JP2010252121A - Electromagnetic wave interface apparatus and communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic wave interface apparatus which performs transmission/reception with a sheet-like electromagnetic wave transfer medium, the electromagnetic wave interface apparatus performing communication over wider bands than prior art. <P>SOLUTION: The electromagnetic wave interface apparatus 200 inputs/outputs electromagnetic waves from/to a sheet-like electromagnetic wave transfer medium 120, including a mesh-like conductor layer. A first conductor plate 202A is disposed in proximity to and approximately in parallel with a side of the mesh-like conductor layer. A second conductor plate 202B is disposed, approximately in parallel away from an upper surface of the first conductor plate perpendicularly. In a view in a perpendicular direction with respect to the mesh-like conductor layer, at least a part of a confronted portion between an outer edge of the first conductor plate 202A and an outer edge of the second conductor plate 202B is tapered. A transmission line 208 extends from the outer edge of the first conductor plate 202A, to under the second conductor plate 202B, and a feed point 204 to the conductor plates is disposed between the transmission line and the second conductor plate 202B. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electromagnetic wave interface device that performs transmission and reception with a sheet-like electromagnetic wave transmission medium.

  Conventionally, an electromagnetic field is present in a region between the conductive sheet bodies facing each other, the voltage between the two conductive sheet bodies is changed to change the electromagnetic field, or the change of the electromagnetic field causes the conductive sheet body to change. There has been proposed a technique for performing electromagnetic wave transmission by changing the voltage between them to advance an electromagnetic field in a desired direction. Further, Non-Patent Document 1 introduces an electromagnetic wave interface device that performs signal transmission / reception and electric power receiving and feeding by electromagnetic wave transmission. Patent Document 1 discloses a two-dimensional interface device including a second conductor plate having a cylindrical plate shape with a lid that covers a first conductor plate having a disk shape.

JP 2007-82178 A

Hiroyuki Shinoda et al., "Simultaneous signal and power transmission method using surface microwaves (theory and general support for ubiquitous sensor networks)", IEICE Technical Report Vol.107, No.53 (20070517 ) pp. 115-118

  The conventional two-dimensional interface device disclosed in Patent Document 1 performs communication by causing resonance at a specific frequency and has a relatively narrow frequency band. For this reason, the two-dimensional interface device cannot be used in communications using a relatively wide frequency band such as UWB (ultra-wide band radio), which is expected to become popular in the future.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an electromagnetic wave interface device having a relatively wide frequency band without causing resonance only in a specific frequency band.

  An embodiment of the present invention is an electromagnetic wave interface device that inputs and outputs electromagnetic waves with a sheet-like electromagnetic wave transmission medium having a mesh-like conductor layer. The apparatus includes a first conductor plate disposed substantially parallel to the mesh conductor layer side and a second conductor disposed substantially parallel to the upper surface of the first conductor plate in the vertical direction. A body plate. When viewed from the vertical direction with respect to the mesh-like conductor layer, at least a part of a portion where the outer edge of the first conductor plate and the outer edge of the second conductor plate face each other has a tapered shape, and the first conductor plate A transmission path extends from the outer edge of the second conductor plate to the lower side of the second conductor plate, and a feeding point to the conductor plate is disposed between the transmission path and the second conductor plate.

  According to this aspect, a wideband electromagnetic wave interface device can be realized by forming the tapered structure used in the conventional planar antenna with two conductor plates arranged so as to have a step. . Moreover, electromagnetic wave leakage into the air can be suppressed by adopting a configuration in which the feeding point on the transmission path is covered with one conductor plate.

  When viewed from the vertical direction with respect to the mesh-like conductor layer, a part of the first conductor plate and the second conductor plate may overlap each other, or the first conductor plate and the second conductor plate may be overlapped. There may be no overlapping parts.

  A dielectric may be disposed between the first conductor plate and the second conductor plate, or a space may be provided between the two.

  At least one of the first conductor plate and the second conductor plate may have a curved outer edge portion forming a tapered shape. Preferably, at least one of the first conductor plate and the second conductor plate is circular or elliptical.

  Another aspect of the present invention is an electromagnetic wave interface device. This device is an electromagnetic wave interface device for inputting / outputting electromagnetic waves to / from a sheet-like electromagnetic wave transmission medium having a mesh-like conductor layer, and is arranged in a substantially parallel manner close to the mesh-like conductor layer side. A conductor plate; and a second conductor plate disposed substantially in parallel and spaced apart from the top surface of the first conductor plate in the vertical direction. When viewed from the vertical direction with respect to the mesh-like conductor layer, at least a part of the outer edge of the first conductor plate and the outer edge of the second conductor plate face each other in a tapered shape, and the first conductor plate and A part of the second conductor plate overlaps, and a feeding point to the conductor plate is arranged in the overlapping portion.

  According to this aspect, since the feeding point is covered with one of the conductor plates, relatively broadband communication is possible due to the tapered structure of the two conductor plates while suppressing electromagnetic wave leakage into the air.

  Still another embodiment of the present invention is a communication device that performs communication using a sheet-like electromagnetic wave transmission medium, including the electromagnetic wave interface device having the above-described configuration, and the dielectric is part of a casing of the communication device. Incorporated. According to this aspect, it is not necessary to carry the electromagnetic wave interface device separately from the communication device, and if the dielectric is used as a lid of the communication device, the electromagnetic wave interface device can be easily replaced.

  ADVANTAGE OF THE INVENTION According to this invention, in the electromagnetic wave interface apparatus which transmits / receives between sheet-like electromagnetic wave transmission media, communication in a wider band than before is attained.

It is a top view of an electromagnetic wave communication medium. It is sectional drawing of a perpendicular direction with respect to the top view of FIG. (A) is a top view of the electromagnetic wave communication medium which formed the electrode in the taper structure, (b) is sectional drawing along A-A 'of (a). It is each parameter of the electromagnetic wave interface apparatus used for experiment. It is each parameter of the communication sheet used for the experiment. It is a graph which shows the measurement result of VSWR of the electromagnetic wave interface apparatus of FIG. It is a graph which shows the measurement result of the leakage electromagnetic wave of the electromagnetic wave interface apparatus of FIG. (A) is a top view of the electromagnetic wave interface apparatus which concerns on one Embodiment of this invention, (b) is sectional drawing along B-B 'of (a). (A) is a top view of the electromagnetic wave interface apparatus which concerns on another embodiment of this invention, (b) is sectional drawing along C-C 'of (a). It is each parameter of the electromagnetic wave interface apparatus used for experiment. It is a graph which shows the measurement result of VSWR of the electromagnetic wave interface apparatus of FIG. It is a graph which shows the measurement result of the leakage electromagnetic wave of the electromagnetic wave interface apparatus of FIG. (A)-(c) is a figure which shows the modification of a conductor board shape.

  Embodiments of the present invention will be described below. In addition, embodiment described below is an illustration, Comprising: It is not limited to this and does not restrict | limit the scope of the present invention.

  Also, in the following description, in order to facilitate explanation and understanding, what is a conductor in an electromagnetic wave frequency band used for electromagnetic wave transmission is called a “conductor”, and what is a dielectric in the frequency band. Called “dielectric”. Therefore, it is not directly restricted by, for example, whether it is a conductor, a semiconductor, or an insulator with respect to a direct current. In addition, the conductor and the dielectric are defined by their characteristics in relation to the electromagnetic wave, and do not limit the aspect or constituent material such as whether it is solid, liquid or gas. .

  FIG. 1 and FIG. 2 are diagrams for explaining the outline of the electromagnetic wave communication medium 120. FIG. 1 is a plan view of the electromagnetic wave communication medium 120, and FIG. 2 is a cross-sectional view in the vertical direction with respect to the plan view. As shown in FIGS. 1 and 2, the electromagnetic wave communication medium 120 includes a first protective layer 125 having a predetermined relative dielectric constant, a first conductor layer 121 having a substantially square mesh shape, a dielectric layer 122, a plate, The second conductive layer 123 and the second protective layer 124 are sequentially provided. Each layer has a two-dimensionally constant spread.

  The dielectric layer 122 is preferably a member having a certain degree of strength, flexibility, lightness, and beauty. In the case where a transparent dielectric material is interposed as the dielectric layer 122 between the first conductor layer 121 and the second conductor layer 123, the second conductive layer is formed through the substantially square opening of the first conductor layer 121. The body layer 123 can be seen through. However, when an opaque dielectric material is interposed as the dielectric layer 122 between the first conductive layer 121 and the second conductive layer 123, the second conductive layer is opened through the mesh opening of the first conductive layer 121. The conductor layer 123 is not visible. Here, as the opaque dielectric material used for the dielectric layer 122, for example, a flexible resin member or the like may be used. Further, as the dielectric layer 122, a sheet-like or belt-like cloth, paper, rubber, foam, gel material, or the like can be used.

  The electromagnetic wave communication medium 120 as a whole is configured in a planar shape having a constant spread in two dimensions. An electromagnetic wave is input to the electromagnetic wave communication medium 120 from the position of the circle 310 in FIG. 2, and the electromagnetic wave communication medium 120 can transmit the electromagnetic wave in a desired direction or by diffusing the electromagnetic wave. In the present specification, the term “planar” refers to a band, sheet, cloth, paper, foil, plate, film, film, mesh, etc., having a broad surface and thickness. Means thin. Hereinafter, the electromagnetic wave communication medium is simply referred to as a “communication sheet”.

  As shown in FIG. 2, various electromagnetic wave interface devices 100 and 200 described later are placed on the communication sheet 120. When the electromagnetic wave is propagating through the dielectric layer 122, the electromagnetic wave interface devices 100 and 200 are brought into capacitive coupling with the communication sheet 120 when the electromagnetic wave interface devices 100 and 200 are brought close to the mesh-like first conductor layer 121 side of the communication sheet 120. A part of the electromagnetic wave flowing through the dielectric layer 122 is sucked out between the mesh-shaped first conductor layer 121 and the electromagnetic wave interface devices 100 and 200.

  The efficiency with which the electromagnetic waves are sucked out depends on the length of the sides of the electromagnetic wave interface devices 100 and 200, the distance between the mesh-shaped first conductor layer 121 and the electromagnetic wave interface devices 100 and 200, and the dielectric constant of the first protective layer 125. Depends on.

  Conventionally, it is known that when a planar antenna is configured such that the electrode interval is tapered (hereinafter, this configuration is referred to as a “tapered structure”), the frequency band of the antenna becomes wide. In the present specification, the “tapered structure” refers to a structure having a shape in which the distance between the two electrodes of the antenna is not constant but gradually decreases toward a certain point between the outer edges of the electrodes. Since an antenna having such a planar taper structure is well known, detailed description thereof is omitted.

  FIG. 3 is an example in which electrodes are formed in a tapered structure in an electromagnetic wave interface device that inputs and outputs electromagnetic waves to and from the communication sheet 120, (a) is a plan view, and (b) is along AA ′. A cross-sectional view is shown. As shown in the figure, the electromagnetic wave interface device 50 includes two circular conductive plates 52 as electrodes, a thin rectangular parallelepiped dielectric 56 to which the conductive plate 52 is attached to the bottom surface, and electromagnetic waves on the conductive plate. And a feeding point 54 for inputting / outputting. The length of the short side of the dielectric 56 is greater than that of each conductor plate, and the length of the long side of the dielectric 56 is greater than the combined length of the two conductor plates. Since the two circular conductor plates 52 are arranged close to each other on the bottom surface of the dielectric 56, it can be seen that the outer edges of the conductor plates 52 form a taper from the vicinity of the feeding point 54 (FIG. (Indicated with an arrow).

  Here, the electromagnetic wave interface device 50 shown in FIG. 3 was prototyped, and a measurement experiment was performed to determine whether the frequency band would be wide. FIG. 4 shows parameters of the prototype electromagnetic wave interface device. Here, two circular plates having slightly different radii were used as the conductor plates. The distance between the conductor plates represents the distance at the closest point of the outer edges of the two conductor plates. FIG. 5 shows parameters of the communication sheet used in the experiment.

  A coaxial cable was connected to the electromagnetic wave interface device, and VSWR (voltage standing wave ratio) was measured in a state where the surface with the conductor plate was placed on the first conductor layer side of the communication sheet. The result is shown in FIG. In FIG. 6, the horizontal axis represents the frequency of the electromagnetic wave propagating in the communication sheet, and the vertical axis represents VSWR. From the result of FIG. 6, it can be seen that the VSWR is 3 or less at a frequency of 3 to 6 GHz, and communication in a very wide band is possible using the communication sheet and the electromagnetic wave interface device.

  Subsequently, leakage of electromagnetic waves from the electromagnetic wave interface device into the air was measured. For measurement, a 3D horizontal plane scanner DM3474AV1 / O manufactured by Device Co., Ltd. was used. A dipole antenna was installed 5 cm vertically above the communication sheet in a state where the surface with the conductor plate was placed on the first conductor layer side of the communication sheet. Then, the path loss between the electromagnetic wave interface device and the dipole antenna was measured. When the value of path loss is large, it means that electromagnetic wave leakage into the air is large.

  The dipole antenna element was pointed in the x direction (see 70 in FIG. 3), and the frequency of the electromagnetic wave propagating in the communication sheet was 4.1 GHz. The measurement result of the path loss at this time is shown in FIG. 7 corresponds to the position where the electromagnetic wave interface device is placed. In the figure, the dark portion at the center corresponds to −30 to −20 dB, and the outer side corresponds to −40 to −30 dB, and the value decreases as it goes outward. From this result, it can be seen that the electromagnetic wave is in a very strong state around the electromagnetic wave interface device. Measurements were taken with the electromagnetic wave frequency changed to several other values, but the results were similar.

  From the above measurement results, it was found that in the electromagnetic wave interface device in which the two conductive plates are arranged in a taper structure in the same plane, the electromagnetic wave leakage into the air is large although it has a wide band. Therefore, in the above configuration, electromagnetic waves cannot be input / output efficiently with respect to the communication sheet, and there are also problems in security, so there are many problems in practical use.

  The reason why the electromagnetic wave leaks from the electromagnetic wave interface device into the air is that the feeding point is exposed when viewed from vertically above the communication sheet. Therefore, if the feeding point is covered with a conductor, leakage of electromagnetic waves may be reduced.

  FIG. 8 shows a configuration of an electromagnetic wave interface device 100 that reduces leakage of electromagnetic waves according to an embodiment of the present invention. (A) is a top view, (b) shows sectional drawing along B-B '. As shown in the figure, the electromagnetic wave interface device 100 is the same as the electromagnetic wave interface device 50 of FIG. 3 in that it includes two circular conductor plates as electrodes, but the arrangement is different. The first conductor plate 102A is placed on the lower surface of the thin rectangular parallelepiped dielectric 106, that is, the side of the communication sheet 120 facing the first conductor layer. The second conductor plate 102B is placed on the upper surface of the dielectric 106, that is, the surface opposite to the first conductor plate 102A. The upper and lower surfaces of the dielectric 106 are configured to be substantially parallel to each other so that the first conductor plate 102A and the second conductor plate 102B are substantially parallel to the communication sheet 120. Similar to the example of FIG. 3, when viewed from vertically above, a tapered structure is formed by the outer edges of the first conductor plate 102A and the second conductor plate 102B. However, in the example of FIG. 3, the taper structure is formed in the same plane, but in the example of FIG. 8, the first conductor plate 102A and the second conductor plate 102B are arranged apart from each other in the vertical direction. Note that no taper structure is formed in the same plane.

  When viewed from above the communication sheet 120, the first conductive plate 102 </ b> A and the second conductive plate 102 </ b> B are arranged so as to overlap each other. A feeding point 104 for both conductor plates is arranged in this overlapping portion. That is, when viewed from above, the feeding point 104 is covered with the second conductor plate 102B. Thereby, in the electromagnetic wave interface device 100, electromagnetic wave leakage into the air can be suppressed.

  However, when the above-described measurement experiment was performed using the electromagnetic wave interface device 100, it was found that although the electromagnetic wave leakage was suppressed, the frequency band became narrower than the assumed value. This is because, as shown in FIG. 8, by overlapping the two conductive plates, the base portion of the taper structure (that is, the point where the circumference of the conductive plate intersects) is separated from the feeding point, and the overlapping portion This is thought to be due to capacitive coupling. However, by reducing the overlapping portion, it is possible to realize broadband communication as compared with the conventional electromagnetic wave interface device.

  FIG. 9 shows a configuration of an electromagnetic wave interface device 200 having a structure for suppressing capacitive coupling between conductor plates according to another embodiment of the present invention. (A) is a top view, (b) shows sectional drawing along C-C '. As shown in the figure, the electromagnetic wave interface device 200 is such that two circular conductor plates 202A and 202B are arranged in steps on the upper and lower surfaces of a dielectric 206 having a thin rectangular parallelepiped shape. 100. However, in this electromagnetic wave interface device 200, an elongated transmission path 208 extends from a part of the outer edge of the first conductor plate 202A to the lower side of the second conductor plate 202B, and between the transmission path 208 and the second conductor plate 202B. The feeding points 204 to both the conductor plates are arranged. The feeding point 204 is disposed so as to be covered at least partially, preferably entirely, by the second conductor plate 202B. As in the example of FIG. 8, when viewed from vertically above, a tapered structure is formed by the outer edges of the first conductor plate 202A and the second conductor plate 202B. The first conductor plate 202A and the second conductor plate 202B is spaced apart in the vertical direction.

  By comprising as mentioned above, the 2nd conductor board 202B comes to cover the feeding point 204. FIG. Therefore, the second conductor plate 202B has a function of preventing unnecessary radiation of electromagnetic waves from the feeding point 204 to the air. Furthermore, since the elongated transmission path 208 extends from the first conductor plate 202A to the lower side of the second conductor plate 202B, there is no region where the conductor plates overlap each other, or the region is made very small. Therefore, the occurrence of capacitive coupling can be suppressed, and thus broadband communication is possible.

  Here, an electromagnetic wave interface device 200 shown in FIG. 9 was made as a prototype, and a measurement experiment similar to the above was performed. FIG. 10 shows parameters of the prototype electromagnetic wave interface device 200. Here, two circular plates having slightly different radii were used as the conductor plates. The distance between the conductor plates represents the distance at the closest point of the outer edges of the two conductor plates. The interval of “−1 mm” indicates that the two conductive plates have a slightly overlapping portion.

  A coaxial cable was connected to the electromagnetic wave interface device, and VSWR (voltage standing wave ratio) was measured in a state where the surface with the conductor plate was placed on the first conductor layer side of the communication sheet. The result is shown in FIG. In FIG. 11, the horizontal axis represents the frequency of the electromagnetic wave propagating in the communication sheet, and the vertical axis represents VSWR. From the result of FIG. 11, it can be seen that VSWR is 3 or less at a frequency of 3 to 6.9 GHz, and that communication in a very wide band is possible using the communication sheet and the electromagnetic wave interface device.

  Subsequently, leakage of electromagnetic waves from the electromagnetic wave interface device into the air was measured. The measurement conditions are the same as in the example of FIG. The measurement results are shown in FIG. The center of the figure corresponds to the position where the interface device is placed. In the figure, the dark portion at the center corresponds to −30 to −20 dB, and the outer side corresponds to −40 to −30 dB, and the value decreases as it goes outward. From this result, it can be seen that the leakage electromagnetic wave into the air is greatly reduced as compared with that shown in FIG. 7, and an average reduction in leakage of about 5 dB is observed. Here, only the case where the frequency is 4.1 GHz is shown, but it has been confirmed that the leakage electromagnetic wave is similarly reduced even when the frequency is changed to some other value. Therefore, according to this embodiment, it is possible to realize broadband communication while reducing the amount of leaked electromagnetic waves from the electromagnetic wave interface device.

  Although the experiment was performed for the case where the first conductor plate and the second conductor plate slightly overlap each other, even if this overlap does not occur, the result is not greatly affected.

  Note that the width and length of the transmission path can take various values. The larger the width and length of the transmission line, the stronger the capacitive coupling with the second conductor plate, so it is preferable to make it as small as possible. Further, the end of the transmission line, that is, the feeding point needs to be covered with the second conductor plate. As this end approaches the center of the second conductor plate, that is, as the length of the transmission line from the outer edge of the first conductor plate increases, the leakage electromagnetic wave can be suppressed. There is a trade-off relationship that the band becomes smaller due to capacitive coupling. Therefore, it is preferable to select an appropriate transmission line width and length through experiments or simulations.

  Furthermore, in the example of FIG. 9, the transmission path extends on the line connecting the centers of the first conductor plate and the second conductor plate, in other words, from the closest part of both conductor plates. It is not limited. Also in this case, the taper structure collapses as the position of the transmission path deviates from the line connecting the centers of the two conductor plates. Therefore, in order to ensure a desired wide band, it is necessary to be accommodated to some extent.

  In addition, the transmission line extends horizontally from the outer edge of the first conductor plate, but as long as the feeding point is covered with the second conductor plate, the transmission line extends in the vertical direction and then bends in the horizontal direction. There may be.

  Note that when a terminal such as an SMA terminal is attached to the electromagnetic wave interface device, the terminal may be positioned almost directly above the feeding point. In this case, the feeding point may be covered with a terminal instead of the second conductor plate.

  As described above, according to this embodiment, the electromagnetic wave interface has a configuration in which two conductor plates have a configuration in which the outer edge forms a tapered structure and the feeding point is covered with one conductor plate. By creating a device, it is possible to realize two-dimensional communication with a wide band and less leakage of electromagnetic waves. Therefore, broadband communication such as UWB, which is difficult with the conventional two-dimensional communication system, is also possible.

  The tapered structure referred to in the present invention means that the outer edges of the two conductor plates appear to be tapered when observed from above or below the plane of the communication sheet. It should be noted that the second conductor plate is not in contact with or close to the same plane, and the taper is not formed in that plane. Unlike the known planar antenna, the present invention is characterized in that the conductor plates are on different planes.

  In the embodiment, a rectangular parallelepiped dielectric is located between the first conductor plate and the second conductor plate, and two conductor plates are respectively placed on the upper and lower surfaces of the dielectric. The air may be air without a dielectric between the conductor plates. For example, a shape in which a conductor plate is attached to both surfaces of a hollow flat case is conceivable.

  In the embodiment, the circular conductor plate has been described, but is not limited thereto. Any material can be used as long as the opposing outer edges of the conductor plate have a tapered structure, that is, a shape having a curved surface that gradually decreases. An example is shown in FIG. (A) shows the case where the two conductor plates are both elliptical. A tapered structure appears in the part indicated by the arrow in the figure. Further, both outer edges of the conductor plate need not be curved, as shown in (b), even if the outer edge of one conductor plate is a curve and the outer edge of the other conductor plate is a straight line. Good. Furthermore, as shown in (c), the conductor plate does not have to be a complete circle or ellipse, and may have a structure having a part of a curve of a circle or an ellipse at the outer edge. Further, there is no need for a taper structure on both sides of the feeding point, and only one side may be provided. Furthermore, even when the outer edges of the two conductor plates are straight and have a V shape, broadband communication may be realized.

  Further, the two conductor plates need not be the same size, and may be different.

  In the embodiment, it has been described that the two conductor plates have a tapered structure. However, the electromagnetic wave does not have a taper structure, and when the first conductor plate and the second conductor plate are partially overlapped when viewed from the vertical direction, the feeding point to the conductor plate is disposed in the overlapping portion. It is also possible to create an interface device. In this case, even if a wide band cannot be realized, two-dimensional communication with little leakage of electromagnetic waves from the feeding point can be realized.

In the embodiment, the electromagnetic wave interface device as a single unit placed on the communication sheet has been described. This apparatus is connected to known communication devices such as a personal computer, a communication modem, and a production LAN access point by a coaxial cable or the like, and has a role of connecting these communication devices and a communication sheet so that they can communicate or supply power.
Alternatively, the electromagnetic wave interface device may be attached to the bottom surface of the communication device. By doing so, it is not necessary to carry the electromagnetic wave interface device separately from the communication device, and convenience is increased, for example, it is not necessary to prepare a connection cable or the like separately.

  Or you may incorporate the electromagnetic wave interface apparatus in the housing | casing of a communication apparatus previously. For example, a part or all of the bottom surface of the housing of the communication device is made of a dielectric, a first conductor plate is disposed on the surface of the dielectric portion that contacts the communication sheet, and the second conductor is disposed on the opposite surface. A plate may be arranged. The dielectric part on the bottom surface of the housing may be removable, and this part may be an electromagnetic wave interface device. The dielectric portion may serve as a lid for a battery housing portion of the communication device. Accordingly, it is not necessary to carry the electromagnetic wave interface device separately from the communication device, and the electromagnetic wave interface device can be easily replaced.

  The electromagnetic wave interface device and the electromagnetic wave transmission medium according to the present invention are not limited to the description in the above-described embodiments and the like. It is easily understood by those skilled in the art that it can be used. Moreover, it does not prevent any other members from being appropriately included and interposed between the members used in the description of the above-described embodiment.

  50 Electromagnetic Interface Device, 52 Conductor Plate, 54 Feed Point, 56 Dielectric, 100 Electromagnetic Interface Device, 102A First Conductor Plate, 102B Second Conductor Plate, 104 Feed Point, 106 Dielectric, 120 Electromagnetic Communication Medium ( Communication sheet), 200 electromagnetic wave interface device, 202A first conductor plate, 202B second conductor plate, 204 feeding point, 206 dielectric, 208 transmission line.

Claims (9)

An electromagnetic wave interface device for inputting / outputting electromagnetic waves to / from a sheet-like electromagnetic wave transmission medium having a mesh-like conductor layer,
A first conductor plate disposed in parallel and close to the mesh conductor layer side;
A second conductor plate disposed substantially parallel to and spaced apart from the upper surface of the first conductor plate in the vertical direction;
When viewed from the vertical direction with respect to the mesh-like conductor layer, at least a part of the facing portion of the outer edge of the first conductor plate and the outer edge of the second conductor plate has a tapered shape,
A transmission path extends from an outer edge of the first conductor plate to the lower side of the second conductor plate, and a feeding point to the conductor plate is disposed between the transmission path and the second conductor plate. Electromagnetic wave interface device.   2. The electromagnetic wave interface device according to claim 1, wherein when viewed from a vertical direction with respect to the mesh-like conductor layer, a part of the first conductor plate and the second conductor plate overlap each other.   2. The electromagnetic wave interface device according to claim 1, wherein the first conductor plate and the second conductor plate do not overlap each other when viewed from a vertical direction with respect to the mesh-like conductor layer.   4. The electromagnetic wave interface device according to claim 1, wherein a dielectric is disposed between the first conductor plate and the second conductor plate.   5. The electromagnetic wave interface device according to claim 1, wherein at least one of the first conductor plate and the second conductor plate has a curved outer edge portion constituting a tapered shape. 6.   6. The electromagnetic wave interface device according to claim 5, wherein at least one of the first conductor plate and the second conductor plate is circular or elliptical. An electromagnetic wave interface device for inputting / outputting electromagnetic waves to / from a sheet-like electromagnetic wave transmission medium having a mesh-like conductor layer,
A first conductor plate disposed in parallel and close to the mesh conductor layer side;
A second conductor plate disposed substantially parallel to and spaced apart from the upper surface of the first conductor plate in the vertical direction;
When viewed from the vertical direction with respect to the mesh-like conductor layer, at least a part of a portion where the outer edge of the first conductor plate and the outer edge of the second conductor plate face each other has a tapered shape, and the first conductor plate has a tapered shape. An electromagnetic wave interface device, wherein a part of a conductor plate and a part of the second conductor plate overlap each other, and a feeding point to the conductor plate is arranged in the overlapping part. A communication device including the electromagnetic wave interface device according to claim 1 for performing communication using the sheet-like electromagnetic wave transmission medium,
A communication device, wherein the dielectric is incorporated as a part of a casing of the communication device. An electromagnetic wave interface device for inputting / outputting electromagnetic waves to / from a sheet-like electromagnetic wave transmission medium having a mesh-like conductor layer,
A first conductor plate disposed in parallel and close to the mesh conductor layer side;
A second conductor plate disposed substantially parallel to and spaced apart from the upper surface of the first conductor plate in the vertical direction;
When viewed from the vertical direction with respect to the mesh-like conductor layer, a part of the first conductor plate and the second conductor plate overlap each other, and a feeding point to the conductor plate is arranged in the overlapping portion. An electromagnetic wave interface device characterized by.