Radio wave absorbing element and assembly

Abstract

To cut off electromagnetic waves of a predetermined frequency band.SOLUTION: An electric wave absorption element comprises: a first resonator extending in a first surface direction; a second resonator separated from the first resonator in a first direction and extending in the first surface direction; a third resonator located between the first resonator and the second resonators in the first direction and configured so as to be magnetically or capacitively connected or electrically connected with each of the first resonator and the second resonator; a reference conductor located between the first resonator and the second resonator in the first direction, extending in the first surface direction and giving a potential reference for the first resonator and the second resonator; and a shield conductor separated from the second resonator in the first direction and extending in the first surface direction. The reference conductor is configured to surround at least a part of the third resonator in the first surface direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to an electromagnetic wave absorbing element and an assembly. [Background technology]

[0002] There are known techniques for controlling electromagnetic waves without using a dielectric lens. For example, Patent Document 1 describes a technique for absorbing radio waves in a structure in which resonator elements are arranged. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 61-88591 Summary of the Invention [Problem to be solved by the invention]

[0004] The resonator element as described in Patent Document 1 has an impedance conversion layer, and therefore has a problem of being thick.

[0005] An object of the present disclosure is to provide a radio wave absorbing element and assembly capable of blocking electromagnetic waves in a predetermined frequency band. [Means for solving the problem]

[0006] The radio wave absorption element according to the present disclosure includes a first resonator extending in a first surface direction, a second resonator spaced apart from the first resonator in the first direction and extending in the first surface direction, a third resonator located between the first resonator and the second resonator in the first direction and configured to be magnetically or capacitively connected to each of the first resonator and the second resonator or to be electrically connected to each of the first resonator and the second resonator, a reference conductor extending in the first surface direction and located between the first resonator and the second resonator in the first direction and serving as a potential reference for the first resonator and the second resonator, and a shielding conductor spaced apart from the second resonator in the first direction and extending in the first surface direction, wherein the reference conductor is configured to surround at least a portion of the third resonator in the first surface direction.

[0007] The assembly according to the present disclosure includes a plurality of radio wave absorbing elements according to the present disclosure, and the plurality of radio wave absorbing elements are arranged in the first surface direction. Effect of the Invention

[0008] According to the present disclosure, it is possible to block electromagnetic waves in a predetermined frequency band. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram for explaining an overview of an assembly according to an embodiment. [Diagram 2] FIG. 2 is a diagram showing a configuration of a unit structure according to the embodiment. [Diagram 3] FIG. 3 is a graph showing frequency characteristics of the unit structure according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The present disclosure is not limited to the embodiments described below.

[0011] In the following description, an XYZ Cartesian coordinate system is set, and the positional relationship of each part is described with reference to this XYZ Cartesian coordinate system. The direction parallel to the X-axis in a horizontal plane is defined as the X-axis direction, the direction parallel to the Y-axis in the horizontal plane perpendicular to the X-axis is defined as the Y-axis direction, and the direction parallel to the Z-axis perpendicular to the horizontal plane is defined as the Z-axis direction. Furthermore, a plane including the X-axis and Y-axis is appropriately referred to as the XY plane, a plane including the X-axis and Z-axis is appropriately referred to as the XZ plane, and a plane including the Y-axis and 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 perpendicular to each other.

[0012] [overview] Fig. 1 shows an assembly in which a number of unit structures are periodically arranged. The assembly has a function as a group of the periodically arranged unit structures. For example, the assembly can function as a radio wave absorbing plate that blocks radio waves in a specific frequency band.

[0013] As shown in FIG. 1, the assembly 1 includes a plurality of unit structures 10 and a substrate 12 .

[0014] The multiple unit structures 10 are arranged in the XY plane direction. The XY plane direction may also be called the first plane direction. That is, the multiple unit structures 10 are arranged two-dimensionally. Each of the multiple unit structures 10 has a structure that blocks radio waves. The structure of the unit structures 10 will be described later. The unit structures 10 may also be called radio wave absorbing elements. The substrate 12 may be, for example, a dielectric substrate formed of a dielectric material. The assembly 1 is formed by arranging the multiple unit structures 10 two-dimensionally on the substrate 12 made of a dielectric material.

[0015] In the present disclosure, an assembly can be formed by arranging unit structures of the following embodiments as shown in FIG.

[0016] [Embodiment] The configuration of the unit structure according to the embodiment will be described with reference to Fig. 2. Fig. 2 is a diagram showing the configuration of the unit structure according to the embodiment.

[0017] As shown in FIG. 2, the unit structure 10 includes a substrate 12, a first resonator 14, a second resonator 16, a reference conductor 18, a connecting line 20, and a shielding conductor 24.

[0018] The first resonators 14 may be arranged on the substrate 12 so as to extend across the XY plane. The first resonators 14 may be formed of a conductor. The first resonators 14 may be, for example, patch conductors formed in a rectangular shape. In the example shown in FIG. 2, the first resonators 14 are shown as rectangular patch conductors, but the present disclosure is not limited thereto. The shape of the first resonators 14 may be, for example, linear, circular, loop, or polygonal except for rectangular. That is, the shape of the first resonators 14 may be arbitrarily changed depending on the design. The first resonators 14 are configured to resonate with electromagnetic waves received from the +Z axis direction.

[0019] The first resonator 14 is configured to radiate electromagnetic waves when resonating. The first resonator 14 is configured to radiate electromagnetic waves in the +Z-axis direction when resonating.

[0020] The second resonators 16 may be arranged on the substrate 12 so as to spread across the XY plane at positions away from the first resonators 14 in the Z-axis direction. The second resonators 16 may be, for example, patch conductors formed in a rectangular shape. In the example shown in FIG. 2, the second resonators 16 are shown as rectangular patch conductors, but the present disclosure is not limited thereto. The shape of the second resonators 16 may be, for example, linear, circular, loop, or polygonal except for rectangular. That is, the shape of the second resonators 16 may be arbitrarily changed depending on the design. The shape of the second resonators 16 may be the same as or different from the shape of the first resonators 14. The area of ​​the second resonators 16 may be the same as or different from the area of ​​the first resonators 14.

[0021] The second resonator 16 is configured to radiate electromagnetic waves when resonating. The second resonator 16 is configured to radiate electromagnetic waves, for example, in the -Z axis direction. The second resonator 16 is configured to radiate electromagnetic waves in the -Z axis direction when resonating. The second resonator 16 is configured to resonate by receiving electromagnetic waves from the -Z axis direction.

[0022] The second resonator 16 may be configured to resonate in a different phase from the first resonator 14. The second resonator 16 may be configured to resonate in a different direction from the first resonator 14 in the XY plane direction. For example, when the first resonator 14 is configured to resonate in the X-axis direction, the second resonator 16 may be configured to resonate in the Y-axis direction. The resonance direction of the second resonator 16 may be configured to change over time in the XY plane direction in response to the change over time of the resonance direction of the first resonator 14. The second resonator 16 may be configured to radiate the electromagnetic wave received by the first resonator 14 with the first frequency band attenuated.

[0023] The reference conductor 18 may be arranged between the first resonator 14 and the second resonator 16 on the substrate 12. The reference conductor 18 may be, for example, at the center of the first resonator 14 and the second resonator 16 on the substrate 12, but the present disclosure is not limited thereto. The reference conductor 18 may be, for example, at a position where the distance between the reference conductor 18 and the first resonator 14 is different from the distance between the reference conductor 18 and the second resonator 16. The reference conductor 18 has a through hole 18a through which the connection line 20 passes. The reference conductor 18 is configured to surround at least a portion of the connection line 20.

[0024] The connection line 20 may be formed of a conductor. The connection line 20 is located between the first resonator 14 and the second resonator 16 in the Z-axis direction. The Z-axis direction may be referred to as, for example, a first direction. The connection line 20 may be connected to each of the first resonator 14 and the second resonator 16. The connection line 20 passes through the through hole 18a but does not contact the reference conductor 18. The connection line 20 may be configured to be magnetically or capacitively connected to each of the first resonator 14 and the second resonator 16, for example. The connection line 20 may be configured to be electrically connected to each of the first resonator 14 and the second resonator 16, for example. The connection line 20 is connected to a side of the first resonator 14 that is parallel to the X-axis direction, and is connected to a side of the second resonator 16 that is parallel to the X-axis direction. The connection line 20 may be a path that is parallel to the Z-axis direction. The connection line 20 may be a third resonator.

[0025] The shielding conductor 24 is made of a conductor. The shielding conductors 24 are lined up below the second resonators 16 in the Z-axis direction. The shielding conductors 24 are lined up so as to receive the electromagnetic waves emitted from the second resonators 16. The shielding conductors 24 are lined up so as to prevent the electromagnetic waves incident on the first resonators 14 from being emitted from the unit structure 10. In other words, the shielding conductors 24 are configured to shield the electromagnetic waves received by the first resonators 14. The shielding conductors 24 are configured to shield the electromagnetic waves radiated by the second resonators 16.

[0026] The frequency characteristics of the unit structure according to the embodiment will be described with reference to Fig. 3. Fig. 3 is a graph showing the frequency characteristics of the unit structure according to the embodiment.

[0027] In FIG. 3, the horizontal axis indicates frequency [GHz (Giga Hertz)], and the vertical axis indicates gain [dB (deci Bel)]. Graph G1 is shown in FIG. 3. Graph G1 indicates a transmission coefficient. As shown in graph G1, the unit structure 10 has an insertion loss of -2.50 dB or more in the range from about 18.00 GHz to about 28.00 GHz. The unit structure 10 has an insertion loss of -17.50 dB or less in the range from about 21.50 GHz. The unit structure 10 is configured not to transmit electromagnetic waves in a frequency band near 21.50 GHz. That is, the unit structure 10 is configured not to transmit electromagnetic waves in a specific frequency band. The unit structure 10 can block electromagnetic waves of a specific frequency. The frequency to be blocked can be changed according to the resonance frequency of the unit structure 10.

[0028] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the contents of these embodiments. The above-mentioned components include those that a person skilled in the art can easily imagine, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the above-mentioned components can be appropriately combined. Furthermore, various omissions, substitutions, or modifications of the components can be made without departing from the gist of the above-mentioned embodiments. [Explanation of symbols]

[0029] 1 aggregate 10 Unit Structure 12 Substrate 14 1st resonator 16 Second resonator 18 Reference Conductor 20 Connecting Lines 22 Third resonator 24 Shielded Conductor

Claims

1. a first resonator extending across a first surface; a second resonator spaced apart from the first resonator in a first direction perpendicular to the first surface and extending across the first surface; a third resonator located between the first resonator and the second resonator in the first direction and configured to magnetically or capacitively couple to, or electrically couple to, each of the first resonator and the second resonator; a reference conductor that extends across the first surface, is located between the first resonator and the second resonator in the first direction, and serves as a potential reference for the first resonator and the second resonator; a shielding conductor spaced apart from the second resonator in the first direction and extending across the first surface; The reference conductor has a through hole. The third resonator is configured to pass through the through hole and not to contact the reference conductor. Radio wave absorbing element.

2. The shielding conductor is configured to shield an electromagnetic wave received by the first resonator.

2. The radio wave absorbing element according to claim 1.

3. The shielding conductor is configured to shield electromagnetic waves radiated by the second resonator.

3. The radio wave absorbing element according to claim 1 or 2.

4. A radio wave absorbing element according to any one of claims 1 to 3, The plurality of radio wave absorbing elements are arranged on the first surface. collective.

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