JP2007281678A - Signal transmission system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a signal transmission system wherein sheet-like signal transmission apparatuses are combined. <P>SOLUTION: Each of first and second signal transmission apparatuses 101 includes a mesh-like first conductor unit 111 and sheet-like second conductor units 121, and a signal is transmitted by changing an electromagnetic field in a space region 131 and an extended region 141. The first conductor unit 111 of the first signal transmission apparatus 101 and the first conductor unit 111 of the second signal transmission apparatus 101 are opposed to each other and the extended regions 141 of the both are overlapped so that the signal can be transmitted between a communication apparatus coupled to the first signal transmission apparatus 101 and a communication apparatus coupled to the second signal transmission apparatus 101, and a distance between the first conductor unit 111 and the second conductor units 121 is sufficiently shorter than the electromagnetic wavelength associated with the electromagnetic field. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a signal that combines a signal transmission device that transmits a signal by changing an electromagnetic field in a gap region sandwiched between a mesh-like conductor portion and a sheet-like conductor portion and a leaching region on the outer side of the mesh-like conductor portion. Relates to the transmission system.

Conventionally, a sheet shape in which a plurality of communication elements are embedded (a cloth shape, a paper shape, a foil shape, a plate shape, a film shape, a film shape, a mesh shape, etc., having a wide surface and a small thickness). The technology relating to the communication device has been proposed by the inventors of the present application. For example, in the following documents, a communication in which a plurality of communication elements embedded in a sheet-like member (hereinafter referred to as “sheet-like body”) transmits signals by relaying signals without forming individual wirings. A device has been proposed.
Japanese Patent Laid-Open No. 2004-007448

  Here, in the technique disclosed in [Patent Document 1], each communication element is arranged at the apex of a lattice-like, triangular, or honeycomb-like figure on the surface of the sheet-like body. Each communication element communicates only with other communication elements arranged in the vicinity by utilizing the fact that the potential change generated by the communication element is strong in the vicinity and attenuated and propagated in the distance.

  By sequentially transmitting the signals between the communication elements by this local communication, the signals are transmitted to the target communication element. The plurality of communication elements are divided into hierarchies by the management function, and route data is set in each hierarchy, so that signals can be efficiently transmitted to the final target communication element.

  On the other hand, according to the inventors' research, there is an electromagnetic field in a narrow region sandwiched between sheet-like bodies facing each other, and the electromagnetic field is changed by changing the voltage between the two sheet-like bodies. A technology has been developed in which the voltage between the sheet-like bodies is changed by the change, the electromagnetic field is advanced, and communication is performed.

  In order to detect the voltage between two sheet-like bodies, it has been common to directly connect a communication device to both of them or provide a connector on the sheet-like body and connect it to the communication device.

  However, if such a wired connection is not performed as much as possible and an external communication device is brought close to the sheet-like body so that a signal can be transmitted, it is easy for the user to use and maintenance efficiency is improved.

  Therefore, there is a strong demand for new technologies to meet such demands.

  The present invention responds to such demands by changing the electromagnetic field in the narrow area sandwiched between the mesh-like conductor part and the sheet-like conductor part and the leaching area outside the mesh-like conductor part. It is an object of the present invention to provide a signal transmission system that combines signal transmission devices for transmission.

  In order to achieve the above object, the following invention is disclosed in accordance with the principle of the present invention.

  A signal transmission system according to a first aspect of the present invention includes a sheet-like first signal transmission device that transmits a signal by a change in an electromagnetic field, and a second signal transmission device, and is configured as follows. .

That is, the first signal transmission device and the second signal transmission device are respectively: (a) a mesh-shaped first conductor portion that is a conductor in the frequency band of the electromagnetic field;
(B) substantially parallel to the first conductor portion and spaced apart by an interval sufficiently shorter than the wavelength in the frequency band of the electromagnetic field, and the outer shape which is a conductor in the frequency band of the electromagnetic field has a flat plate-like shape. 2 conductor parts,
Is provided.

Further, the first signal transmission device and the second signal transmission device are respectively (c) a narrow region sandwiched between the outer shape of the first conductor portion and the outer shape of the second conductor portion, and the first conductor In the plate-shaped leaching region located on the opposite side across the outer region of the gap portion, the electromagnetic field is transmitted in the frequency band,
(D) Of the intensity of the electromagnetic field in the leaching region, the intensity of the traveling wave component affected by the mesh shape is configured to attenuate exponentially with the distance from the outer shape of the first conductor portion.

Then, the first signal transmission device and the second signal transmission device are arranged such that the leaching areas of the first signal transmission device and the second signal transmission device overlap, and the first signal transmission device and the second signal transmission device are arranged. In each of the devices
(E) The change of the electromagnetic field in the narrow area and the leaching area is transmitted to the counterpart signal transmission device arranged in the leaching area, or from the counterpart signal transmission apparatus to the narrow area and the leaching area. A change in the electromagnetic field is transmitted, and a signal is transmitted by changing the voltage between the first conductor portion and the second conductor portion.

In the signal transmission system of the present invention, at least one of the first signal transmission device and the second signal transmission device is:
(F) A communication device is wired to the first conductor portion and the second conductor portion,
(G) Transmitting the voltage between the first conductor part and the second conductor part, which changes together with the electromagnetic field in the gap area and the leaching area, to the communication apparatus, or from the communication apparatus, the first A signal can be transmitted by changing the voltage between the conductor portion and the second conductor portion to change the electromagnetic field in the gap region and the leaching region.

  In addition, in at least one of the first signal transmission device and the second signal transmission device of the signal transmission system of the present invention, the unit length of repetition of the mesh shape is in the frequency band of the electromagnetic field. It is sufficiently shorter than the wavelength, and the thickness of the leaching region can be configured to be equal to or less than the repeating unit length.

  Moreover, in at least one of the first signal transmission device and the second signal transmission device of the signal transmission system of the present invention, the average width of the mesh-shaped mesh size is the electromagnetic field. It can be configured to be sufficiently shorter than the wavelength in the frequency band, and the thickness of the leaching region is not more than the repeating unit length.

  Further, in at least one of the first signal transmission device and the second signal transmission device of the signal transmission system of the present invention, the mesh shape is a mesh shape in which polygons having the same shape are repeated. The unit length of the repetition is sufficiently shorter than the wavelength in the frequency band of the electromagnetic field, and the intensity of the traveling wave component affected by the mesh shape of the electromagnetic field in the leaching region is determined from the outer shape of the first conductor portion. It can be configured to decay exponentially with respect to the distance to the leaching region or to decay faster.

  Further, in at least one of the first signal transmission device and the second signal transmission device of the signal transmission system of the present invention, the mesh shape is a mesh shape in which a plurality of circular holes are provided on a flat plate. The center distance between the circular holes is sufficiently shorter than the wavelength in the frequency band of the electromagnetic field, and the intensity of the traveling wave component affected by the mesh shape of the electromagnetic field in the leaching region is It can be configured to attenuate exponentially with respect to the distance from the outer shape to the leaching region, or to attenuate faster than this.

  Further, in at least one of the first signal transmission device and the second signal transmission device of the signal transmission system of the present invention, the second conductor portion has a mesh shape, and the second conductor portion Can be configured to further transmit the electromagnetic field in the frequency band in the opposing region of the flat plate shape located on the opposite side across the gap region.

  Further, in at least one of the first signal transmission device and the second signal transmission device of the signal transmission system of the present invention, the first conductor portion is changed to a mesh shape, and a stripe is used. It can comprise so that it may become a shape.

  According to the present invention, a signal transmission device for transmitting a signal by changing an electromagnetic field in a gap region sandwiched between a mesh-like conductor portion and a sheet-like conductor portion and a leaching region outside the mesh-like conductor portion is combined. A signal transmission system can be provided.

  Embodiments of the present invention will be described below. The embodiments described below are for explanation, and do not limit the scope of the present invention. Therefore, those skilled in the art can employ embodiments in which each of these elements or all of the elements are replaced with equivalent ones, and these embodiments are also included in the scope of the present invention.

  In the following, in the present embodiment, the signal transmission system is configured by arranging two signal transmission devices at predetermined positions, but the structure of the signal transmission device itself has many common points. First, the configuration of the signal transmission device alone will be described.

  Next, an interface device for acquiring a signal or sending a signal in the vicinity of the signal transmission device will be described in order. One feature of the present invention is that another signal transmission device itself can be used as the interface device.

  In the following, in order to facilitate understanding, what is a conductor in the frequency band of the electromagnetic wave used for signal transmission is referred to as “conductor”, and what is a dielectric in the frequency band is referred to as “dielectric”. . Therefore, for example, what is an insulator against a direct current may be referred to as a “conductor”.

(Signal transmission device)
FIG. 1 is an explanatory diagram showing a schematic configuration of the signal transmission device according to the present embodiment. Hereinafter, a description will be given with reference to FIG.

  This figure (b) is sectional drawing of the signal transmission apparatus 101 which concerns on this embodiment. As shown in the figure, the signal transmission device 101 includes a mesh-like first conductor portion 111 and a flat plate-like second conductor portion 121 substantially parallel to the first conductor portion 111.

  Here, a region sandwiched between the first conductor portion 111 and the second conductor portion 121 is a narrow space region 131, and a region on the upper side of the first conductor portion 111 in this drawing is a leaching region 141.

  This figure (a) is a top view of the signal transmission device 101. The first conductor portion 111 of this embodiment has a square mesh shape, and the second conductor portion 121 can be seen through the square.

  Further, the repeating unit of the mesh is equal to the distance between the centers of the squares adjacent to each other, which is substantially equal to the length of one side of the square.

  In this embodiment, the gap region 131 and the leaching region 141 are both air, but either one or both or part of them is made of various dielectrics, water or earth, or vacuum. May be.

  In particular, in order to prevent a standing wave from occurring in the gap region 131, it is desirable to dispose or fill the gap region 131 with a material having a large dielectric loss or resistance loss in the signal frequency band.

  The outer shapes of the first conductor portion 111 and the second conductor portion 121 are all sheet-like (cloth-like, paper-like, foil-like, plate-like, film-like, film-like, mesh-like, etc.). , The thickness is thin.)

  Therefore, for example, when the wall of the room is used as the signal transmission device of the present embodiment, first, a metal foil is pasted as the second conductor portion 121, and then an insulator is sprayed, and then the first conductor portion 111 is a metal. Paste the net, and then paste the insulator wallpaper.

  In addition, the first conductor portion 111 and the second conductor portion 121 can be configured by using conductive ink or conductive rubber and painting or spraying them while drawing a pattern as necessary. .

  Now, in this way, in the signal transmission device 101, attention is paid to the electromagnetic wave mode propagating between the narrow regions 131 sandwiched between the first conductor portion 111 and the second conductor portion 121.

  If the first conductor 111 is not a mesh and has a structure without a foil-like opening, the electromagnetic wave is completely confined in the narrow space 131.

  However, the first conductor portion 111 has a mesh-like structure and has an opening. With such a shape, the electromagnetic field oozes to a height that is about the same as the mesh interval. A region where the electromagnetic wave oozes out is a leaching region 141.

  The repeating unit dimension of the mesh needs to be sufficiently shorter than the electromagnetic wave length. Typically, sizes of λ / 5 or less, λ / 10 to λ / 100, λ / 100 to λ / 1000, etc. can be used for the electromagnetic wave length λ. Depending on the size, the size can be changed as appropriate. Further, an experiment may be performed by combining actual materials, and the leaching region 141 may be set to a desired height (thickness) so that a desired electromagnetic wave intensity can be obtained.

  The height (thickness) of the leaching region 141 is approximately the same as the mesh repeating unit. Actually, the intensity of the electromagnetic wave attenuates exponentially according to the distance from the surface of the first conductor portion 111.

  In addition, the height (thickness) of the gap region 131 needs to be on the same order as the repeating unit of the mesh and sufficiently smaller than the electromagnetic wave length.

  If two signal transmission devices 101 are prepared and arranged so that the leaching regions 141 overlap each other, signals can be transmitted between the two signal transmission devices 101 via an electromagnetic field.

  For example, one signal transmission device 101 is pasted on a wall surface as a wallpaper for a room, and the other signal transmission device 101 is used as a kind of interface device or connector for performing signal transmission via this “wallpaper”. Is possible.

  In this case, the intervals and shapes of the meshes may be different from each other or may be the same.

  In addition, the first interface device or communication device is connected to one signal transmission device 101 by wired coupling or proximity coupling, and the second interface device or communication device is wired to or coupled to the other signal transmission device 101. By connecting by coupling and overlapping the leaching areas 141 of the two signal transmission devices 101, signals can be transmitted between the first interface device or communication device and the second interface device or communication device. It becomes possible. The signal transmission device 101 itself can also be viewed as an interface device that can be connected to proximity coupling.

  Below, the example of the specific shape of the 1st and 2nd signal transmission apparatus 101 and the experimental result of the signal transmission performance regarding these are demonstrated.

  FIG. 2 is an explanatory diagram illustrating a schematic configuration according to the embodiment of the first signal transmission device 101. Hereinafter, a description will be given with reference to FIG.

  As shown in the top view of this figure (a), and the cross-sectional view of this figure (b), the mesh of the first signal transmission device 101 is a substantially square of 14 mm, and the first conductor portion between the meshes. 111 has a width of 1 mm and is formed of a copper foil having a thickness of 35 μm. The second conductor part 121 is also formed of a copper foil having a thickness of 35 μm, and the gap region 131 is filled with a glass epoxy material (FR4) at an interval of 1.6 mm. Further, vinyl chloride having a thickness of 0.2 mm is attached as the protective sheet 181 to the upper surface of the first conductor portion 111.

  The 1st signal transmission apparatus 101 shown to this figure is an example of a form arrange | positioned as a communication sheet on a wall surface.

  FIG. 3 is an explanatory diagram showing a schematic configuration according to an embodiment of the second signal transmission device 101 ′. Hereinafter, a description will be given with reference to FIG.

  As shown in the figure, the mesh of the second signal transmission device 101 ′ is a 10 mm-large approximately square, the width of the first conductor 111 ′ between the meshes is 1 mm, and the thickness of the copper foil is 35 μm. It is formed with. The overall size is about 80 mm × 112 mm.

  On the other hand, the second conductor portion 121 ′ is also formed of a copper foil having a thickness of 35 μm, the gap region 131 ′ is 1.6 mm thick, and is filled with a glass epoxy material (FR4).

  The end portion of the first conductor portion 111 ′ and the second conductor portion 121 ′ are connected to the 50Ω coaxial cable 183 via the SMA connector 182, and can be connected to an external communication device. (In the first signal transmission device 101, the same end processing is performed and a coaxial cable is connected.)

  2nd signal transmission apparatus 101 'shown to this figure is an example of the form utilized as an interface apparatus used as an interface with an external communication apparatus.

  In these forms, a sheet-like insulator that covers the outside of the first conductor portion 111 and the second conductor portion 121 may be attached to form a cover.

  FIG. 4 is an explanatory diagram showing the arrangement of the first signal transmission device 101 shown in FIG. 2 and the second signal transmission device 101 ′ shown in FIG. Hereinafter, a description will be given with reference to FIG.

  As shown in this figure, the signal transmission device 101 ′ is in close contact with the protective sheet 181 of the signal transmission device 101, the first conductor portion 111 and the first conductor portion 111 ′ face each other, and the leaching areas 141 overlap each other. Are arranged as follows.

  The signal transmission device 101 ′ is arranged at a position 150 mm apart from the corner of the signal transmission device 101 that is sufficiently large with respect to the signal transmission device 101 ′, and the network analyzer 184 is connected via the coaxial cable 183 with this as a reference position. Connected between the two, the frequency was changed between 1 GHz and 5 GHz, and the received voltage when a signal of 1 V amplitude was input was measured.

  FIG. 5 is a graph showing a state of reception intensity for each frequency at the reference position. Hereinafter, a description will be given with reference to FIG.

In this graph, the horizontal axis represents the frequency (the position displayed by black triangles in the figure, 2.0GHz, position displayed in white triangle, 2.4GHz and 3.0 GHz), and the vertical axis indicates the reception strength S ₁₂ In dB.

  As for the reception intensity, a signal having a sufficient intensity of about −20 dB to −40 dB is observed in a wide frequency band, and it can be seen that the signal transmission system can be applied to the 2.4 GHz band, for example.

  FIG. 6 is a graph showing the reception intensity when the relative position of the signal transmission device is shifted from the reference position in the 2.4 GHz band. Hereinafter, a description will be given with reference to FIG.

The horizontal axis is the distance traveled when the signal transmission device 101 'has moved downward in FIG. 4, the vertical axis is shown the reception strength S ₁₂ in dB.

  As can be seen from this graph, even when the relative positional relationship is changed, a signal with a sufficient intensity of about −20 dB to −30 dB is observed, and both are close to an arbitrary position. It can be seen that a signal transmission system capable of transmitting a signal can be realized simply by making it.

  In the above embodiment, the second conductor portion 121 is a foil-like conductor without an opening, but the second conductor portion 121 may be a mesh shape similar to the first conductor portion 111. FIG. 7 is a cross-sectional view of such a configuration.

  As shown in this figure, there is a counter area 151 corresponding to the leaching area 141 on the outside of the second conductor portion 121, and electromagnetic waves ooze out here. Therefore, since electromagnetic waves are leached on both the front surface and the back surface, signals can be transmitted and received by placing an arbitrary interface device (or other signal transmission device 101) close to either surface. .

Now, the theoretical background of the leaching region 141 will be briefly described below. In the signal transmission device 101 configured as described above, the electromagnetic wave that travels without “radiating” the electromagnetic wave to the outside of the signal transmission device 101 in the gap region 131 (and the leaching region 141 and the opposing region 151 in the vicinity thereof). Mode φ _n exists.

  Here, the height L of the near field where the electromagnetic field of the same degree as the gap region 131 oozes out and there is no electromagnetic radiation in the distance is L = d / where the unit length of the mesh repetition is d. It is about (2π).

Here, in the leaching region 141 and the opposing region 151, when the distance from the surface of the first conductor portion 111 or the second conductor portion 121 is z, the amplitude of the ^leaked electromagnetic wave is approximately e ^{−z / L.} Attenuates.

Therefore, the interface device is arranged within a distance L from the first conductor portion 111 (or the second conductor portion 121), and φ _n is induced to transmit a signal. Depending on the sensitivity of the interface device, the distance d may be about d instead of the distance L. That is, the thickness of the leaching region 141 (or the opposing region 151) can be considered to be about L to d.

  The following is considered in more detail. FIG. 8 is an explanatory diagram showing the state of the coordinate system used for the analysis of the signal transmission device 101. Hereinafter, a description will be given with reference to FIG.

  As shown in this figure, a mesh-shaped first conductor 111 having a repeating unit length d is disposed at z = 0, and a second conductor 121 is disposed at z = -D. And The portions other than the first conductor portion 111 and the second conductor portion 121 are filled with a dielectric having a dielectric constant ε. The mesh is a square mesh. The origin overlaps the mesh intersection, and the x and y axes are parallel to the mesh.

At this time, electromagnetic energy is localized in the vicinity of the mesh, and for the electric field E of the electromagnetic field,
E _z = Af (x, y, z) exp (-j (xk _x + yk _y ))
There is a traveling wave solution in the form of Where E _z is the z component of the electric field, A, k _x , k _y are constants, f (x, y, z) is a function with period d in the x direction and y direction, and k = (k _x , k _y , 0) is a wave vector (propagation vector) indicating the traveling direction of the traveling wave.

That is, for any x, y, z
f (x + d, y, z) = f (x, y, z) = f (x, y + d, z)
Is established.

Now, the electromagnetic field including E _z has a wave equation ΔE _z =-(ω ² / c ² ) E _{z in the} dielectric.
The filling,
k _x ² + k _y ² ≒ ω ² / c ²
It is.

Here, paying attention to the electromagnetic field at z> 0, f can be subjected to the following Fourier expansion due to the periodicity of f.
f (x, y, z) = Σ _{m, n} a (m, n) exp (2πj mx / d) exp (2πj ny / d) g (m, n, z)
Here, m and n are integers.

When d is sufficiently smaller than the electromagnetic wave length λ, 2π / d is sufficiently larger than ω / c, and (m, n) ≠ (0,0), the independence of each component of the Fourier expansion
u (m, n) = exp (2πj mx / d) exp (2πj ny / d) g (m, n, z)
Is approximately
Δu = (-(2πm / d) ^2- (2πn / d) ² + ∂ ² / ∂z ² ) u = 0
That is,
∂ ² / ∂z ² g ≒ (2π) ² (m ² + n ² ) / d ² g
Meet. Therefore,
g (m, n, z) ≒ B exp (-2π (m ² + n ² ) ^1/2 z / d)
It is. However, B is a constant. Therefore, for the component of (m, n) ≠ (0,0), the attenuation constant is d / (2π) or less.

  Here, the component of (m, n) ≠ (0,0) corresponds to a traveling wave component subjected to modulation of the period of the mesh structure.

Further, (m, n) = component corresponding to (0,0), i.e., the traveling wave component not modulated periodic mesh structure, the wavelength ^{_{λ = 2π / (k x 2}} + k y 2) 1 ^It reaches up to about ^{/ 2,} but its strength is small. This component is a component directly related to the term exp (−j (xk _x + yk _y )).

Due to such a theoretical background, the first conductor portion 111 is a conductor having a mesh shape with a square mesh shape of d = 2 [mm], the second conductor portion 121 is a foil-like conductor, and the first conductor portion 111 is When the average linear charge density σ = 0.001 [C / m] was given, the vertical electric field E _z [V / m] generated was multiplied by a constant 4πε. The electromagnetic wave length was assumed to be sufficiently larger than the mesh interval, and here, the calculation was performed assuming that a uniform charge distribution occurred in a region corresponding to 120 × 120 mesh.

  Similarly to the above, the first conductor portion 111 is disposed at z = 0, and the second conductor portion 121 is disposed at z = −D. The origin overlaps the mesh intersection, and the x and y axes are parallel to the mesh.

  FIG. 9 is an explanatory diagram showing vertical electric field strengths at various locations of the signal transmission device in this case. Hereinafter, a description will be given with reference to FIG.

  As shown in the upper three graphs, (x, y) = (0,0), (x, y) = (d / 2, d / 2), (x, y) = (d / 2 , 0), it can be seen that the vertical electric field becomes almost zero from around z = 1 [mm]. Further, the vertical electric field at y = 1 [mm] and z = 0.2 [mm] has a periodic pattern as shown in one graph at the bottom of the figure.

  Thus, when the repeating unit length of the mesh is 2 mm, the leakage of the electromagnetic field is considered to be about 1 mm, so if you bring the interface device closer than this distance, induction between the electromagnetic field becomes possible, It will be possible to send and receive signals.

  The electric field distribution when the second conductor 121 arranged at z = −D has the same mesh structure as that of the first conductor 111 arranged at z = 0 is based on the principle of symmetry, z = −D / The distribution is the same as that in the case where the foil-like second conductor portion 121 is arranged in 2 and the mesh-like first conductor portion 111 is arranged in z = 0. Therefore, the same conclusion as above can be obtained.

  As described above, it is sufficient to consider the order of d / (2π) to d / 2 to d as the thickness of the leaching region 141 and the facing region 151, and the interface in the leaching region 141 and the facing region 151 is sufficient. Communication can be performed by “soaking” the device.

Incidentally, sometimes leach to (m, n) = component corresponding to (0,0), the degree of electromagnetic wavelength ^{_{λ = 2π / (k x 2}} + k y 2) 1/2 in the communication layer However, near the surface of the communication layer, the intensity of this component is smaller than that of the other components and can be ignored.

  Note that the mesh does not necessarily have to be a square repetition, and may be various polygonal meshes. Further, the unit of the mesh need not be limited to the same shape, and may be a different shape as long as it has an appropriate mesh shape. In this case, the value corresponding to the above d can be considered as an average of the sizes of the meshes. Moreover, when these basic periods exist, the period can also be considered as d.

  In addition, a flat conductor having a plurality of honeycomb punch holes formed in a honeycomb shape may be used as the first conductor portion 111. In this case, the distance between the centers of the circles corresponds to d described above.

  FIG. 10 is an explanatory diagram when a wired connection is made to the signal transmission device. Hereinafter, a description will be given with reference to FIG.

  As shown in this figure, the width of the electric wire is adjusted so that the impedance is matched immediately before the joint portion 903 where the mesh-shaped first conductor portion 111 of the signal transmission device 101 is connected to the core wire of the coaxial cable 902. Further, the outer conductor of the coaxial cable 902 is connected to the second conductor portion 121.

  Further, in the example shown in the figure, a strip-shaped conductor portion 904 is disposed on the edge of the first conductor portion 111, and a collective resistance or the like is provided between the strip-shaped conductor portion 904 and the second conductor portion 121. The electromagnetic wave absorber is arranged to prevent leakage of electromagnetic waves.

  FIG. 11 is an explanatory diagram illustrating an embodiment in which the first conductor portion of the signal transmission device is not in a mesh shape but in a stripe shape.

  As shown in the figure, the first conductor portion 111 of the signal transmission device 101 is disposed on the front side of the second conductor portion 121 in the figure, and the first conductor portion 111 is not in a mesh shape but in a stripe shape concentrated at the root. It is the shape of. If the distance between the stripes is d, the degree of oozing out of the electromagnetic wave is about d as in the above embodiment, so that the leaching region similar to that in the above embodiment can be formed.

  As described above, according to the present invention, signals are transmitted by changing the electromagnetic field in the narrow space between the mesh-like conductor portion and the sheet-like conductor portion and the leaching region outside the mesh-like conductor portion. Thus, it is possible to provide a signal transmission system that combines the signal transmission devices.

It is explanatory drawing which shows schematic structure of the signal transmission apparatus used in combination with the interface apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the schematic structure which concerns on the Example of a 1st signal transmission apparatus. It is explanatory drawing which shows the schematic structure which concerns on the Example of a 2nd signal transmission apparatus. It is explanatory drawing which shows the mode of arrangement | positioning of a 1st signal transmission apparatus and a 2nd signal transmission apparatus. It is a graph which shows the mode of the reception strength with respect to each frequency in a reference position. It is a graph which shows the mode of receiving intensity when the relative position of a signal transmission apparatus is shifted from a reference position in the 2.4 GHz band. It is explanatory drawing which shows schematic structure of the signal transmission apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the mode of the coordinate system used for the analysis of a signal transmission apparatus. It is explanatory drawing which shows the intensity | strength of the vertical electric field of the various places of a signal transmission apparatus. It is explanatory drawing in the case of performing wired connection to a signal transmission apparatus. It is explanatory drawing which shows embodiment which made the 1st conductor part of the signal transmission apparatus the stripe shape instead of the mesh shape.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Signal transmission apparatus 111 1st conductor part 121 2nd conductor part 131 Narrow area | region 141 Exudation area | region 151 Opposite area | region 181 Protection sheet 182 SMA connector 183 Coaxial cable 184 Network analyzer

Claims (8)

A signal transmission system comprising a sheet-like first signal transmission device that transmits a signal by a change in an electromagnetic field, and a second signal transmission device,
The first signal transmission device and the second signal transmission device are respectively (a) a first conductor portion in a mesh shape that is a conductor in the frequency band of the electromagnetic field,
(B) It is arranged substantially parallel to the first conductor part and spaced apart by an interval sufficiently shorter than the wavelength in the frequency band of the electromagnetic field, and the outer shape which is a conductor in the frequency band of the electromagnetic field has a flat plate shape. A second conductor,
With
The first signal transmission device and the second signal transmission device are respectively (c) a narrow region sandwiched between the outer shape of the first conductor portion and the outer shape of the second conductor portion, and the first In the leaching region having a flat plate shape located on the opposite side across the outer space of the conductor portion, the electromagnetic field is transmitted in the frequency band,
(D) Of the intensity of the electromagnetic field in the leaching region, the intensity of the traveling wave component affected by the mesh shape is exponentially attenuated by the distance from the outer shape of the first conductor part,
The first signal transmission device and the second signal transmission device are arranged so that the leaching areas of the first signal transmission device and the second signal transmission device overlap, and the first signal transmission device, the second signal transmission device, In each of
(E) The change of the electromagnetic field in the interstitial region and the leaching region is transmitted to the counterpart signal transmission device arranged in the leaching region, or from the counterpart signal transmission device to the interstitial region and the leaching region A signal transmission system for transmitting a signal by transmitting a change in an electromagnetic field and changing a voltage between the first conductor portion and the second conductor portion. The signal transmission system according to claim 1,
At least one of the first signal transmission device and the second signal transmission device is:
(F) A communication device is wired to the first conductor portion and the second conductor portion,
(G) Transmitting the voltage between the first conductor part and the second conductor part, which changes together with the electromagnetic field in the gap area and the leaching area, to the communication apparatus, or from the communication apparatus, the first A signal transmission system, wherein a signal is transmitted by changing a voltage between a conductor portion and the second conductor portion to change an electromagnetic field in the gap region and the leaching region. The signal transmission system according to claim 1 or 2,
In at least one of the first signal transmission device and the second signal transmission device,
The signal transmission system characterized in that the unit length of repetition of the mesh shape is sufficiently shorter than the wavelength in the frequency band of the electromagnetic field, and the thickness of the leaching region is not more than the repetition unit length. The signal transmission system according to claim 1,
In at least one of the first signal transmission device and the second signal transmission device,
The average width of the mesh size of the mesh-shaped mesh is sufficiently shorter than the wavelength in the frequency band of the electromagnetic field, and the thickness of the leaching region is not more than the repeating unit length. Transmission system. The signal transmission system according to claim 1,
In at least one of the first signal transmission device and the second signal transmission device,
The mesh-like shape is a mesh shape in which polygons of the same shape are repeated, and the unit length of the repetition is sufficiently shorter than the wavelength in the frequency band of the electromagnetic field, and the mesh shape of the electromagnetic field in the leaching region The signal transmission system is characterized in that the intensity of the traveling wave component affected by is attenuated exponentially with respect to the distance from the outer shape of the first conductor portion to the leaching region, or attenuated faster than this. The signal transmission system according to claim 1,
In at least one of the first signal transmission device and the second signal transmission device,
The mesh-like shape is a mesh shape in which a plurality of circular holes are provided on a flat plate, and the center distance between the circular holes is sufficiently shorter than the wavelength in the frequency band of the electromagnetic field. The intensity of the traveling wave component affected by the mesh shape attenuates exponentially with respect to the distance from the outer shape of the first conductor portion to the leaching region, or attenuates faster than this. system. The signal transmission system according to claim 1,
In at least one of the first signal transmission device and the second signal transmission device,
The second conductor portion has a mesh shape, and in a flat plate-like facing region located on the opposite side across the outer shape of the second conductor portion, the electromagnetic field is further applied in the frequency band. The signal transmission system characterized by transmitting. The signal transmission system according to claim 1,
In at least one of the first signal transmission device and the second signal transmission device,
A signal transmission system, wherein the first conductor portion is formed in a stripe shape instead of a mesh shape.

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