JP7410486B2 - Electromagnetic wave transmission sheet - Google Patents

Description

The present invention relates to an electromagnetic wave transmission sheet, and particularly to an electromagnetic wave transmission sheet that can reduce dispersion of received power due to differences in reception positions on the sheet.

An electromagnetic wave transmission sheet is known in which the front and back surfaces of a sheet-like dielectric layer (insulator) are sandwiched between two sheet-like conductive layers (good conductors). When electromagnetic waves are input into the electromagnetic wave transmission sheet, the electromagnetic waves propagate inside the induction layer. If one of the conductive layers is formed into a continuous mesh pattern, evanescent waves are generated on the mesh surface. The intensity of the evanescent wave attenuates exponentially depending on the distance from the mesh-like conductive layer. That is, by forming one of the conductive layers into a mesh shape, it is possible to create a state in which evanescent waves seep out only near the surface of the conductive layer.

By transmitting signals using evanescent waves as a medium, it is possible to communicate between a plurality of different positions on the sheet. Further, by rectifying the evanescent waves into direct current, it is possible to extract electrical energy at any position on the sheet (see Patent Document 1).

In this case, it is known that by making the mesh-like wiring pattern of the conductive layer into a meander shape, it is possible to improve the uniformity and seepage amount of evanescent waves, and improve communication performance and power supply performance (Patent Document 2) .

Patent No. 4538594 International Publication No. 2017/138475

However, there is still room for further improvement in improving the uniformity of the evanescent wave intensity in the electromagnetic wave transmission sheet. For example, the inventors found that even when using an electromagnetic wave transmission sheet having a meander-shaped pattern as described in Patent Document 2, the transmission of electromagnetic waves depends on the position on the sheet, more specifically, the distance from the electromagnetic wave input point discovered that there can be variations in the amount of power that can be extracted.

The present invention has been made to solve such problems, and an object of the present invention is to provide an electromagnetic wave transmission sheet that can reduce dispersion of received power due to differences in reception positions on the sheet.

An electromagnetic wave transmission sheet according to an embodiment of the present invention includes a dielectric layer, a first conductive layer covering a back surface of the dielectric layer, and a second conductive layer covering a surface of the dielectric layer, The second conductive layer is a combination of a plurality of conductive layers each having a mesh-like wiring pattern, and at least a part of the end of the mesh-like wiring pattern is connected to the other mesh-like wiring pattern through an insulator. It overlaps with the wiring pattern.
An electromagnetic wave transmission sheet according to an embodiment of the present invention includes a plurality of sheet pieces in which a conductive layer having the mesh-like wiring pattern and a protective layer made of an insulator are laminated, and at least A portion overlaps with the other sheet piece.
In an electromagnetic wave transmission sheet according to an embodiment of the present invention, conductive layers having the mesh-like wiring pattern are formed on the front and back surfaces of a protective layer made of an insulator, and the mesh formed on one surface At least a part of the end of the conductive layer having the mesh-like wiring pattern overlaps the conductive layer having the mesh-like wiring pattern formed on the other surface.
An electromagnetic wave transmission sheet according to an embodiment of the present invention includes a plurality of protective layers made of an insulator in which a conductive layer having the mesh-like wiring pattern is formed in a partial region, and At least a part of the end portion of the conductive layer having the mesh-like wiring pattern overlaps with the conductive layer having the mesh-like wiring pattern formed on the other protective layer.

According to the present invention, it is possible to provide an electromagnetic wave transmission sheet that can reduce dispersion of received power due to differences in reception positions on the sheet.

1 is a plan view showing the configuration of a conventional electromagnetic wave transmission sheet 1. FIG. 1 is a cross-sectional view showing the configuration of a conventional electromagnetic wave transmission sheet 1. FIG. 3 is a diagram showing an example of a mesh-like wiring pattern of the second conductive layer 13. FIG. 3 is a diagram showing an example of a configuration of a power feeding port 16. FIG. 3 is a diagram showing an example of a configuration of a power feeding port 16. FIG. 3 is a diagram showing an example of a configuration of a power feeding port 16. FIG. 2 is a cross-sectional view showing a typical structure of a coupler 20. FIG. 1 is a plan view of an electromagnetic wave transmission sheet 1 according to an embodiment of the present invention. 1 is a plan view of an electromagnetic wave transmission sheet 1 according to an embodiment of the present invention. 1 is a sectional view of an electromagnetic wave transmission sheet 1 according to an embodiment of the present invention. 1 is a sectional view of an electromagnetic wave transmission sheet 1 according to an embodiment of the present invention. 1 is a sectional view of an electromagnetic wave transmission sheet 1 according to an embodiment of the present invention. 1 is a sectional view of an electromagnetic wave transmission sheet 1 according to an embodiment of the present invention. 1 is a plan view of an electromagnetic wave transmission sheet 1 according to an embodiment of the present invention. 1 is a plan view of an electromagnetic wave transmission sheet 1 according to an embodiment of the present invention. FIG. 3 is a diagram showing experimental results. FIG. 3 is a diagram showing experimental results.

Embodiments of the present invention will be described using the drawings. First, a conventional electromagnetic wave transmission sheet and a communication and power supply method using the same will be explained using FIGS. 1 to 6.

FIG. 1 is a diagram showing the configuration of a conventional electromagnetic wave transmission sheet 1. As shown in FIG. FIG. 1A is a plan view of the electromagnetic wave transmission sheet 1, and FIG. 1B is an enlarged sectional view taken along line XX in FIG. 1A. As shown in FIGS. 1A and 1B, the electromagnetic wave transmission sheet 1 includes a dielectric layer 11, a first conductive layer 12 that covers the back surface 11R of the dielectric layer 11, a second conductive layer 13 that covers the front surface 11S of the dielectric layer 11, and It has a power supply port 16. Preferably, the electromagnetic wave transmission sheet 1 further includes a third conductive layer 14 that covers the end portion 11E of the dielectric layer 11 and a protective layer 15 that covers the second conductive layer 13.

The dielectric layer 11 is made of a dielectric material in the form of a sheet (having a wide surface and a thin outer shape, such as a plate, a membrane, a cloth, a paper, a foil, a film, and a mesh). It is a region of The material of the dielectric layer 11 may be air, water, cloth, paper, resin, etc., or may be a vacuum. Further, the thickness of the dielectric layer 11 can be appropriately set depending on the dielectric constant of the material used and the frequency of electromagnetic waves. For example, when the dielectric layer 11 is a foamed polyethylene plate (dielectric constant 2.3) and the electromagnetic wave is in the 2.45 GHz band, the thickness T may be set to about 5 mm in order to improve the input/output efficiency of the electromagnetic wave.

The first conductive layer 12 is a sheet-shaped member made of a good conductor. For example, the first conductive layer 12 is a metal foil made of copper, aluminum, or the like and has a thickness of about 0.1 mm.

The second conductive layer 13 is a sheet-shaped member made of a good conductor and having a mesh-like wiring pattern. For example, the second conductive layer 13 can be created by printing a mesh-like wiring pattern on an insulating sheet (resin sheet, etc.) with a thickness of about 0.5 mm using conductive ink. Alternatively, it may be created by forming holes in a sheet-like good conductor in a predetermined pattern.

FIG. 2 is a diagram showing an example of a mesh-like wiring pattern of the second conductive layer 13. Macroscopically, the wiring pattern shown in FIG. 2 is a mesh pattern in which two approximately parallel linear patterns (stripe patterns) are combined at an approximately 90 degree angle. Regularly formed. Microscopically, each straight line has a meander shape due to a folded pattern. The wiring material may be any good conductor, and typically copper or aluminum is used. The entire wiring pattern is electrically connected and continuous. The line width W and arrangement pitch of the second conductive layer 13 can be appropriately set depending on the frequency of electromagnetic waves and the like. For example, when the electromagnetic wave is in the 2.45 GHz band, in order to improve the input/output efficiency of the electromagnetic wave (impedance is 50Ω), the line width W is 0.5 mm or more and 1.5 mm or less, and the mesh pattern arrangement pitch P is 8 mm. It can be set to a certain degree.

The third conductive layer 14 is a member made of a good conductor and covers the end portion 11E of the dielectric layer 11. The third conductive layer 14 short-circuits the first conductive layer 12 and the second conductive layer 13 at the ends of the dielectric layer 11 to prevent leakage of electromagnetic waves from the ends of the electromagnetic wave transmission sheet 1. . Note that the third conductive layer 14 does not necessarily need to cover the entire end portion 11E of the dielectric layer 11, and may be formed, for example, in a mesh shape or stripe shape to suppress leakage of electromagnetic waves from the end portion of the electromagnetic wave transmission sheet 1. It may be something. The material of the third conductive layer 14 may be any good conductor, and typically copper or aluminum is used.

The protective layer 15 includes a first protective layer 15A and a second protective layer 15B. The first protective layer 15A and the second protective layer 15B are made of an insulator and protect the outer surfaces of the first conductive layer 12 and the second conductive layer 13, that is, the surfaces opposite to the dielectric layer 11. It is a member. The material of the protective layer 15 may be any insulator, and a sheet of polyethylene, polypropylene, or the like is used. By providing the protective layer 15, the durability of the electromagnetic wave transmission sheet 1 can be improved.

FIG. 3 is a diagram showing an example of the configuration of the power feeding port 16. As shown in FIG. The power supply port 16 is a port for inputting electromagnetic waves into the electromagnetic wave transmission sheet 1 . In the example of FIG. 3, the feeding port 16 is an inverted F-type antenna, which includes a columnar first feeding body 161, a hollow columnar second feeding body 162, a plate-shaped first feeding plate 163, and a plate-shaped first feeding body 162. It has at least a second power supply plate 164. The first power supply body 161, the second power supply body 162, the first power supply plate 163, and the second power supply plate 164 are made of a good conductor, such as copper or aluminum. The first power supply body 161 penetrates the dielectric layer 11 and is electrically connected to the first power supply plate 163. The second power supply body 162 is electrically connected to the second power supply plate 164. Here, in FIG. 3, when the upper direction is the front side and the lower direction is the back side, the first power supply body 161 and the second power supply body 162 both protrude to the front side. The second power supply body 162 is a columnar body having a hollow structure, and is arranged to surround the periphery of the columnar first power supply body 161. The first power supply plate 163 is provided apart from the surface of the first protective layer 15A, that is, the first conductive layer 12. The second power supply plate 164 is provided apart from the surface of the second protective layer 15B, that is, the mesh-shaped second conductive layer 13.

A coaxial cable is connected to the power supply port 16 via, for example, an SMA (Sub-Miniature Type A) connector. By connecting an oscillator (not shown) to one end of the coaxial cable, high frequency power is supplied to the power feeding port 16 via the coaxial cable. Since the power feeding port 16 is capacitively coupled to the electromagnetic wave transmission sheet 1 by the first power feeding plate 163 and the second power feeding plate 164, high frequency power supplied from the coaxial cable is transmitted to the electromagnetic wave transmission sheet 1. As described above, since the power feeding port 16 is an inverted F-type antenna, it is possible to supply power in a small size and with high efficiency.

Note that, as shown in FIG. 4, the connection port of the power feeding port 16 to the coaxial cable may be provided on the back side of the electromagnetic wave transmission sheet 1. That is, when the upper direction is the front side and the lower direction is the back side in FIG. 4, the first power supply body 161 and the second power supply body 162 are both projected to the back side. In this case, the first power supply plate 163 is provided apart from the surface of the second protective layer 15B, that is, the mesh-like second conductive layer 13. The second power supply plate 164 is provided apart from the surface of the first protective layer 15A, that is, the first conductive layer 12.

In the example of FIG. 3, an impedance matching circuit between the power supply port 16 and the electromagnetic wave transmission sheet 1 may be configured by short-circuiting the end of the second power supply plate 164 with the first conductive layer 12. In the example of FIG. 4, an impedance matching circuit between the power supply port 16 and the electromagnetic wave transmission sheet 1 may be configured by short-circuiting the end of the first power supply plate 163 with the first conductive layer 12. At this time, the end of the second power supply plate 164 or the first power supply plate 163 may be short-circuited with the first conductive layer 12 via the third conductive layer 14 . This further improves impedance matching between the power feeding port 16 and the electromagnetic wave transmission sheet 1, so that power feeding efficiency can be improved.

As shown in FIG. 5, the power supply port 16 may be of a clip type in which the front and back surfaces of the end portion of the electromagnetic wave transmission sheet 1 are sandwiched between two power supply plates. In the example of FIG. 5, the power supply port 16 includes a first power supply plate 163 provided on the end surface of the first protective layer 15A, and a first power supply plate 163 provided on the end surface of the second protective layer 15B. 2 power supply plate 164, a columnar first power supply body 161 electrically connected to the first power supply plate 163, and a hollow columnar second power supply body electrically connected to the second power supply plate 164. 162. Note that an insulator 165 may be interposed between the first power supply body 161 and the second power supply body 162.

In the clip type shown in FIG. 5 as well, the end of the second power supply plate 164 may be short-circuited with the first conductive layer 12 to form an impedance matching circuit with the electromagnetic wave transmission sheet 1. As a result, impedance matching with the electromagnetic wave transmission sheet 1 is improved similarly to the power feeding port 16 shown in FIGS. 3 and 4, so that power feeding efficiency can be improved.

Note that the shapes of the first power supply body 161 and the second power supply body 162 shown in FIGS. 3 to 5 are not limited to columnar shapes, and can be made into various shapes. Further, the shapes of the first power supply plate 163 and the second power supply plate 164 shown in FIGS. 3 to 5 can be various shapes other than circular or rectangular.

When performing communication or power supply using the electromagnetic wave transmission sheet 1, a coupler 20 is used as shown in FIG. 1B. The coupler 20 is electrically connected to the device 30 by a cable L1 or the like. When an oscillator (not shown) is outputting electromagnetic waves (typically in the 2.45 GHz band) into the electromagnetic wave transmission sheet 1 through the power supply port 16, the coupler 20 is connected to the surface of the electromagnetic wave transmission sheet 1 (the mesh-like second When placed on or close to the side where the conductive layer 13 is present, the coupler 20 functions as an antenna that receives evanescent waves and converts them into current. This allows the device 30 to communicate or receive power. When communicating, an information communication device capable of communicating using electromagnetic waves in the frequency band radiated within the electromagnetic wave transmission sheet 1 as a medium is connected to the coupler 20 as a device 30. When supplying power, various devices powered by the power acquired by the coupler 20 are connected to the coupler 20 as devices 30 .

FIG. 6 is a cross-sectional view showing a typical structure of the coupler 20. The coupler 20 includes a casing 21 made of a good conductor, a dielectric 22 filled in the casing 21, and a plate-shaped internal electrode 23 made of a good conductor. For example, copper or aluminum can be used as a good conductor.

The electromagnetic wave RW confined in the dielectric 22 between the housing 21 and the internal electrode 23 propagates to the cable L1 as a signal (indicated by a chain line in FIG. 6). In this way, signals can be transmitted and received between the electromagnetic wave transmission sheet 1 and the coupler 20 placed on or in close proximity to the surface of the electromagnetic wave transmission sheet 1, using the evanescent waves seeped onto the surface of the electromagnetic wave transmission sheet 1 as a medium. By placing a plurality of couplers 20 on the surface of the electromagnetic wave transmission sheet 1 or bringing them close to each other, signals can be transmitted and received between the plurality of couplers 20 via the electromagnetic wave transmission sheet 1.

Further, at this time, an alternating current voltage is generated between the housing 21 and the internal electrode 23. By rectifying this voltage change, power for operating the device 30 is obtained.

Next, the structure of the electromagnetic wave transmission sheet 1 according to the embodiment of the present invention will be described using FIGS. 7 to 13. 7A and 7B are plan views of the electromagnetic wave transmission sheet 1. FIG. 8 to 11 are diagrams showing an example of the configuration of the electromagnetic wave transmission sheet 1, and are enlarged sectional views taken along line XX in FIGS. 7A and 7B. 12 and 13 are plan views showing an example of the configuration of the electromagnetic wave transmission sheet 1. FIG. Note that here, the differences from the conventional electromagnetic wave transmission sheet 1 will be mainly explained, and the explanation of the same components as the conventional one will be omitted as appropriate.

In the electromagnetic wave transmission sheet 1 according to the present embodiment, the second conductive layer 13 is configured by combining a plurality of conductive layers 17 having a smaller area than the second conductive layer 13. Each conductive layer 17 has a mesh-like wiring pattern made of a good conductor. Note that for the sake of simplicity of explanation, mesh patterns made of straight lines are shown in FIGS. 7 to 13, but the present invention is not limited to this, and mesh patterns made of meander shapes as shown in FIG. 2 are shown. A mesh pattern may also be used.

The conductive layer 17 is arranged so that at least a portion of its end 17E overlaps another conductive layer 17. For example, as shown in FIG. 7A, the conductive layers 17 can be arranged so that they overlap each other by a width dx at an end 17E appearing in the X direction, and by a width dy at an end 17E appearing in the Y direction. The widths dx and dy can be appropriately set to any value greater than or equal to 0. Alternatively, the conductive layers 17 may be overlapped only at the ends 17E appearing in the X direction or only at the ends 17E appearing in the Y direction. For example, as shown in FIG. 7B, in an elongated electromagnetic wave transmission sheet 1 in which one side is longer than the other side, a conductive layer 17 having a smaller area than the second conductive layer 13 is placed at the end portion appearing in the Y direction. The second conductive layer 13 may be configured by overlapping only the layers 17E by the width dy. In either form, when the conductive layers 17 are superimposed on each other, the conductive layers 17 are insulated so that they are not electrically continuous. Specific configuration examples of the second conductive layer 13 will be described below as Examples 1 to 3.

<Example 1>
As shown in the cross-sectional view of FIG. 8 or 9, a plurality of sheet pieces 19 in which a conductive layer 17 and an insulating layer 18 are laminated are prepared. The insulating layer 18 is a sheet made of an insulator and has approximately the same area as the conductive layer 17, and serves both as an insulating layer and as a base material for the conductive layer 17. The second conductive layer 13 is formed by arranging a plurality of sheet pieces 19 so as to cover the dielectric layer 11. At this time, the sheets are combined so that the ends of the sheet pieces 19 overlap the ends of the adjacent sheet pieces 19. In the portion where the sheet pieces 19 overlap, the insulating layer 18 of the lower sheet piece 19 insulates the overlapping conductive layers 17 from each other, so that the two are electrically discontinuous.

According to the method of Example 1, the electromagnetic wave transmission sheet 1 can be created by pasting together sheet pieces 19 smaller than the electromagnetic wave transmission sheet 1, so there is an advantage that it is easy to create a relatively large electromagnetic wave transmission sheet 1.

<Example 2>
As shown in the cross-sectional view of FIG. 10 and the plan view of FIG. 12, a plurality of sheet pieces 19 are prepared in which a conductive layer 17 is laminated only in a partial region of an insulating layer 18 having approximately the same area as the electromagnetic wave transmission sheet 1. That is, regions functioning as the conductive layer 17 are arranged in a predetermined pattern in each of the plurality of sheet pieces 19 (upper left diagram and lower left diagram in FIG. 12). The arrangement pattern of the conductive layer 17 is such that when the plurality of sheet pieces 19 are superimposed on the dielectric layer 11 and viewed from the front side, the conductive layers 17 formed on the plurality of sheet pieces 19 complement each other. It is determined to cover the surface of the dielectric layer 11 without any gaps (see the right diagram in FIG. 12). That is, in a region where the conductive layer 17 is not present in a certain sheet piece 19, the conductive layer 17 is arranged in another sheet piece 19. Further, in the conductive layers 17 whose end portions 17E are adjacent to each other when viewed from the front side, the end portions 17E of the conductive layers 17 are at least partially overlapped. The second conductive layer 13 can be formed by laminating a plurality of sheet pieces 19 designed in this way on the dielectric layer 11. Also in this example, the insulating layer 18 of the sheet piece 19 located on the lower side in FIG. 10 insulates the overlapping conductive layers 17 from each other, so that they are electrically discontinuous.

For example, as shown in FIG. 12, two sheet pieces 19 having tile-shaped conductive layers 17 arranged in a checkered pattern are prepared. In the example of FIG. 12, the corner portions of the plurality of conductive layers 17 arranged on each sheet piece 19 overlap, but they do not necessarily have to overlap. The arrangement pattern of the conductive layer 17 in the two sheet pieces 19 is interpolated, and is designed so that when the two sheet pieces 19 are overlapped, the surface of the dielectric layer 11 is covered with the conductive layer 17 without any gaps. Further, the size of the tile-shaped conductive layer 17 is set such that when two sheet pieces 19 are overlapped, the ends 17E of the conductive layer 17 overlap to some extent.

<Example 3>
As shown in the cross-sectional view of FIG. 11 and the plan view of FIG. It is also possible to use the second conductive layer 13 as the second conductive layer 13.

For example, the conductive layer 17 formed on a certain sheet piece 19 in Example 1 is laminated on one side of the insulating layer 18 of this example, and the other sheet piece 19 disposed adjacent to the sheet piece 19 is laminated on one side of the insulating layer 18 of this example. By laminating the conductive layer 17 previously formed on the other surface of the insulating layer 18 of this example, the plurality of sheet pieces 19 in Example 1 can be combined into one sheet.

In addition, the checkered conductive layer 17 formed on one sheet piece 19 in Example 2 is laminated on one side of the insulating layer 18 of this example, and the checkered conductive layer 17 formed on another sheet piece 19 is laminated on one side of the insulating layer 18 of this example. By laminating the layer 17 on the other surface of the insulating layer 18 of this example, the plurality of sheet pieces 19 in Example 2 can be combined into one sheet.

In this example, the insulating layer 18 insulates the conductive layers 17 stacked on the front and back surfaces, so that they are electrically discontinuous. Note that in this example, the conductive layer 17 stacked on the surface of the insulating layer 18 is exposed to the outside. In order to protect this, another protective layer may be provided outside the exposed conductive layer 17. In this case, even if a plurality of sheet pieces 19 of this example are overlapped, the insulating layer 18 of the lower sheet piece 19 insulates the overlapping conductive layers 17, so that they are electrically discontinuous. can maintain its condition.

<Effect>
A comparative experiment was conducted to demonstrate the effects of the present invention. The electromagnetic wave transmission sheet 1 having the configuration shown in FIGS. 7B and 9 and the conventional electromagnetic wave transmission sheet 1 (the specifications other than the structure of the second conductive layer 13 are the same) are 10W and 2.45GHz. Microwaves were input to each sample, and the power (W) that could be obtained by the coupler 20 was measured. At this time, the surface of the electromagnetic wave transmission sheet 1 was virtually divided into 4×6=24 blocks, and measurements were taken at representative points of each block. Note that the power feeding port 16 was installed in the upper left cell (0,0). In this case, since the coupler 20 cannot be installed in the cell (0,0) (because it will interfere with the power feeding port 16), power (W) is not measured in the cell (0,0).

FIG. 14 shows the results of an experiment using a conventional electromagnetic wave transmission sheet 1, that is, an electromagnetic wave transmission sheet 1 in which an electrically continuous mesh pattern is formed over the entire surface of the sheet. The mesh pattern had a meander shape as shown in FIG. 2, the pitch P was about 8 mm, and the line width W was about 1 mm. In this case, the maximum value of the output was approximately 1 (W), the minimum value was approximately 0.2 (W), the average was 0.522 (W), and the variance was 0.037.

FIG. 15 shows the experimental results when using the electromagnetic wave transmission sheet 1 having the configuration shown in FIGS. 7B and 9, that is, the electromagnetic wave transmission sheet 1 created by combining a plurality of conductive layers that are electrically insulated from each other. be. A meander-shaped mesh pattern shown in FIG. 2 was formed in each conductive layer, and the pitch P was about 8 mm and the line width W was about 1 mm. Further, each conductive layer was overlapped with a width dy of approximately 2.5P (approximately 20 mm) at each end in the Y direction. In this case, the maximum value of the output was approximately 0.65 (W), the minimum value was approximately 0.2 (W), the average was 0.363 (W), and the variance was 0.015.

Comparing the two, in the conventional electromagnetic wave transmission sheet 1 in which an electrically continuous mesh pattern is formed over the entire surface of the sheet, the variation in power depending on the receiving position on the sheet is relatively large. On the other hand, in the electromagnetic wave transmission sheet 1 created by combining a plurality of conductive layers that are electrically insulated from each other, dispersion of received power is significantly suppressed. This proves that according to the present invention, it is possible to reduce output dispersion due to differences in reception positions on the sheet.

(Other embodiments)
Note that the present invention is not limited to the embodiments described above. That is, those skilled in the art may make various changes, combinations, subcombinations, and substitutions with respect to the components of the above-described embodiments within the technical scope of the present invention or its equivalent scope. For example, all electromagnetic wave transmission sheets 1 including the second conductive layer 13 formed by appropriately combining the components of Examples 1 to 3 are included in the technical scope of the present invention.

1 Electromagnetic wave transmission sheet 11 Dielectric layer 11S Front surface 11R Back surface 11E End portion 12 First conductive layer 13 Second conductive layer 14 Third conductive layer 15 Protective layer 15A Protective layer 15B Protective layer 16 Power supply port 165 Insulator 161 First Power supply body 162 Second power supply body 163 First power supply plate 164 Second power supply plate 17 Conductive layer 17E End portion 18 Protective layer 19 Sheet piece 20 Coupler 21 Housing 22 Dielectric body 23 Internal electrode 30 Equipment L1 Cable

Claims (1)

a dielectric layer;
a first conductive layer covering the back surface of the dielectric layer;
a second conductive layer covering the surface of the dielectric layer,
The second conductive layer is
It includes a plurality of sheet pieces laminated with a conductive layer having a mesh-like wiring pattern and a protective layer made of an insulator,
An electromagnetic wave transmission sheet in which at least a portion of an end of the sheet piece overlaps another sheet piece.

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