodiment 4, as seen from the front surface. FIG. 5 is a plan view showing a second substrate in the variable resonator according to embodiment 4, as seen from the front surface. FIG. 6 is a plan view showing another example 1 of the second substrate in the variable resonator according to embodiment 4, as seen from the front surface. FIG. 7 is a plan view showing another example 2 of the second substrate in the variable resonator according to embodiment 4, as seen from the front surface. FIG. 8 is a perspective perspective view showing a high-frequency variable filter circuit according to embodiment 5. FIG. 9 is a plan view showing a first substrate in the variable resonator according to embodiment 5, as seen from the front surface. FIG. 10 is a plan view showing a second substrate in the variable resonator according to embodiment 5, as seen from the front surface. FIG. 13 is a planar perspective view seen from the front side showing another example 1 of the second substrate in the variable resonator according to the fifth embodiment.

[0009] Embodiment 1. A variable resonator according to embodiment 1 will be described with reference to Figures 1 to 11. The variable resonator according to embodiment 1 is 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 frequencies can be mechanically adjusted. As shown in Figures 1 to 9, the variable resonator according to embodiment 1 includes a first substrate 10, a second substrate 20, and a movable plate 30.

[0010] The first substrate 10 is a microstrip substrate having a microstrip line that transmits a high-frequency signal composed of electromagnetic waves. The first substrate 10 has a first dielectric substrate 11, a ground conductor 12, a signal conductor pattern 13, and a stub conductor pattern 14. For convenience, in the figure, 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 copper foil, formed on the back surface of the flat first dielectric substrate 11, for example, on the entire back surface in Fig. 1. The signal conductor pattern 13 is a microstrip line formed on the front 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 conductive foil, such as copper foil, having a width W.

[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. Note that 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 end 13a may refer to a first input / output terminal that is 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 end 13b may refer to a second input / output terminal that is 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 has a length L １The conductive foil is a linear conductive foil, such as a copper foil.

[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 an integrally formed conductor foil, 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 14a is disposed on the surface of the first dielectric substrate 11, perpendicular to the signal conductor pattern 13. The connection portion between one end of the first strip conductor pattern 14a and the side 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 has a length L ２ The conductive foil is a linear conductive foil, such as a copper foil.

[0018] Both ends of the second strip conductor pattern 14b are open, and one open end of the second strip conductor pattern 14b is arranged with a gap S between it and the other end of the first strip conductor pattern 14a. The second strip conductor pattern 14b is arranged 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 with a gap S between them on the surface of the first dielectric substrate 11, as shown in FIG. 2 .

[0019] The width W of the first strip conductor pattern 14a is the same as the width W of the second strip conductor pattern 14b. 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 degree of coupling, which is the rate of electromagnetic 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 (moved 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 of the second substrate 20 and the front surface of the flat first dielectric substrate 11 of the first substrate 10 are disposed opposite to each other, and the second substrate 20 is moved up and down with the front surface of the first substrate 10 as a reference. Note that, although in the first embodiment, the second substrate 20 is moved up and down with respect to the first substrate 10, the first substrate 10 may also be moved up and down with the back surface of the second substrate 20 as a reference.

[0023] The key 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 movable plate 30 to move the movable plate 30 up and down.

[0024] When an actuator is used, the distance d is set to zero (d = 0) by the weight of the actuator when the actuator is freed, making it easy to obtain the electrical origin. 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 coupling degree adjusting conductor pattern for adjusting the coupling degree 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 arranged on the rear surface of the second dielectric substrate 21, facing the first strip conductor pattern 14 a and the second strip conductor pattern 14 b.

[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 has a length L ３ The conductive foil is a linear conductive foil, such as a copper foil.

[0027] Length L of the third strip conductor pattern 22 ３ is the length L of the first strip conductor pattern 14a as shown in FIG. １ and the length L of the second strip conductor pattern 14b. ２ and the spacing S between the first strip conductor pattern 14a and the second strip conductor pattern 14b. 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, as shown in FIG.

[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 close 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 when the distance d is approximately 0, that is, at 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 the first strip conductor pattern 14a and the second strip conductor pattern 14b (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 and the first and second strip conductor patterns 14a and 14b will be described. When the third strip conductor pattern 22 is in contact with the first and second strip conductor patterns 14a and 14b, that is, when the distance d is 0 and the degree of coupling k, which is the ratio of electromagnetic field coupling, is 1, the third strip conductor pattern 22 is electrically connected to the first and second strip conductor patterns 14a and 14b. Therefore, the connection portion 13c of the signal conductor pattern 13 is electrically connected to the third strip conductor pattern 22 by a length L. ３ This is equivalent to connecting a stub conductor pattern.

[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 L of the third strip conductor pattern 22 ３ is the first resonant frequency f ０Ｌ 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 length of ¼ of the propagation wavelength at the first resonance frequency f ０Ｌ At a first resonant frequency f, the signal conductor pattern 13 operates as a quarter-wave open stub with an electrically shorted point formed at the connection portion 13c. 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, of the high frequency signal input from the first input / output terminal 13a, the first resonant frequency f ０Ｌ and the first resonant frequency f ０Ｌ High frequency signals at frequencies in the vicinity of and including 1 / 4 wavelength are attenuated by the 1 / 4 wavelength open 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 the connection portion 13c of the signal conductor pattern 13 is electrically connected to the first and second strip conductor patterns 14a and 14b by a length L. １ This is equivalent to connecting the first strip conductor pattern 14a 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. １ to the second resonant frequency f ０Ｈ The length is set to be 1 / 4 of the propagation wavelength in the

[0038] As a result, the stub transmission line formed by the first strip conductor pattern 14a has a second resonant frequency f ０Ｈ At the second resonant frequency f, the signal conductor pattern 13 operates as a quarter-wave open stub with an electrically shorted point formed at the connection portion 13c. ０Ｈ is the upper limit frequency of the high frequency signal that propagates through the signal conductor pattern 13 and that is blocked.

[0039] Second resonant frequency f ０Ｈ is the first resonant frequency f ０Ｌ The frequency is twice that of ０Ｈ = 2 × f ０Ｌ ) and the length L of the third strip conductor pattern 22 ３ is the length L of the first strip conductor pattern 14a １ It is about twice as long (L ３ ≒ 2 x L １ The length L of the second strip conductor pattern 14b is set to ２ is the length L of the third strip conductor pattern 22 ３ to the length L of the first strip conductor pattern 14a １ and the sum of the distance S between the other end of the first strip conductor pattern 14a and one end of the second strip conductor pattern 14b (L ２ ≒L ３ -L １ -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 in a range 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 of the signal conductor pattern 13 is electrically equivalent to a circuit in which one end of the first coupled line 22a is connected to the connection portion 13c of the signal conductor pattern 13 and the other end of the first coupled line 22a is cascade-connected to one end of the second coupled line 22b, as shown in FIG.

[0042] Therefore, the resonant frequency for a high frequency signal propagating through the stub transmission line formed by the first coupled line 22a and the second coupled line 22b is set to a third resonant frequency f ０ｍ Then, 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 of the third resonance frequency f is shifted to a higher frequency side than the frequency of the first resonance frequency f, 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 degree of coupling 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-wave 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 a third resonant frequency f ０ｍ High frequency signals at frequencies in the vicinity of and including 1 / 4 wavelength are attenuated by the 1 / 4 wavelength open 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 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]

[0047] In the above equation (1), when the coupling factor k=1, which represents the state where the distance d=0, the third resonance frequency f ０ｍ is the first resonant frequency f ０Ｌ matches (f ０ｍ = f ０Ｌ In addition, in the above formula (1), when the coupling degree k=0, which indicates that the distance d is sufficiently large, the third resonance frequency f ０ｍ is the second resonant frequency f ０Ｈ matches (f ０ｍ = f ０Ｈ Furthermore, in the above formula (1), when the coupling degree k, which indicates that the distance d exceeds 0, is 0<k<1, the third resonance frequency f ０ｍ is the first resonant frequency f ０Ｌ to the second resonant frequency f ０Ｈ The frequency will be between

[0048] From the above, in the first embodiment, as shown in FIG. 11, the equivalent length L according to the distance d is ｍ (L １ ≦L ｍ ≦L​３ ) is electrically equivalent to being connected to the connection portion 13c of the signal conductor pattern 13. ｍ The stub transmission line 15 having a selected length L 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 less), the signal conductor pattern 13 functions as a quarter-wave open stub with an electrically shorted point formed at the connection portion 13c.

[0049] 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 14 a, the second strip conductor pattern 14 b, 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 in the range of .gtoreq.d., 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, of the high frequency signal input from the first input / output terminal 13a, the first resonant frequency f ０Ｌ to the second resonant frequency f ０Ｈ High frequency signals at the resonant frequency selected from the range of 1 / 4 wavelength and frequencies in the vicinity of the selected resonant frequency are attenuated by the 1 / 4 wavelength open stub and are prevented from passing to the second input / output terminal 13b.

[0051] Next, a description will be given of setting a frequency at which the passage of high-frequency signals propagating through the signal conductor pattern 13 is blocked in the variable resonator according to embodiment 1. First, the movable mechanism is operated to obtain the electrical origin by bringing the third strip conductor pattern 22 into contact with the first strip conductor pattern 14 a and the second strip conductor pattern 14 b.

[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 movable plate 30 is gradually moved upward by driving the movable mechanism, 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. By gradually increasing the distance d from 0, the degree of coupling k between the first coupled line 22a and the second coupled line 22b is gradually decreased 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 14 a, the second strip conductor pattern 14 b, and the third strip conductor pattern 22, in which an electrical short-circuit point is formed at the connection portion 13 c of the signal conductor pattern 13, decreases to the first resonant frequency f ０Ｌ gradually increases from

[0055] When the resonant frequency of the quarter-wave open stub reaches the set frequency, the driving of the movable mechanism is stopped, the upward movement of the movable 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 quarter-wave open stub and frequencies close to the resonant frequency among the high-frequency signals propagating through the signal conductor pattern 13 is blocked.

[0056] The resonant frequency of the quarter wavelength open stub is the first resonant frequency f ０Ｌ to the maximum, second resonant frequency f ０Ｈ 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 in 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 for adjusting 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 14 a and the second strip conductor pattern 14 b 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 from 1 to 0. ０Ｌ The second resonance frequency f when the coupling factor k is 0 is calculated from 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. A variable resonator according to embodiment 2 will be described with reference to Figures 12 to 16. The variable resonator according to embodiment 2 differs from the variable resonator according to 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 rate of electromagnetic field coupling with the second stub conductor pattern 16, is additionally arranged on the back surface of the second dielectric substrate 21. In addition, in Figures 12 to 16, the same reference numerals as those in Figures 1 to 11 indicate 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 of embodiment 1. The variable resonator of embodiment 2 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 the first coupling adjustment conductor pattern, and a sixth strip conductor pattern 23 which is the second coupling adjustment conductor pattern.

[0060] The first dielectric substrate 11, ground conductor 12, signal conductor pattern 13, and first stub conductor pattern 14 are the same as the first dielectric substrate 11, ground conductor 12, signal conductor pattern 13, and first stub conductor pattern 14 in the variable resonator according to embodiment 1, and therefore their description will be omitted. Also, the second dielectric substrate 21 and third strip conductor pattern 22 are the same as the second dielectric substrate 21 and third strip conductor pattern 22 in the variable resonator according to embodiment 1, and therefore their description will be omitted.

[0061] However, in the second embodiment, the width W of the first strip conductor pattern 14a constituting the first stub conductor pattern 14 is １ and the width W of the second strip conductor pattern 14b １ is 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 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] The width W of the third strip conductor pattern 22 １is narrower than the width W of the third strip conductor pattern 22 in the variable resonator according to the first embodiment. １ Therefore, the coupling lines between the first strip conductor pattern 14a and the third strip conductor pattern 22 and between 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 in the longitudinal direction (Y direction) of the signal conductor pattern 13. 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 has a length L １ The conductive foil is a linear conductive foil, such as a copper foil.

[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 an integrally formed conductor foil, 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 disposed on an extension of the first strip conductor pattern 14a on the surface of the first dielectric substrate 11. The connection point between one end of the fourth strip conductor pattern 16a and the other side surface of the signal conductor pattern 13 is referred to as 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 has a length L ２ The conductive foil is a linear conductive foil, such as a copper foil.

[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 arranged at a distance S from the other end of the fourth strip conductor pattern 16a. The fifth strip conductor pattern 16b is arranged on an extension line of the fourth strip conductor pattern 16a.

[0070] 14, 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. 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 W of the fourth strip conductor pattern 16a １ and the width W of the fifth strip conductor pattern 16b １ is the width W of the first strip conductor pattern 14a １ and the width W of the second strip conductor pattern 14b １ and is narrower than the width W of the signal conductor pattern 13. Therefore, the area occupied by the connection portion 13d, which is the connection portion between one end of the fourth strip conductor pattern 16a and the other side portion of the signal conductor pattern 13, can be made small, 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.

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

[0073] 15, the sixth strip conductor pattern 23 is arranged at a position mirror-symmetrical to the third strip conductor pattern 22 with respect to the central axis in the longitudinal direction of the signal conductor pattern 13. The sixth strip conductor pattern 23 is arranged on an extension line of the third strip conductor pattern 22 at a distance equal to the width W of the signal conductor pattern 13. In other words, 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 distance W therebetween. The sixth strip conductor pattern 23 has a length L ３ The conductive foil is a linear conductive foil, such as a copper foil.

[0074] Length L of the sixth strip conductor pattern 23 ３ is the length L of the fourth strip conductor pattern 16a １ and the length L of the fifth strip conductor pattern 16b. ２ and the spacing S between the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b. １ is the width W of the third strip conductor pattern 22 １ and the width W of the fourth strip conductor pattern 16a １ and the width W of the fifth strip conductor pattern 16b １ is the same as

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

[0076] The width W of the fourth strip conductor pattern 16a, the fifth strip conductor pattern 16b, and the sixth strip conductor pattern 23 １ is narrow, and the coupled 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 16 a, and the fifth strip conductor pattern 16 b 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 14 a, and the second strip conductor pattern 14 b.

[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 f ０Ｌ , the signal conductor pattern 13 functions as a quarter-wave open stub with an electrically shorted point formed at the connection portion 13d.

[0080] When the degree of coupling k between the sixth strip conductor pattern 23 and the fourth and fifth strip conductor patterns 16a and 16b is 0, the stub transmission line formed by the fourth strip conductor pattern 16a has a second resonant frequency f ０Ｈ, the signal conductor pattern 13 functions as a quarter-wave open stub with an electrically shorted point formed at the connection portion 13d.

[0081] When the degree of coupling k between the sixth strip conductor pattern 23 and the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b is in the range greater than 0 and 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 coupled line and the fourth coupled line has a third resonant frequency f ０ｍ , the signal conductor pattern 13 functions as a quarter-wave open stub with an electrically shorted point formed at the connection portion 13d.

[0083] From the above, in the second embodiment, as shown in FIG. 16, the equivalent length L according to the distance d is ｍ (L １ ≦L ｍ ≦L ３ ) is connected to the connection portion 13c of the signal conductor pattern 13, and has an equivalent length L ｍ (L １ ≦L ｍ ≦L ３ ) is electrically equivalent to being connected to the connection portion 13d of the signal conductor pattern 13.

[0084] That is, the resonant frequency of the stub transmission line 15 changes depending on the distance d, and the resonant frequency of the stub transmission line 17 changes depending on the distance d. The resonant frequency of the stub transmission line 15 changes depending on the distance d. The resonant frequency of the stub transmission line 15 changes depending on the distance d. The resonant frequency of the stub transmission line 17 ... selected length L 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 x f ０Ｌ) or less), the signal conductor pattern 13 functions as a quarter-wave open-circuit stub in which an electrical short point is formed at the connection portion 13c and the connection portion 13d.

[0085] In short, the variable resonator according to the second embodiment is a variable resonator in which two variable resonance sections are connected in parallel to the signal conductor pattern 13: a variable resonance section A including the first stub conductor pattern 14 and the third strip conductor pattern 22, which is a coupling adjustment conductor pattern, and a variable resonance section B including the second stub conductor pattern 16 and the sixth strip conductor pattern 23, which is a coupling adjustment conductor pattern. The variable resonance sections A and 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 14 a, the second strip conductor pattern 14 b, and the third strip conductor pattern 22, and the width W1 of each of the fourth strip conductor pattern 16 a, the fifth strip conductor pattern 16 b, and the sixth strip conductor pattern 23 can be narrowed, so that the impedance of the first coupled line to the fourth coupled line can be increased, and the influence on the pass characteristics (frequency characteristics) of the area occupied by the connection portion 13 c and the connection portion 13 d in the signal conductor pattern 13 can be reduced.

[0087] The variable resonator according to the second embodiment has the same effects as the variable resonator according to the first embodiment, and also reduces the influence on the pass characteristics (frequency characteristics) of high-frequency signals propagating through the signal conductor pattern 13. 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 be configured to be continuously formed to fill the gap W, as shown in Fig. 17, instead of being configured to be arranged on a straight line with the gap W therebetween. That is, the third strip conductor pattern 22 and the sixth strip conductor pattern 23 are arranged at positions mirror-symmetrical with respect to the central axis in the longitudinal direction of the signal conductor pattern 13, and have a length L３ The third strip conductor pattern 22 and the length L ３ The sixth strip conductor pattern 23 is continuously formed on the rear surface of the second dielectric substrate 21 in a straight line in the Y direction with a length (2×L ３ +W) is formed as a single strip conductor pattern.

[0089] Another Example 2 of the Second Substrate 20 in the Variable Resonator According to the Second Embodiment As shown in FIG. 18, the lengths of the third strip conductor pattern 22 and the sixth strip conductor pattern 23 on the second substrate 20 are the length L ３ Length L shorter than ΔL ３ ´(=L ３ The length L of the third strip conductor pattern 22 may be ３ ' is the length L of the first strip conductor pattern 14a １ and the length L of the first strip conductor pattern 14a is longer than the sum of the interval S between the first strip conductor pattern 14a and the second strip conductor pattern 14b. １ and the length L of the second strip conductor pattern 14b. ２ is shorter than the sum of the intervals S between the first strip conductor pattern 14a and the second strip conductor pattern 14b.

[0090] That is, the length L of the third strip conductor pattern 22 ３ ' is the length at which, when the distance d is 0, the third strip conductor pattern 22 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 22 forms a first coupled line 22a between itself and the first strip conductor pattern 14a, and forms a first coupled line 22a between itself and the second strip conductor pattern 14b.

[0091] Length L of the sixth strip conductor pattern 23 ３ ' is the length L of the fourth strip conductor pattern 16a １ and the length L of the fourth strip conductor pattern 16a is longer than the sum of the intervals S between the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b. １and the length L of the fifth strip conductor pattern 16b. ２ is shorter than the sum of the intervals S between the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b.

[0092] That is, the length L of the sixth strip conductor pattern 23 ３ ' is the length at which, when the distance d is 0, the sixth strip conductor pattern 23 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 23 forms a first coupled line 22a with the fourth strip conductor pattern 16a and forms a first coupled line 22a with the fifth strip conductor pattern 16b.

[0093] That is, L ３ ' is (L １ +S) < L ３ ´<(L １ +L ２ +S=L ３ ) relationship. 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. ΔL only needs to exceed the maximum allowable range of longitudinal (X-direction) misalignment 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. Setting ΔL in this way does not affect the frequency characteristics of the variable resonator.

[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 are not arranged in a straight line with a gap W therebetween, but are formed continuously to fill the gap W as shown in FIG. 19 , and the lengths of the third strip conductor pattern 22 and the sixth strip conductor pattern 23 are each a length L ３ Length L shorter than ΔL ３ ´(=L ３ −ΔL).

[0095] That is, the signal conductor pattern 13 has a length L ３ ´(=L ３ -ΔL) and the third strip conductor pattern 22 of length L ３ ´(=L ３ A sixth strip conductor pattern 23 having a length (2×L −ΔL) is continuously formed on the rear surface of the second dielectric substrate 21 in a straight line in the Y direction. ３ ´(=L ３ The conductor pattern is formed as a single strip conductor pattern of the length (-ΔL) + W).

[0096] Third Embodiment A high-frequency variable filter circuit according to a third embodiment will be described with reference to Fig. 20 to Fig. 32. The high-frequency variable filter circuit according to the third embodiment is a filter circuit for detecting the fundamental wave (frequency f １ The second harmonic (double wave: frequency f ２ = 2 × f １ a first variable resonator that blocks the passage of a third harmonic (a third harmonic: a frequency f ３ = 3 × f １ The second variable resonator and the third variable resonator are provided to block the passage of the second variable resonator and the third variable resonator.

[0097] The high-frequency variable filter circuit according to the third embodiment is a high-frequency variable filter circuit used particularly in communication devices 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 formed by combining a series inductor and a capacitor.

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

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

[0100] 20 to 27, 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. The first substrate 10 is a microstrip substrate that has a microstrip line that transmits high-frequency signals composed of electromagnetic waves and that constitutes a high-frequency filter circuit. The first substrate 10 includes 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, 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 the resonant frequency for blocking second harmonics, while 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 the resonant frequency for blocking third harmonics, respectively.

[0102] The ground conductor 12 is a conductive foil, such as copper foil, formed on the entire back surface of the flat first dielectric substrate 11 in Fig. 20. The signal conductor pattern 13A is a microstrip line formed on the front surface of the first dielectric substrate 11, and forms 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, for example, copper foils, connected in sequence from the first input / output terminal 13a to the second input / output terminal 13b. The widths W of the first connecting line portion 13A3 and the second connecting line portion 13A4 are ２ 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 lengths of the first connection line portion 13A3 and the second connection line portion 13A4 are the same, and as shown in FIG. ｔ The first connection line portion 13A3 and the second connection line portion 13A4 each function 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 quarter-wave 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 has a length L １ The conductive foil is a linear conductive foil, such as a copper foil.

[0106] One end of the first strip conductor pattern 14a is electrically connected to one side surface 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 an integrally formed conductor foil, and one end of the first strip conductor pattern 14a and one side surface of the junction between the first and second connecting line portions 13A3 and 13A4 are not physically separated, and the boundary surface of the junction between the first strip conductor pattern 14a and the first and second connecting line portions 13A3 and 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 and second connecting line portions 13A3 and 13A4. The connection portion between one end of the first strip conductor pattern 14a and one side of the junction between the first and second connecting line portions 13A3 and 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 has a length L ２ The conductive foil is a linear conductive foil, such as a copper foil.

[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 arranged with a gap S between it and the other end of the first strip conductor pattern 14a. The second strip conductor pattern 14b is arranged 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 with a gap S between them on the surface of the first dielectric substrate 11, as shown in FIG.

[0110] The width W of the first strip conductor pattern 14a is the same as the width W of the second strip conductor pattern 14b. 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, the third stub conductor pattern 14B 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 quarter-wave 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 has a length L ４ The seventh strip conductor pattern 14c is a linear conductor foil, for example, a copper foil, having a length L ４ is the length L of the first strip conductor pattern 14a １ It is 2 / 3 of that.

[0113] One end of the seventh strip conductor pattern 14c is electrically connected to one side surface at one end of the first connecting 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 an integrally formed conductor foil, 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 at the first connecting line portion 13A3 is referred to as one side surface.

[0114] The seventh strip conductor pattern 14c is arranged orthogonal to the first connecting line portion 13A3 on the surface of the first dielectric substrate 11. The connection portion between one end of the seventh strip conductor pattern 14c and one side of the first connecting 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 has a length L ５ The eighth strip conductor pattern 14d is a linear conductor foil, for example, a copper foil, having a length L ５ is the length L of the second strip conductor pattern 14b ２ It is 2 / 3 of that.

[0116] Both ends of the eighth strip conductor pattern 14d are open ends, and the open end located at one end of the eighth strip conductor pattern 14d is arranged with a gap S between it and the other end of the seventh strip conductor pattern 14c. The eighth strip conductor pattern 14d is arranged on an extension line 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 with a gap S between them on the surface of the first dielectric substrate 11, as shown in FIG.

[0117] The seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d have the same width W. 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, the fourth stub conductor pattern 14C 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 quarter-wave 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 has a length L ４ The tenth strip conductor pattern 14e is a linear conductor foil, for example, a copper foil, having a length L ４ is the length L of the first strip conductor pattern 14a １ This is 2 / 3 of the total.

[0120] One end of the tenth strip conductor pattern 14e is electrically connected to one side surface at the other end of the second connecting 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 an integrally formed conductor foil, 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, and the boundary surface between the tenth strip conductor pattern 14e and the other side of the second connecting line portion 13A4 is referred to as one side surface.

[0121] The tenth strip conductor pattern 14e is arranged perpendicular to the second connecting line portion 13A4 on the surface of the first dielectric substrate 11. The connection portion between one end of the tenth strip conductor pattern 14e and the other side of the second connecting 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 has a length L ５ The eleventh strip conductor pattern 14f is a linear conductor foil, for example, a copper foil, having a length L ５ is the length L of the second strip conductor pattern 14b ２ This is 2 / 3 of the total.

[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 arranged with a gap S between it and the other end of the tenth strip conductor pattern 14e. The eleventh strip conductor pattern 14f is arranged 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 with a gap S between them on the surface of the first dielectric substrate 11, as shown in FIG.

[0124] The width W of the tenth strip conductor pattern 14e is the same as the width W of the eleventh strip conductor pattern 14f. The width W of the tenth strip conductor pattern 14e is 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 adjustment conductor pattern, a third coupling adjustment conductor pattern, and a fourth coupling adjustment conductor pattern for adjusting the degree of coupling k, which is the ratio of electromagnetic field coupling between 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 of the second substrate 20 and the front surface of the flat first dielectric substrate 11 of the first substrate 10 are disposed opposite to each other, and the second substrate 20 is movable (moved up and down) with respect to the surface of the first substrate 10 via the movable plate 30, which can move the second substrate 20 in the front-to-back direction by a movable mechanism (not shown). Note that, although the second substrate 20 is movable up and down relative to the first substrate 10 in the third embodiment, the first substrate 10 may also be movable up and down with respect to 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 coupling factor 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 arranged on the rear surface of the second dielectric substrate 21, facing 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 has a length L ３ The conductive foil is a linear conductive foil, such as a copper foil.

[0130] Length L of the third strip conductor pattern 22A３ is the length L of the first strip conductor pattern 14a as shown in FIGS. 22 and 24. １ and the length L of the second strip conductor pattern 14b. ２ and the spacing S between the first strip conductor pattern 14a and the second strip conductor pattern 14b. 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, as shown in FIG.

[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 close coupling to loose coupling.

[0132] The third strip conductor pattern 22A 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.

[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-end stubs for the upper frequency limit f ２Ｈ is the lower limit frequency f ２Ｌ and the length L of the third strip conductor pattern 22A is set to twice the length L ３ is the length L of the first strip conductor pattern 14a. １ It shall be twice the amount.

[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 coupling factor 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 arranged on the rear surface of the second dielectric substrate 21, facing 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 has a length L ６ The conductive foil is a linear conductive foil, such as a copper foil.

[0137] The length L of the ninth strip conductor pattern 22B ６ As shown in FIGS. 22 and 24, the length L of the seventh strip conductor pattern 14c ４ and the length L of the eighth strip conductor pattern 14d. ５ and the spacing S between the seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d.

[0138] The length L of the ninth strip conductor pattern 22B ６ is the length L of the third strip conductor pattern 22A ３ 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 and 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-end stubs for the upper limit frequency f ３Ｈ is the lower limit frequency f ３Ｌ and the length L of the ninth strip conductor pattern 22B is twice as long as the length L ６ is the length L of the seventh strip conductor pattern 14c. ４ It shall be twice the amount.

[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 coupling factor 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 arranged on the rear surface of the second dielectric substrate 21, facing the tenth strip conductor pattern 14e and the eleventh strip conductor pattern 14f.

[0144] That is, the twelfth strip conductor pattern 22C is located immediately above the tenth strip conductor pattern 14e and the eleventh strip conductor pattern 14f. The twelfth strip conductor pattern 22C has a length L ６ The conductive foil is a linear conductive foil, such as a copper foil.

[0145] The length L of the twelfth strip conductor pattern 22C ６ is the length L of the tenth strip conductor pattern 14e as shown in FIGS. 22 and 24. ４ and the length L of the eleventh strip conductor pattern 14f. ５ and the spacing S between the tenth strip conductor pattern 14e and the eleventh strip conductor pattern 14f.

[0146] The length L of the twelfth strip conductor pattern 22C ６ is the length L of the third strip conductor pattern 22A ３ The width W of the twelfth strip conductor pattern 22C is equal to the width W of the tenth strip conductor pattern 14e and the width W of the eleventh strip conductor pattern 14f, as shown in FIG.

[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 there is a distance d (see FIGS. 25 and 27) between the tenth strip conductor pattern 14e and the eleventh strip conductor pattern 14f where the electromagnetic field coupling ranges from tight coupling to 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 where it is sufficiently separated from the 10th strip conductor pattern 14e and the 11th strip conductor pattern 14f (coupling degree k=0) as the second substrate 20 is moved 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 ３Ｈ The tenth strip conductor pattern 14e, the eleventh strip conductor pattern 14f, and the twelfth strip conductor pattern 22C can function as adjustable quarter-wave open-circuit stubs for the upper limit frequency f ３Ｈ is the lower limit frequency f ３Ｌ and the length L of the 12th strip conductor pattern 22C is set to twice the length L ６ is the length L of the tenth strip conductor pattern 14e. ４ It shall be twice the amount.

[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 L of the first strip conductor pattern 14a １ and the length L of the second strip conductor pattern 14b ２ and the length L of the third strip conductor pattern 22A. ３When 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 k, which is the ratio of electromagnetic field coupling, is 1, the third strip conductor pattern 22A is electrically connected to the first strip conductor pattern 14a and the second strip conductor pattern 14b, and therefore, a distance L ３ This is equivalent to connecting a stub conductor pattern.

[0152] Length L of the third strip conductor pattern 22A ３ is the fundamental wave f １ The lower limit frequency f １Ｌ twice the frequency f ２Ｌ (=2 x f １Ｌ ), that is, the frequency of the double wave f ２ The lower limit frequency f ２Ｌ The fundamental wave f １ The lower limit frequency f 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 ２ＬA 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 capacitance value C associated with 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 and second strip conductor patterns 14a and 14b are not affected by the third strip conductor pattern 22A, and therefore the connection portion 13c of the signal conductor pattern 13 is electrically connected to the first and second strip conductor patterns 14a and 14b by a length L. １ This is equivalent to connecting the first strip conductor pattern 14a as a stub conductor pattern.

[0158] Length L of the first strip conductor pattern 14a １ is the fundamental wave f １ The upper limit frequency f １Ｈ twice the frequency f ２Ｈ (=2 × f １Ｈ), that is, the frequency f of the double wave of the fundamental wave ２ The upper limit frequency for f ２Ｈ The fundamental wave f １ The upper limit frequency f １Ｈ twice the frequency f ２Ｈ As a result, the stub transmission line formed by the first strip conductor pattern 14a has a length equal to the 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 of the double wave of the fundamental wave in the high frequency signal input from the first input / output terminal 13a is ２Ｈ and the upper limit frequency f for the double wave ２Ｈ High-frequency signals at frequencies in the vicinity of and including 1 / 4 wavelength 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 limit frequency f for the double wave ２Ｈ High-frequency signals at frequencies in the vicinity of and including 1 / 4 wavelength 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 14 a and the second strip conductor pattern 14 b and the ground conductor 12 is set to an upper limit frequency f ２Ｈ The lower limit capacitance value C associated with 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 The frequency is twice that of２Ｈ = 2 × f ２Ｌ ) and the length L of the third strip conductor pattern 22A ３ is the length L of the first strip conductor pattern 14a １ It is about twice as long (L ３ ≒ 2 x L １ The length L of the second strip conductor pattern 14b is set to ２ is the length L of the third strip conductor pattern 22A ３ to the length L of the first strip conductor pattern 14a １ and the sum of the distance S between the other end of the first strip conductor pattern 14a and one end of the second strip conductor pattern 14b (L ２ ≒L ３ -L １ -S).

[0163] When the distance d between the third strip conductor pattern 22A and the first and second strip conductor patterns 14a and 14b is in a range 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 coupled line 22Aa is connected to the connection portion 13c in the signal conductor pattern 13A and the other end of the first coupled line 22Aa is cascade-connected to one end of the second coupled line 22Ab, as shown in FIG.

[0165] Therefore, the frequency f of the second harmonic of the fundamental wave propagating through the stub transmission line formed by the first coupled line 22Aa and the second coupled line 22Ab is ２ For high frequency signals, the intermediate frequency f ２ｍis the third resonance frequency, the coupling factor k decreases from 1 as the distance in the Z direction increases from the contact state between the third strip conductor pattern 22A and the first and second strip conductor patterns 14a and 14b, that is, as the distance d increases. ２ｍ is the lower limit frequency f ２Ｌ The frequency is shifted to a higher frequency side than the normal frequency, and an electrical short-circuit point is always formed at the connection portion 13c of the signal conductor pattern 13A.

[0166] When the distance d is further increased and the coupling factor k approaches 0, the intermediate frequency f ２ｍ is the upper limit frequency f ２Ｈ As a result, the stub transmission line formed by the first coupled line 22a and the second coupled line 22b is shifted to asymptotically approach the intermediate frequency f ２ｍ , the signal conductor pattern 13A functions as a quarter-wave open stub with an electrically shorted point formed at the connection portion 13c.

[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 in the range of .gtoreq.d., 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 the 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 the intermediate frequency f ２ｍ In the third embodiment, a high-frequency signal having a frequency in the vicinity of the lower limit frequency f 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. ２Ｌ and the upper frequency f ２Ｈ and the 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 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 (L １ ≦L ２ｍ ≦L ３ ), and the frequency f ２ For the lower limit frequency f 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 / 3 GHz, to the connecting portion 13c of the signal conductor pattern 13A.

[0172] Length L２ｍ 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 x f ２Ｌ ) or less), it operates as a quarter-wave open stub in which an electrical short 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 C ２Ｌ Capacitance value (C ２Ｌ Above C ２Ｈ (capacitance value below).

[0174] The length L of the seventh strip conductor pattern 14c ４ and the length L of the eighth strip conductor pattern 14d ５ and the length L of the ninth strip conductor pattern 22B ６ , and the length L of the tenth strip conductor pattern 14e ４ and the length L of the eleventh strip conductor pattern 14f ５ and the length L of the twelfth strip conductor pattern 22C. ６ The length L ４ is the length L １ 2 / 3 of length L ６ is the length L ３ 2 / 3 of length L ５ is the length L ２ It is set to 2 / 3 of the original value.

[0175] Therefore, the stub transmission line formed of the seventh strip conductor pattern 14c, the eighth strip conductor pattern 14d, and the ninth strip conductor pattern 22B connected to the connection portion 13e of the signal conductor pattern 13A has a frequency f ３ , the signal conductor pattern 13A functions as a quarter-wave open stub with an electrically shorted point formed at the connection portion 13e.

[0176] Furthermore, the stub transmission line formed of the tenth strip conductor pattern 14e, the eleventh strip conductor pattern 14f, and the twelfth strip conductor pattern 22C connected to the connection portion 13f of the signal conductor pattern 13A has a frequency f ３ , the signal conductor pattern 13A functions as a quarter-wave open stub with an electrically shorted point formed at the connection portion 13f.

[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 L ３ｍ (L ４ ≦L ３ｍ ≦L ６ ), and the frequency f ３ For the lower limit frequency f 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 connecting 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. As shown in FIG. 29, the equivalent length L ３ｍ (L ４ ≦L ３ｍ ≦L ６ ), and the frequency f ３ For the lower limit frequency f 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 connecting portion 13e of the signal conductor pattern 13A.

[0179] Length L ３ｍ and a stub transmission line 15B having a length L ３ｍ Each of the stub transmission lines 15C has 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 ) or lower), 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, as shown in FIG.

[0180] Therefore, 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 seventh strip conductor pattern 14 c, the eighth strip conductor pattern 14 d, and the ninth strip conductor pattern 22 B, and is prevented from passing to the second input / output terminal 13 b.

[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-wave open-end stub based on the stub transmission line formed by the tenth strip conductor pattern 14 e, the eleventh strip conductor pattern 14 f, and the twelfth strip conductor pattern 22 C, and is prevented from passing to the first input / output terminal 13 a.

[0182] On the other hand, the length L ３ｍ and a 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 Above C ３Ｈ The second substrate 20 is moved up and down to a selected distance d, and the length L ３ｍ and a stub transmission line 15B having a length L ３ｍ The capacitance of each stub transmission line 15 having a length L ２ｍ This is smaller than the capacitance value of the stub transmission line 15A having the above-mentioned capacitance.

[0183] In short, in the third embodiment, the third strip conductor pattern 22A is moved up and down, so that the frequency f of the high frequency signal propagating through the signal conductor pattern 13A is ２ The resonance frequency for the double wave is the lower limit frequency f ２Ｌ to the upper frequency f ２Ｈ The ninth strip conductor pattern 22B and the twelfth strip conductor pattern 22C are respectively moved up and down to adjust the frequency between the frequency f ３ The resonance frequency for the triple wave is the lower limit frequency f ３Ｌ to the upper frequency f ３ＨAs 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, thereby increasing the capacitance value of the second capacitor between the third stub conductor pattern 14B and the ground conductor 12 to an upper limit capacitance value C ３Ｈ to the lower limit capacitance value C ３Ｌ The capacitance value of the third capacitor between the fourth stub conductor pattern 14C and the ground conductor 12 is adjusted to an upper limit capacitance value C by moving the twelfth strip conductor pattern 22C 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. 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 frequency f of the high frequency signal propagating through the signal conductor pattern 13A is increased. １ The capacitance values ​​of the first to third capacitors for the fundamental wave can be adjusted.

[0187] As shown in FIG. 32, for the fundamental wave of the high-frequency signal propagating through the signal conductor pattern 13A, a variable capacitance C ２ The variable capacitance C is formed by the first capacitor 18A and the third stub conductor pattern 14B connected to the connection portion 13e. ３ The variable capacitance C is formed by the second capacitor 18B and the fourth stub conductor pattern 14C connected to the connection portion 13f. ３ The third capacitor 18C constitutes a low-pass filter using an LC circuit.

[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 relative 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 the frequency can be mechanically adjusted to a range between f and t, 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, the signal conductor pattern 13A having the first input / output line portion 13A1, the first connecting line portion 13A3, the second connecting line portion 13A4, and the second input / output line portion 13A2, which are connected in sequence; the first strip conductor pattern 14a electrically connected to the connecting portion 13c between the other end of the first connecting line portion 13A3 and one end of the second connecting line portion 13A4; and the first strip conductor pattern 14a, which is disposed with a gap between the other end of the first strip conductor pattern 14a and the connecting portion 13c. a second strip conductor pattern 14b having one end electrically connected to a connecting portion 13e which is one end of the first connecting line portion 13A3; a seventh strip conductor pattern 14c having one end electrically connected to a connecting portion 13e which is one end of the first connecting 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 having one end electrically connected to a connecting portion 13f which is the other end of the second connecting line portion 14A4; a second substrate (20) having, on the back surface of a second dielectric substrate (21), a third strip conductor pattern (22A) arranged opposite the first strip 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 movable plate connected to the front surface of the second substrate (20) and movable in the front-rear direction of the second substrate (20) for adjusting the distance between the front surface of the first substrate (10) and the rear surface of the second substrate (20). ２ and a variable capacitance C based on a second capacitor 18B configured by a third stub conductor pattern 14B based on the seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d connected to the connecting portion 13e. ３and the variable capacitance C of the third capacitor 18C 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. ３ By moving the second substrate 20 up and down with respect to the surface of the first substrate 10, the upper limit capacitance value C ２Ｈ , C ３Ｈ to the lower limit capacitance value C ２Ｌ , C ３Ｌ As a result, the frequency f of the fundamental wave propagating through the signal conductor pattern 13A can be adjusted １ The lower limit frequency f １Ｌ to the upper frequency f １Ｈ Since the frequency can be mechanically adjusted to a range between f and t, 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 a fundamental frequency f １ The upper limit frequency f １Ｈ The lower limit frequency f １Ｌ Since the frequency is doubled compared to the fundamental frequency f １ can be set mechanically.

[0191] Furthermore, in the high-frequency variable filter circuit according to the third embodiment, the coupling degree 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 coupling degree 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 coupling degree 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. ２Ｌ, f ３Ｌ From the above, the resonance 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] 33 to 35. The high-frequency variable filter circuit according to the fourth embodiment is different from the high-frequency variable filter circuit according to the third embodiment in that a second stub conductor pattern 16A, which is a mirror image of the first stub conductor pattern 14A, a fifth stub conductor pattern 16B, which is a mirror image of the third stub conductor pattern 14B, and a sixth stub conductor pattern 16C, which is a mirror image of 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, and The difference is that a sixth strip conductor pattern 23A, which is a second coupling degree 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 degree 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 degree 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 Figures 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 of embodiment 3, and therefore description thereof 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 of embodiment 3, and therefore their description will be omitted.

[0198] However, in the fourth embodiment, the width W of the first strip conductor pattern 14a constituting the first stub conductor pattern 14A is １ and the width W of the second strip conductor pattern 14b １ and the width W of the seventh strip conductor pattern 14c constituting the third stub conductor pattern 14B. １ and the width W of the eighth strip conductor pattern 14d １ and the width W of the tenth strip conductor pattern 14e constituting the fourth stub conductor pattern 14C. １ and the width W of the eleventh strip conductor pattern 14f １ is narrower than the width W of the signal conductor pattern 13A, 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 14A, the width W of the seventh strip conductor pattern 14c and the width W of the eighth strip conductor pattern 14d constituting 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 constituting the fourth stub conductor pattern 14C in the high-frequency variable filter circuit of embodiment 3.

[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 of 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] The width W of the third strip conductor pattern 22A １ and the width W of the ninth strip conductor pattern 22B １ and the width W of the twelfth strip conductor pattern 22C １ is 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 the third embodiment.

[0201] The width W of the first strip conductor pattern 14a, the second strip conductor pattern 14b, and the third strip conductor pattern 22A １ Therefore, the coupling lines between the first strip conductor pattern 14a and the third strip conductor pattern 22 and between the second strip conductor pattern 14b and the third strip conductor pattern 22 have high characteristic impedance.

[0202] The width W of the seventh strip conductor pattern 14c, the eighth strip conductor pattern 14d, and the ninth strip conductor pattern 22B １ Therefore, the coupling lines between the seventh strip conductor pattern 14c and the eighth strip conductor pattern 14d and the ninth strip conductor pattern 22B have high characteristic impedance.

[0203] The width W of the tenth strip conductor pattern 14e, the eleventh strip conductor pattern 14f, and the twelfth strip conductor pattern 22C１ The coupling lines between the tenth strip conductor pattern 14e and the twelfth strip conductor pattern 22C and between 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 quarter-wave open-circuit 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 has a length L １ , width W １ The conductive foil is a linear conductive foil, such as a copper foil.

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

[0207] The fourth strip conductor pattern 16a is orthogonal to the signal conductor pattern 13A and is disposed 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 of the signal conductor pattern 13A is called a connection portion 13d. The width W of the fourth strip conductor pattern 16a is １is narrow compared to the width W, the area occupied by the connection portion 13d can be made small, 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 has a length L ２ , width W １ The conductive foil is a linear conductive foil, such as a copper foil.

[0209] Both ends of the fifth strip conductor pattern 16b are open, and the open end located at one end of the fifth strip conductor pattern 16b is arranged with a gap S between it and the other end of the fourth strip conductor pattern 16a. The fifth strip conductor pattern 16b is arranged 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 between them 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 longitudinal direction (Y direction) of the signal conductor pattern 13A. 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 quarter-wave open-end stub for the triplet wave 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 has a length L ４ (=L１ ×2 / 3), width W １ The conductive foil is a linear conductive foil, such as a copper foil.

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

[0213] The thirteenth strip conductor pattern 16c is orthogonal to the signal conductor pattern 13A and is disposed on the extension of the seventh strip conductor pattern 14c on the surface of the first dielectric substrate 11. 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. The width W of the thirteenth strip conductor pattern 16c is １ is narrow compared to the width W, the area occupied by the connection portion 13g can be made small, 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 has a length L ５ (=L ２ ×2 / 3), width W １ The conductive foil is a linear conductive foil, such as a copper foil.

[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 arranged with a gap S between it and the other end of the thirteenth strip conductor pattern 16c. The fourteenth strip conductor pattern 16d is arranged 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 with a gap S between them on the surface of the first dielectric substrate 11, 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 in the longitudinal direction (Y direction) of the signal conductor pattern 13A. 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 quarter-wave open-end stub for the triplet wave 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 has a length L ４ (=L １ ×2 / 3), width W １ The conductive foil is a linear conductive foil, such as a copper foil.

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

[0219] The sixteenth strip conductor pattern 16e is orthogonal to the signal conductor pattern 13A and is disposed on the extension of the seventh strip conductor pattern 14c on the surface of the first dielectric substrate 11. 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. The width W of the sixteenth strip conductor pattern 16e is １ is narrow compared to the width W, the area occupied by the connection portion 13h can be made small, 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 has a length L ５ (=L ２ ×2 / 3), width W １ The conductive foil is a linear conductive foil, such as a copper foil.

[0221] Both ends of the 17th strip conductor pattern 16f are open ends, and the open end located at one end of the 17th strip conductor pattern 16f is arranged with a gap S between it and the other end of the 16th strip conductor pattern 16e. The 17th strip conductor pattern 16f is arranged on an extension of the 16th strip conductor pattern 16e. That is, the 16th strip conductor pattern 16e and the 17th strip conductor pattern 16f are arranged on a straight line in the X direction with a gap S between them on the surface of the first dielectric substrate 11, as shown in FIG.

[0222] The sixth strip conductor pattern 23A on the second substrate 20 is disposed opposite the fourth strip conductor pattern 16a and the fifth strip conductor pattern 16b on the rear surface of the second dielectric substrate 21. 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] 35, the sixth strip conductor pattern 23A is arranged at a position mirror-symmetrical to the third strip conductor pattern 22A with respect to the central axis of the longitudinal direction of the signal conductor pattern 13A. The sixth strip conductor pattern 23A is arranged on an extension line of the third strip conductor pattern 22A with a width W of the first connecting line portion 13A3 and the second connecting line portion 13A4 of the signal conductor pattern 13A. ２ are spaced apart by the same distance.

[0224] That is, the third strip conductor pattern 22A and the sixth strip conductor pattern 23A are spaced apart by a distance W ２ The sixth strip conductor pattern 23A is arranged in a straight line in the X direction with a space therebetween. ３ (=L １ +L ２ + S ≒ 2 × L １ ), width W １ The conductive foil is a linear conductive foil, such as a copper foil.

[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 coupled 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 close coupling to loose coupling.

[0226] The width W of the fourth strip conductor pattern 16a, the fifth strip conductor pattern 16b, and the sixth strip conductor pattern 23A １ 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] Like the third strip conductor pattern 22A, the sixth strip conductor pattern 23A 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 lower than the 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-wave open-end stubs for the .lambda.

[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 opposite the thirteenth strip conductor pattern 16c and the fourteenth strip conductor pattern 16d on the rear surface of the second dielectric substrate 21. 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] 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 longitudinal center axis of the signal conductor pattern 13A. The fifteenth strip conductor pattern 23B is arranged on an extension line of the ninth strip conductor pattern 22B, the width W of the first connecting line portion 13A3 of the signal conductor pattern 13A. ２ are spaced apart by the same distance.

[0232] That is, the ninth strip conductor pattern 22B and the fifteenth strip conductor pattern 23B are spaced apart by a distance W ２The fifteenth strip conductor pattern 23B is arranged in a straight line in the X direction with a space therebetween. ６ (=L ４ +L ５ + S ≒ 2 × L ５ ), width W １ The conductive foil is a linear conductive foil, such as a copper foil.

[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 coupled line between the 13th strip conductor pattern 16c and the 14th strip conductor pattern 16d when the electromagnetic field coupling between the 13th strip conductor pattern 16c and the 14th strip conductor pattern 16d is at a distance d from the close coupling to the loose coupling.

[0234] The width W of the thirteenth strip conductor pattern 16c, the fourteenth strip conductor pattern 16d, and the fifteenth strip conductor pattern 23B １ The coupling lines between the thirteenth strip conductor pattern 16c, the fourteenth strip conductor pattern 16d and the fifteenth 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 from them (coupling degree k=0) as the second substrate 20 is moved 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-wave open-end 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 opposite the sixteenth strip conductor pattern 16e and the seventeenth strip conductor pattern 16f on the rear surface of the second dielectric substrate 21. 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] 35, the 18th strip conductor pattern 23C is arranged at a position that is mirror-symmetrical to the 12th strip conductor pattern 22C with respect to the longitudinal center axis of the signal conductor pattern 13A. The 18th strip conductor pattern 23C is arranged on an extension line of the 12th strip conductor pattern 22C with the width W of the second connecting line portion 13A4 of the signal conductor pattern 13A. ２ are spaced apart by the same distance.

[0240] That is, the twelfth strip conductor pattern 22C and the eighteenth strip conductor pattern 23C are spaced apart by a distance W ２ The eighteenth strip conductor pattern 23C is arranged in a straight line in the X direction with a gap of L ６ (=L ４ +L ５ + S ≒ 2 × L ５ ), width W １ The conductive foil is a linear conductive foil, such as a copper foil.

[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 there is a distance d between the 16th strip conductor pattern 16e and the 17th strip conductor pattern 16f and the electromagnetic field coupling ranges from tight coupling to loose coupling.

[0242] The width W of the sixteenth strip conductor pattern 16e, the seventeenth strip conductor pattern 16f, and the eighteenth strip conductor pattern 23C １ The coupling lines between the sixteenth strip conductor pattern 16e, the seventeenth strip conductor pattern 16f and the eighteenth strip conductor pattern 23C have high characteristic impedance.

[0243] Like the 12th strip conductor pattern 22C, the 18th strip conductor pattern 23C 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) as the second substrate 20 is moved 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-wave open-end stubs for the .lambda.

[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 ２ＨBy 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, for the fundamental wave of the high-frequency signal propagating through the signal conductor pattern 13A, a variable capacitance C ２ and a variable capacitance C formed by a second stub conductor pattern 16A connected to the connection portion 13d and electrically connected in parallel to the first capacitor. ２ and a variable capacitance C formed by the third stub conductor pattern 14B connected to the connection portion 13e. ３ and a variable capacitance C formed by the second capacitor and the fifth stub conductor pattern 16B connected to the connection portion 13g and electrically connected in parallel to the second capacitor. ３ and a variable capacitance C formed by the fourth stub conductor pattern 14C connected to the connection portion 13f. ３ and a variable capacitance C formed by a sixth stub conductor pattern 1cC connected to the connection portion 13g and electrically connected in parallel to the third capacitor. ３ A low-pass filter is formed by an LC circuit formed by the sixth 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 relative 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 the frequency can be mechanically adjusted to a range between f and t, 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 １Ｌto 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 13 a and the second input / output terminal 13 b 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 13 a to the second input / output terminal 13 b 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 embodiment 4 has the same effects as the high-frequency variable filter circuit according to embodiment 3, and also reduces the influence on the pass characteristics (frequency characteristics) of high-frequency signals propagating through the signal conductor pattern 13 A. As a result, the high-frequency variable filter circuit according to embodiment 4 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 are spaced apart from each other by an interval W ２ 36. ２ It may be configured so that the gap is filled and continuously formed.

[0253] That is, the signal conductor pattern 13A is arranged at a position mirror-symmetrical with respect to the central axis in the longitudinal direction thereof, and has a length L ３ The third strip conductor pattern 22A and the length L ３The sixth strip conductor pattern 23A is continuously arranged on the rear surface of the second dielectric substrate 21 in a straight line in the X direction with a length (2×L ３ +W ２ ) is formed as a single strip conductor pattern.

[0254] In addition, a signal conductor pattern 13A having a length L ６ The ninth strip conductor pattern 22B and the length L ６ The fifteenth strip conductor pattern 23B is continuously formed on the rear surface of the second dielectric substrate 21 in a straight line in the X direction with a length (2×L ６ +W ２ ) is formed as a single strip conductor pattern. Furthermore, a signal conductor pattern 13A is formed as a single strip conductor pattern of length L ６ The twelfth strip conductor pattern 22C and the length L ６ The eighteenth strip conductor pattern 23C is continuously formed on the rear surface of the second dielectric substrate 21 in a straight line in the X direction with a length (2×L ６ +W ２ ) is formed as a single strip conductor pattern.

[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 lengths of the third strip conductor pattern 22A and the sixth strip conductor pattern 23A on the second substrate 20 are the length L ３ Length L shorter than ΔL ３ ´(=L ３ −ΔL).

[0256] Furthermore, the lengths of the ninth strip conductor pattern 22B and the fifteenth strip conductor pattern 23B, and the lengths of the twelfth strip conductor pattern 22C and the eighteenth strip conductor pattern 23C are, as shown in FIG. 37, the length L ６ Length L shorter than ΔL ６ ´(=L ６ −ΔL).

[0257] Length L ３ ´ is length L １and the interval S, and the length L １ and length L ２ and the interval S. That is, the length L of the third strip conductor pattern 22A is ３ ' is the length at which, 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 a second coupled line with the second strip conductor pattern 14b.

[0258] Length L of the sixth strip conductor pattern 23A ３ ' is the length at which, 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 23 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] Also, the length L ６ ´ is length L ４ and the interval S, and the length L ４ and length L ５ and the interval S. That is, the length L of the ninth strip conductor pattern 22B is ６ ' is the length at which, 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 L of the 15th strip conductor pattern 23B ６' is the length at which, 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 between itself and the 13th strip conductor pattern 16c, and a tenth coupled line between itself and the 14th strip conductor pattern 16d.

[0261] The length L of the twelfth strip conductor pattern 22C ６ ' is the length at which, 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 seventh coupled line with the 10th strip conductor pattern 14e and an eighth coupled line with the 11th strip conductor pattern 14f.

[0262] The length L of the 18th strip conductor pattern 23C ６ ' is the length at which, 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 coupled line between itself and the 16th strip conductor pattern 16e, and a 12th coupled line between itself and the 17th strip conductor pattern 16f.

[0263] L ３ ' is (L １ +S) < L ３ ´<(L １ +L ２ +S=L ３ ) relationship, and L ６ ' is (L ４ +S) < L ６ ´<(L ４ +L ５ +S=L ６ ) In addition, ΔL is in a range that is sufficiently shorter than the propagation wavelength of the fundamental wave in the high frequency signal, for example, λ / 10 or less.

[0264] Furthermore, ΔL only needs to exceed the maximum allowable ranges 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, 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 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. Setting ΔL in this manner does not affect the frequency characteristics of the variable resonator.

[0265] Another example 3 of the second substrate 20 in the high-frequency variable filter circuit according to the fourth embodiment As shown in FIG. 38, the third strip conductor pattern 22A and the sixth strip conductor pattern 23A on the second substrate 20 are spaced apart by a distance W ２ Instead of being arranged in a straight line with a gap of W ２ The third strip conductor pattern 22A and the sixth strip conductor pattern 23A are formed continuously, filling the space between the first and second strip conductor patterns 22A and 23A. ３ Length L shorter than ΔL ３ ´(=L ３ −ΔL).

[0266] The ninth strip conductor pattern 22B and the fifteenth strip conductor pattern 23B on the second substrate 20 are spaced apart by a distance W ２ Instead of being arranged in a straight line with a gap of W ２ The ninth strip conductor pattern 22B and the fifteenth strip conductor pattern 23B are formed continuously, filling the gap, and the length of each of the ninth strip conductor pattern 22B and the fifteenth strip conductor pattern 23B is equal to or longer than the length L ６ Length L shorter than ΔL ６ ´(=L ６ −ΔL).

[0267] Furthermore, the twelfth strip conductor pattern 22C and the eighteenth strip conductor pattern 23C are spaced apart by a distance W ２ Instead of being arranged in a straight line with a gap of W ２ The twelfth strip conductor pattern 22C and the eighteenth strip conductor pattern 23C are formed continuously, filling the gap, and the length of each of the twelfth strip conductor pattern 22C and the eighteenth strip conductor pattern 23C is equal to or longer than the length L ６ Length L shorter than ΔL ６ ´(=L ６ −ΔL).

[0268] That is, the signal conductor pattern 13A is arranged at a position mirror-symmetrical with respect to the central axis in the longitudinal direction thereof, and has a length L ３ ´(=L ３ -ΔL) and the third strip conductor pattern 22A of length L ３ ´(=L ３ A sixth strip conductor pattern 23A having a length (2×L −ΔL) is continuously formed on the rear surface of the second dielectric substrate 21 in a straight line in the X direction. ３ ´(=L ３ -ΔL) + W ２ ) is formed as a single strip conductor pattern.

[0269] The signal conductor pattern 13A has a length L ６ ´(=L ６ -ΔL) and the ninth strip conductor pattern 22B of length L ６ ´(=L ６ A fifteenth strip conductor pattern 23B having a length (2×L −ΔL) is continuously formed on the rear surface of the second dielectric substrate 21 in a straight line in the X direction. ６ ´(=L ６ -ΔL) + W ２ ) is formed as a single strip conductor pattern.

[0270] The signal conductor pattern 13A has a length L ６ ´(=L ６ -ΔL) and the length L ６ ´(=L ６-ΔL) is continuously formed on the rear surface of the second dielectric substrate 21 in a straight line in the X direction with a length of (2×L ６ ´(=L ６ -ΔL) + W ２ ) is formed as a single strip conductor pattern.

[0271] Embodiment 5. A high-frequency variable filter circuit according to embodiment 5 will be described using Figures 39 to 41. The high-frequency variable filter circuit according to embodiment 5 is the same as the high-frequency variable filter circuit according to embodiment 4 except 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. In Figures 39 to 41, the same reference numerals as those in Figures 1 to 15, 20 to 27, and 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 embodiment 4. As shown in Fig. 41 , the first matching strip conductor pattern 24 is disposed 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 on the first substrate 10, and extending orthogonal to the first input / output line portion 13A1, that is, in a direction (X direction) orthogonal 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 The first matching strip conductor pattern 24 has a length L ｘ , width W １ The conductive foil is a linear conductive foil, such as a copper foil.

[0274] The length L of the first matching strip conductor pattern 24 is the same as the width of the first input / output line portion 13A1 of the signal conductor pattern 13A, and the left and right sides of the first matching strip conductor pattern 24 are arranged in mirror symmetry with respect to the center. ｘ is the length L of the ninth strip conductor pattern 22B ６ and the length L of the 15th strip conductor pattern 23B ６ The sum of (2 x L ６ ) shorter than (L ｘ <2 x L ６ 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 of the second substrate 20, with its central portion facing the second input / output line portion 13A2 of the signal conductor pattern 13A on 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 The second matching strip conductor pattern 25 has a length L ｘ , width W １ The conductive foil is a linear conductive foil, such as a copper foil.

[0277] The second matching strip conductor pattern 25 has a central length equal to the width of the second input / output line portion 13A2 of the signal conductor pattern 13A, and is arranged mirror-symmetrically on the left and right sides with respect to the central length L of the second matching strip conductor pattern 25. ｘ is the length L of the twelfth strip conductor pattern 22C ６and the length L of the 18th strip conductor pattern 23C ６ The sum of (2 x L ６ ) shorter than (L ｘ <2 x L ６ The length L of the second matching strip conductor pattern 25 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

[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 front 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 conductive. 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 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 the passband including the lower limit frequency of the fundamental wave, 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 and the lower limit frequency f of the triplet of the fundamental wave. ３Ｌ and frequency f ３Ｌ The frequency characteristics in the vicinity of the frequency including６ and the length L of the 15th strip conductor pattern 23B ６ and , so there is no effect from the first matching strip conductor pattern 24. Therefore, the passage of the second and third harmonics of the fundamental harmonic in the high-frequency signal propagating between the first input / output terminal 13 a and the second input / output terminal 13 b is blocked.

[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 of the high frequency signal propagating through the signal conductor pattern 13A when the distance d is close to zero. ２Ｌ and frequency f ２Ｌ and the lower limit frequency f of the triplet of the fundamental wave. ３Ｌ and frequency f ３Ｌ The frequency characteristics at frequencies in the vicinity including .gamma. 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 the passband including the lower limit frequency of the fundamental wave, 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 and the lower limit frequency f of the triplet of the fundamental wave. ３Ｌ and frequency f ３Ｌ The frequency characteristics in the vicinity of the frequency including ６ and the length L of the 18th strip conductor pattern 23C ６and , so there is no effect from the second matching strip conductor pattern 25. Therefore, the passage of the second and third harmonics of the fundamental harmonic in the high-frequency signal propagating between the first input / output terminal 13 a and the second input / output terminal 13 b is blocked.

[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 of the high frequency signal propagating through the signal conductor pattern 13A when the distance d is close to zero. ２Ｌ and frequency f ２Ｌ and the lower limit frequency f of the triplet of the fundamental wave. ３Ｌ and frequency f ３Ｌ The frequency characteristics at frequencies in the vicinity including .gamma. 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 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), the first matching strip conductor pattern 24 is partly opposed to 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 a distance L. ｙ and the length of the ninth strip conductor pattern 22B is equal to the length L ６ Shorter width W １ The length of the first matching strip conductor pattern 24 is set to a value equal to or less than 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 and the length of the twelfth strip conductor pattern 22C is equal to the length L ６ Shorter width W １ 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. １ＬThe 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 are spaced apart from each other by an interval W ２ 42. ２ It may be configured so that the gap is filled and continuously formed.

[0297] That is, the signal conductor pattern 13A is arranged at a position mirror-symmetrical with respect to the central axis in the longitudinal direction thereof, and has a length L ３ The third strip conductor pattern 22A and the length L ３ The sixth strip conductor pattern 23A is continuously arranged on the rear surface of the second dielectric substrate 21 in a straight line in the X direction with a length (2×L ３ +W ２ ) is formed as a single strip conductor pattern. ６ The ninth strip conductor pattern 22B and the length L ６ The fifteenth strip conductor pattern 23B is continuously formed on the rear surface of the second dielectric substrate 21 in a straight line in the X direction with a length (2×L ６ +W ２) is formed as a single strip conductor pattern.

[0298] Furthermore, a signal conductor pattern 13A having a length L ６ The twelfth strip conductor pattern 22C and the length L ６ The eighteenth strip conductor pattern 23C is continuously formed on the rear surface of the second dielectric substrate 21 in a straight line in the X direction with a length (2×L ６ +W ２ ) is formed as a single strip conductor pattern.

[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.

[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 devices in microwave and millimeter-wave communication systems. The high-frequency variable filter circuit according to the present disclosure is also suitable for use as a high-frequency variable filter circuit in communication devices in microwave and millimeter-wave communication systems, and is particularly preferably used as a low-pass filter.

[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 connecting line portion, 13A4 Second connecting 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 Fourth strip conductor pattern, 16b Fifth strip conductor pattern, 16c Thirteenth strip conductor pattern, 16d Fourteenth strip conductor pattern, 16e Sixteenth strip conductor pattern, 16f Seventeenth strip conductor pattern, 20 Second substrate, 21 Second dielectric substrate, 22, 22A Third strip conductor pattern, 22B Ninth strip conductor pattern, 22C Twelfth strip conductor pattern, 23, 23A Sixth strip conductor pattern, 23B Fifteenth strip conductor pattern, 23C Eighteenth strip conductor pattern, 24 First matching strip conductor pattern, 25 Second matching strip conductor pattern, 30 Movable plate.

Claims

1. A variable resonator comprising: a first substrate having a first dielectric substrate, a ground conductor arranged on the back surface of the first dielectric substrate, a signal conductor pattern arranged on the 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 back surface of the second dielectric substrate, the third strip conductor pattern being opposed to the first strip conductor pattern and the second strip conductor pattern; and a movable plate connected to the front surface of the second substrate, which can be moved 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 which adjusts the distance between the front surface of the first substrate and the back surface of the second substrate.

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

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

4. A variable resonator as claimed in any one of claims 1 to 3, wherein the first substrate has a fourth strip conductor pattern arranged on the 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 arranged on the surface of the first dielectric substrate at a distance from the other end of the fourth strip conductor pattern, and the second substrate has a sixth strip conductor pattern arranged on the back surface of the second dielectric substrate opposite the fourth strip conductor pattern and the fifth strip conductor pattern.

5. A variable resonator as described in claim 4, wherein 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, and the length of the sixth strip conductor pattern is the same as the length of the third strip conductor pattern.

6. A variable resonator according to claim 5, wherein the fourth strip conductor pattern and the fifth strip conductor pattern are arranged mirror-symmetrically with respect to the longitudinal central axis of the first strip conductor pattern, the second strip conductor pattern and the signal conductor pattern.

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. 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 the 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 the back surface of the second dielectric substrate so as to face the fourth strip conductor pattern and the fifth strip conductor pattern; and the length L of each of the first strip conductor pattern and the fourth strip conductor pattern is １ is a quarter of the propagation wavelength at an upper limit frequency at which propagation of a high frequency signal propagating through the signal conductor pattern is blocked, and the lengths of the second strip conductor pattern and the fifth strip conductor pattern are defined as L ２ Then, the lengths L of the third strip conductor pattern and the sixth strip conductor pattern are ３ However, the length L １ and the distance S between the other end of the first strip conductor pattern and one end of the second strip conductor pattern, and １ and the length L ２ and the interval S. The variable resonator according to claim 1 .

10. A variable resonator comprising: a first substrate which is a microstrip substrate having a first dielectric substrate, a ground conductor arranged on the back surface of the first dielectric substrate, a signal conductor pattern arranged on the 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 arranged opposite to the front surface of the first dielectric substrate, and a second substrate which is a coupling adjustment substrate which has a coupling adjustment conductor pattern on the back surface of the second dielectric substrate for adjusting the coupling, which is the rate of electromagnetic coupling with the stub conductor pattern, and which can be moved up and down relative to the first substrate.

11. A first dielectric substrate, a ground conductor arranged on the rear surface of the first dielectric substrate, a signal conductor pattern arranged on the front surface of the first dielectric substrate and 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 strip conductor pattern arranged on the front surface of the first dielectric substrate and one end electrically connected to one side of a junction between the other end of the first connecting line portion and one end of the second connecting line portion of the signal conductor pattern, 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 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 arranged on a rear surface of the second dielectric substrate to face the first strip conductor pattern and the second strip conductor pattern, a ninth strip conductor pattern arranged on the rear surface of the second dielectric substrate to face the seventh strip conductor pattern and the eighth strip conductor pattern, and a twelfth strip conductor pattern arranged on the rear surface of the second dielectric substrate to face the tenth strip conductor pattern and the eleventh strip conductor pattern; and a movable plate connected to a 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, for adjusting a distance between the front surface of the first substrate and the rear surface of the second substrate.

12. Length L of the first strip conductor pattern １ is a quarter of the propagation wavelength at the upper limit frequency at which the propagation of a high frequency signal propagating through the signal conductor pattern is blocked, and the length L of the third strip conductor pattern ３ is a quarter of the propagation wavelength at the lowest frequency at which the propagation of a high-frequency signal propagating through the signal conductor pattern is blocked, and 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 interval S between the other end of the first strip conductor pattern and one end of the second strip conductor pattern, and the length L of each of the seventh strip conductor pattern and the tenth strip conductor pattern ４ is the length L １ the length L of each of the ninth strip conductor pattern and the twelfth strip conductor pattern is two-thirds of the length L of the ninth strip conductor pattern. ６ is the length L ３ the length L of the eighth strip conductor pattern is 2 / 3 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, and the length L of the eleventh strip conductor pattern ５ is the length L ６ from the length L ４ and a sum of a distance S between the other end of the ninth strip conductor pattern and one end of the eleventh strip conductor pattern.

13. A high-frequency variable filter circuit according to claim 12, wherein the high-frequency signal that is blocked from propagating through the signal conductor pattern is a second harmonic of the fundamental wave of the high-frequency signal that is propagating through the signal conductor pattern.

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

15. A high-frequency variable filter circuit as claimed in any one of claims 11 to 14, wherein the second substrate has a first matching strip conductor pattern, a portion of which is arranged on the back surface of the second dielectric substrate facing a first input / output line portion in the signal conductor pattern, and a second matching strip conductor pattern, a portion of which is arranged on the back surface of the second dielectric substrate facing a second input / output line portion in the signal conductor pattern.

16. A high-frequency variable filter circuit as described in 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 the 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 connecting line portion and one end of the second connecting 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 one end of the first connecting 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 connecting 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; 15. The high-frequency variable filter circuit according to claim 11, wherein 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 on the rear surface of the second dielectric substrate.

18. The high-frequency variable filter circuit according to claim 17, wherein 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, and the length of the eighteenth strip conductor pattern is the same as the length of the twelfth strip conductor pattern.

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

20. A high-frequency variable filter circuit as described in claim 19, wherein the third strip conductor pattern and the sixth strip conductor pattern are arranged in a straight line, the ninth strip conductor pattern and the fifteenth strip conductor pattern are arranged in a straight line, and the twelfth strip conductor pattern and the eighteenth strip conductor pattern are arranged in a straight line.

21. A high-frequency variable filter circuit according to claim 20, wherein 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, and the twelfth strip conductor pattern and the eighteenth strip conductor pattern are formed continuously.

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 connecting line portion and one end of the second connecting 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 one end of the first connecting 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 connecting 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 to the fourth strip conductor pattern and the fifth strip conductor pattern on the rear surface of the second dielectric substrate, a fifteenth strip conductor pattern arranged opposite to the thirteenth strip conductor pattern and the fourteenth strip conductor pattern on the rear surface of the second dielectric substrate, and an eighteenth strip conductor pattern arranged opposite to the sixteenth strip conductor pattern and the seventeenth strip conductor pattern on the rear surface of the second dielectric substrate, and a length L of each of the first strip conductor pattern and the fourth strip conductor pattern １ is a quarter of the propagation wavelength at an upper limit frequency at which propagation of a high frequency signal propagating through the signal conductor pattern is blocked, and the lengths of the second strip conductor pattern and the fifth strip conductor pattern are defined as L ２ Then, the lengths L of the third strip conductor pattern and the sixth strip conductor pattern are ３ However, the length L １ and the distance S between the other end of the first strip conductor pattern and one end of the second strip conductor pattern, and １ and the length L ２ and the interval S, and 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 is shorter than the sum of ４ is the length L １ 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 each set to L ５ Then, the length L of each of the ninth strip conductor pattern and the fifteenth strip conductor pattern is 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, and the length L of each of the twelfth strip conductor pattern and the eighteenth strip conductor pattern is shorter than the sum of ６ However, the length L ４ and the sum of 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.

23. A high-frequency variable filter circuit as described in claim 17, wherein the second substrate has a first matching strip conductor pattern on the back surface of the second dielectric substrate, the central portion of which faces a first input / output line portion in the signal conductor pattern and is arranged perpendicular to the first input / output line portion, and a second matching strip conductor pattern on the back surface of the second dielectric substrate, the central portion of which faces a second input / output line portion in the signal conductor pattern and is arranged perpendicular to the second input / output line portion.

24. A high-frequency variable filter circuit as described in 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 the lower limit frequency of the fundamental wave of the high-frequency signal propagating through the signal conductor pattern.

25. A high-frequency variable filter circuit as described in claim 23, wherein the 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, and 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.

26. A first dielectric substrate, a ground conductor disposed on the rear surface of the first dielectric substrate, and a signal conductor pattern disposed on the front surface of the first dielectric substrate and 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 third harmonics in a high frequency signal propagating through the signal conductor pattern; and a second 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 adjustment substrate and which is movable up and down relative to the first substrate, the second substrate having a back surface thereof disposed opposite to the front surface of the first dielectric substrate, a first coupling adjustment 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 adjustment 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 adjustment 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.

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