Electromagnetic wave absorbing member

Abstract

An electromagnetic wave absorbing member includes a resistive layer having a conductor pattern, the resistive layer having a first region and a second region that differ from each other in electromagnetic wave transmission characteristics, the first region having a conductor pattern having a plurality of first arrays in which a plurality of first cells are arranged, and a plurality of second arrays in which a plurality of second cells are arranged, and a second region having a conductor pattern having a plurality of first arrays in which the first cells and the second cells are arranged in the first direction, and a plurality of second arrays in which the first cells and the second cells are arranged in the second direction, the conductor pattern having a plurality of first arrays in which the first cells and the second cells are arranged in the first direction, and a plurality of second arrays in which the first cells and the second cells are arranged in the second direction. A plurality of the first cells and the second cells are disposed in a second direction different from the first direction, and the first array and the second array are disposed adjacent to each other in the first region and the second region.

Description

Technical Field

[0001] This invention relates to electromagnetic wave absorbing components. Background Technology

[0002] A sheet-like electromagnetic wave absorbing member is known to selectively absorb electromagnetic waves of a specified frequency. In such an electromagnetic wave absorbing member, electromagnetic waves of a specified frequency can be shielded by a fine line pattern of an FSS (Frequency Selective Surface) element formed of a conductor (Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent No. 6861907 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] Here, the impedance of the FSS element varies depending on the direction of the polarization of the incident electromagnetic wave, and sometimes the absorption characteristics of the electromagnetic wave decrease. Therefore, when used as an electromagnetic wave absorbing component, if the direction of the polarization of the electromagnetic wave incident on the electromagnetic wave absorbing component is different from the direction of high absorption characteristics of the electromagnetic wave, the absorption characteristics of the electromagnetic wave may sometimes decrease.

[0008] The present invention was made in view of the above-mentioned problems, and its object is to provide an electromagnetic wave absorbing component that has stable performance regardless of the direction of the polarization wave of the incident electromagnetic wave.

[0009] Solution for solving the problem

[0010] To solve the above problems, the electromagnetic wave absorbing component of the present invention has the following solution.

[0011] [1]

[0012] An electromagnetic wave absorbing component, characterized in that it includes a resistive layer having a conductive pattern.

[0013] The resistive layer has a first region and a second region with different electromagnetic wave transmission characteristics.

[0014] The first region has the following conductive pattern:

[0015] It has multiple first arrangements, and each first arrangement is configured with multiple first units.

[0016] It has multiple second arrangements, each of which is configured with multiple second units different from the first unit.

[0017] The second region has the following conductive pattern:

[0018] Having multiple of the first arrangement,

[0019] Having multiple second arrangements,

[0020] In the first region, multiple first and second units are arranged along a first direction.

[0021] In the second region, multiple first and second units are arranged along a second direction different from the first direction.

[0022] In the first region and the second region, the first arrangement and the second arrangement are arranged adjacent to each other.

[0023] [2]

[0024] According to the electromagnetic wave absorbing component described in [1], wherein,

[0025] The first region has multiple third arrangements, each third arrangement having multiple third units that are different from both the first unit and the second unit.

[0026] The second region has multiple of the third arrangements.

[0027] In the first region, the third unit is configured along the first direction.

[0028] In the second region, the third unit is configured along the second direction.

[0029] [3]

[0030] According to the electromagnetic wave absorbing component described in [1] or [2], wherein,

[0031] The conductive pattern in the second region is a pattern formed by rotating and reversing at least one of the conductive patterns in the first region.

[0032] [4]

[0033] The electromagnetic wave absorbing component according to any one of [1] to [3], wherein,

[0034] The first region and the second region are repeatedly configured with a certain interval between them.

[0035] [5]

[0036] The electromagnetic wave absorbing component according to any one of [1] to [4], wherein,

[0037] The resistive layer also has a third region and a fourth region with different electromagnetic wave transmission characteristics.

[0038] The third region has the following conductive pattern:

[0039] It has an arrangement of multiple fourth units configured along the first direction.

[0040] It has an arrangement of multiple fifth units, different from the fourth unit, along the first direction.

[0041] The fourth region has the following conductive pattern:

[0042] It has an arrangement of multiple fourth units configured along the second direction.

[0043] It has an arrangement of multiple fifth units configured along the second direction.

[0044] The first region and the third region differ in at least one of the following: the spacing of the conductive patterns, the shape of the units included in the arrangement, the size of the units, and the spacing of the units.

[0045] The second region and the fourth region differ in at least one of the following: the spacing of the conductive patterns, the shape of the units included in the arrangement, the size of the units, and the spacing of the units.

[0046] [6]

[0047] According to the electromagnetic wave absorbing component described in [5], wherein,

[0048] The third region has an arrangement of multiple sixth units, each different from the fourth and fifth units, along the first direction.

[0049] The fourth region has multiple arrangements of the sixth units configured along the second direction.

[0050] [7]

[0051] According to the electromagnetic wave absorbing component described in [5] or [6], wherein,

[0052] The third region and the fourth region are repeatedly configured at certain intervals.

[0053] [8]

[0054] The electromagnetic wave absorbing component according to any one of [5] to [7], wherein,

[0055] The conductive pattern in the fourth region is a pattern formed by rotating and reversing at least one of the conductive patterns in the third region.

[0056] [9]

[0057] The electromagnetic wave absorbing component according to any one of [5] to [8], wherein,

[0058] The first region is configured such that it is adjacent to at least one of the third and fourth regions and not adjacent to the second region.

[0059]

[10]

[0060] The electromagnetic wave absorbing component according to any one of [5] to [8], wherein,

[0061] The first region is configured to be adjacent to at least one of the second region and the fourth region, but not adjacent to the third region.

[0062]

[11]

[0063] The electromagnetic wave absorbing component according to any one of [1] to

[10] , wherein,

[0064] The electromagnetic wave absorbing component has a fifth region, which has the following conductive pattern: having multiple first arrangements and multiple second arrangements.

[0065] In the fifth region,

[0066] Multiple first and second units are configured along a third direction different from both the first and second directions.

[0067] The first arrangement and the second arrangement are arranged adjacent to each other.

[0068]

[12]

[0069] The electromagnetic wave absorbing component according to any one of [1] to

[11] , wherein,

[0070] The electromagnetic wave absorbing component also has a spacer layer and a reflective layer.

[0071] Invention Effects

[0072] According to the present invention, an electromagnetic wave absorbing component with stable performance regardless of the direction of the polarization wave of the incident electromagnetic wave can be provided. Attached Figure Description

[0073] Figure 1 This is a cross-sectional view of the electromagnetic wave absorbing component of this embodiment.

[0074] Figure 2 This is a top view showing an example of the conductive pattern of the electromagnetic wave absorbing member of this embodiment.

[0075] Figure 3This is a top view showing the conductive pattern of the electromagnetic wave absorbing component of the comparison object.

[0076] Figure 4 Figure 4A is a graph showing the electromagnetic wave absorption characteristics of the electromagnetic wave absorbing component of the comparison object. Figure 4 Figure 4B is a diagram showing the electromagnetic wave absorption characteristics of the electromagnetic wave absorbing member of the first embodiment.

[0077] Figure 5 5A is a top view showing a first modified example of the conductive pattern of the electromagnetic wave absorbing member according to the first embodiment. Figure 5 5B is a top view showing a second variation of the conductive pattern of the electromagnetic wave absorbing member of the first embodiment.

[0078] Figure 6 6A is a top view showing an example of the conductive pattern of the electromagnetic wave absorbing member according to the second embodiment. Figure 6 6B is a top view showing a reference example of the conductive pattern of an electromagnetic wave absorbing component.

[0079] Figure 7 Figure 7A is a graph showing the electromagnetic wave absorption characteristics of the electromagnetic wave absorbing component of the reference example. Figure 7 Figure 7B is a diagram showing the electromagnetic wave absorption characteristics of the electromagnetic wave absorbing member according to the second embodiment.

[0080] Figure 8 Figure 8A is a top view showing a modified example of a region of the conductive pattern of an electromagnetic wave absorbing component. Figure 8 8B is a top view showing a modified example of a region of the conductive pattern of an electromagnetic wave absorbing component.

[0081] Figure 9 9A is a top view showing a first modified example of the conductive pattern of the electromagnetic wave absorbing member according to the second embodiment. Figure 9 9B is a top view showing a second variation of the conductive pattern of the electromagnetic wave absorbing member according to the second embodiment. Detailed Implementation

[0082] The embodiments will now be described in detail with reference to the accompanying drawings. It should be noted that the following embodiments do not limit the invention as described in the claims. While multiple features are described in the embodiments, not all of these features are essential to the invention; furthermore, multiple features can be arbitrarily combined. Moreover, in the accompanying drawings, the same or identical components are labeled with the same reference numerals, and repeated descriptions are omitted.

[0083] In this specification, a "conductor pattern" is an assembly of geometric units, referring to an object that allows electromagnetic waves of a certain frequency to selectively pass through. It can also be said that a "conductor pattern" functions similarly to an antenna. In this specification, "electromagnetic waves in the millimeter-wave region" refers to electromagnetic waves with wavelengths from 1 mm to 10 mm. Alternatively, "electromagnetic waves in the millimeter-wave region" can be said to be electromagnetic waves with frequencies from 30 GHz to 300 GHz. In this specification, the "~" indicating a numerical range means that the values ​​before and after it are included as the lower and upper limits.

[0084] <First Implementation Method>

[0085] [Electromagnetic wave absorbing component]

[0086] Figure 1 The electromagnetic wave absorbing member of this embodiment is schematically shown in a cross-sectional view along the thickness plane. Figure 2 This is a top view schematically illustrating an example of the conductive pattern of the electromagnetic wave absorbing member of this embodiment. (See attached image.) Figure 1 As shown, the electromagnetic wave absorbing member 1 of this embodiment has a resistive layer 10, a spacer layer 20, and a reflective layer 30. Furthermore, the resistive layer 10, the spacer layer 20, and the reflective layer 30 are stacked sequentially.

[0087] The reflective layer 30 is disposed on the other side (back side) 10b of the resistive layer 10. The spacer layer 20 is disposed between the resistive layer 10 and the reflective layer 30. That is, the resistive layer 10 and the reflective layer 30 are stacked with the spacer layer 20 in between.

[0088] Resistor layer 10 can be a single layer, or it can be like... Figure 1 As shown, it includes a substrate 11 and a conductive pattern 12 formed on the substrate 11. When the resistive layer 10 is a single layer, the resistive layer 10 is made of the same material as the conductive pattern 12 described later.

[0089] (Resistive layer)

[0090] The resistive layer 10 is composed of a frequency selective surface (FSS). A frequency selective surface is a surface that can block or allow electromagnetic waves of a specific frequency to pass through by means of a continuous structure formed by conductive components or the like in a shape below the wavelength.

[0091] A conductive pattern 12, described later, is formed on the resistive layer 10. The conductive pattern 12 is formed by depositing, for example, fine metal wires, conductive films, or a fixing agent of conductive paste on the substrate 11. Examples of metal materials include copper, aluminum, tungsten, iron, molybdenum, nickel, titanium, silver, gold, or alloys containing two or more of these metals (e.g., stainless steel, carbon steel, brass, phosphor bronze, zirconium copper alloy, beryllium copper, iron-nickel, nickel-chromium alloy, nickel-titanium, Kanthal, Hastelloy, rhenium-tungsten, etc.).

[0092] Materials used for conductive thin films include metal particles, carbon nanoparticles, and carbon fibers. It should be noted that, in order to adjust the transmittance characteristics of the resistive layer 10, the conductive pattern 12 can also be formed using multiple materials.

[0093] The substrate 11 is a flat plate with a thickness of, for example, 5 μm to 500 μm, 15 μm to 200 μm, or 25 μm to 100 μm. The material of the substrate 11 can be appropriately selected depending on the application of the electromagnetic wave absorbing member 1. For example, if the electromagnetic wave absorbing member 1 is intended to be transparent, the substrate 11 can be made of a transparent material. Alternatively, if the electromagnetic wave absorbing member 1 is intended to be able to follow curved surfaces, the substrate 11 can be made of a flexible material. To improve the transparency and three-dimensional formability of the electromagnetic wave absorbing member 1, the surface of the substrate 11 can be made smooth.

[0094] For example, the substrate 11 can be made of resin. The resin can be a thermoplastic resin or a thermosetting resin. However, considering the three-dimensional moldability of the electromagnetic wave absorbing member 1, the substrate 11 preferably contains a thermoplastic resin. Examples of thermoplastic resins include polyolefin resins, polyester resins, polyester-polyether resins, polyacrylic resins, polystyrene resins, polyimide resins, polyimide amide resins, polyamide resins, polyurethane resins, polycarbonate resins, polyarylate resins, melamine resins, epoxy resins, urethane resins, silicone resins, and fluororesins. Specific examples of polyolefin resins include polypropylene and polyethylene. Specific examples of polyester resins include polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate.

[0095] The substrate 11 may contain any components without impairing the effects of this embodiment. Examples of such components include inorganic fillers, colorants, curing agents, anti-aging agents, light stabilizers, flame retardants, conductive agents, antistatic agents, plasticizers, etc.

[0096] To further improve the electromagnetic wave absorption performance of the electromagnetic wave absorbing component 1, the thickness, dielectric constant, conductivity, and permeability of the substrate 11 can be appropriately set. Considering the electrical characteristics of the electromagnetic wave to be absorbed, the substrate 11 can also be a layer with a high dielectric constant. If the substrate 11 is a layer with a high dielectric constant, the thickness of the electromagnetic wave absorbing component 1 can be relatively reduced.

[0097] The resistive layer 10 can be fabricated, for example, by the following method. First, a substrate 11 is prepared. Next, a conductive pattern, as described later, is formed on one side 11a of the substrate 11. When forming each conductive pattern, each conductive pattern is formed in such a way that the frequency at which the transmission of electromagnetic waves transmitted through each conductive pattern reaches a maximum value is a predetermined value [GHz]. The order in which each conductive pattern is formed is not particularly limited. Each conductive pattern can be formed in the same process or in different processes.

[0098] The method for forming each conductive pattern is not particularly limited as long as it is a scheme that can absorb a specified frequency in the structure of the electromagnetic wave absorbing component. Examples of methods for forming each conductive pattern are as follows: (1) A printing method in which each conductive pattern is printed on one side 11a of the substrate 11 using a conductive paste; (2) A developing method in which each conductive pattern is developed on one side 11a of the substrate 11; (3) A method in which a metal thin film is placed on one side 11a of the substrate 11 by sputtering, vacuum evaporation or lamination of metal foil and a pattern of the metal thin film is formed on one side 11a of the substrate 11 by photolithography; (4) A method in which metal lines are arranged on one side 11a of the substrate 11.

[0099] (Spare layer)

[0100] A spacer layer 20 is disposed on the opposite surface 10b of the resistive layer 10. The spacer layer 20 has two surfaces 20a and 20b. One surface 20a of the spacer layer 20 is opposite to the opposite surface 10b of the resistive layer 10. A reflective layer 30 is disposed on the opposite surface 20b of the spacer layer 20. The spacer layer 20 can be a single-layer structure or a multi-layer structure.

[0101] The material of the spacer layer 20 can be appropriately selected depending on the application, and examples include plastic film, paper, cloth, non-woven fabric, rubber sheet, foam sheet, etc. Among these, foam sheet is preferred from the viewpoint of easily increasing thickness and achieving lightweight. As a foam sheet, for example, a sheet-like foam sheet can be formed by foaming the resin constituting the plastic film. Specific examples of foam sheets include polyethylene foam, polypropylene foam, polyurethane foam, etc.

[0102] Taking into account the wavelength shortening effect obtained by the spacer layer 20, the thickness of the spacer layer 20 is appropriately varied according to the wavelength of the electromagnetic wave to be absorbed and the relative permittivity of the spacer layer 20. Taking into account the wavelength shortening effect obtained by the spacer layer 20, the thickness of the spacer layer 20 preferably satisfies the following equation (1).

[0103] (Thickness of spacer layer 20 in the z-axis direction) = (λ) × (1 / 4) / (ε) 1 / 2 Equation (1)

[0104] Where λ is the wavelength of the incoming electromagnetic wave, and ε is the relative permittivity of the spacer layer 20. The thickness of the spacer layer 20 can be appropriately adjusted to adjust the absorption characteristics of the electromagnetic wave absorbing member 1. For example, it can be varied within the range of 0.1 to 3.0 times the thickness of the spacer layer 20 obtained from the above formula (1).

[0105] When the relationship between the thickness of the spacer layer 20 and the wavelength λ satisfies the above equation (1), the electromagnetic wave absorbing member 1 becomes a so-called λ / 4 structure. In this case, the electromagnetic wave passing through the spacer layer 20 and reflected by the reflective layer 30 has a phase reversal with the electromagnetic wave reflected by the resistive layer 10, that is, the phase difference becomes 180 degrees. As a result, the electric current of the electromagnetic wave reflected from the electromagnetic wave absorbing member 1 can be reduced. The thickness of the spacer layer 20 can be appropriately set according to the wavelength λ of the electromagnetic wave that is the target of absorption by the electromagnetic wave absorbing member 1. The thickness of the spacer layer 20 can be, for example, 25μm to 5000μm, 300μm to 4000μm, or 1000μm to 3000μm. The spacer layer 20 can be made of a material with a high dielectric constant. If the spacer layer 20 is a layer with a high dielectric constant, the thickness of the spacer layer 20 can be relatively thinned. Taking into account the dielectric constant of spacer layer 20, spacer layer 20 may contain at least one of the following: barium titanate, titanium oxide, and strontium titanate.

[0106] (Reflective layer)

[0107] The reflective layer 30 has two surfaces 30a and 30b. One surface 30a of the reflective layer 30 faces the other surface 20b of the spacer layer 20. The reflective layer 30 is not particularly limited as long as it can reflect electromagnetic waves that fly towards and pass through the electromagnetic wave absorbing member 1. A portion of the electromagnetic waves that fly towards the electromagnetic wave absorbing member 1 are reflected or absorbed by the resistive layer 10. On the other hand, electromagnetic waves that are neither reflected nor absorbed by the resistive layer 10 pass through the resistive layer 10. The electromagnetic waves that pass through the resistive layer 10 are reflected by the reflective layer 30 towards the resistive layer 10.

[0108] For example, any scheme in which the reflective layer 30 is conductive in either of the two surfaces 30a and 30b can reflect electromagnetic waves that pass through the resistive layer 10. Specifically, a layer formed by bonding metal foils such as aluminum foil or copper foil, or metal plates such as copper plates, to a resin film such as polyethylene terephthalate can be used as the reflective layer 30. Alternatively, a mesh formed from a transparent conductive film such as ITO, or metal wires, can be used instead of metal foils or metal plates.

[0109] When the spacer layer 20 is formed on a conductive material such as a metal, the conductive material such as the metal functions as the reflective layer 30, so the reflective layer 30 can be omitted.

[0110] For the purpose of applying the electromagnetic wave absorbing member 1 to the surface of various articles, an adhesive layer can be provided on the surface 30b opposite to the reflective layer 30. When an adhesive layer is provided on the surface 30b opposite to the reflective layer 30, a release film can be provided on the surface opposite to the side of the adhesive layer that is in contact with surface 30b. The release film is removed when the electromagnetic wave absorbing member 1 is used. By covering the adhesive surface with the release film, the operability during circulation is improved.

[0111] Examples of adhesives constituting the adhesive layer include heat-sealing adhesives that bond by heat; adhesives that exhibit stickiness when wetted; and pressure-sensitive adhesives that bond by pressure. From a simplicity perspective, pressure-sensitive adhesives can be chosen. Specific examples of adhesives include acrylic adhesives, urethane adhesives, rubber adhesives, polyester adhesives, silicone adhesives, and polyvinyl ether adhesives. At least one adhesive selected from the group consisting of acrylic adhesives, urethane adhesives, and rubber adhesives can be used.

[0112] Furthermore, the electromagnetic wave absorbing member 1 of this embodiment may have a protective layer formed on one side (surface) 10a of the resistive layer 10. The protective layer is not particularly limited as long as it can protect the resistive layer 10.

[0113] [Conductor pattern]

[0114] Next, refer to Figure 2 The details of the conductive pattern 12 are explained below. Figure 2 This is a schematic top view showing the resistive layer 10. The conductive pattern 12 includes a first region 200 and a second region 210. (As shown...) Figure 2As shown, the first region 200 and the second region 210 are repeatedly arranged at certain intervals in the X and Y directions to form a conductive pattern 12. It should be noted that the intervals in the X and Y directions can be the same or different. It should also be noted that regions 200 and 210 are described as quadrilaterals, but this is not a limitation; regions 200 and 210 can have any shape, such as triangles or hexagons.

[0115] It should be noted that the electromagnetic wave transmission characteristic represents the proportion (electromagnetic wave transmittance) of the electromagnetic wave intensity that passes through surface 10b when an electromagnetic wave of a specified intensity is incident on surface 10a of the resistive layer 10. In one example, the electromagnetic wave transmission characteristic establishes a correspondence between the frequency of the electromagnetic wave and the electromagnetic wave transmittance for multiple different frequencies. Furthermore, in one example, the electromagnetic wave transmission characteristic establishes a correspondence between the polarization direction of the incident electromagnetic wave and the frequency of the electromagnetic wave and the electromagnetic wave transmittance. The electromagnetic wave transmission characteristic can be defined for the resistive layer 10 as a whole, or it can be defined separately for the first region 200 and the second region 210. In addition, the electromagnetic wave transmission characteristic can also be defined for each of the first unit u1 to the third unit u3 of the conductive pattern 12 described below, and for each of the first arrangement 202 to the third arrangement 204 in which multiple units are arranged.

[0116] The first region 200 includes a first arrangement 202 with multiple first units u1, a second arrangement 203 with multiple second units u2, and a third arrangement 204 with multiple third units u3. For example... Figure 2 As shown, the first region 200 includes multiple first to third arrangements 202 to 204.

[0117] Furthermore, in the first region 200, the first to third arrangements 202 to 204, extending along the first direction (hereinafter, sometimes referred to as direction 201) indicated by arrow 201, that is, the "units" of the geometric figures included in the arrangement, are repeatedly arranged at predetermined intervals along the first direction.

[0118] The second region 210 includes a first arrangement 212 with multiple first units u1, a second arrangement 213 with multiple second units u2, and a third arrangement 214 with multiple third units u3.

[0119] Furthermore, in the second region 210, the first to third rows 212 to 214 extend along the second direction (hereinafter, sometimes referred to as direction 211) indicated by arrow 211, that is, the units in the second region 210 are repeatedly arranged at predetermined intervals along the second direction 211.

[0120] It should be noted that the spacing between units within an arrangement is not particularly limited. Furthermore, the spacing between units can be regular or irregular. Furthermore, the spacing between multiple arrangements is not particularly limited. Furthermore, the spacing between multiple arrangements can be regular or irregular. In this embodiment, the spacing between units is the same in the first region 200 and the second region 210. Therefore, after determining the arrangement spacing of units u1 to u3 in the first to third arrangements 202 to 204 arranged in the first region 200, the arrangement of the conductors in the second region 210 can be determined by rotating the first region 200 in the XY plane. In another example, after determining the arrangement of units in the first region 200, the arrangement of the conductors in the second region 210 can also be determined by rotating the first region 200 in the XY plane. Figure 2 The arrangement of elements in the second region 210 is determined by reversing the specified directions on the XY plane. In this way, after determining the arrangement of elements in the first region 200, the arrangement of elements in the second region 210 is determined by rotating and reversing the arrangement of elements in the first region 200, thereby simplifying the design of the arrangement of elements in the second region 210.

[0121] However, the configuration patterns of the cells can also be designed separately for the first region 200 and the second region 210. Furthermore, sometimes near the boundary between the first region 200 and the second region 210, the impedance changes due to the coupling between the cells. Therefore, the spacing between cells adjacent to the boundary between the first region 200 and the second region 210 can be adjusted from... Figure 2 Changes to d1 to d3.

[0122] (First row)

[0123] As described above, the first arrangement 202, 212 is composed of multiple first units u1. Each of the first units u1 is a geometric figure.

[0124] That is, the first arrangement 202, 212 can also be described as an assembly of the first unit u1 as a geometric figure. Each of the first unit u1 functions as an antenna. The first arrangement 202, 212 can, for example, be a thin line pattern of FSS elements.

[0125] like Figure 2 As shown, the first unit u1 has a cross-shaped structure that is symmetrical from top to bottom and left to right. Specifically, the first unit u1 has a cross portion S1 and four ends T1. The cross portion S1 includes two orthogonal straight sections, which are arranged at 45 degrees and -45 degrees relative to the direction of the arrangement unit u1. Each of the two straight sections included in the cross portion S1 is connected to a straight end T1 at each end in a manner orthogonal to the respective straight section.

[0126] By adjusting the length and width of the straight section of the cross section S1 of the first unit u1, and the length and width of each of the four ends T1, the transmission characteristics of the electromagnetic waves obtained by the first unit u1, which functions as an antenna, can be adjusted.

[0127] However, the shape of the first unit u1 is not limited to a cross shape. The shape of the first unit u1 is not particularly limited as long as the value of the frequency at which the transmission of electromagnetic waves transmitted through the first arrangement 202, 212 reaches a maximum value is A [GHz]. For example, the shapes of the first unit u1 can be circular, annular, linear, square, polygonal, H-shaped, Y-shaped, V-shaped, etc.

[0128] In this embodiment, it has been described that the shapes of the plurality of first units u1 included in an arrangement are identical. However, the shape of any one of the plurality of first units u1 may not be identical. In other examples, the shapes of the plurality of first units u1 may be identical or different, as long as they can adjust the transmission characteristics to the target frequency.

[0129] The first arrangement 202, 212 selectively transmits electromagnetic waves with a frequency of A [GHz]. The frequency value A [GHz] is the value of the frequency at which the transmission of electromagnetic waves transmitted by the first arrangement 202, 212 reaches its maximum value in the range of 20 GHz to 110 GHz.

[0130] The first arrangement 202, 212 allows electromagnetic waves of a specific frequency A [GHz] obtained by the above method X to pass through.

[0131] In the resistive layer 10 of this embodiment, the frequency value A is, for example, 20GHz to 110GHz, preferably 60GHz to 100GHz, more preferably 65GHz to 95GHz, and for example, 70GHz to 90GHz. If the frequency value A is within the above-mentioned range, the resistive layer 10 can allow electromagnetic waves in the millimeter-wave region to pass through, and can be easily applied to automotive parts, roadside parts, building exterior materials, windows, communication equipment, radio telescopes, etc.

[0132] The spacing between the ends of the pattern that forms the first unit u1 is not particularly limited, as long as the transmission characteristics can be adjusted to the target frequency. For example, the spacing between the ends of the pattern that forms the first unit u1 can be all the same or different. However, from the perspective of making it easier to design a resistive layer 10 that is not easily affected by the surrounding environment and improving the accuracy of the frequency band of electromagnetic waves transmitted during manufacturing, it is preferable that the spacing between the ends of the pattern that forms the first unit u1 is the same.

[0133] (Second arrangement)

[0134] like Figure 2 As shown, the second arrangement 203, 213 is composed of multiple second units u2. The second unit u2, like the first unit u1, is a cross-shaped structure symmetrical in all directions. Specifically, the second unit u2 has a cross-shaped portion S2 and four ends T2, the dimensions of which are different from those of the first unit u1.

[0135] The dimensions of S2 and T2 in the second arrangement 203, 213 are designed to selectively transmit electromagnetic waves with a frequency of B[GHz] satisfying the following equation (2). The frequency value B[GHz] is the value of the frequency at which the transmission of electromagnetic waves transmitted through the second arrangement 203, 213 reaches its maximum value. The frequency value B[GHz] satisfies the following equation (2).

[0136] 1.037×A≤B≤1.30×A Equation (2)

[0137] As shown in equation (2) above, the second arrangement 203, 213 allows electromagnetic waves with frequencies of 1.037×A [GHz] to 1.30×A [GHz] to pass through. Preferably, the second arrangement 203, 213 allows electromagnetic waves with frequencies of 1.17×A [GHz] to 1.25×A [GHz] to pass through.

[0138] The second arrangement 203, 213 allows electromagnetic waves with frequencies above 1.037 × Å [GHz] to pass through. Therefore, in a frequency band higher than Å [GHz], the peak of the transmission of electromagnetic waves based on the second arrangement 203, 213 fully overlaps with the peak of the transmission of electromagnetic waves based on the first arrangement 202, 212. As a result, compared to an electromagnetic wave absorbing member having only the first arrangement 202, 212, the frequency band of electromagnetic waves that can be absorbed by the electromagnetic wave absorbing member as a whole is extended to the frequency side higher than Å [GHz]. That is, the frequency band of electromagnetic waves that can be absorbed by the electromagnetic wave absorbing member as a whole can be broadbanded towards the higher frequency side.

[0139] The second arrangement 203, 213 allows electromagnetic waves with frequencies below 1.30 × Å [GHz] to pass through. Therefore, in the frequency band higher than Å [GHz], the frequency difference between the peak of the transmission of electromagnetic waves based on the second arrangement 203, 213 and the peak of the transmission of electromagnetic waves based on the first arrangement 202, 212 becomes smaller. As a result, a single peak is formed where the absorption of electromagnetic waves absorbed by the electromagnetic wave absorbing member 1 as a whole becomes a maximum. Based on the above, the second arrangement 203, 213 allows electromagnetic waves with frequencies from 1.037 × Å [GHz] to 1.30 × Å [GHz] to pass through, thus the absorption of electromagnetic waves absorbed by the electromagnetic wave absorbing member as a whole expands into the higher frequency band.

[0140] The material of the second unit u2 constituting the second arrangement 203, 213 can be any material that allows electromagnetic waves of B[GHz] to pass through. There are no special restrictions. As long as the transmission characteristics can be adjusted to the target frequency, there are no special restrictions.

[0141] (Third arrangement)

[0142] like Figure 2 As shown, the third arrangement 204 and 214 are composed of multiple third units u3.

[0143] The third unit u3, like the first unit u1, is a cross-shaped structure that is symmetrical from top to bottom and left to right. Specifically, the third unit u3 has a cross-shaped portion S3 and four ends T3, and the dimensions of either S3 or T3 are different from those of the first unit u1 and the second unit u2.

[0144] The dimensions of S3 and T3 in the third arrangement 204, 214 are designed to selectively transmit electromagnetic waves with a frequency of C[GHz] satisfying the following equation (3). The frequency value C[GHz] is the value of the frequency at which the transmission of electromagnetic waves transmitted through the third arrangement 204, 214 reaches its maximum value. The frequency value C[GHz] satisfies the following equation (3).

[0145] 0.60×A≤C≤0.963×A Equation (3)

[0146] As shown in equation (3) above, the third arrangement 204, 214 allows electromagnetic waves with frequencies of 0.60×A[GHz] to 0.963×A[GHz] to pass through. Preferably, the third arrangement 204, 214 allows electromagnetic waves with frequencies of 0.60×A[GHz] to 0.83×A[GHz] to pass through.

[0147] The third arrangement 204, 214 allows electromagnetic waves with frequencies above 0.60 × Å [GHz] to pass through. Therefore, in frequency bands lower than Å [GHz], the frequency difference between the peak of electromagnetic wave transmission based on the third arrangement 204, 214 and the peak of electromagnetic wave transmission based on the first arrangement 202, 212 becomes smaller. As a result, the transmission of electromagnetic waves formed throughout the resistive layer 10 becomes a single peak with a maximum value.

[0148] The third arrangement 204, 214 allows electromagnetic waves with frequencies below 0.963 × Å [GHz] to pass through. Therefore, in the frequency band lower than Å [GHz], the peak of the transmission of electromagnetic waves based on the third arrangement 204, 214 fully overlaps with the peak of the transmission of electromagnetic waves based on the first arrangement 202, 212. As a result, compared to a film having only the first arrangement 202, 212, the frequency band of electromagnetic waves that can be absorbed by the electromagnetic wave absorbing member is extended to the frequency side lower than Å [GHz]. That is, the frequency band of electromagnetic waves that can be absorbed by the electromagnetic wave absorbing member as a whole can be broadbanded towards the lower frequency side.

[0149] Based on the above, the third arrangement 204 and 214 allow electromagnetic waves with frequencies of 0.60×A [GHz] to 0.963×A [GHz] to pass through. Therefore, the amount of electromagnetic waves transmitted through the resistive layer 10 as a whole expands the frequency band to the lower frequency side.

[0150] The material of the third unit u3 that constitutes the third arrangement 204 and 214 can be any material that allows electromagnetic waves of C[GHz] to pass through. There are no special restrictions. As long as the transmission characteristics can be adjusted to the target frequency, there are no special restrictions.

[0151] exist Figure 2 In the resistive layer 10, the first region 200 and the second region 210 are arranged in a manner where the first arrangement 202, 212, the second arrangement 203, 213, and the third arrangement 204, 214 are adjacent to each other. Because the first arrangement 202, 212, the second arrangement 203, 213, and the third arrangement 204, 214 are arranged adjacent to each other on the substrate 11, the frequency bands of the electromagnetic waves selectively transmitted by the second arrangement 203, 213 and the third arrangement 204, 214 overlap, with reference to the frequency value A [GHz] of the peak position of the electromagnetic waves selectively transmitted by the first arrangement 202, 212. As a result, the transmission area of ​​the electromagnetic waves transmitted throughout the resistive layer 10 easily extends towards both the high-frequency and low-frequency sides, with reference to the frequency value A [GHz] of the peak position.

[0152] Figure 2The intervals d1 between the first unit u1 and the second unit u2, d2 between the second unit u2 and the third unit u3, and d3 between the third unit u3 and the first unit u1 shown in the diagram can be the same or different from each other. For example, interval d1 can be 0.2mm to 4mm, 0.3mm to 2mm, or 0.5mm to 1mm. Interval d2 can be 0.2mm to 4mm, 0.3mm to 2mm, or 0.5mm to 1mm. Interval d3 can be 0.2mm to 4mm, 0.3mm to 2mm, or 0.5mm to 1mm. If intervals d1, d2, and d3 are within the above-mentioned value ranges, the transmission area of ​​electromagnetic waves transmitted through the resistive layer 10 as a whole can easily be further extended based on the frequency value A [GHz] of the peak position. It should be noted that, as mentioned above, the values ​​of d1 to d3 can also be different in the first region 200 and the second region 210.

[0153] In the resistive layer 10, the first unit u1, the second unit u2, and the third unit u3 have the same shape. However, the shapes of the first unit u1, the second unit u2, and the third unit u3 may not be the same. That is, in another example of the present invention, the shapes of the first unit u1, the second unit u2, and the third unit u3 may be the same or different. Furthermore, in Figure 2 In the example, the orientations of the first unit u1, the second unit u2, and the third unit u3 are the same, but in each of the first unit u1, the second unit u2, and the third unit u3, the orientations of two adjacent units can also be different.

[0154] Here, Figure 3 The diagram shows a conductive pattern 300 of an electromagnetic wave absorbing component consisting of only a single region. In the conductive pattern 300 of the electromagnetic wave absorbing component, reference is made... Figure 2 The first unit u1, the second unit u2, and the third unit u3 are arranged along a single direction 301.

[0155] Figure 4 Figure 4A shows the absorption characteristics obtained by an electromagnetic wave absorbing member 1 having a conductive pattern 300 of a comparison object. The absorption rate is defined as the incident signal intensity P when an electromagnetic wave is incident in the Z direction, perpendicular to the incident surface of the electromagnetic wave absorbing member 1. in Let the reflected signal strength be P. ref Let the absorption rate be Ra, and calculate it as Ra = 1 - P ref / P inFurthermore, regarding the direction of the polarization of the incident electromagnetic wave, the vertically polarized wave, i.e., the wave whose electric field vibration direction is Y, is set to 0 degrees (0 deg), so that the electric field vibration direction is relative to... Figure 3 Ra is determined by rotating the Y-axis at 15-degree intervals. For example, in the case of a horizontally polarized wave, i.e., the direction of the electric field vibration is in the X direction, it is calculated as 90 degrees (90 deg).

[0156] When the polarization direction of the wave is 30 degrees, 45 degrees, and 60 degrees, such as Figure 4 As shown in Figure 4A, the absorptivity sometimes falls below 96% between 76 GHz and 76.2 GHz. Furthermore, it is known that the absorptivity varies by a maximum of about 5% depending on the direction of the polarized wave.

[0157] Based on Figure 2 The results of the measurement of the absorption rate of the electromagnetic wave absorbing component 1 are shown in Figure 4 4B. It should be noted that the direction of the polarized electromagnetic wave is... Figure 4 The 4A is the same. For example... Figure 4 As shown in 4B, it can be seen that the electromagnetic wave absorbing member 1 of this embodiment has an absorption rate of over 96% in any polarization direction. Furthermore, it can be seen that the difference in absorption rate caused by the different polarization directions is suppressed to about 3%.

[0158] like Figure 4 As shown in 4A, the electromagnetic wave absorption characteristics of the electromagnetic wave absorbing member having the conductor pattern 300 of the comparison object may vary depending on the direction of the conductor pattern relative to the direction of the polarization wave of the incident electromagnetic wave. Therefore, when using the electromagnetic wave absorbing member having the conductor pattern 300 of the comparison object, it is necessary to adjust the direction of the electromagnetic wave absorbing member 1 so that the direction of the polarization wave that exhibits high absorption characteristics when the electromagnetic wave is incident on the electromagnetic wave absorbing member is consistent with the direction of the polarization wave of the electromagnetic wave incident on the electromagnetic wave absorbing member. Furthermore, when inspecting multiple high-frequency components with different directions of emitted polarization waves, it is necessary to change the direction of the electromagnetic wave absorbing member for each inspection. In this way, in the electromagnetic wave absorbing member having the conductor pattern 300 of the comparison object, sometimes the electromagnetic wave absorption characteristics vary depending on the direction of the polarization wave of the incident electromagnetic wave.

[0159] On the other hand, the electromagnetic wave absorbing member 1 with the conductive pattern of this embodiment, by configuring multiple regions 200 and 210 with different characteristics for the direction of the polarization wave of the incident electromagnetic wave, can maintain the high absorption characteristics of the electromagnetic wave absorbing member 1 even when the direction of the polarization wave of the incident electromagnetic wave changes. Therefore, the electromagnetic wave absorbing member 1 can be used without considering the direction of the polarization wave of the incident electromagnetic wave, thus improving the convenience for the user when using the electromagnetic wave absorbing member.

[0160] Furthermore, in this embodiment, the electromagnetic wave absorbing member 1 arranges two or more types of units in a region. This allows for a wider frequency band of electromagnetic wave absorption by the electromagnetic wave absorbing member 1.

[0161] [First variation]

[0162] exist Figure 2 In the example, the illustration shows that the first region 200 and the second region 210 are repeatedly arranged at certain intervals in the X and Y directions. However, the arrangement of the first region 200 and the second region 210 can be different patterns.

[0163] Figure 5 The conductive pattern 600 of the electromagnetic wave absorbing member of the first modified example is shown in 5A. It should be noted that, for... Figure 2 The same configuration uses the same reference numerals, and descriptions are omitted. In the conductive pattern 600 of the first variation, the first region 200 and the second region 210 are alternately and repeatedly arranged in one direction. That is, it can be as follows: Figure 2 As shown, the first region 200 and the second region 210 are alternately and repeatedly configured in two dimensions, or as shown in the figure. Figure 5 Like 5A, the first region 200 and the second region 210 are alternately and repeatedly configured in one dimension.

[0164] [Second variation]

[0165] exist Figure 2 In one example, a first region 200, in which conductive elements are arranged along a first direction, and a second region 210, in which conductive elements are arranged along a second direction, are repeatedly arranged at intervals. In another example, the conductive pattern may be supplemented with regions in which conductive elements are arranged in a direction different from the first and second directions.

[0166] Figure 5 The conductive pattern 700 of the electromagnetic wave absorbing member in the second modified example is shown in 5B. It should be noted that, for... Figure 2 The same reference numerals are used for the same components, and descriptions are omitted. The conductive pattern 700 of the electromagnetic wave absorbing member includes a region 710 where units are arranged in the direction indicated by arrow 711 (hereinafter referred to as direction 711), a region 720 where units are arranged in the direction indicated by arrow 721 (hereinafter referred to as direction 721), a region 730 where units are arranged in the direction indicated by arrow 731 (hereinafter referred to as direction 731), and a region 740 where units are arranged in the direction indicated by arrow 741 (hereinafter referred to as direction 741). It should be noted that regions 710, 720, 730, and 740, except for the different unit arrangement directions, have the same characteristics as the reference numerals. Figure 2 The regions 200 and 210 have the same structure. In regions 710, 720, 730, and 740, the orientations of the unit arrangement 711, 721, 731, and 741 are different from each other.

[0167] It should be noted that, in Figure 5 In the 5B example, the arrangement of the cells is illustrated with 45-degree intervals, but this is not a limitation; for example, 22.5-degree intervals could also be used. Furthermore, in Figure 2 The diagram illustrates the arrangement of units along both the direction of arrow 201 and the direction of arrow 211. Figure 5 In 5B, the arrangement of units in four directions 711, 721, 731, and 741 is illustrated. However, in a conductive pattern, there can be multiple directions for arranging units; units can be arranged in three directions or more than five directions.

[0168] In addition, as referenced Figure 2 As explained, the configuration of the elements in regions 710–740 can be determined individually or by rotating and reversing the configuration of the elements in a region by at least one of these methods.

[0169] <Second Implementation Method>

[0170] like Figure 6 As shown in Figure 6A, the electromagnetic wave absorbing member 1 of the second embodiment includes a conductive pattern 800, which has a first region 200A, a second region 210A, a third region 220A, and a fourth region 230A (hereinafter, they are sometimes referred to as regions 200A to 230A without distinction). It should be noted that the description of the same configuration as in the first embodiment is omitted.

[0171] The first area 200A has the same reference Figure 2 The regions 200 described have the same configuration, and the units u1 to u3 have a first arrangement to a third arrangement 202 to 204 arranged along the first direction 201.

[0172] The second area 210A has the same characteristics as the reference. Figure 2 The second region 210A has the same configuration as the first region 200A. The second region 210A has the same units u1 to u3 as the first region 200A, but unlike the first region 200A, the units u1 to u3 are arranged along a third direction 211 different from the first direction 201. However, in the second region 210A, compared to the first region 200A, in addition to changing the direction of the arranged units, at least one of the following can be changed: the shape of the units u1 to u3, the size and spacing of any one of them, and the spacing between them.

[0173] The third region 220A differs from the adjacent first region 200A in at least one of the following: the shape, size, and spacing of the first to third units u1 to u3; and the spacing between their arrangement. Therefore, regions 200A and 220A have different electromagnetic wave transmission characteristics. It should be noted that in this embodiment, the first direction 201 for arranging units in the first region 200A and the second direction 211 for arranging units in the third region 220A are described as the same, but of course, the first direction 201 and the second direction 211 can also be different.

[0174] For example, preferably, when the first region 200A has the various units as described above, the third region 220A has the same type of units, and at least one of the surface area, thickness, and spacing of the units is reduced by a predetermined degree. Specifically, the surface area or thickness of each unit in the third region 220A is preferably 99% to 60% relative to the first unit u1 to the third unit u3 of the first region 200A, more preferably 95% to 80%. Furthermore, the spacing of the units in the third region 220A is preferably 99% to 60% relative to the first region 200A, more preferably 90% to 70%.

[0175] The fourth region 230A has the same units u1 to u3 as the third region 220A, but unlike the third region 220A, the units u1 to u3 are arranged along a fourth direction 231, which is different from the third direction 221. However, in the fourth region 230A, compared with the third region 220A, in addition to changing the direction of the arranged units, at least one of the following can be changed: the shape of the units u1 to u3, the size and spacing of any one of them, and the spacing between them.

[0176] Here, as a reference example, Figure 6 Figure 6B shows a conductor pattern 900 of an electromagnetic wave absorbing member consisting only of a first region 200A and a third region 220A. In the conductor pattern 900, reference is made to... Figure 6 The first region 200A and the third region 220A are configured alternately and repeatedly as described in 6A.

[0177] Figure 7 Figure 7A shows the absorption characteristics obtained by the electromagnetic wave absorbing member 1 with the conductive pattern 900 of the reference example. It should be noted that the polarization direction of the electromagnetic wave is... Figure 4 4A and 4B are the same. For example... Figure 7As shown in Figure 7A, the difference in absorptivity around 79 GHz is more than 8% when the polarization direction of the incident electromagnetic wave is 45 degrees and 135 degrees. In other words, the absorptivity varies by more than 8% depending on the angle of the conductor pattern 900 relative to the polarization direction of the incident electromagnetic wave. Furthermore, it is known that when the polarization direction of the incident electromagnetic wave is 30 degrees, 45 degrees, 60 degrees, and 75 degrees, the absorptivity of the conductor pattern 900 is less than 95% in the range of 78 GHz to 80.5 GHz.

[0178] Figure 7 7B shows a structure with Figure 6 The absorption characteristics of the electromagnetic wave absorbing component 1 with the conductive pattern 800 shown in Figure 6A are illustrated. It should be noted that the direction of the polarization of the electromagnetic wave is related to... Figure 7 The same as 7A. For example... Figure 5 As shown in Figure 5A, it can be seen that for any incident electromagnetic wave polarization direction, the absorption rate of the conductor pattern 800 exceeds 95% in the range of 76 GHz to 81 GHz. Furthermore, it can be seen that the variation in absorption rate caused by the angle of the conductor pattern 800 relative to the polarization direction of the incident electromagnetic wave is suppressed to less than 5%.

[0179] from Figure 7 As shown in results 7A and 7B, the electromagnetic wave absorption characteristics of the electromagnetic wave absorbing member with the conductor pattern 900 of the reference example may vary depending on the orientation of the conductor pattern relative to the direction of the polarized wave of the incident electromagnetic wave. Therefore, when using the electromagnetic wave absorbing member with the conductor pattern 900 of the reference example, it is necessary to adjust the orientation of the electromagnetic wave absorbing member 1 so that the direction of the polarized wave exhibiting high absorption characteristics when the electromagnetic wave is incident on the electromagnetic wave absorbing member is consistent with the direction of the polarized wave of the electromagnetic wave incident on the electromagnetic wave absorbing member. Furthermore, when inspecting multiple high-frequency components with different directions of emitted polarized waves, it is necessary to change the orientation of the electromagnetic wave absorbing member for each inspection.

[0180] On the other hand, the electromagnetic wave absorbing member 1 with the conductive pattern 800 of this embodiment, by configuring multiple regions 200A, 210A, 220A, and 230A with different characteristics for the direction of the polarization wave of the incident electromagnetic wave, can maintain the high absorption characteristics of the electromagnetic wave absorbing member 1 even when the direction of the polarization wave of the incident electromagnetic wave changes. Therefore, the electromagnetic wave absorbing member 1 can be used without considering the direction of the polarization wave of the incident electromagnetic wave, thus improving the convenience for the user when using the electromagnetic wave absorbing member 1.

[0181] Next, regarding Figure 3 The conductor pattern 300 shown Figure 6 The conductor pattern 900 shown in 6B Figure 6 The conductor pattern 800 shown in 6A exhibits a variation in the absorption characteristics of electromagnetic waves in the range of 76 GHz to 81 GHz when the thickness of the spacer layer 20 is varied. Table 1 shows this variation.

[0182] [Table 1]

[0183]

[0184] As shown in Table 1, Figure 3 In the conductive pattern 300 shown, with a spacer layer 20 thickness of 1.8 mm, the maximum absorption rate from 76 GHz to 81 GHz is 87.0%, and with a spacer layer 20 thickness of 1.8 mm, the minimum absorption rate from 76 GHz to 81 GHz is 68.4%. Figure 6 In the conductive pattern 900 shown in 6B, with a spacer layer 20 thickness of 1.8 mm, the maximum absorption rate from 76 GHz to 81 GHz is 89.4%, and with a spacer layer 20 thickness of 1.8 mm, the minimum absorption rate from 76 GHz to 81 GHz is 85.1%. Figure 6 In the conductive pattern 800 shown in 6A, the maximum absorption rate from 76 GHz to 81 GHz is 91.6% when the thickness of the spacer layer 20 is 2.2 mm, and the minimum absorption rate from 76 GHz to 81 GHz is 87.6% when the thickness of the spacer layer 20 is 1.8 mm. Thus, it can be seen that the conductive pattern 800 according to this embodiment exhibits stable absorption characteristics even when the thickness of the spacer layer varies greatly.

[0185] Furthermore, in this embodiment, the electromagnetic wave absorbing member 1 arranges two or more types of units in a region. This allows for a wider frequency band of electromagnetic wave absorption by the electromagnetic wave absorbing member 1.

[0186] [First variation]

[0187] exist Figure 6 In the example of 6A, the first region 200A and the third region 220A are regions that differ in at least one of the shapes, sizes, spacing, and arrangement intervals of the units u1 to u3. The second region 210A and the fourth region 230A are regions whose arrangement orientations differ from those of the first region 200A and the third region 220A. In one example, it is also possible to configure three or more regions with the same arrangement orientation, but where at least one of the shapes, sizes, spacing, and arrangement intervals of the units u1 to u3 included in the region differs. Hereinafter, refer to... Figures 8-9 The conductive pattern of an electromagnetic wave absorbing component with three or more regions arranged in the same direction is described.

[0188] Figure 8 A portion of the conductor pattern of the first modified example is shown in 8A. The conductor pattern of the first modified example has regions 200A to 200C. Region 200A is shown in reference... Figure 2 As explained, units u1 to u3 are arranged along direction 201. Regions 200B and 200C are arranged with the same units u1 to u3 as region 200A along the same direction 201, but the arrangement of arrangements 202 to 204 differs from that in region 200A. For example, in regions 200A to 200C, arrangements 202 to 204 are arranged in the same order in directions orthogonal to the unit arrangement direction 201. On the other hand, the longest arrangement along the unit arrangement direction 201 is arrangement 204 in region 200A, while in region 200B it is arrangement 203, and in region 200C it is arrangement 202.

[0189] In addition, such as Figure 8 As shown in 8B, the conductor pattern of the first modified example has regions 220A to 220C. Region 220A has units u1 to u3 arranged along direction 221. Regions 220B and 220C have the same units u1 to u3 as region 220A along the same direction 221, but the arrangement of arrangement 222 to 224 is different from that of region 220A.

[0190] It should be noted that, in Figure 8 In the examples shown in 8A and 8B, regions 200A-200C and 220A-220C are adjacent, but the configuration of regions 200A-200C and 220A-220C is not limited to this.

[0191] Figure 9 An example of a conductor pattern of the first modified example is shown in 9A. Figure 9 The conductor pattern 1400 shown in 9A includes rows 1410 to 1460 arranged along the Y-axis direction. It should be noted that rows 1410 to 1460 may also be arranged below row 1460 in the Y-axis direction. That is, multiple rows 1410 to 1460 can be arranged at equal intervals along the Y-axis direction.

[0192] In line 1410, the region is referenced. Figure 8 The regions 200A, 220A, 200B, 220B, 200C, and 220C, as described by 8A and 8B, are arranged in the order along the X-axis.

[0193] In row 1420, regions are arranged along the X-axis in the order of regions 230A, 210B, 230B, 210C, 230C, and 210A. Here, region 210A is the region where the orientation of the cell arrangement in region 200A is changed from 201 to 211. Similarly, regions 210B and 210C are the regions where the orientation of the cell arrangement in regions 200B and 200C is changed from 201 to 211, respectively. Likewise, regions 230A, 230B, and 230C are the regions where the orientation of the cell arrangement in regions 220A to 220C is changed from 221 to 231, respectively.

[0194] It should be noted that in regions 210A to 210C, at least one of the shapes, sizes, and spacings of the units u1 to u3 included in the region, as well as the spacing between their arrangements, can be different from each other.

[0195] Furthermore, in regions 230A to 230C, at least one of the shapes, sizes, and spacings of the units u1 to u3 included in the region, as well as the spacing between their arrangements, can be different from each other.

[0196] In row 1430, the regions are arranged along the X-axis in the order of regions 200B, 220B, 200C, 220C, 200A, 220A. In row 1440, the regions are arranged along the X-axis in the order of regions 230B, 210C, 230C, 210A, 230A, 220B. In row 1450, the regions are arranged along the X-axis in the order of regions 200C, 220C, 200A, 220A, 200B, 220B. In row 1460, the regions are arranged along the X-axis in the order of regions 230C, 210A, 230A, 210B, 230B, 210C.

[0197] As described above, regions 200A-200C and 210A-210C have electromagnetic wave transmission characteristics that differ from those of regions 220A-220C and 230A-230C. Therefore, by arranging regions with different electromagnetic wave transmission characteristics adjacent to each other, the electromagnetic wave transmission characteristics can be well maintained when viewed as a whole in the conductor pattern 1400. Furthermore, as shown in rows 1410-1460, the regions are arranged in different ways in the direction of the arrangement of units u1-u3 in the Y direction. As a result, the conductor pattern 1400 as a whole can well maintain the electromagnetic wave absorption characteristics based on the direction of the polarization of the incident electromagnetic wave.

[0198] [Second variation]

[0199] exist Figure 6 6A Figure 9In the example of 9A, it was explained that in two adjacent regions in the X direction, the arrangement of elements u1 to u3 is in the same direction. In one example, it is also possible to configure regions in adjacent regions in the XY direction with different arrangements of elements u1 to u3.

[0200] Figure 9 The conductor pattern 1500 of the second modified example is shown in 9B. Figure 9 In 9B, with Figure 9 The same areas 200A to 230C of 9A are configured with different patterns. Conductor pattern 1500 includes rows 1510 to 1560.

[0201] In row 1510, regions 200A, 210A, 220B, 230B, 200C, and 210C are arranged along the X direction. In row 1520, regions 230A, 220A, 210B, 200B, 230C, and 220C are arranged along the X direction. In row 1530, regions 200B, 210B, 220C, 230C, 200A, and 210A are arranged along the X direction. In row 1540, regions 230B, 220B, 210C, 200C, 230A, and 220A are arranged along the X direction. In row 1550, regions 200C, 210C, 220A, 230A, 200B, and 210B are arranged along the X direction. In row 1560, regions 230C, 220C, 210A, 200A, 230B, and 220B are arranged along the X direction.

[0202] In this way, in either the X or Y direction, the regions are arranged in different orientations, with units u1 to u3 arranged in adjacent regions. Therefore, the conductor pattern 1500 as a whole can well maintain the electromagnetic wave absorption characteristics based on the polarization direction of the incident electromagnetic wave. Furthermore, by arranging regions with different electromagnetic wave transmission characteristics in every two regions in the X direction and in each region in the Y direction, the electromagnetic wave transmission characteristics can be well maintained when viewed as a whole, considering the conductor pattern 1500.

[0203] It should be noted that the regions can be configured in a way that the unit configurations in adjacent regions in the XY direction are different, and the configuration pattern of the regions is not limited to this.

[0204] <Other Implementation Methods>

[0205] The invention is not limited to the above-described embodiments and can be modified and altered in various ways within the scope of the invention's intent.

[0206] exist Figure 2 , Figure 5 , Figure 6 6A Figure 9 In the example, the arrangement of the first to third units in a region is described. In one example, two units can also be arranged in a region, and four or more types of units can also be arranged. That is, the electromagnetic wave absorbing component only needs to have two or more regions including a first region and a second region. The first region includes one or more first arrangements of first units arranged along a first direction and second arrangements of second units different from the first units arranged along the first direction. The second region includes one or more third and fourth arrangements of first units and second units arranged along a second direction different from the first direction. The number of arrangements and the number of regions can be changed appropriately.

[0207] Furthermore, in this embodiment, the region is described as rectangular. However, the shape of the region can be a quadrilateral shape including a parallelogram, a triangle, a hexagon, or a polygon, and is not limited to a rectangular shape.

[0208] In addition, Figure 2 , Figure 5 , Figure 6 6A Figure 9 In the example, two arrangements are shown configured so that they do not overlap in the direction of the cell arrangement. However, multiple arrangements can also be configured to overlap in the direction of the cell arrangement. For example, an arrangement of three cells u1 arranged along the direction of arrow 201 followed by an arrangement of three cells u2 can also be configured.

[0209] exist Figure 6 In section 6A, two orientations for the arrangement of the units are described. However, there can also be three or more orientations for the arrangement of the units. For example, the area can be designed with four orientations for the arrangement of the units, such as 0 degrees, 30 degrees, 60 degrees, and 90 degrees.

[0210] Explanation of reference numerals in the attached figures

[0211] 1: Electromagnetic wave absorbing component;

[0212] 10: Resistive layer;

[0213] 11: Substrate;

[0214] 12: Conductor pattern;

[0215] 20: Spacing layer;

[0216] 30: Reflective layer;

[0217] 200: First area;

[0218] 250: Second region;

[0219] 210, 260: First row;

[0220] 220, 270: Second arrangement;

[0221] 230, 280: Third arrangement.

Claims

1. An electromagnetic wave absorbing member, characterized by, Includes a resistive layer with a conductive pattern. The resistive layer has a first region and a second region with different electromagnetic wave transmission characteristics. The first region has the following conductive pattern: It has multiple first arrangements, and each first arrangement is configured with multiple first units. It has multiple second arrangements, each of which is configured with multiple second units different from the first unit. The second region has the following conductive pattern: Having multiple of the first arrangement, Having multiple second arrangements, In the first region, multiple first and second units are arranged along a first direction. In the second region, multiple first and second units are arranged along a second direction different from the first direction. In the first region and the second region, the first arrangement and the second arrangement are arranged adjacent to each other.

2. The electromagnetic wave absorbing component according to claim 1, wherein, The first region has multiple third arrangements, each third arrangement having multiple third units that are different from both the first unit and the second unit. The second region has multiple of the third arrangements. In the first region, the third unit is configured along the first direction. In the second region, the third unit is configured along the second direction.

3. The electromagnetic wave absorbing component according to claim 1 or 2, wherein, The conductive pattern in the second region is a pattern formed by rotating and reversing at least one of the conductive patterns in the first region.

4. The electromagnetic wave absorbing component according to any one of claims 1 to 3, wherein, The first region and the second region are repeatedly configured with a certain interval between them.

5. The electromagnetic wave absorbing member according to any one of claims 1 to 4, wherein, The resistive layer also has a third region and a fourth region with different electromagnetic wave transmission characteristics. The third region has the following conductive pattern: It has an arrangement of multiple fourth units configured along the first direction. It has an arrangement of multiple fifth units, different from the fourth unit, along the first direction. The fourth region has the following conductive pattern: It has an arrangement of multiple fourth units configured along the second direction. It has an arrangement of multiple fifth units configured along the second direction. The first region and the third region differ in at least one of the following: the spacing of the conductive patterns, the shape of the units included in the arrangement, the size of the units, and the spacing of the units. The second region and the fourth region differ in at least one of the following: the spacing of the conductive patterns, the shape of the units included in the arrangement, the size of the units, and the spacing of the units.

6. The electromagnetic wave absorbing component according to claim 5, wherein, The third region has an arrangement of multiple sixth units, each different from the fourth and fifth units, along the first direction. The fourth region has multiple arrangements of the sixth units configured along the second direction.

7. The electromagnetic wave absorbing component according to claim 5 or 6, wherein, The third region and the fourth region are repeatedly configured at certain intervals.

8. The electromagnetic wave absorbing member according to any one of claims 1 to 7, wherein, The conductive pattern in the fourth region is a pattern formed by rotating and reversing at least one of the conductive patterns in the third region.

9. The electromagnetic wave absorbing member according to any one of claims 5 to 8, wherein, The first region is configured such that it is adjacent to at least one of the third and fourth regions and not adjacent to the second region.

10. The electromagnetic wave absorbing member according to any one of claims 5 to 8, wherein, The first region is configured to be adjacent to at least one of the second region and the fourth region, but not adjacent to the third region.

11. The electromagnetic wave absorbing member according to any one of claims 1 to 10, wherein, The electromagnetic wave absorbing component has a fifth region, which has the following conductive pattern: having multiple first arrangements and multiple second arrangements. In the fifth region, Multiple first and second units are configured along a third direction different from both the first and second directions. The first arrangement and the second arrangement are arranged adjacent to each other.

12. The electromagnetic wave absorbing member according to any one of claims 1 to 11, wherein, The electromagnetic wave absorbing component also has a spacer layer and a reflective layer.

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