JP7577488B2 - Communication Equipment - Google Patents

Description

The present invention relates to a communication device.

A communication system is known that uses electromagnetic coupling to perform wireless communication between nearby devices. Patent Document 1 discloses a device for performing high data rate communication between a rotating frame and a stationary frame.

Japanese Patent Application Publication No. 8-224232

In Patent Document 1, signals are configured to be transmitted via multiple transmission lines, and there is a risk that the accuracy of communication will decrease due to interference between a signal transmitted to a desired transmission line and a signal transmitted to other transmission lines.

The present invention is a communication device that communicates with a device that moves relatively in a predetermined direction , and is characterized in that it has a plurality of transmission lines extending in the predetermined direction and having a power supply portion and a termination portion, the power supply portions of each of the plurality of transmission lines are adjacent to each other in the predetermined direction, and the respective termination portions are arranged adjacent to each other in the predetermined direction, and a shield portion is arranged between each of the termination portions .

The present invention makes it possible to prevent a decrease in communication accuracy.

FIG. 1 is a diagram for explaining the principle of wireless communication in a communication system. FIG. 2 is a diagram for explaining each signal in the communication system. FIG. 1 illustrates an example of a configuration of a communication system. FIG. 11 is a diagram illustrating an example of an output frequency characteristic of a receiving communication device. 11 is a diagram showing an example of an eye pattern of an output signal of a receiving communication device; FIG. FIG. 1 illustrates an example of a configuration of a communication system according to a first embodiment. 5 is a diagram illustrating an example of an output frequency characteristic of a receiving communication device according to the first embodiment; FIG. 11 is a diagram illustrating an example of a configuration of a communication system according to a second embodiment. FIG. 11 is a diagram illustrating an example of an output frequency characteristic of a receiving communication device according to the second embodiment. FIG. 4 is a diagram showing frequency characteristics of reflection in a power supply section.

First, the principle of wireless communication in the communication system applied to this embodiment will be described.
Fig. 1 is a diagram showing a schematic configuration of a communication system, and Fig. 2 is a diagram for explaining each signal in the communication system.

As shown in FIG. 1A, the communication system includes a communication device 100 on the transmitting side and a communication device 200 on the receiving side.
The transmitting communication device 100 is configured to be long in one direction and functions as a transmitting coupler that transmits a radio signal. A differential transmission transmission line 101, which is two linear conductor members arranged side by side, is a transmitting line that transmits a radio signal. The transmission line 101 is formed as a pattern on a substrate. Data output from a signal source 102 is input as a differential signal via a differential transmission buffer 103 connected to one end of the transmission line 101. The other end of the transmission line 101 is terminated by a termination resistor 104 that is approximately equal to the characteristic impedance of the transmitting transmission line 101. The ground 105 serves as a reference potential for the transmitting transmission line 101, and is arranged in contact with the substrate on which the transmission line 101 is formed.

The receiving communication device 200 is disposed at a distance from the transmitting communication device 100 and functions as a receiving coupler that receives a radio signal. The receiving communication device 200 corresponds to an example of a device that communicates with the transmitting communication device 100. The differential coupler 202, which is two linear conductor members arranged side by side, is a receiving transmission line that receives a radio signal from the transmission line 101. The coupler 202 is formed as a pattern on the substrate 201. The transmission line 202 can move approximately parallel along the longitudinal direction of the transmission line 101. As shown in FIG. 1B, the coupler 202 and the transmission line 101 overlap when viewed from a direction perpendicular to the moving direction of the receiving communication device 200 and from a direction perpendicular to the direction in which the two conductor members are adjacent to each other. The signal output from the coupler 202 is waveform-shaped by the waveform shaping circuit 203 and then detected as a received signal.

2 is a diagram for explaining each signal of the communication system, in which the horizontal axis indicates time and the vertical axis indicates signal strength in the waveform of FIG.
2A shows a signal output from signal source 102. Fig. 2B shows a signal output from transmission line 101. The signal output from transmission line 101 is delayed by Δt ₁ from the signal output from signal source 102 by adding the delay in differential transmit buffer 103 and the propagation delay.

Fig. 2C shows a signal output from coupler 202 when the input impedance of waveform shaping circuit 203 is low. As shown in Fig. 2C, the output of coupler 202 is an edge signal. In this case, by demodulating the signal using a comparator having a hysteresis voltage of ±Vth in waveform shaping circuit 203, waveform shaping circuit 203 outputs a signal having a waveform similar to that of Fig. 2A, as shown in Fig. 2E.
Fig. 2(D) shows a signal output from the transmission line 202 when the input impedance of the waveform shaping circuit 203 is high, and the output of the coupler 202 is a signal with a waveform with a small amplitude that is almost the same as the input signal. In this case, by amplifying and demodulating the signal to a level that allows digital signal processing using an amplifier or the like in the waveform shaping circuit 203, the waveform shaping circuit 203 outputs a signal with a waveform similar to that of Fig. 2(A), as shown in Fig. 2(E).

Next, the configuration of a communication system 10 using the above-mentioned principle will be described. Note that the same components as those in FIG. 1 are given the same reference numerals.
3A is a diagram showing an example of the configuration of the communication system 10. Here, the communication system 10 is a device including a rotation mechanism 400 that rotates around a rotation axis O.
The communication system 10 includes a transmitting communication device 300 , a receiving communication device 200 , and a rotation mechanism 400 .

The transmitting communication device 300 is configured in a circular ring shape and functions as a transmitting coupler that transmits wireless signals. The transmitting communication device 300 includes a substrate 301, transmission lines 303a and 303b, a metal part 304, and an input side substrate 305. Here, the transmission line 303a corresponds to an example of a first transmission line, and the transmission line 303b corresponds to an example of a second transmission line.

The substrate 301 is formed in a circular ring shape, and the inner surface (inner peripheral surface) and the outer surface (outer peripheral surface) are curved. The substrate 301 is a rigid substrate such as a glass epoxy substrate. The substrate 301 has a ground 302 on its inner surface. The substrate 301 may be formed in a circular ring shape using a single substrate, or may be formed in a circular ring shape by connecting multiple substrates.

The transmission lines 303a and 303b are formed as a pattern on the outer surface of the substrate 301. The transmission lines 303a and 303b are arranged along the longitudinal direction of the substrate 301. The transmission lines 303a and 303b are arranged so as to be substantially linear along the circumferential direction of the substrate 301 without overlapping each other. Specifically, the transmission line 303a is arranged along substantially one half of the entire circumference of the substrate 301 (substantially 180°), and the transmission line 303b is arranged along substantially the other half of the entire circumference of the substrate 301 (substantially 180°). In addition, one end of the transmission lines 303a and 303b in the longitudinal direction is a power supply section to which a signal is input. On the other hand, the other end of the transmission lines 303a and 303b, which is opposite to the one end of the transmission lines 303a and 303b in the longitudinal direction, is a termination section. The power supply portion of transmission line 303a and the power supply portion of transmission line 303b are adjacent to each other in the longitudinal direction of substrate 301. Furthermore, the terminal end of transmission line 303a and the terminal end of transmission line 303b are adjacent to each other in the longitudinal direction of substrate 301. The start end and the terminal end of transmission lines 303a and 303b are disposed opposite to each other across rotation axis O of rotation mechanism 400. With such transmission lines 303a and 303b, the direction of a signal transmitted along transmission line 303a and the direction of a signal transmitted along transmission line 303b are opposite to each other.
Each of the transmission lines 303a and 303b has two conductor members arranged in parallel along the longitudinal direction, and the inner surface of the substrate 301 is grounded to form a transmission line for differential transmission, here a differential microstrip line.

Metal part 304 is formed in a circular ring shape like substrate 301, and has a curved inner surface (inner peripheral surface) and outer surface (outer peripheral surface). Metal part 304 functions as a base part supporting substrate 301 by connecting its outer surface to the inner surface of substrate 301. Note that ground 302 is the reference potential for transmission lines 303a and 303b, but ground 302 may be omitted and metal part 304 may be used as the metal for the reference potential of transmission lines 303a and 303b. Metal part 304 may be formed in a circular ring shape as a single unit, or may be formed in a circular ring shape by connecting multiple metal parts.

FIG. 3B is an enlarged view showing an example of the configuration of the input side substrate 305.
The input side board 305 is disposed close to the power feed parts of the transmission lines 303a and 303b. The input side board 305 has an input terminal 306, a differential amplifier 307, and splitters 308a and 308b mounted thereon. A signal from a signal source is input to the input terminal 306. The differential amplifier 307 converts the signal input from the input terminal 306 into a differential signal. The splitters 308a and 308b split the two differential outputs output from the differential amplifier 307, and the split differential outputs are input to the power feed parts of the transmission lines 303a and 303b, respectively.
In addition, the input side board 305 may be configured to split the signal input from the input terminal 306 into two using a splitter and amplify each of the split signals using a differential amplifier, or may be configured using a balun or the like for single-differential conversion.

Figure 3(c) is a cross-sectional view of the configuration around the end portions of the transmission lines 303a and 303b, viewed along the axis of rotation O. The transmission lines 303a and 303b are terminated by termination resistors 310a and 310b, respectively, through vias 309a and 309b, on the inner side of the substrate 301, so as to match the differential characteristic impedance of the transmission lines 303a and 303b. The termination resistors 310a and 310b may be arranged in various forms, but may also be arranged in a space where a part of the metal part 304 is cut out, as shown in this figure.

The receiving communication device 200 is disposed at a distance from the outer surface of the substrate 301 of the transmitting communication device 300, and functions as a receiving coupler that receives radio signals. The receiving communication device 200 comprises a substrate 201, a coupler 202, and a waveform shaping circuit 203. The receiving communication device 200 moves relatively along the longitudinal direction of the transmission lines 303a, 303b while maintaining a certain distance from the transmission lines 303a, 303b of the transmitting communication device 300.

The rotation mechanism 400 has a rotating part that rotates around the rotation axis O, and a fixed part that is fixed without rotating. In this embodiment, the rotating part of the rotation mechanism 400 is connected to the transmitting communication device 300, and the fixed part of the rotation mechanism 400 is connected to the receiving communication device 200. Therefore, since the transmitting communication device 300 can rotate around the rotation axis O, the transmitting communication device 300 and the receiving communication device 200 can communicate with each other while rotating relative to each other.
Note that the rotating part of the rotating mechanism 400 may be connected to the receiving communication device 200, and the fixed part of the rotating mechanism 400 may be connected to the transmitting communication device 300. Alternatively, a first rotating part of the rotating mechanism 400 may be connected to the receiving communication device 200, and a second rotating part of the rotating mechanism 400 may be connected to the transmitting communication device 300, so that both the transmitting communication device 300 and the receiving communication device 200 are independently rotatable around the rotation axis O.

Here, a description will be given of signals near the terminations of the transmission lines 303a and 303b to which the termination resistors 310a and 310b are connected in the transmitting communication device 300 configured as described above. In the vicinity of the terminations of the transmission lines 303a and 303b, signals that have been transmitted through the transmission line on the opposite side to the transmission line signal that should be received and have not been absorbed by the termination resistors and have exceeded the termination resistors exist as interference signals.
When the receiving communication device 200 is located very close to the termination resistors 310a and 310b, the arrival time difference between the signal on the transmission line that should be received and the interference signal is small. As the receiving communication device 200 gradually moves away from the termination, the arrival time difference between the signal that should be received and the interference signal becomes larger. Due to this arrival time difference, the combined signal is large at frequencies where the phases of the signal that should be received and the interference signal are in phase, and is small at frequencies where the phases are inverted.

Fig. 4 is a diagram showing an example of the output frequency characteristic of the communication device 200 according to the position of the receiving communication device 200. Fig. 4(a) shows the frequency characteristic when the receiving communication device 200 is located at the midpoint between the end of the transmission line 303a and the end of the transmission line 303b (see the dashed line C shown in Fig. 3(c)). Fig. 4(b) shows the frequency characteristic when the receiving communication device 200 is located 40 mm away from the midpoint between the end of the transmission line 303a and the end of the transmission line 303b.
As shown in FIG. 4B, when the receiving communication device 200 is away from the midpoint between the end of the transmission line 303a and the end of the transmission line 303b, the range between the maximum and minimum gain values becomes larger depending on the frequency, and the accuracy of the output signal decreases.

Figure 5 is a diagram showing an example of an eye pattern of an output signal under the same conditions as Figure 4, where the horizontal axis indicates time and the vertical axis indicates voltage. Here, the signal input to the transmission lines 303a and 303b is 10 Gbps. Figure 5 (a) shows a case where the receiving communication device 200 is located at the midpoint between the end of the transmission line 303a and the end of the transmission line 303b, and the eye pattern is open because there is no phase difference between the signals excited from the transmission lines 303a and 303b to the receiving communication device 200. Figure 5 (b) shows a case where the receiving communication device 200 is located 40 mm away from the midpoint between the end of the transmission line 303a and the end of the transmission line 303b, and the eye is closed, indicating that the receiving communication device 200 is not correctly demodulating the signal.

Next, we will explain the configuration of a communication system that can prevent the signal accuracy from decreasing near the terminal as described above. Note that the same components as those in FIG. 3 are given the same reference numerals and their explanations will be omitted as appropriate.

[First embodiment]
FIG. 6A is a diagram showing an example of the configuration of a communication system 20 according to the first embodiment.
The communication system 20 includes a transmitting communication device 600 , a receiving communication device 200 , and a rotation mechanism 400 .

The transmitting communication device 600 includes substrates 601 a and 601 b , transmission lines 303 a and 303 b , a metal part 304 , an input substrate 305 , and a shield plate 620 .
The substrates 601a and 601b are formed by dividing the substrate 301 shown in Fig. 3 into a plurality of substrates. The transmission line 303a is formed on the substrate 601a, and the transmission line 303b is formed on the substrate 601b.

6B is a cross-sectional view of the configuration around the terminal ends of the transmission lines 303a and 303b, as viewed along the rotation axis O. The transmission lines 303a and 303b are terminated by termination resistors 310a and 310b via vias 309a and 309b, respectively, in the same manner as in FIG.
In this embodiment, a shield plate 620 for blocking interference signals is disposed between the adjacent end portions of the transmission lines 303a and 303b. The shield plate 620 corresponds to an example of a shield portion. The shield plate 620 is made of metal.

Specifically, the shield plate 620 is located between the end of the substrate 601a on which the transmission line 303a is formed and the end of the substrate 601b on which the transmission line 303b is formed. The shield plate 620 is also located between the via 309a of the substrate 601a and the via 309b of the substrate 601b. Here, the width WS of the shield plate 620 (length along the rotation axis O) is wider than the width WL of the transmission lines 303a and 303b (length obtained by adding the width of each of the two conductor members and the width between the two conductor members) (see FIG. 6(a)). The width WS of the shield plate 620 is approximately the same as the width of the substrates 601a and 601b. The shield plate 620 is also electrically connected to the ground 302 or the metal part 304 on the inner side of the substrates 601a and 601b.

Fig. 7 is a diagram showing an example of frequency characteristics of the output of the communication device 200 depending on the position of the communication device 200 on the receiving side that receives a signal from the communication device 600 on the transmitting side having the shield plate 620. Fig. 7(a) shows frequency characteristics when the communication device 200 on the receiving side is located at the midpoint between the end of the transmission line 303a and the end of the transmission line 303b (see the dashed line C shown in Fig. 6(b)), that is, when it is located directly above the shield plate 620. Fig. 7(b) shows frequency characteristics when the communication device 200 on the receiving side is located 40 mm away from the midpoint between the end of the transmission line 303a and the end of the transmission line 303b.
As shown in FIG. 7B, the provision of the shield plate 620 blocks interference signals, and as a result, the range between the maximum and minimum values of the gain is significantly reduced, particularly at frequencies of 12 GHz or less.

Figure 8 is a diagram showing an example of an eye pattern of an output signal under the same conditions as in Figure 7, where the horizontal axis indicates time and the vertical axis indicates voltage. Here, the signal input to the transmission lines 303a and 303b is 10 Gbps. Figure 8(a) shows a case where the receiving communication device 200 is located at the midpoint between the end of the transmission line 303a and the end of the transmission line 303b, and the eye pattern is open. Figure 8(b) shows a case where the receiving communication device 200 is located 40 mm away from the midpoint between the end of the transmission line 303a and the end of the transmission line 303b, and the eye pattern is open as in Figure 8(a), indicating that the receiving communication device 200 can demodulate the signal.

As described above, according to this embodiment, by disposing the shield plate 620 between the end of the transmission line 303a and the end of the transmission line 303b that are adjacent in the direction in which the receiving communication device 200 moves relative to each other, the shield plate 620 blocks interference signals that should not be received. Therefore, even if the receiving communication device 200 is located away from the midpoint between the end of the transmission line 303a and the end of the transmission line 303b, it is possible to prevent a decrease in the accuracy of the signal output by the communication device 300.

In the above embodiment, the terminals of the transmission lines 303a and 303b are formed on different substrates 601a and 601b, but the terminals of the transmission lines 303a and 303b may be formed on a single substrate. In this case, the shield plate 620 can be inserted into a hole formed in the substrate, so that the shield plate 620 can be disposed between the adjacent terminals of the transmission lines 303a and 303b.
3 and 6, the transmission lines 303a and 303b are arranged on the outside of the circumference, and the receiving communication device 200 is arranged further outside thereof. However, the transmission lines 303a and 303b may be arranged on the inside of the circumference, and the receiving communication device 200 may be arranged further inside thereof.

[Second embodiment]
Fig. 9A is a diagram showing an example of the configuration of a communication system 30 according to the second embodiment. Fig. 9A shows an exploded view of a part (the periphery of the terminals of transmission lines 903a and 903b described later) of a transmitting-side communication device 900 configured in a circular ring shape. Note that the same reference numerals are used to designate the same components as those in the first embodiment.
The communication system 30 includes a transmitting communication device 900, a receiving communication device 200, and a rotation mechanism 400 (not shown).

The transmitting communication device 900 includes substrates 901 a and 901 b , transmission lines 903 a and 903 b , a metal part 904 , and a shield plate 920 .
The substrates 901a and 901b are formed in an annular shape, and the inner surface (inner peripheral surface) and the outer surface (outer peripheral surface) are curved. The substrates 901a and 901b are flexible printed circuit boards having flexibility. The substrate 901a has a pattern of a transmission line 903a formed thereon, and the substrate 901b has a pattern of a transmission line 903b formed thereon.

The metal part 904 is formed in a circular ring shape like the substrates 901a and 901b. The metal part 904 has a substantially U-shaped cross section having a pair of sidewall parts 904a and a bottom part 904b. In the metal part 904, a space surrounded by the pair of sidewall parts 904a and the bottom part 904 is formed. In addition, a hole 904c that communicates the space with the outside is formed in a part of the bottom part 904 along the width direction of the bottom part 904. The metal part 904 functions as a base part supporting the substrates 901a and 901b by connecting the pair of sidewall parts 904a to the inner surfaces of the substrates 901a and 901b.
In addition, the transmission lines 903a and 903b each have two conductor members arranged in parallel along the longitudinal direction, and the inner surfaces of the substrates 901a and 901b are connected to the metal part 904 and grounded to form a transmission line for differential transmission, in this case a differential microstrip line.

FIG. 9B is a cross-sectional view of the configuration around the terminal ends of the transmission lines 903a and 903b, as viewed along a rotation axis O (not shown).
The transmission lines 903a and 903b have extensions 910a and 910b that extend in a direction different from the longitudinal direction of the transmission lines 903a and 903b at the end portions. Specifically, the substrates 901a and 901b are bent toward the bottom 904b of the metal part 904 via the bent portions 911, so that the transmission lines 903a and 903b formed on the substrates 901a and 901b also extend toward the bottom 904b. The extension 910a of the transmission line 903a is connected to a rigid substrate 912a, and the extension 910b of the transmission line 903b is connected to a rigid substrate 912b. The rigid substrates 912a and 912b are respectively equipped with a transmission circuit or a termination resistor. The transmission lines 903a and 903b are terminated by the termination resistors mounted on the rigid substrates 912a and 912b. When the substrates 901 a and 901 b are connected to the metal part 904 , the rigid substrates 912 a and 912 b and the extensions 910 a and 910 b are inserted into the holes 904 c of the metal part 904 .

In this embodiment, a shield plate 920 for blocking interference signals is disposed between adjacent end portions of the transmission lines 903a and 903b.
Specifically, the shield plate 920 is sandwiched between a rigid board 912a to which the transmission line 903a is connected and a rigid board 912b to which the transmission line 903b is connected. Therefore, the shield plate 920 is located between an extending portion 910a of the transmission line 903a and an extending portion 910b of the transmission line 903b. The shield plate 920 is also located between the termination resistor of the transmission line 903a and the termination resistor of the transmission line 903b.

The shield plate 920 may also be disposed between adjacent power supply portions of the transmission lines 903a and 903b.
Fig. 10 is a diagram showing the frequency characteristics of reflection at the power feed section when a shield plate 920 is placed between adjacent terminations of transmission lines 903a and 903b and between adjacent power feed sections of transmission lines 903a and 903b. The dashed line in Fig. 10 shows the characteristic line when a shield plate 920 is placed between the power feed sections, and the solid line in Fig. 10 shows the characteristic line when a shield plate is not placed between the power feed sections. As shown in Fig. 10, the termination section is designed to optimize the reflection characteristics of the termination section by taking into account the shield plate 920, so that the reflection characteristics are improved by sandwiching the shield plate 920 in the power feed section.

The improvement in reflection characteristics by placing the shield plate 920 is the same for both the power feed section and the termination section, so if the power feed section and the termination section have a similar structure, the signal quality can be improved by placing the shield plate 920 in the power feed section to improve the reflection characteristics. In particular, in the termination section, not only is the reflection characteristic improved, but the signal propagating through the opposing transmission line can be suppressed as described in the first embodiment, reducing signal distortion due to interference.

Thus, according to this embodiment, by disposing a shield plate 920 between the ends of transmission lines 903a and 903b that are adjacent in the direction in which the receiving communication device 200 moves relative to one another, the shield plate 920 blocks interference signals that should not be received.
In addition, when image data is wirelessly transmitted between communication devices 600, 900 and communication device 200, the signal quality is improved when wirelessly transmitting image data, thereby reducing errors and enabling the transmission of highly reliable data.

In the above-described embodiments, the transmission lines are described as differential microstrip lines. However, the present invention is not limited to this case, and other types of differential transmission lines may be used, such as differential coplanar lines or differential coplanar lines with grounds.
Further, in the above-described embodiments, the transmission line is a differential transmission line. However, the present invention is not limited to this, and the transmission line does not have to be differential as long as external noise and unnecessary radiation do not pose a problem.

In addition, in each of the above-mentioned embodiments, the case where the shielding portion is a shielding plate has been described, but this is not limited to this case. The shielding portion may have any structure capable of suppressing the electric field between the transmission lines, and may be of other structures or materials, such as a metal body with a mesh structure, a structure made of conductive resin, etc. In addition, when the transmission lines are formed on a substrate, the shielding portion may be composed of a plurality of vias connected to the ground on the inner surface of the substrate.

In addition, in each of the above-described embodiments, the communication devices 600 and 900 are the transmitting side and the communication device 200 is the receiving side, but this is not limited to the above, and the communication devices 600 and 900 may be the receiving side and the communication device 200 may be the transmitting side. In addition, the communication devices 200, 600, and 900 may be capable of transmitting and receiving signals.

As stated above, the present invention is defined by the claims and is not limited to the above-mentioned embodiments. Furthermore, not all combinations of features described in the above-mentioned embodiments are necessarily essential to the present invention. Furthermore, the contents described in the specification and drawings are merely examples and should not be considered as limiting the present invention. Furthermore, various modifications (including organic combinations of the respective embodiments) are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention. In other words, all configurations that combine the above-mentioned embodiments and their modifications are included in the present invention.

600, 900: Transmitting communication device 200: Receiving communication device 601a, 601b, 901a, 901b: Substrate 303a, 303b, 903a, 903b: Transmission line 620, 920: Shield plate

Claims (9)

A communication device that communicates with a device that moves relatively in a predetermined direction ,
A plurality of transmission lines extending in the predetermined direction and having a power supply portion and a termination portion,
the power supply portions of the transmission lines are adjacent to each other in the predetermined direction, and the termination portions of the transmission lines are adjacent to each other in the predetermined direction;
A communication device, comprising : a shield portion disposed between each of said terminal portions . the power supply portion is located at an end of the transmission line,
2. The communication device according to claim 1 , wherein the termination portion is an end portion located on the opposite side to the power supply portion. the plurality of transmission lines includes a first transmission line and a second transmission line;
3. The communication device according to claim 1, wherein the first transmission line and the second transmission line are each a transmission line for differential signals in which two conductor members are arranged in parallel in the predetermined direction . The plurality of transmission lines are formed on a single substrate or on different substrates;
The shield portion is
4. A communication device according to claim 1, characterized in that the communication device is disposed between adjacent terminations of the plurality of transmission lines in the predetermined direction , in holes in the one substrate, or between the different substrates. the terminations of the plurality of transmission lines adjacent to each other in the predetermined direction each have an extending portion extending in a direction perpendicular to the predetermined direction ,
The shield portion is
5. The communication device according to claim 1, wherein the first and second terminals are disposed between adjacent terminal ends and between adjacent extensions of the plurality of transmission lines. a base portion disposed on an opposite side to a side on which the device is disposed with respect to the plurality of transmission lines;
The extension portion is
The communication device according to claim 5 , wherein the communication device is inserted into a hole formed in the base portion. 7. The communication device according to claim 1, wherein a termination resistor is connected to each of the terminal ends of the plurality of transmission lines. the plurality of transmission lines are arranged in a circular ring shape,
8. A communication device according to claim 1 , wherein at least one of the device and the communication device rotates around an axis of rotation. 9. The communication device according to claim 1, wherein the shield portion is made of a plate-shaped conductor.

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