Radio wave control board

Abstract

This radio wave control plate comprises a plurality of unit structures arranged in a first planar direction. The unit structures are provided with a dielectric layer, and a resonator that is disposed on the dielectric layer and extends in the first planar direction. The dielectric layer is formed from glass fibers and includes a glass fiber layer that extends in the first planar direction.

Description

【Technical Field】 【0001】 The present disclosure relates to a radio wave control plate. 【Background Art】 【0002】 A technique for controlling electromagnetic waves without using a dielectric lens is known. For example, Patent Document 1 describes a technique for refracting radio waves by changing the parameters of each element in a structure in which resonator elements are arranged. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Unexamined Patent Application Publication No. 2015-231182 【Summary of the Invention】 【0004】 The radio wave control plate of the present disclosure includes a plurality of unit structures arranged in the first surface direction, and the unit structure includes a dielectric layer and a resonator disposed on the dielectric layer and extending in the first surface direction. The dielectric layer is formed of glass fiber and includes a glass fiber layer extending in the first surface direction. 【Brief Description of the Drawings】 【0005】 [Figure 1] FIG. 1 is a diagram for explaining the outline of the radio wave control plate according to the first embodiment. [Figure 2] FIG. 2 is a diagram for explaining a configuration example of the unit structure according to the first embodiment. [Figure 3] FIG. 3 is a diagram for explaining the glass fiber layer according to the first embodiment. [Figure 4] FIG. 4 is a diagram for explaining the positional relationship between the resonator and the glass fiber according to the second embodiment. [Figure 5] FIG. 5 is a diagram for explaining the positional relationship between the resonator and the glass fiber according to the first example of the third embodiment. [Figure 6]Figure 6 is a diagram illustrating the positional relationship between the resonator and the glass fiber in the second example of the third embodiment. [Figure 7] Figure 7 is a diagram illustrating the positional relationship between the resonator and the glass fiber according to the third example of the third embodiment. [Modes for carrying out the invention] 【0006】 Embodiments of the present invention will be described in detail below with reference to the attached drawings. However, the present invention is not limited by these embodiments, and in the following embodiments, the same parts are denoted by the same reference numerals to omit redundant explanations. 【0007】 In the following explanation, we will establish an XYZ Cartesian coordinate system and describe the positional relationships of each part while referring to this XYZ Cartesian coordinate system. The direction parallel to the X-axis in the horizontal plane will be defined as the X-axis direction, the direction parallel to the Y-axis in the horizontal plane perpendicular to the X-axis will be defined as the Y-axis direction, and the direction parallel to the Z-axis perpendicular to the horizontal plane will be defined as the Z-axis direction. Furthermore, the plane containing the X-axis and Y-axis will be appropriately referred to as the XY plane, the plane containing the X-axis and Z-axis will be appropriately referred to as the XZ plane, and the plane containing the Y-axis and Z-axis will be appropriately referred to as the YZ plane. The XY plane is parallel to the horizontal plane. The XY plane, XZ plane, and YZ plane are orthogonal to each other. 【0008】 [First Embodiment] (Radio wave control panel) The outline of the radio wave control board according to the first embodiment will be explained using Figure 1. Figure 1 is a diagram illustrating the outline of the radio wave control board according to the first embodiment. 【0009】 The radio wave control plate 1 is a plate-shaped member configured to reflect or transmit (refract) radio waves transmitted by a base station. For example, when the radio wave control plate 1 receives radio waves transmitted by a base station, it is configured to reflect or refract those radio waves at a predetermined angle. The radio wave control plate 1 may be made of, for example, a metamaterial that changes the phase of the incident wave. 【0010】 As shown in Figure 1, the radio wave control board 1 may include, for example, a substrate 2, and unit structures 10a, 10b, 10c, and 10d. When it is not necessary to distinguish between unit structures 10a and 10d, they are collectively referred to as unit structure 10. 【0011】 The unit structures 10a, 10b, 10c, and 10d can be formed on a substrate 2. The substrate 2 may be, for example, a dielectric substrate formed of a dielectric material. The substrate 2 may, for example, have a rectangular shape, but is not limited thereto. The unit structures 10a, 10b, 10c, and 10d can be arranged in two dimensions on the substrate 2. 【0012】 Specifically, on substrate 2, multiple unit structures 10a may be installed on the bottom row of substrate 2 as an example. On substrate 2, multiple unit structures 10b may be installed in a row on the row above the row on which unit structures 10a are installed. On substrate 2, multiple unit structures 10c may be installed in a row on the row above the row on which unit structures 10b are installed. On substrate 2, multiple unit structures 10d may be installed in a row on the row above the row on which unit structures 10c are installed. In other words, the radio wave control board 1 may have a structure in which multiple unit structures of different sizes are arranged periodically. Each of the unit structures 10a to 10d may have different changes in the frequency band and phase of the radio waves they change. Each of the unit structures 10a to 10d has a rectangular shape, but is not limited to this. By changing the size and shape of unit structures 10a, 10b, 10c, and 10d, the frequency band and phase of the radio waves that are reflected or refracted can be adjusted. 【0013】 (Unit structure) An example of the configuration of a unit structure according to the first embodiment will be explained using Figure 2. Figure 2 is a diagram illustrating an example of the configuration of a unit structure according to the first embodiment. 【0014】 As shown in Figure 2, the unit structure 10 includes a resonator 20. 【0015】 The resonator 20 is formed on the uppermost surface of the substrate 2. The resonator 20 extends in the XY plane. The XY plane is also called the first plane. The resonator 20 is formed of, for example, a conductive material. The resonator 20 may be formed in a rectangular shape, for example. The shape of the resonator 20 is not limited to a rectangle. The shape of the resonator 20 may be arbitrarily changed depending on the design. 【0016】 A ground conductor may be formed on the bottom surface of the unit structure 10, for example. The unit structure 10 may also have a multi-stage configuration. 【0017】 The substrate 2 contains a glass fiber layer 30 formed of glass fibers inside. Since the substrate 2 is a dielectric substrate, it is also called a dielectric layer. In other words, the substrate 2 is a dielectric substrate containing glass fibers. 【0018】 Figure 3 is a diagram illustrating a glass fiber layer according to the first embodiment. As shown in Figure 3, the glass fiber layer 30 includes a plurality of glass fibers 31. The glass fibers 31 are included in a plurality along the X-axis and Y-axis directions. The X-axis and Y-axis directions are a type of first direction and a type of second direction. The glass fiber layer 30 has a mesh-like structure in which glass fibers are woven in the X-axis and Y-axis directions. The spacing between the glass fibers 31 in the X-axis and Y-axis directions may be arbitrary. 【0019】 When the glass fiber 31 is included in the substrate 2, the dielectric constant of the substrate 2 increases, and the dielectric loss also increases. Therefore, in the present embodiment, in order to prevent the dielectric constant of the substrate 2 from becoming too large, it is formed in a mesh shape with gaps between the glass fibers 31 in the X-axis direction and the Y-axis direction. In the present embodiment, the amount of phase change changes according to the positional relationship between the resonator 20 of each unit structure 10 and the glass fiber layer 30. This is because when the positional relationship between the resonator 20 and the glass fiber layer 30 changes, the resonance frequency and the coupling coefficient change. In the present embodiment, since the positional relationship between the resonator 20 and the glass fiber layer 30 changes for each unit structure 10, the amount of phase change varies for each unit structure 10. Thereby, in the present embodiment, the beam width of the radio wave that the radio wave control plate 1 reflects or refracts can be widened. 【0020】 Also, in the first embodiment, in the radio wave control plate 1, it is preferable that the interval between adjacent glass fibers 31 is shifted from an integer multiple of the interval between adjacent unit structures 10. Thereby, the positional relationship between the resonator 20 of each unit structure 10 and the glass fiber layer 30 can be appropriately varied. Therefore, the amount of phase change can be varied for each unit structure 10, so that the beam width of the radio wave that the radio wave control plate 1 reflects or refracts can be more appropriately widened. 【0021】 [Second Embodiment] The positional relationship between the resonator and the glass fiber according to the second embodiment will be described with reference to FIG. 4. FIG. 4 is a diagram for explaining the positional relationship between the resonator and the glass fiber according to the second embodiment. 【0022】 In the second embodiment, for example, when the radio wave control plate 1 is viewed from the Z-axis direction, it is formed such that the number of glass fibers 31 overlapping the end portion of the resonator 20 varies for each unit structure. The Z-axis direction is a kind of third direction. 【0023】 FIG. 4 shows the resonator 20-1 of one unit structure 10 and the resonator 20-2 of the other unit structure 10 in the radio wave control plate 1. 【0024】 The resonator 20-1 is formed in a rectangular shape. The resonator 20-1 has end 21-1, end 22-1, end 23-1, and end 24-1. 【0025】 The resonator 20-2 is formed in a rectangular shape. The resonator 20-2 has end 21-2, end 22-2, end 23-2, and end 24-2. 【0026】 In the example shown in Figure 4, the number of glass fibers 31 overlapping with resonator 20-1 and the number of glass fibers 31 overlapping with resonator 20-2 are different when viewed from the Z-axis direction. Specifically, the number of glass fibers 31 overlapping with ends 21-1 to 21-4 of resonator 20-1 and the number of glass fibers 31 overlapping with ends 22-1 to 22-4 of resonator 20-2 are different when viewed from the Z-axis direction. 【0027】 Viewed from the Z-axis direction, there are 6 glass fibers 31 parallel to the Y-axis direction that overlap with the ends 21-1 to 24-1 of the resonator 20-1. Viewed from the Z-axis direction, there are 9 glass fibers 31 parallel to the X-axis direction that overlap with the ends 21-1 to 24-1 of the resonator 20-1. 【0028】 Viewed from the Z-axis direction, there are 5 glass fibers 31 parallel to the Y-axis direction that overlap with the ends 21-2 to 24-2 of the resonator 20-2. Viewed from the Z-axis direction, there are 9 glass fibers 31 parallel to the X-axis direction that overlap with the ends 21-2 to 24-2 of the resonator 20-2. 【0029】 In other words, in the example shown in Figure 4, the number of glass fibers 31 parallel to the Y-axis direction that overlap with the ends 21-1 to 24-1 of resonator 20-1, as viewed from the Z-axis direction, is different from the number of glass fibers 31 parallel to the Y-axis direction that overlap with the ends 21-2 to 24-2 of resonator 20-2. As viewed from the Z-axis direction, the number of glass fibers 31 parallel to the X-axis direction that overlap with the ends 21-1 to 24-1 of resonator 20-1, is the same from the number of glass fibers 31 parallel to the X-axis direction that overlap with the ends 21-2 to 24-2 of resonator 20-2. In this embodiment, as viewed from the Z-axis direction, the number of glass fibers 31 parallel to the X-axis direction that overlap with the ends 21-1 to 24-1 of resonator 20-1, is different from the number of glass fibers 31 parallel to the X-axis direction that overlap with the ends 21-2 to 24-2 of resonator 20-2. In other words, in this embodiment, when viewed from the Z-axis direction, it is sufficient that the number of glass fibers 31 overlapping the end 21-1 to the end 24-1 of the resonator 20-1 is different from the number of glass fibers 31 overlapping the end 21-2 to the end 24-2 of the resonator 20-2 in at least one of the X-axis and Y-axis directions. 【0030】 In the second embodiment, by making the number of glass fibers 31 overlapping resonator 20-1 and the number of glass fibers 31 overlapping resonator 20-2 different when viewed from the Z-axis direction, the volume of the glass fiber layer 30 overlapping resonator 20-1 and resonator 20-2 can be made different. In the second embodiment, by making the volume of the glass fiber layer 30 overlapping resonator 20-1 and resonator 20-2 different, the amount of phase change can be varied more appropriately for each unit structure 10, so that the beam width can be made wider in an appropriate manner. 【0031】 [Third Embodiment] A third embodiment will now be described. In the third embodiment, for example, when the radio wave control plate 1 is viewed from the Z-axis direction, a unit structure 10 is formed in which the tip of the resonator 20 overlaps with the glass fiber 31, and a unit structure 10 is formed in which the tip of the resonator 20 does not overlap with the glass fiber 31. 【0032】 (Example 1) The positional relationship between the resonator and the glass fiber in the first example of the third embodiment will be explained using Figure 5. Figure 5 is a diagram illustrating the positional relationship between the resonator and the glass fiber in the first example of the third embodiment. 【0033】 In the example shown in Figure 5, for the sake of simplicity, only glass fibers 31 parallel to the Y-axis are shown. 【0034】 The resonator 20-1 has its ends 21-1 and 23-1 positioned parallel to the X-axis direction, and its ends 22-1 and 24-1 positioned parallel to the Y-axis direction. When viewed from the Z-axis direction, the resonator 20-1 is positioned so that its tip 41-1, tip 42-1, tip 43-1, and tip 44-1 overlap with the glass fiber 31. 【0035】 The resonator 20-2 has its ends 21-2 and 23-2 parallel to the X-axis direction, and its ends 22-2 and 24-2 parallel to the Y-axis direction. When viewed from the Z-axis direction, the tip portions 41-2, 42-2, 43-2, and 44-2 of the resonator 20-2 are arranged so that they do not overlap with the glass fiber 31. 【0036】 (Second example) The positional relationship between the resonator and the glass fiber in the second example of the third embodiment will be explained using Figure 6. Figure 6 is a diagram illustrating the positional relationship between the resonator and the glass fiber in the second example of the third embodiment. 【0037】 In the example shown in Figure 6, for the sake of simplicity, only glass fibers 31 parallel to the Y-axis are shown. 【0038】 The resonator 20-1 is positioned rotated 90° in the XY plane from the state of the resonator 20-1 shown in Figure 5. When viewed from the Z-axis direction, the tip 41-1, tip 42-1, tip 43-1, and tip 44-1 of the resonator 20-1 are positioned to overlap with the glass fiber 31. 【0039】 The resonator 20-2 is positioned rotated 90° in the XY plane from the state of the resonator 20-2 shown in Figure 5. When viewed from the Z-axis direction, the tip portions 41-2, 42-2, 43-2, and 44-2 of the resonator 20-2 are positioned so as not to overlap with the glass fiber 31. 【0040】 (Third example) The positional relationship between the resonator and the glass fiber in the third example of the third embodiment will be explained using Figure 7. Figure 7 is a diagram illustrating the positional relationship between the resonator and the glass fiber in the third example of the third embodiment. 【0041】 In the example shown in Figure 7, for the sake of simplicity, only glass fibers 31 parallel to the Y-axis are shown. 【0042】 The resonator 20-1 is positioned such that its ends 21-1 and 23-1 are tilted diagonally downward to the right compared to the state of the resonator 20-1 shown in Figure 5. When viewed from the Z-axis direction, the tip 41-1, tip 42-1, tip 43-1, and tip 44-1 of the resonator 20-1 are positioned so that they overlap with the glass fiber 31. 【0043】 The resonator 20-2 is positioned such that its ends 21-2 and 23-2 are tilted diagonally downward to the right compared to the state of the resonator 20-2 shown in Figure 5. When viewed from the Z-axis direction, the tip 41-2, tip 42-2, tip 43-2, and tip 44-2 of the resonator 20-2 are positioned so that they do not overlap with the glass fiber 31. 【0044】 In the third embodiment, the amount of phase change can be appropriately differentiated between unit structures 10 in which the tip of the resonator 20 overlaps with the glass fiber 31 when viewed from the Z-axis direction, and unit structures in which the tip of the resonator 20 does not overlap with the glass fiber 31. As a result, in the third embodiment, the amount of phase change can be more appropriately varied for each unit structure 10, and the beam width can be made wider appropriately. 【0045】 [Fourth Embodiment] Next, a fourth embodiment will be described. Typically, the dielectric layer of the substrate 2 includes a core layer and a prepreg layer. The glass fiber layer 30 is included in the core layer and the prepreg layer of the substrate 2. The reflective or transmitted properties of the unit structure 10 change depending on the ratio of glass fibers 31 to resin included in the core layer and prepreg layer of the substrate 2. Therefore, in the fourth embodiment, the properties of the unit structure 10 can be adjusted to desired properties by adjusting the ratio of glass fibers 31 included in the core layer and the prepreg layer. 【0046】 The content of the glass fiber layer 30 in the core layer of the dielectric layer of substrate 2 is preferably 60 wt% or less of the total content of the core layer. Furthermore, the content of the dielectric material (resin) in the core layer of the dielectric layer of substrate 2 is preferably 50 wt% or less of the total content of the core layer. 【0047】 The content of the glass fiber layer 30 in the prepreg layer of the dielectric layer of substrate 2 is preferably 50 wt% or less of the total prepreg layer. Furthermore, the content of the dielectric material in the prepreg layer of the dielectric layer of substrate 2 is preferably 50 wt% or more of the total prepreg layer. 【0048】 In the fourth embodiment, a radio wave control plate having desired reflection and transmission characteristics can be realized by adjusting the content of the glass fiber layer in the core layer and prepreg layer of the dielectric layer. 【0049】 Furthermore, in the fourth embodiment, if a radio wave control board having the desired reflection and transmission characteristics can be realized, a general-purpose substrate can be used for the radio wave control board, making it easy to construct a radio wave control board with the desired characteristics. 【0050】 While embodiments of the present disclosure have been described above, the present disclosure is not limited by the content of these embodiments. Furthermore, the aforementioned components include those that are readily conceivable to those skilled in the art, those that are substantially identical, and those that fall within the so-called equivalent range. Moreover, the aforementioned components can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the components can be made without departing from the spirit of the embodiments described above. [Explanation of symbols] 【0051】 1. Radio wave control panel 2 circuit boards 10 Unit Structure 20 resonator 21-1, 22-1, 23-1, 24-1, 21-2, 22-2, 23-2, 24-2 End 30 Glass fiber layer 31 Glass fiber 41-1,42-1,43-1,44-1,41-2,42-2,43-2,44-2 Tip

Claims

[Claim 1] It includes multiple unit structures arranged in the first plane direction, The aforementioned unit structure is Dielectric layer and The dielectric layer comprises a resonator disposed on the dielectric layer and extending in the first plane direction, The dielectric layer is formed of glass fibers and includes a glass fiber layer extending in the first plane direction. The glass fiber layer includes a plurality of glass fibers arranged parallel to the first and second directions within the first planar direction, When viewed from the first direction and a third direction perpendicular to the second direction, the number of glass fibers overlapping the end of the resonator differs for each unit structure. Radio wave control panel. [Claim 2] Among the multiple unit structures, When viewed from the third direction, the number of glass fibers overlapping with the end of the resonator of one unit structure is different from the number of glass fibers overlapping with the end of the resonator of the other unit structure. The radio wave control board according to claim 1. [Claim 3] Among the multiple unit structures, Viewed from the third direction, the tip of the resonator of one of the unit structures overlaps with the glass fibers, and the tip of the resonator of the other unit structure does not overlap with the glass fibers. The radio wave control board according to claim 1. [Claim 4] The proportion of the glass fiber layer included in the core layer of the dielectric layer is 60 wt% or less of the total core layer. The radio wave control board according to claim 1. [Claim 5] The proportion of the glass fiber layer included in the prepreg layer of the dielectric layer is 50 wt% or less of the total prepreg layer. The radio wave control board according to claim 1.

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