Radio wave reflecting plate and composite resonator

Abstract

The radio wave reflecting plate includes: a plurality of unit structures arranged in a first surface direction; and a reference conductor that serves as a reference potential for the plurality of unit structures. The plurality of unit structures are represented by an equivalent circuit having two or more resonance circuits. A reference conductor is disposed at a lower portion of the resonator in the first direction.

Description

Technical Field

[0001] The present disclosure relates to a radio wave reflection plate and a composite resonator. Background Art

[0002] There are known technologies for controlling electromagnetic waves without using dielectric lenses. For example, Patent Document 1 describes a technology for refracting electromagnetic waves by changing the parameters of each element in a structure in which resonator elements are arranged.

[0003] Prior Art Literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-231182 Summary of the invention

[0006] The radio wave reflection plate disclosed in the present invention includes: a plurality of unit structures arranged in a first surface direction; and a reference conductor serving as a reference potential of the plurality of unit structures, wherein the plurality of unit structures are represented by an equivalent circuit having two or more resonant circuits, and the reference conductor is arranged at a lower portion of the resonator in the first direction.

[0007] The radio wave reflection plate disclosed in the present invention includes: a plurality of unit structures arranged in a first surface direction; and a reference conductor serving as a reference potential of the plurality of unit structures, the plurality of unit structures including: two or more resonators extending in the first direction; and a connection portion between the resonators including a magnetic connection or a capacitive connection of the reference conductor, the reference conductor being arranged at a lower portion of the resonator in the first direction.

[0008] The radio wave reflection plate disclosed in the present invention includes: a plurality of unit structures arranged in a first surface direction; and a reference conductor serving as a reference potential of the plurality of unit structures, the plurality of unit structures including: a first resonator extending in the first surface direction; a second resonator separated from the first resonator in the first direction and extending in the first surface direction; and a connection portion magnetically or capacitively connecting the first resonator and the second resonator in the first direction, the reference conductor being arranged at lower portions of the first resonator and the second resonator in the first direction.

[0009] The radio wave reflection plate disclosed in the present invention comprises: a plurality of unit structures arranged in a first surface direction; and a reference conductor connected throughout the plurality of unit structures and serving as a reference potential, and has a first resonator that performs input and output of electromagnetic waves to and is coupled with a free space, the first resonator being electromagnetically coupled to one or more third resonator groups arranged in a stacking direction, and further, main coupling is performed between these resonators in a subordinate manner, and is expressed by an equivalent circuit characterized by coupling and frequency adjustment performed by the reference conductor, the reference conductor being arranged at a lower portion of the first resonator in the first direction.

[0010] The composite resonator of the present disclosure is expressed as an equivalent circuit including two or more resonant circuits, and a reference conductor is arranged at a lower portion of the resonator in a first direction.

[0011] The composite resonator disclosed herein includes two or more resonators extending in a first direction, and includes a connection portion of a reference conductor connected magnetically or capacitively between the resonators, wherein the reference conductor is arranged below the resonator in the first direction.

[0012] The composite resonator disclosed in the present invention includes: a first resonator extending in the first surface direction; a second resonator separated from the first resonator in the first direction and extending in the first surface direction; a connecting portion magnetically or capacitively connecting the first resonator and the second resonator in the first direction; and a reference conductor arranged at the lower part of the first resonator and the second resonator in the first direction.

[0013] The composite resonator disclosed in the present invention includes a first resonator that performs input and output of electromagnetic waves to and is coupled with a free space, the first resonator being electromagnetically coupled to one or more third resonator groups arranged in a stacking direction, and further, main coupling is performed between these resonators in a subordinate manner, and is expressed by an equivalent circuit characterized by coupling and frequency adjustment through a reference conductor, the reference conductor being arranged at a lower portion of the first resonator in the first direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a diagram for explaining the outline of the radio wave reflection plate according to the embodiment.

[0015] Figure 2 It is a diagram showing a structural example of a unit structure involved in the embodiment.

[0016] Figure 3 It is a diagram showing a configuration example of a coupling conductor according to an embodiment.

[0017] Figure 4 This is a diagram showing an example of the phase characteristic of the unit structure according to the comparative example.

[0018] Figure 5 This is a diagram showing an example of the phase characteristics of the unit structure of the first example involved in the embodiment.

[0019] Figure 6 This is a diagram showing an example of the phase characteristics of the unit structure of the second example involved in the embodiment. DETAILED DESCRIPTION

[0020] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments, and in the following embodiments, the same parts are denoted by the same reference numerals to omit repeated descriptions.

[0021] In the following description, an XYZ orthogonal coordinate system is set, and the positional relationship of each part is described while referring to the XYZ orthogonal coordinate system. The direction parallel to the X-axis in the horizontal plane is set as the X-axis direction, the direction parallel to the Y-axis in the horizontal plane orthogonal to the X-axis is set as the Y-axis direction, and the direction parallel to the Z-axis orthogonal to the horizontal plane is set as the Z-axis direction. In addition, the plane containing the X-axis and the Y-axis is appropriately referred to as the XY plane, the plane containing the X-axis and the Z-axis is appropriately referred to as the XZ plane, and the plane containing the Y-axis and the Z-axis is appropriately referred to as the YZ plane. The XY plane is parallel to the horizontal plane. The XY plane, the XZ plane, and the YZ plane are orthogonal.

[0022] [Implementation Method]

[0023] (Radio wave reflector)

[0024] use Figure 1 The outline of the radio wave reflection plate according to the embodiment will be described. Figure 1 It is a diagram for explaining the outline of the radio wave reflection plate according to the embodiment.

[0025] The radio wave reflector 1 is a plate-shaped member configured to transmit radio waves transmitted by the base station. The radio wave reflector 1 is configured to, for example, reflect the radio waves transmitted by the base station at a given angle and emit the radio waves. The radio wave reflector 1 may contain, for example, a metamaterial that changes the phase of the incident wave.

[0026] like Figure 1 As shown, the radio wave reflection plate 1 can include, for example, a substrate 2 , a unit structure 10 a , a unit structure 10 b , a unit structure 10 c , and a unit structure 10 d .

[0027] The unit structures 10a, 10b, 10c, and 10d can be formed on a substrate 2. The substrate 2 can have a rectangular shape, for example, but is not limited thereto. The unit structures 10a, 10b, 10c, and 10d can be arranged two-dimensionally on the substrate 2. The substrate 2 can be a dielectric substrate containing a dielectric, for example.

[0028] Specifically, in the substrate 2, at the lowest level of the substrate 2, a plurality of unit structures 10a can be set as one example. In the substrate 2, at the level above the level where the unit structure 10a is set, a plurality of unit structures 10b can be set in a row. In the substrate 2, at the level above the level where the unit structure 10b is set, a plurality of unit structures 10c can be set in a row. In the substrate 2, at the level above the level where the unit structure 10c is set, a plurality of unit structures 10d can be set in a row. That is, the radio wave reflection plate 1 can have a structure in which a plurality of unit structures of different sizes are periodically arranged. The unit structures 10a to 10d can respectively make the frequency band and the amount of change of the phase of the radio wave to be changed different. The unit structures 10a to 10d each have a rectangular shape, but are not limited thereto. The frequency band and the amount of change of the phase of the radio wave to be reflected can be adjusted by changing the size and shape of the unit structures 10a, 10b, 10c and 10d.

[0029] [Unit structure]

[0030] use Figure 2 A structural example of the unit structure according to the embodiment will be described. Figure 2 It is a diagram showing a structural example of a unit structure involved in the embodiment.

[0031] like Figure 2 As shown, the unit structure 10 includes a substrate 12, a first resonator 14, a coupling conductor 16, a second resonator 18, and a reflection conductor (reference conductor) 20. The unit structure 10 has a four-layer structure in which conductors are stacked in four layers. The unit structure 10 is stacked in the order of the reflection conductor 20, the second resonator 18, the coupling conductor 16, and the first resonator 14 from the bottom.

[0032] The first resonator 14 is formed in the uppermost layer. The first resonator 14 extends in the XY plane. The first resonator 14 can be, for example, a pad conductor formed in a rectangular shape, but the present disclosure is not limited thereto. The shape of the first resonator 14 can be, for example, linear, circular, ring-shaped, or a polygonal shape other than a rectangle. The shape of the first resonator 14 can be arbitrarily changed according to the design. The first resonator 14 is configured to resonate by electromagnetic waves received from the +Z axis direction. The first resonator 14 does not contact the end of the substrate 12. The size of the first resonator 14 can be arbitrarily changed according to the design.

[0033] The coupling conductor 16 is formed in a layer one layer below the layer in which the first resonator 14 is formed. Figure 3 1 is a diagram showing a configuration example of a coupling conductor 16 according to an embodiment. Figure 3 As shown, the coupling conductor 16 extends in the XY plane. The coupling conductor 16 is configured in a square shape. The coupling conductor 16 has a hole portion 16a, a hole portion 16b, a hole portion 16c, and a hole portion 16d. The hole portion 16a is formed, for example, at the upper left corner of the coupling conductor 16. The hole portion 16b is formed, for example, at the upper right corner of the coupling conductor 16. The hole portion 16c is formed, for example, at the lower left corner of the coupling conductor 16. The hole portion 16d is formed, for example, at the lower right corner of the coupling conductor 16. The hole portion 16a, the hole portion 16b, the hole portion 16c, and the hole portion 16d can be formed, for example, in the same square shape. That is, the coupling conductor 16 is formed from the hole portion 16a to the hole portion 16d so as to have four-fold rotational symmetry. The sizes of the hole portion 16a to the hole portion 16d can be arbitrarily changed according to the design. The coupling conductor 16 can also be referred to as a connecting portion that capacitively connects or magnetically connects the first resonator 14 and the second resonator 18.

[0034] The second resonator 18 is formed in a layer below the layer on which the coupling conductor 16 is formed. The second resonator 18 extends in the XY plane. The second resonator 18 can be, for example, a pad conductor formed in a rectangular shape, but the present disclosure is not limited thereto. The shape of the second resonator 18 can also be, for example, a linear shape, a circular shape, a ring shape, or a polygonal shape other than a rectangular shape. The shape of the second resonator 18 can be arbitrarily changed according to the design. The second resonator 18 is configured to resonate by electromagnetic waves received from the +Z axis direction. The second resonator 18 does not contact the end of the substrate 12. The size of the second resonator 18 can be arbitrarily changed according to the design. The first resonator 14 and the second resonator 18 can be different in shape and size. The first resonator 14 and the second resonator 18 are capacitively connected or magnetically connected via the hole portion 16a to the hole portion 16d of the coupling conductor 16.

[0035] The reflection conductor 20 is formed over the entire surface of the XY plane in the substrate 2. The reflection conductor 20 is arranged on the lowermost surface of the unit structure 10. The reflection conductor 20 includes a conductor. The reflection conductor 20 is configured as a reference conductor (ground conductor). The reflection conductor 20 is configured, for example, to reflect electromagnetic waves received from the +Z axis direction to the +Z axis direction. In addition, the reflection conductor 20 is not limited to being formed over the entire surface of the XY plane. For example, the reflection conductor 20 may be sufficiently large relative to the wavelength of the received radio wave.

[0036] That is, the unit structure 10 can be represented by an equivalent circuit having two LC resonant circuits. The unit structure 10 can be, for example, a structure represented by an equivalent circuit having two or more LC resonant circuits. In other words, the unit structure 10 can include two or more resonators. In this case, the coupling conductor 16 is located between the resonators. In this case, the coupling conductor 16 is configured to connect the resonators magnetically or capacitively.

[0037] In addition, the first resonator 14 of the unit structure 10 can also be said to be a resonator that performs input and output of electromagnetic waves with free space and is coupled with electromagnetic waves. The first resonator 14 can be electromagnetically coupled with a third resonator group including one or more resonators arranged in the Z direction (stacking direction). The main coupling between the multiple resonators can be subordinately coupled between these resonators. In this case, the multiple resonators can be expressed as an equivalent circuit that is coupled and frequency-adjusted through the reflection conductor 20 (reference conductor).

[0038] [Frequency characteristics]

[0039] (Comparative Example)

[0040] use Figure 4 The phase characteristics of the unit structure according to the comparative example will be described. Figure 4 1 is a diagram showing an example of phase characteristics of a unit structure according to a comparative example. In the comparative example, the unit structure has a so-called mushroom structure in which a ground substrate and a metal plate are electromagnetically connected through vias, for example.

[0041] exist Figure 4 , the horizontal axis represents frequency [GHz (gigahertz)], and the vertical axis represents phase [deg]. Graph 101 shows the relationship between frequency and phase. As shown in graph 101, the unit structure involved in the comparative example has nonlinear characteristics with respect to frequency. Therefore, the unit structure involved in the comparative example becomes a structure that targets only a specific frequency, and it is difficult to maintain characteristics over a wide frequency band.

[0042] (Implementation Method)

[0043] use Figure 5 and Figure 6 The phase characteristics of the unit structure according to the embodiment will be described. Figure 5 This is a diagram showing an example of the phase characteristics of the unit structure of the first example involved in the embodiment. Figure 6 This is a diagram showing an example of the phase characteristics of the unit structure of the second example involved in the embodiment.

[0044] exist Figure 5In the figure, the horizontal axis represents frequency [GHz] and the vertical axis represents phase [deg]. Graph 111 represents the relationship between frequency and phase. Graph 121 is an approximate straight line of Graph 111. That is, in a certain frequency band, the relationship between frequency and phase of the unit structure 10 involved in the embodiment shows a linear characteristic. For example, in the frequency band F1 and the frequency band F2, the relationship between frequency and phase of the unit structure 10 involved in the embodiment shows a linear characteristic. Band F1 is, for example, a frequency band of about 24.00 GHz to 26.50 GHz. Band F2 is, for example, an area of ​​about 26.50 GHz to 29.00 GHz. Band F1 and band F2 have a bandwidth of 2.5 GHz. As shown in Graph 111, in the unit structure 10 involved in the embodiment, for example, in the frequency band F1 and the frequency band F2, the frequency and phase show a linear characteristic. Specifically, in the range of the phase of the unit structure 10 involved in the embodiment from -180° to +50°, the frequency and phase show a linear characteristic. Thus, the unit structure 10 involved in the embodiment can reduce the influence of the frequency deviation on the phase in the frequency band F1 and the frequency band F2, so the characteristics of the unit structure 10 can be stabilized over a wide frequency band. In the present disclosure, by changing the design of the unit structure 10, the region where the frequency and phase show linear characteristics can be changed.

[0045] Figure 6 Representation and Figure 5 An example of phase characteristics of different unit structures. Figure 6 In the figure, the horizontal axis represents frequency [GHz] and the vertical axis represents phase [deg]. Graph 112 represents the relationship between frequency and phase. Graph 122 is an approximate curve of Graph 112. For example, in the unit structure 10 involved in the embodiment, the relationship between frequency and phase shows a linear characteristic in the frequency band F3 and the frequency band F4. The frequency band F3 is, for example, a frequency band of about 22.00 GHz to 24.50 GHz. The frequency band F2 is, for example, a region of about 24.50 GHz to 27.00 GHz. The frequency band F3 and the frequency band F3 have a bandwidth of 2.5 GHz. That is, the frequency band F3 and the frequency band F4 are respectively Figure 5 As shown in Figure 112, the frequency band F1 and the frequency band F2 are different frequency bands. Figure 6 In the example shown, the unit structure 10 shows linear characteristics in frequency and phase in the frequency band F3 and the frequency band F4. Figure 6 In the example shown, the unit structure 10 shows linear characteristics in terms of frequency and phase within a range of about -100° to +180°. Figure 5 In the example shown, the unit structure 10 can reduce the influence of the frequency deviation on the phase in the frequency band F3 and the frequency band F4, and therefore the characteristics of the unit structure 10 can be stabilized over a wide frequency band.

[0046] like Figure 5 and Figure 6 As shown, in the unit structure 10, the region where the relationship between frequency and phase shows linear characteristics can be changed by changing the design. For example, in the present disclosure, a unit structure having a linear phase characteristic can be realized over a wide range such as -180° to +180°.

[0047] The above describes the embodiments of the present disclosure, but the present disclosure is not limited by the contents of these embodiments. In addition, the aforementioned constituent elements include constituent elements that can be easily conceived by those skilled in the art, substantially the same constituent elements, and so-called scope constituent elements. Furthermore, the aforementioned constituent elements can be appropriately combined. Furthermore, various omissions, substitutions, or changes of constituent elements can be performed within the scope of the gist of the aforementioned embodiments.

[0048] Explanation of symbols

[0049] 1 Radio wave reflector

[0050] 2,12 base plates

[0051] 10 Unit Construction

[0052] 14. 1st resonator

[0053] 16 Coupling conductor

[0054] 18. Second Resonator

[0055] 20 Reflecting conductor.

Claims

1. A radio wave reflection plate, comprising: A plurality of unit structures arranged in the direction of the first surface; and A reference conductor serving as a reference potential for the plurality of unit structures, The plurality of unit structures are represented by an equivalent circuit having two or more resonant circuits. The reference conductor is arranged at a lower portion of the resonator in the first direction.

2. A radio wave reflection plate, comprising: A plurality of unit structures arranged in the direction of the first surface; and A reference conductor serving as a reference potential for the plurality of unit structures, The plurality of unit structures include: two or more resonators extending in a first direction; and a connection portion between the resonators including a magnetic connection or a capacitive connection of the reference conductor, The reference conductor is disposed at a lower portion of the resonator in the first direction.

3. A radio wave reflection plate, comprising: A plurality of unit structures arranged in the direction of the first surface; and A reference conductor serving as a reference potential for the plurality of unit structures, The plurality of unit structures include: A first resonator extending in the direction of the first surface; a second resonator separated from the first resonator in a first direction and extending in a direction of the first plane; and a connecting portion that magnetically or capacitively connects the first resonator and the second resonator in the first direction, The reference conductor is disposed below the first resonator and the second resonator in the first direction.

4. A radio wave reflection plate, comprising: A plurality of unit structures arranged in the direction of the first surface; and a reference conductor connected throughout the plurality of unit structures and serving as a reference potential, The unit structure includes a first resonator that performs input and output of electromagnetic waves to and is coupled with the free space, The first resonator is electromagnetically coupled to one or more third resonator groups arranged in the stacking direction. Furthermore, the main coupling is the slave coupling between these resonators, It is represented by an equivalent circuit characterized by coupling and frequency adjustment via the reference conductor, The reference conductor is disposed at a lower portion of the first resonator in the first direction.

5. A composite resonator, Expressed as an equivalent circuit with two or more resonant circuits, A reference conductor is arranged at a lower portion of the resonator in the first direction.

6. A composite resonator, comprising: Two or more resonators extending in a first direction; and A connection portion including a magnetic connection or a capacitive connection of a reference conductor between the resonators, The reference conductor is disposed at a lower portion of the resonator in the first direction.

7. A composite resonator, comprising: A first resonator extending in a direction of the first surface; a second resonator separated from the first resonator in a first direction and extending in a direction of the first plane; a connection portion for magnetically or capacitively connecting the first resonator and the second resonator in the first direction; and A reference conductor is disposed below the first resonator and the second resonator in the first direction.

8. A composite resonator comprising a first resonator that performs input and output of electromagnetic waves to and from free space and couples with the electromagnetic waves, The first resonator is electromagnetically coupled to one or more third resonator groups arranged in the stacking direction. Furthermore, the main coupling is the slave coupling between these resonators, It is expressed as an equivalent circuit characterized by coupling through a reference conductor and frequency adjustment. The reference conductor is disposed at a lower portion of the first resonator in the first direction.

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