Communication device

Abstract

To make it possible to widen a range of selecting a position to output a signal received by a transmission line or a position to input a signal transmitted by a transmission line.SOLUTION: A communication device has a first transmission line 301. The first transmission line has a first electrode 302, a second electrode 304 that is approximately parallel to the first electrode, and a third electrode 303 connecting the first electrode and the second electrode. The first electrode and the second electrode extend mutually in the same, approximately parallel direction from the third electrode.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a communication device. [Background technology]

[0002] 2. Description of the Related Art In recent years, production systems, robotic devices, and the like have been equipped with devices that communicate large amounts of data, such as cameras, and the like, and systems that transmit data at high speed between mechanical moving parts and fixed parts are becoming more common.

[0003] Patent Document 1 discloses a technology in which at least one of the fixed part and the moving part has a transmission line extending in the direction of movement, and data is transmitted between the transmission line and a coupler that couples with a magnetic field, an electric field, or both a magnetic field and an electric field. Patent Document 1 shows that when an electric signal propagating through the transmission line is to be received by a coupler that faces it in close proximity, the electric signal can be received efficiently by appropriately setting the positional relationship between the direction in which the electric signal is propagating and the power supply (termination) part of the coupler. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 63-71905 Summary of the Invention [Problem to be solved by the invention]

[0005] Consider a system that transmits data between two transmission lines that are close to each other and are coupled by a magnetic field, an electric field, or both a magnetic field and an electric field. Data transmission is performed by inputting a transmission signal to the power feed of one transmission line and receiving a reception signal from the power feed of the other transmission line that faces it. These transmission line pairs have the generally known properties of a directional coupler. That is, in order to efficiently receive an electrical signal propagating through one transmission line by the other transmission line, there is a constraint between the direction of the electrical signal propagating through the transmission line and the position of the power feed of the other transmission line. This constraint creates a problem in that it is not possible to freely select the relative positions of the power feeds of each transmission line.

[0006] An object of the present disclosure is to make it possible to expand the range of options for selecting a position from which a transmission line outputs a signal received by the transmission line or a position from which a transmission line inputs a signal to be transmitted by the transmission line. [Means for solving the problem]

[0007] The communication device has a first transmission line, the first transmission line having a first electrode, a second electrode substantially parallel to the first electrode, and a third electrode connecting the first electrode and the second electrode, the first electrode and the second electrode extending substantially parallel to each other in the same direction from the third electrode. Effect of the Invention

[0008] According to the present disclosure, it is possible to widen the range of positions from which a signal received by a transmission line can be output or from which a signal transmitted by a transmission line can be input. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 illustrates an example of the configuration of a wireless communication device. [Diagram 2] FIG. 1 is a diagram illustrating a configuration example of a transmission line. [Diagram 3] FIG. 1 is a diagram illustrating a configuration example of a transmission line. [Figure 4]FIG. [Diagram 5] 1A and 1B are diagrams illustrating examples of the shape of a transmission line. [Figure 6] FIG. 13 is a diagram showing an example in which a plurality of transmission lines are used. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (First embodiment) 1(a) and (b) are diagrams showing a configuration example of a wireless communication device 100. The wireless communication device 100 includes a transmission line 101, a differential buffer 102, a power supply unit 103, a termination unit 104, a transmission signal source 105, a transmission line 111, a power supply unit 112, a receiving circuit 113, and a termination unit 114.

[0011] A transmission signal source 105 generates a transmission signal. The transmission signal generated by the transmission signal source 105 is input to a differential buffer 102. The differential buffer 102 generates a differential signal corresponding to the input transmission signal. The transmission line 101 has a power supply unit 103 and a termination unit 104 near both ends thereof. The differential buffer 102 supplies the generated differential signal to the power supply unit 103.

[0012] The transmission line 111 is disposed close to the transmission line 101, and is coupled to the transmission line 101 by a magnetic field, an electric field, or both a magnetic field and an electric field. The transmission line 111 has a power feeding section 112 and a termination section 114 near both ends thereof. The termination sections 104 and 114 are matched and terminated with different termination resistors. The receiving circuit 113 receives the differential signal output from the power feeding section 112, and outputs a receiving signal corresponding to the received differential signal.

[0013] 1(b), the relationship between the positions of the power feeder 112 and the termination 114 of the transmission line 111 and the positions of the power feeder 103 and the termination 104 of the transmission line 101 is reversed from that of FIG. 1(a). Due to this difference in orientation, the frequency characteristics of the differential signal transmitted from the transmission line 101 to the transmission line 111 change.

[0014] The coupling state in the direction shown in FIG. 1(a) is generally called an isolation state. On the other hand, the coupling state in the direction shown in FIG. 1(b) is called a coupling state. When considering a wireless communication device 100 that enables wideband data transmission, it is desirable to have the coupling state in the direction shown in FIG. 1(b), that is, the coupling state. That is, it is desirable to set the relationship between the positions of the power supply unit 112 and the termination unit 114 of the transmission line 111 and the positions of the power supply unit 103 and the termination unit 104 of the transmission line 101 as shown in FIG. 1(b).

[0015] With reference to FIGS. 2(a) and (b), a description will be given of changes in the frequency characteristics of a transmitted signal in the isolation state of FIG. 1(a) and the coupling state of FIG. 1(b).

[0016] Fig. 2(a) is a diagram showing a configuration example of microstrip transmission lines 200 and 201. For example, the microstrip transmission line 200 corresponds to the transmission line 101 in Fig. 1(a) and (b), and the microstrip transmission line 201 corresponds to the transmission line 111 in Fig. 1(a) and (b). Fig. 1(a) and (b) show an example of differential signal transmission, but single-ended signal transmission may also be used.

[0017] Microstrip transmission line 200 has a linear electrode 203 on the upper surface of the substrate, and a ground electrode 204 covering the entire surface of the lower surface of the substrate. Microstrip transmission line 201 has a patterned electrode 205 on the lower surface of the substrate, and a ground electrode 206 covering the entire surface of the upper surface of the substrate.

[0018] In the case of differential signal transmission, two electrodes 203 and two electrodes 205 are provided. For example, ports P1 of the two electrodes 203 are connected to the differential buffer 102 of FIGS. 1(a) and (b). Ports P2 of the two electrodes 203 are connected to each other via a termination resistor. For example, port P4 of the two electrodes 205 is connected to the receiving circuit 113. A termination resistor is connected between port P3 of the two electrodes 205 and the ground electrode 206.

[0019] 1(a) and 1(b) serves as a buffer, and for example, the buffer is connected to port P1 of electrode 203, and a termination resistor is connected between port P2 of electrode 203 and ground electrode 206. Also, for example, receiving circuit 113 of FIG. 1(a) and 1(b) receives a single-ended signal from port P4 of electrode 205, and a termination resistor is connected between port P3 of electrode 205 and ground electrode 206.

[0020] A microstrip transmission line 200 formed on a substrate and a microstrip transmission line 201 formed on a substrate are disposed close to each other and are coupled by a magnetic field, an electric field, or both a magnetic field and an electric field. Ports P1 to P4 indicate the positions of excitation ports in an electromagnetic field simulator.

[0021] Fig. 2(b) is a graph showing the results of electromagnetic field analysis of the simulation model of Fig. 2(a). Graph 220 shows the power ratio S41 of the power transmitted from port P1 to port P4. Graph 221 shows the power ratio S42 of the power transmitted from port P2 to port P4.

[0022] The power ratio S41 of the graph 220 is the transfer characteristic in the coupling state of Fig. 1(b) described above, while the power ratio S42 of the graph 221 is the transfer characteristic in the isolation state of Fig. 1(a) described above.

[0023] First, the case of the coupling state in FIG. 1(b) will be described. In this case, for example, the microstrip transmission line 200 in FIG. 2(a) corresponds to the transmission line 101 in FIG. 1(b), and the microstrip transmission line 201 in FIG. 2(a) corresponds to the transmission line 111 in FIG. 1(b). For example, in FIG. 2(a), the port P1 is the power feed part of the microstrip transmission line 200, and corresponds to the power feed part 103 in FIG. 1(b). The port P4 is the power feed part of the microstrip transmission line 201, and corresponds to the power feed part 112 in FIG. 1(b). The port P2 is the terminal part of the microstrip transmission line 200, and corresponds to the terminal part 104 in FIG. 1(b). The port P3 is the terminal part of the microstrip transmission line 201, and corresponds to the terminal part 114 in FIG. 1(b).

[0024] Next, the case of the isolation state of FIG. 1(a) will be described. In that case, for example, the microstrip transmission line 200 of FIG. 2(a) corresponds to the transmission line 101 of FIG. 1(a), and the microstrip transmission line 201 of FIG. 2(a) corresponds to the transmission line 111 of FIG. 1(a). For example, in FIG. 2(a), the port P2 is a power feed part of the microstrip transmission line 200, and corresponds to the power feed part 103 of FIG. 1(a). The port P4 is a power feed part of the microstrip transmission line 201, and corresponds to the power feed part 112 of FIG. 1(a). The port P1 is a terminal part of the microstrip transmission line 200, and corresponds to the terminal part 104 of FIG. 1(a). The port P3 is a terminal part of the microstrip transmission line 201, and corresponds to the terminal part 114 of FIG. 1(a).

[0025] The horizontal axis of Fig. 2(b) represents frequency, and the vertical axis of Fig. 2(b) represents power ratio in dB (dimensionless). Focusing on the frequency band range of 20 GHz to 30 GHz, the change range of power ratio S41 in graph 220 is approximately 3.5 dB, while the change range of power ratio S42 in graph 221 is approximately 19 dB.

[0026] As is clear from this result, when considering a wireless communication device 100 that enables wideband data transmission, the transfer characteristic of the power ratio S41 in the graph 220 is superior to the transfer characteristic of the power ratio S42 in the graph 221. In other words, it was shown that the coupling state in Fig. 1(b) is more desirable than the isolation state in Fig. 1(a).

[0027] 2(a) has a symmetrical structure, the power ratio S32 transmitted from port P2 to port P3 has a property close to the power ratio S41. Furthermore, the power ratio S31 transmitted from port P1 to port P3 has a property close to the power ratio S42.

[0028] Fig. 3 is a diagram showing a configuration example of microstrip transmission lines 300 and 301 according to the first embodiment. For example, the microstrip transmission line 300 corresponds to the transmission line 101 in Fig. 1(a) and (b), and the microstrip transmission line 301 corresponds to the transmission line 111 in Fig. 1(a) and (b). Fig. 1(a) and (b) show an example of differential signal transmission, but single-ended signal transmission may also be used.

[0029] The microstrip transmission line 300 has a linear electrode 305 provided on one surface (top surface) of the substrate, and a ground electrode 306 provided on the entire surface (bottom surface) of the substrate. The ground electrode 306 is a reference potential surface of the conductor.

[0030] Microstrip transmission line 301 has patterned electrodes 302-304 provided on one surface (lower surface) of the substrate, and a ground electrode 307 provided on the entire surface (upper surface) of the substrate. Ground electrode 307 is a reference potential surface of a conductor.

[0031] The microstrip transmission line 300 has ports P1 and P2. The port P1 is a connection portion and is provided at one end of the electrode 305. The port P2 is a connection portion and is provided at the other end of the electrode 305.

[0032] The microstrip transmission line 301 has ports P3 and P4. The port P3 is a connection portion and is provided at an end of the electrode 302. The port P4 is a connection portion and is provided at an end of the electrode 304.

[0033] In the case of differential signal transmission, two electrodes 305 are provided, and two sets of electrodes 302 to 304 are also provided. For example, ports P1 of the two electrodes 305 are connected to the differential buffer 102 of FIGS. 1(a) and (b). Ports P2 of the two electrodes 305 are connected to each other via a termination resistor. For example, port P4 of the two electrodes 304 is connected to the receiving circuit 113. A termination resistor is connected between port P3 of the two electrodes 302 and the ground electrode 307.

[0034] 1(a) and 1(b) serves as a buffer, and for example, the buffer is connected to port P1 of electrode 305, and a termination resistor is connected between port P2 of electrode 305 and ground electrode 306. Also, for example, receiving circuit 113 of FIG. 1(a) and 1(b) receives a single-ended signal from port P4 of electrode 304, and a termination resistor is connected between port P3 of electrode 302 and ground electrode 307.

[0035] Microstrip transmission line 300 formed on a substrate and microstrip transmission line 301 formed on a substrate are arranged in close proximity to each other and are coupled to each other by a magnetic field, an electric field, or both a magnetic field and an electric field.

[0036] The microstrip transmission line 301 formed on the substrate has a characteristic shape. The shape of the microstrip transmission line 301 will be explained by dividing it into its constituent elements. The microstrip transmission line 301 is roughly divided into three electrodes 302 to 304.

[0037] That is, the microstrip transmission line 301 has electrodes 302 and 304 formed approximately parallel to the electrode 305 of the microstrip transmission line 300. Furthermore, the microstrip transmission line 301 has an electrode 303 formed so as to straddle the microstrip transmission line 300 when the microstrip transmission line 301 is viewed from above. The length of the electrode 305 is longer than the length of the electrode 302 and the length of the electrode 304. The electrode 305 is disposed at a position where the electrodes 302, 303, and 304 are projected to at least partially overlap with each other when the microstrip transmission line 301 is viewed from above.

[0038] The electrode 303 is connected to the vicinity of the tip portions of the electrodes 302 and 304, respectively, and connects the electrodes 302 and 304. Here, it is desirable to form the electrodes 302 and 304 so that their lengths are substantially equal. In this case, the effect of this embodiment can be obtained significantly.

[0039] Ports P1 to P4 each indicate the position of an excitation port in an electromagnetic field simulator.

[0040] Fig. 4 is a graph showing the results of electromagnetic field analysis of the simulation model of Fig. 3. Graph 410 shows the power ratio S41 of the power transmitted from port P1 to port P4. Graph 411 shows the power ratio S42 of the power transmitted from port P2 to port P4.

[0041] The power ratio S41 of the graph 410 is the transfer characteristic in the coupling state of Fig. 1(b) described above, while the power ratio S42 of the graph 411 is the transfer characteristic in the isolation state of Fig. 1(a) described above.

[0042] First, the case of the coupling state in FIG. 1(b) will be described. In that case, for example, the microstrip transmission line 300 in FIG. 3 corresponds to the transmission line 101 in FIG. 1(b), and the microstrip transmission line 301 in FIG. 3 corresponds to the transmission line 111 in FIG. 1(b). For example, in FIG. 3, the port P1 is a power feed part of the microstrip transmission line 300, and corresponds to the power feed part 103 in FIG. 1(b). The port P4 is a power feed part of the microstrip transmission line 301, and corresponds to the power feed part 112 in FIG. 1(b). The port P2 is a terminal part of the microstrip transmission line 300, and corresponds to the terminal part 104 in FIG. 1(b). The port P3 is a terminal part of the microstrip transmission line 301, and corresponds to the terminal part 114 in FIG. 1(b).

[0043] Next, the case of the isolation state in FIG. 1(a) will be described. In that case, for example, the microstrip transmission line 300 in FIG. 3 corresponds to the transmission line 101 in FIG. 1(a), and the microstrip transmission line 301 in FIG. 3 corresponds to the transmission line 111 in FIG. 1(a). For example, in FIG. 3, the port P2 is a power feed part of the microstrip transmission line 300, and corresponds to the power feed part 103 in FIG. 1(a). The port P4 is a power feed part of the microstrip transmission line 301, and corresponds to the power feed part 112 in FIG. 1(a). The port P1 is a terminal part of the microstrip transmission line 300, and corresponds to the terminal part 104 in FIG. 1(a). The port P3 is a terminal part of the microstrip transmission line 301, and corresponds to the terminal part 114 in FIG. 1(a).

[0044] The horizontal axis of Fig. 4 indicates frequency, and the vertical axis of Fig. 4 indicates power ratio in dB (dimensionless). Focusing on the frequency band range of 20 GHz to 30 GHz, the change range of power ratio S41 in graph 410 and the change range of power ratio S42 in graph 411 are approximately 5 dB or less. This change range is considered to be sufficient performance as a transfer characteristic that enables wideband data transmission.

[0045] Comparing the power ratio S42 of the graph 411 in FIG. 4 with the power ratio S42 of the graph 221 in FIG. 2(b), the change in the power ratio in the range of 20 GHz to 30 GHz differs by about 50 times in true value terms.

[0046] From the above results, it is possible to substantially eliminate the distinction between the coupling state in Fig. 1(b) and the isolation state in Fig. 1(a) by using the microstrip transmission line 301 having the characteristic shape in Fig. 3. This makes it possible to obtain a transfer characteristic that enables wideband data transmission.

[0047] It has been shown that the above-mentioned problems can be solved by using the microstrip transmission line 301 having the characteristic shape shown in Fig. 3 due to this electrical property. That is, an electrical signal propagating through one microstrip transmission line 300 can be efficiently received by the other microstrip transmission line 301. In addition, the problem of the existence of a constraint condition between the direction of the electrical signal propagating through the microstrip transmission line 300 and the position of the power supply part of the other microstrip transmission line 301 can be solved.

[0048] According to this embodiment, the relationship between the position of the power feed point of the microstrip transmission line 300 and the position of the power feed point of the microstrip transmission line 301 can be freely selected, so that mechanical layout constraints can be relaxed when considering incorporation into a device. In addition, the above-mentioned effects can be obtained only by relatively simple ingenuity in the pattern shape of the microstrip transmission line 301 formed on the substrate, so this can be said to be a means that contributes to cost reduction and size reduction.

[0049] Up to this point, the explanation has been given with a focus on wideband data transmission from the microstrip transmission line 300 to the microstrip transmission line 301. As is self-evident from the reversibility of the S-parameters S41 and S42, the effect shown in Fig. 4 can also be obtained when considering wideband data transmission from the microstrip transmission line 301 to the microstrip transmission line 300.

[0050] That is, the effect of this embodiment is realized regardless of the transmission direction when transmitting data. That is, the microstrip transmission line 300 may be connected to either the differential buffer 102 or the receiving circuit 113. Similarly, the microstrip transmission line 301 may be connected to either the differential buffer 102 or the receiving circuit 113. Any of the ports P1 to P4 shown in FIG. 3 can be connected to the differential buffer 102 or the receiving circuit 113.

[0051] For example, port P1 inputs a signal transmitted by the microstrip transmission line 300 from the differential buffer 102, port P2 is connected to a termination resistor, port P4 outputs a signal received by the microstrip transmission line 301 to the receiving circuit 113, and port P3 is connected to another termination resistor. Alternatively, port P2 may input a signal transmitted by the microstrip transmission line 300 from the differential buffer 102, port P1 is connected to a termination resistor, port P4 outputs a signal received by the microstrip transmission line 301 to the receiving circuit 113, and port P3 is connected to another termination resistor.

[0052] Also, the port P4 may input a signal transmitted by the microstrip transmission line 301 from the differential buffer 102, the port P3 may be connected to a termination resistor, the port P1 may output a signal received by the microstrip transmission line 300 to the receiving circuit 113, and the port P2 may be connected to another termination resistor. Also, the port P3 may input a signal transmitted by the microstrip transmission line 301 from the differential buffer 102, the port P4 may be connected to a termination resistor, the port P1 may output a signal received by the microstrip transmission line 300 to the receiving circuit 113, and the port P2 may be connected to another termination resistor.

[0053] In addition, port P4 may input a signal transmitted by the microstrip transmission line 301 from the differential buffer 102, port P3 may be connected to a termination resistor, port P1 may output a signal received by the microstrip transmission line 300 to a certain receiving circuit 113, and port P2 may output a signal received by the microstrip transmission line 300 to another receiving circuit 113.

[0054] Second embodiment 5(a) is a diagram showing an example of the shape of the microstrip transmission line 301 in FIG. 3, and is the shape of the microstrip transmission line 301 whose effect was confirmed in the first embodiment. The microstrip transmission line 301 has electrodes 302 to 304. The power supply portion 320 is provided near the end of the electrode 302. The termination portion 321 is provided near the end of the electrode 304. The length of the electrode 304 and the length of the electrode 302 are equal to each other and symmetrical.

[0055] Fig. 5(b) is a diagram showing an example of the shape of the microstrip transmission line 301 according to the second embodiment. The microstrip transmission line 301 has electrodes 303, 501, and 502. The power supply unit 320 is provided near the end of the electrode 502. The termination unit 321 is provided near the end of the electrode 501. The length of the electrode 501 and the length of the electrode 502 are different from each other and are asymmetric. The microstrip transmission line 301 in Fig. 5(b) exhibits the same effects as the first embodiment.

[0056] However, when comparing the degree of effect of each shape of Fig. 5(a) and Fig. 5(b), the shape shown in Fig. 5(a) has a greater effect than the shape shown in Fig. 5(b). In other words, it is desirable to form the lengths of the electrodes 302 and 304 to be approximately equal to each other.

[0057] 5(a) and 5(b) have shapes that extend only in the left direction with electrode 303 as the center. Therefore, power supply unit 320 and termination unit 321 are present only on the left side with electrode 303 as the center. In order to realize the effects provided by the first embodiment, as described above, power supply unit 320 and termination unit 321 need to be present in only one direction with the line corresponding to electrode 303 as the center.

[0058] 5(c) is a diagram showing an example of the shape of a microstrip transmission line 510. The shape of the microstrip transmission line 510 is an example of a shape that does not exhibit the effect provided by the first embodiment. The shape of the microstrip transmission line 510 will be explained by dividing it into its components.

[0059] The shape of the microstrip transmission line 510 is roughly divided into three electrodes 503 to 505. The microstrip transmission line 510 has electrodes 503 and 505 formed substantially in parallel. The microstrip transmission line 510 further has an electrode 504. The electrode 504 is connected to the vicinity of the tip portions of the electrodes 503 and 505, respectively. The shape of FIG. 5(c) has a shape extending leftward and rightward with the electrode 504 at the center.

[0060] Power supply section 506 is provided near the end of electrode 505. Termination section 507 is provided near the end of electrode 503. Power supply section 506 and termination section 507 are located on both the left and right sides of electrode 504. The shape in FIG. 5(c) is an example of a shape that does not exhibit the effect provided by the first embodiment.

[0061] In Fig. 5(a), electrodes 302 and 304 extend substantially parallel to each other in the same direction (for example, to the left) from electrode 303. Also, in Fig. 5(a), power supply section 320 and terminal section 321 are connection sections, and are provided at ends where electrodes 302 and 304 extend from electrode 303 in the same direction. Also, in Fig. 5(a), electrodes 302 to 304 are U-shaped, and the length of electrode 302 and the length of electrode 304 are substantially equal to each other.

[0062] In Fig. 5(b), electrodes 501 and 502 extend substantially parallel to each other in the same direction (for example, to the left) from electrode 303. Also, in Fig. 5(b), power supply section 320 and termination section 321 are connection sections, and are provided at ends where electrodes 502 and 501 extend in the same direction from electrode 303. Also, in Fig. 5(b), the length of electrode 501 and the length of electrode 502 are different from each other.

[0063] (Third embodiment) Fig. 6 is a diagram showing an example of the configuration of three microstrip transmission lines 300, 301, and 601 according to the third embodiment, which is an example of the configuration for transmitting data between a plurality of transmission lines. Fig. 6 is obtained by adding a microstrip transmission line 601 to Fig. 3.

[0064] Ports P1 to P6 indicate the positions of excitation ports, respectively. Here, the microstrip transmission line 601 has the same configuration as the microstrip transmission line 301. Like the microstrip transmission line 301, the microstrip transmission line 601 has electrodes 302 to 304 and a ground electrode 307.

[0065] Furthermore, the microstrip transmission line 601 has ports P5 and P6. The port P5 is a connection part and is provided at an end of the electrode 302 of the microstrip transmission line 601. The port P6 is a connection part and is provided at an end of the electrode 304 of the microstrip transmission line 601.

[0066] The microstrip transmission line 300 formed on the substrate and the microstrip transmission line 601 formed on the substrate are arranged in close proximity to each other and are coupled to each other by a magnetic field, an electric field, or both a magnetic field and an electric field.

[0067] For example, ports P1 and P2 are connected to different termination resistors, port P4 outputs a signal transmitted by the microstrip transmission line 301 to the differential buffer 102, port P3 is connected to another termination resistor, port P5 outputs a signal received by the microstrip transmission line 601 to the receiving circuit 113, and port P6 is further connected to another termination resistor. This embodiment can be applied to differential signal transmission and single-ended signal transmission, similar to the first embodiment.

[0068] With this configuration, the microstrip transmission lines 300, 301, and 601 can transmit data in a wide band between each other. In the third embodiment, like the first embodiment, any of the ports P1 to P6 can be connected to the differential buffer 102 or the receiving circuit 113. Furthermore, due to the effect of the first embodiment, it is possible to obtain a transfer characteristic that enables wideband data transmission between any of the ports P1 to P6.

[0069] The total number of microstrip transmission lines corresponding to the microstrip transmission lines 301 and 601 is not limited to two.

[0070] Although the present embodiment has been described using a microstrip transmission line, it can be realized with any type of transmission line (line having characteristic impedance). For example, it can be realized with a coplanar transmission line, a slot transmission line, a strip line, etc., and the method of configuring the transmission line does not impede the effect (concept) of the present embodiment.

[0071] As described above, according to the first to third embodiments, it is possible to provide a wireless communication device 100 that transmits data between closely opposing transmission lines that are coupled by a magnetic field, an electric field, or both a magnetic field and an electric field. The wireless communication device 100 can freely select the relationship of the position of the power supply part of one transmission line with respect to the direction of an electric signal propagating through the other transmission line.

[0072] It should be noted that the above-described embodiments are merely illustrative of specific examples of implementing the present disclosure, and the technical scope of the present disclosure should not be interpreted as being limited by these embodiments. In other words, the present disclosure can be implemented in various forms without departing from its technical concept or main features.

[0073] The disclosure of this embodiment includes the following configuration. (Configuration 1) A communication device having a first transmission line, The first transmission line includes: A first electrode; a second electrode substantially parallel to the first electrode; a third electrode connecting the first electrode and the second electrode; A communication device, wherein the first electrode and the second electrode extend from the third electrode in the same direction and generally parallel to each other. (Configuration 2) 2. The communication device according to claim 1, wherein the first electrode, the second electrode, and the third electrode are U-shaped. (Configuration 3) 3. The communication device according to configuration 1 or 2, wherein a length of the first electrode and a length of the second electrode are substantially equal to each other. (Configuration 4) 2. The communication device according to configuration 1, wherein the first electrode and the second electrode have different lengths. (Configuration 5) The first transmission line includes: a first connection portion provided at an end of the first electrode; and a second connection portion provided at an end of the second electrode, The communication device according to any one of configurations 1 to 4, characterized in that the first connection portion and the second connection portion are provided at ends where the first electrode and the second electrode extend in the same direction from the third electrode. (Configuration 6) the first connection portion outputs a signal received by the first transmission line; 6. The communication device according to configuration 5, wherein the second connection portion is connected to a first termination resistor. (Configuration 7) the first connection portion receives a signal transmitted by the first transmission line; 6. The communication device according to configuration 5, wherein the second connection portion is connected to a first termination resistor. (Configuration 8) the first transmission line is a first microstrip transmission line having a first reference potential plane of a conductor; the first electrode, the second electrode, and the third electrode are provided on one surface of a first substrate; 8. The communication device according to any one of configurations 1 to 7, wherein the first reference potential surface is provided on the other surface of the first substrate. (Configuration 9) the communication device further comprises a second transmission line; The communication device according to any one of configurations 1 to 8, wherein the second transmission line has a fourth electrode and is coupled to the first transmission line by a magnetic field, an electric field, or both a magnetic field and an electric field. (Configuration 10) 10. The communication device according to configuration 9, wherein the fourth electrode is substantially parallel to the first electrode and the second electrode. (Configuration 11) 11. The communication device according to configuration 10, wherein the length of the fourth electrode is longer than the length of the first electrode and the length of the second electrode. (Configuration 12) The communication device according to any one of configurations 9 to 11, wherein the fourth electrode is arranged at a position where the first electrode, the second electrode, and the third electrode are projected so as to overlap at least partially. (Configuration 13) The first transmission line includes: a first connection portion provided at an end of the first electrode; and a second connection portion provided at an end of the second electrode, The second transmission line includes: a third connection portion provided at one end of the fourth electrode; 13. The communication device according to any one of configurations 9 to 12, further comprising a fourth connection portion provided on the other end of the fourth electrode. (Configuration 14) the first connection portion outputs a signal received by the first transmission line; the second connection portion is connected to a first termination resistor; the third connection portion receives a signal transmitted by the second transmission line; 14. The communication device according to configuration 13, wherein the fourth connection portion is connected to a second termination resistor. (Configuration 15) the first connection portion receives a signal transmitted by the first transmission line; the second connection portion is connected to a first termination resistor; the third connection portion outputs a signal received by the second transmission line; 14. The communication device according to configuration 13, wherein the fourth connection portion is connected to a second termination resistor. (Configuration 16) the first connection portion receives a signal transmitted by the first transmission line; the second connection portion is connected to a first termination resistor; 14. The communication device according to configuration 13, wherein the third connection portion and the fourth connection portion each output a signal received by the second transmission line. (Configuration 17) the second transmission line is a second microstrip transmission line having a second reference potential surface of a conductor; the fourth electrode is provided on one surface of a second substrate, 17. The communication device according to any one of configurations 9 to 16, wherein the second reference potential plane is provided on the other surface of the second substrate. (Configuration 18) the communication device further includes a third transmission line coupled to the second transmission line by a magnetic field, an electric field, or both a magnetic field and an electric field; The third transmission line includes: A fifth electrode; and a sixth electrode substantially parallel to the fifth electrode; a seventh electrode connecting the fifth electrode and the sixth electrode; 18. The communication device according to any one of configurations 9 to 17, wherein the fifth electrode and the sixth electrode extend from the seventh electrode in the same direction and generally parallel to each other. (Configuration 19) The first transmission line includes: a first connection portion provided at an end of the first electrode; and a second connection portion provided at an end of the second electrode, The second transmission line includes: a third connection portion provided at one end of the fourth electrode; a fourth connection portion provided at the other end of the fourth electrode, The third transmission line includes: a fifth connection portion provided at an end of the fifth electrode; 19. The communication device according to configuration 18, further comprising a sixth connection portion provided at an end of the sixth electrode. (Configuration 20) the first connection portion receives a signal transmitted by the first transmission line; the second connection portion is connected to a first termination resistor; the third connection portion is connected to a second termination resistor; the fourth connection portion is connected to a third termination resistor; the fifth connection portion outputs a signal received by the third transmission line; 20. The communication device according to configuration 19, wherein the sixth connection portion is connected to a fourth termination resistor. [Explanation of symbols]

[0074] 102 differential buffer, 105 transmit signal source, 103, 112, 320, 506 power supply, 104, 114, 321, 507 termination, 101, 111 transmission line, 113 receiving circuit, 200, 201, 300, 301, 601 microstrip transmission line

Claims

1. A communication device having a first transmission line, The first transmission line includes: A first electrode; a second electrode substantially parallel to the first electrode; a third electrode connecting the first electrode and the second electrode; A communication device, wherein the first electrode and the second electrode extend from the third electrode in the same direction and generally parallel to each other.

2. The communication device according to claim 1 , wherein the first electrode, the second electrode, and the third electrode are U-shaped.

3. 2. The communication device according to claim 1, wherein the first electrode and the second electrode have a length substantially equal to each other.

4. 2. The communication device according to claim 1, wherein the first electrode and the second electrode have different lengths.

5. The first transmission line includes: a first connection portion provided at an end of the first electrode; a second connection portion provided at an end of the second electrode, 2. The communication device according to claim 1, wherein the first connection portion and the second connection portion are provided at ends where the first electrode and the second electrode extend in the same direction from the third electrode.

6. the first connection portion outputs a signal received by the first transmission line; 6. The communication device according to claim 5, wherein the second connection portion is connected to a first termination resistor.

7. the first connection portion receives a signal transmitted by the first transmission line; 6. The communication device according to claim 5, wherein the second connection portion is connected to a first termination resistor.

8. the first transmission line is a first microstrip transmission line having a first reference potential surface of a conductor; the first electrode, the second electrode, and the third electrode are provided on one surface of a first substrate; 2. The communication device according to claim 1, wherein the first reference potential plane is provided on the other surface of the first substrate.

9. The communication device further includes a second transmission line; 2. The communication device according to claim 1, wherein the second transmission line has a fourth electrode and is coupled to the first transmission line by a magnetic field, an electric field, or both a magnetic field and an electric field.

10. The communication device according to claim 9 , wherein the fourth electrode is substantially parallel to the first electrode and the second electrode.

11. 11. The communication device according to claim 10, wherein the length of the fourth electrode is longer than the length of the first electrode and the length of the second electrode.

12. The communication device according to claim 9 , wherein the fourth electrode is disposed at a position where the first electrode, the second electrode, and the third electrode are projected so as to overlap at least a portion of each other.

13. The first transmission line includes: a first connection portion provided at an end of the first electrode; a second connection portion provided at an end of the second electrode, The second transmission line includes: a third connection portion provided at one end of the fourth electrode; 10. The communication device according to claim 9, further comprising a fourth connection portion provided at the other end of the fourth electrode.

14. the first connection portion outputs a signal received by the first transmission line; the second connection portion is connected to a first termination resistor; the third connection portion receives a signal transmitted by the second transmission line; 14. The communication device according to claim 13, wherein the fourth connection portion is connected to a second termination resistor.

15. the first connection portion receives a signal transmitted by the first transmission line; the second connection portion is connected to a first termination resistor; the third connection portion outputs a signal received by the second transmission line; 14. The communication device according to claim 13, wherein the fourth connection portion is connected to a second termination resistor.

16. the first connection portion receives a signal transmitted by the first transmission line; the second connection portion is connected to a first termination resistor; 14. The communication device according to claim 13, wherein the third connection portion and the fourth connection portion each output a signal received by the second transmission line.

17. the second transmission line is a second microstrip transmission line having a second reference potential surface of a conductor; the fourth electrode is provided on one surface of a second substrate, The communication device according to claim 9 , wherein the second reference potential plane is provided on the other surface of the second substrate.

18. the communication device further includes a third transmission line coupled to the second transmission line by a magnetic field, an electric field, or both a magnetic field and an electric field; The third transmission line includes: A fifth electrode; and a sixth electrode substantially parallel to the fifth electrode; a seventh electrode connecting the fifth electrode and the sixth electrode; 10. The communication device according to claim 9, wherein the fifth electrode and the sixth electrode extend from the seventh electrode in the same direction and generally parallel to each other.

19. The first transmission line includes: a first connection portion provided at an end of the first electrode; a second connection portion provided at an end of the second electrode, The second transmission line includes: a third connection portion provided at one end of the fourth electrode; a fourth connection portion provided at the other end of the fourth electrode, The third transmission line includes: a fifth connection portion provided at an end of the fifth electrode; 20. The communication device according to claim 18, further comprising a sixth connection portion provided at an end of the sixth electrode.

20. the first connection portion receives a signal transmitted by the first transmission line; the second connection portion is connected to a first termination resistor; the third connection portion is connected to a second termination resistor; the fourth connection portion is connected to a third termination resistor; the fifth connection portion outputs a signal received by the third transmission line; 20. The communication device according to claim 19, wherein the sixth connection portion is connected to a fourth termination resistor.

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