Wireless communication device and wireless system

Abstract

The invention relates to a wireless communication device and a wireless system. A receiving apparatus receives a signal by coupling with an electromagnetic field of another communication apparatus, and the receiving apparatus includes: a coupling conductor including two electrodes; the circuit element part is arranged between the two electrodes and comprises a high-pass filter and a resistor; the cut-off frequency of the high-pass filter is lower than the self-resonant frequency of the coupling conductor.

Description

Technical Field

[0001] The present invention relates to a wireless communication device and a wireless communication system for wirelessly transmitting signals. Background Art

[0002] In recent years, near-field communication systems that communicate between multiple proximity electrodes through electromagnetic field coupling have been studied and developed. Replacing wired connections that use connectors and wiring harnesses to communicate with circuit substrates or modules with wireless connections can reduce the number of parts in the connection part and simplify the manufacturing process of the device. Japanese Patent Application Laid-Open No. 2021-168491 discusses a wireless communication device that includes a transmitter and a receiver applied to a rotating part. The wireless communication device performs wireless communication between electrodes through electromagnetic field coupling.

[0003] In the wireless communication device discussed in Japanese Patent Application Laid-Open No. 2021-168491, a receiver resistor with sufficiently high resistance is placed between the receiver electrodes to achieve a passband that does not attenuate the lowest frequency components of the data. However, in the configuration discussed in Japanese Patent Application Laid-Open No. 2021-168491, self-resonance occurs due to the parasitic capacitance and inductance components of each electrode at high frequencies. For example, when high-speed wireless communication is performed using frequency components near the self-resonant frequency, the influence of self-resonance can degrade data. Summary of the Invention

[0004] The present invention is directed to providing a wireless communication device that can prevent self-resonance due to parasitic components of electrodes and that enables high-speed data transmission.

[0005] According to one aspect of the present invention, a wireless communication device is provided, comprising: a receiving device, configured to receive a differential signal through electromagnetic field coupling with other communication devices, wherein the receiving device comprises: a coupling conductor, comprising two electrodes, the two electrodes being configured to receive the differential signal through the electromagnetic field coupling; a circuit element portion, arranged between the two electrodes and comprising at least one high-pass filter and a resistor; and a receiving circuit, the receiving circuit being connected to the coupling conductor, wherein a cutoff frequency of the at least one high-pass filter is lower than a self-resonant frequency of the coupling conductor.

[0006] Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figures 1A to 1Care diagrams each illustrating a configuration example of a wireless communication system according to a first exemplary embodiment.

[0008] Figures 2A to 2C are graphs each indicating a simulation result of the wireless communication system according to the first exemplary embodiment.

[0009] Figures 3A to 3C are graphs each indicating a simulation result regarding the impedance of a coupling system connected to a receiving device according to the first exemplary embodiment.

[0010] Figure 4A is a diagram illustrating a configuration example of a receiving device according to the first exemplary embodiment. Figure 4B is a graph indicating the simulation results of the receiving device.

[0011] Figure 5A and Figure 5B are diagrams each illustrating another configuration example of the receiving apparatus according to the first exemplary embodiment. Figure 5C is a graph indicating the simulation results of the receiving device.

[0012] Figure 6A and Figure 6B are diagrams illustrating examples of filter configurations regarding a receiving device and a circuit element portion, respectively, according to the second exemplary embodiment. Figure 6C is a graph indicating simulation results of the filter configuration of the receiving device and the circuit element section.

[0013] Figure 7A is a diagram of a configuration example of a receiving device according to the third exemplary embodiment. Figure 7B and Figure 7C Graphs respectively indicate simulation results of the correction circuit and the wireless communication device.

[0014] Figures 8A to 8C are diagrams each illustrating a configuration example of a coupling conductor. DETAILED DESCRIPTION

[0015] A first exemplary embodiment of the present invention will be described below with reference to the accompanying drawings. Figure 1A 1 is a diagram illustrating a configuration example of a wireless communication system 100 according to this exemplary embodiment. Wireless communication system 100 includes a transmission device 10 and a reception device 20, and performs wireless communication. Transmission device 10 includes a coupling conductor 101, a terminal resistor 104, and a transmission circuit 105. Reception device 20 includes a coupling conductor 201, circuit element portions 204 and 205, a resistor 206, and a reception circuit 207.

[0016] The coupling conductor 101 includes electrodes 102 and 103 , and the coupling conductor 201 includes electrodes 202 and 203 .

[0017] The configuration of the transmission device 10 will be described below. The transmission circuit 105 in the transmission device 10 inputs a transmission signal to the coupling conductor 101. The transmission signal input to the coupling conductor 101 can be a signal modulated by a carrier wave, or it can be a baseband signal without modulation. In the present invention, the transmission of the baseband signal without modulation will be described. The transmission signal transmitted from the transmission circuit 105 is a differential signal. The transmission signal can be a binary digital signal encoded by a code such as 8B / 10B, or it can be a multi-base signal such as a ternary or higher-base signal. One end of each of the two electrodes (electrodes 102 and 103) is connected to the output part of the transmission circuit 105, and the other end of each of the two electrodes is terminated by a resistor having an impedance roughly equal to the differential impedance of the coupling conductor 101. Therefore, the signal is transmitted in the direction from the transmission circuit 105 to the terminal resistor 104.

[0018] The coupling conductor 101 may be formed on a substrate or formed of a plate, etc. The coupling conductor 101 may have a ground (GND) conductor as a reference potential for applying a signal to the electrodes 102 and 103 .

[0019] The configuration of the receiving device 20 will be described below. Figure 1B This diagram illustrates the details of receiving device 20 in wireless communication system 100, as viewed from the surface through which receiving device 20 is coupled to coupling conductor 101. Coupling conductor 201 is formed on dielectric substrate 212. Circuit element section 204 includes a circuit in which filter 208 and resistor 209 are connected in series, and circuit element section 205 includes a circuit in which filter 210 and resistor 211 are connected in series. Coupling conductor 201 is connected to receiving circuit 207 via a signal line from the end of coupling conductor 101 closest to the end connected to terminating resistor 104.

[0020] The coupling conductor 201 includes electrodes 202 and 203. The coupling conductor 101 in the transmission device 10 and the coupling conductor 201 in the reception device 20 are disposed close to each other so as to be opposed to each other, and function as a coupler that couples by an electromagnetic field. Figure 1C 1 is a cross-sectional view showing a state in which the coupling conductor 101 in the transmission device 10 and the coupling conductor 201 in the reception device 20 are facing each other in the wireless communication system 100. Figure 1C As shown in FIG, electrodes 102 and 202 are arranged to face each other, and electrodes 103 and 203 are arranged to face each other. A coupling conductor 101 is formed on a dielectric substrate 106. A distance d is the distance between the coupling conductors 101 and 201 in the Z-axis direction.

[0021] In response to the differential signal output from the transmission circuit 105, differential signals of opposite phases are input to the electrodes 102 and 103, and differential signals of opposite phases are output to the electrodes 202 and 203. The output differential signals are input to the reception circuit 207.

[0022] Figure 1B Filters 208 and 210 in FIG. 1 have high-pass filter characteristics. A high-pass filter has the following characteristics: at frequencies below the high-pass filter's cutoff frequency, the impedance is very high, and at frequencies above the cutoff frequency, the impedance is very low. In other words, a high-pass filter allows signals with frequencies above the cutoff frequency to pass.

[0023] Therefore, circuit element portions 204 and 205 have very high impedance at frequencies below the cutoff frequency, and have the impedance of resistors 209 and 211 at frequencies above the cutoff frequency. The impedance of resistors 209 and 211 is set as the impedance of the coupling system, as will be described below. With this configuration, the impedance of coupling conductor 201 matches the impedance of resistors 209 and 211 at frequencies above the cutoff frequency, and the influence of self-resonance caused by parasitic components of coupling conductor 201 is suppressed.

[0024] Since the impedance matches the impedance of the resistors 209 and 211 , the occurrence of standing waves will be suppressed, thereby allowing the length of each of the electrodes 202 and 203 in the Y-axis direction to be set to a specific value.

[0025] The resistor 206 in the receiving device 20 is connected to the transmission path between the coupling conductor 201 and the receiving circuit 207. The resistor 206 is set to a high impedance of 1 kΩ or higher. By setting the impedance value of the resistor 206 to be high, the impedance of the resistor 206 is set to be higher than the impedance of the capacitance component generated by the coupling of the coupling conductors 101 and 201 not only in the high frequency range but also in the low frequency range. With this configuration, the low-frequency transmission signal is also transmitted to the receiving circuit 207. Therefore, in the case where the signal transmitted from the coupling conductor 101 is a rectangular wave signal, the signal input from the coupling conductor 201 to the receiving circuit 207 has a substantially rectangular waveform. In the receiving circuit

[0026] In the case where the input impedance of 207 is much higher than the impedance of the capacitive component generated by coupling and the impedance of resistors 209 and 211 at the lowest frequency of the transmission signal, resistor 206 can be omitted.

[0027] Receiving circuit 207 shapes or amplifies the signal transmitted from coupling conductor 201 and outputs the resulting signal to the subsequent circuit. Examples of configurations for signal shaping include emitter follower circuits and differential amplifier circuits. If the signal transmitted from coupling conductor 201 can be processed similarly to the received signal, the shaping function can be omitted.

[0028] Figure 2A Pictured Figures 1A to 1C 1 and 2. Transmission characteristics of the coupled conductors 101 and 201 in the configuration of the wireless communication system 100 shown in FIG. Figure 2B and Figure 2C The following diagrams illustrate simulation results of eye patterns of signals input to the receiving circuit 207. The diagrams illustrate simulation results for a case where the circuit element sections 204 and 205 are disposed and simulation results for a case where the circuit element sections 204 and 205 are not disposed. These simulation results were obtained when the distance d between the coupling conductors 101 and 201 was set to 2 millimeters (mm).

[0029] In the simulation, Figure 1A and Figure 1B The resistance value of resistor 206 is set to 22 kilo-ohms (kΩ). The resistance value can be lower than 22 kΩ as long as the resistance value is set to be higher than the impedance of the capacitive component caused by the coupling of coupling conductors 101 and 201 at the lowest frequency f1 of the transmission signal. Capacitors are arranged as filters (high-pass filters) 208 and 210 in circuit element sections 204 and 205, respectively. In the simulation, the value of each capacitor is set to 0.4 pF. When the self-resonant frequency caused by the parasitic component of coupling conductor 201 is fp, the cutoff frequency fc of each of high-pass filters 208 and 210 is set to a value that satisfies the following expression (1).

[0030] F1≤F C ≤F P (1)

[0031] In other words, the cutoff frequency of each of high-pass filters 208 and 210 can be set to any value as long as the cutoff frequency is within a range from greater than or equal to the lowest frequency of the transmitted signal to less than or equal to the self-resonant frequency. For example, in the case of a 10 Gbps baseband signal using 8b / 10b encoding and transmitted from coupling conductor 101 via electrode 102, the number of consecutive bits as the lowest frequency of the transmitted signal in the present invention is, for example, a maximum of 5 bits. Since the base frequency is 5 gigahertz (GHz), the lowest frequency is set to 1 GHz, that is, one-fifth of 5 GHz. The lowest frequency varies depending on the speed of the signal to be transmitted, the encoding method, the bit error rate value set in the system, and the like.

[0032] Figure 2A The diagram shows simulation results indicating the transmission characteristics of a differential signal transmitted from coupling conductor 101 to coupling conductor 201. The horizontal axis indicates frequency, while the vertical axis indicates the transmission amount. Dashed line 220 indicates the transmission characteristics when circuit element sections 204 and 205 are not arranged. Solid line 221 indicates the transmission characteristics when circuit element sections 204 and 205 are arranged. Dashed line 220 shows a peak at around 7 GHz. This is due to the self-resonance caused by the presence of parasitic components of coupling conductor 201. The results show that the self-resonance frequency of coupling conductor 201 is approximately 7 GHz. In contrast, solid line 221 shows that the peak is suppressed. This is because circuit element sections 204 and 205 function as resistors 209 and 211, respectively, and their impedances match the impedances of resistors 209 and 211 in the high-frequency range. Figure 2B The diagram shows an eye pattern of a signal input to the receiving circuit 207 when a serial signal is transmitted at 10 gigabits per second (Gbps) in a case where the circuit element sections 204 and 205 are not arranged. Figure 2C The diagram shows an eye pattern when a serial signal is transmitted at 10 Gbps with the circuit element portions 204 and 205 arranged. Figure 2C The eye opening can be observed, which means that the waveform distortion has been improved.

[0033] The following will refer to Figures 3A to 3C The impedance of the coupling system is described, that is, the values ​​of the resistors 209 and 211. The impedance of the coupling system mentioned herein is the matching impedance of the coupling conductor 201 on the receiving side when the coupling conductor 101 on the transmission side and the coupling conductor 201 on the receiving side are opposed to each other. Figure 3A The graph shows the reflection characteristics when the impedance of the resistors 209 and 211 changes at each distance d between the coupled conductors 101 and 201. The impedance at the lowest point in each graph is the impedance of the coupled system. In other words, when the distance d is 1 mm, the impedance of the coupled system (Zoc1) is approximately 160 Ω, when the distance d is 2 mm, the impedance of the coupled system (Zoc2) is approximately 200 Ω, and when the distance d is 3 mm, the impedance of the coupled system (Zoc1) is approximately 160 Ω.

[0034] The impedance of (Zoc3) is about 220Ω, and when the distance d is 4 mm, the impedance of the coupled system (Zoc4) is about 220Ω. Figure 3A The figure also illustrates the reflection characteristics of the coupling conductor 201 alone when the coupling conductor 201 and the coupling conductor 101 are not opposite to each other. Figure 3A It is shown that the characteristic impedance (Zo) of the coupling conductor 201 alone is approximately 220Ω, which is roughly equal to Zoc3 and Zoc4. Figure 3Bis a graph showing the relationship between distance d and coupling system impedance. It can be observed that as distance d decreases, the difference between the characteristic impedance and the coupling system impedance increases. This is because the coupling strength between coupling conductor 201 and coupling conductor 101 increases.

[0035] Figure 3C The diagram shows simulation results indicating the transmission characteristics of the differential signal in the process of being transmitted from the coupling conductor 101 to the coupling conductor 201 in response to the impedance change of the resistors 209 and 211. The distance d between the coupling conductor 201 and the coupling conductor 101 is 2 mm, which is similar to Figure 2A The dashed line 220 and the solid line 221 are related to the simulation conditions shown in FIG. Figure 2A The dotted lines and solid lines in the dotted line graph are similar. The transmission characteristics indicated by the light gray solid line 222 are the transmission characteristics when the impedance of the resistors 209 and 211 is half the impedance of the coupled system, and the transmission characteristics indicated by the gray solid line 223 are the transmission characteristics when the impedance of the resistors 209 and 211 is twice the impedance of the coupled system. Figure 3C This shows that, compared to a case where the circuit element sections 204 and 205 are not arranged, the peak value is suppressed even when the impedance of the resistors 209 and 211 slightly deviates from the coupling system impedance. In other words, even when the impedance of the resistors 209 and 211 is set within a range from a value greater than or equal to half the coupling system impedance to a value less than or equal to twice the coupling system impedance, the effect of suppressing the peak value is observed.

[0036] Figure 1B Each of filters 208 and 210 shown in FIG is preferably a filter whose cutoff frequency includes the fundamental frequency component of the passed signal. Specifically, when a 10 Gbps baseband signal is transmitted from coupling conductor 101 via electrode 102, a 5 GHz frequency component is the fundamental frequency component. Therefore, as high-pass filters 208 and 210, filters having characteristics that include at least a 5 GHz frequency component in the passband are arranged.

[0037] In the present exemplary embodiment, the coupling conductor 201 is connected to the receiving circuit 207 via a signal line from one end close to the end of the coupling conductor 101 connected to the terminating resistor 104. Even in the case where the coupling conductor 201 is connected to the receiving circuit 207 via a signal line from the other end close to the other end of the coupling conductor 101 connected to the transmission circuit 105, a similar effect of suppressing the peak can be obtained. Figure 4A A configuration is illustrated in which the coupling conductor 201 is connected to the receiving circuit 207 via a signal line from the other end close to the other end of the coupling conductor 101 connected to the transmission circuit 105 . Figure 4B Illustration about Figure 4AThe dashed line 220 and the solid line 221 are the transmission characteristics of the configuration shown in FIG. Figure 2A The dashed and solid lines in the graph are similar, and the transmission characteristic indicated by the light gray solid line 224 is Figure 4A The transmission characteristics in the configuration shown in . It can be observed from line 224 that the peak is suppressed compared to the case of the dotted line 220 .

[0038] Although the configuration in which the circuit element portions 204 and 205 are arranged at each end of the coupling conductor 201 is described in the present exemplary embodiment, the circuit element portion may be arranged at one of the two ends.

[0039] Figure 5A and Figure 5B This is a configuration diagram in the case where a circuit element portion is arranged at one of the two ends.

[0040] Figure 5C Illustration about Figure 5A and Figure 5B The dashed line 220 and the solid line 221 are the transmission characteristics of the configuration shown in FIG. Figure 2A The dashed and solid lines in the graph are similar, and the transmission characteristic indicated by the light gray solid line 225 is Figure 5A The transmission characteristic in the configuration shown in FIG, and the transmission characteristic indicated by the gray solid line 226 is Figure 5B It can be observed from lines 225 and 226 that the peak is suppressed compared to the case of the dotted line 220.

[0041] In the first exemplary embodiment, a configuration including circuit element sections 204 and 205 each including a series circuit including a filter and a resistor is described. In the second exemplary embodiment, another high-pass filter configuration will be described.

[0042] Figure 6A and Figure 6B The high-pass filter circuit configurations of the present exemplary embodiment, including the receiving device 20 and the circuit element sections 204 and 205, are shown. The transmission device 10 and the method of transmitting a signal are similar to those of the first exemplary embodiment. Regarding the receiving device 20, components similar to those of the first exemplary embodiment are denoted by the same reference numerals, and redundant descriptions will be omitted.

[0043] exist Figure 6A In FIG. 1 , the circuit element parts 204 and 205 respectively include two high-pass filters.

[0044] Figure 6BThe diagram shows an example of a circuit configuration for high-pass filters 208, 210, 213, and 214. Each of the high-pass filters 208, 210, 213, and 214 includes capacitors 215 and 216, an inductor 217, and a resistor 218. Although this is a configuration of a second order Chebyshev filter, as long as each of the high-pass filters 208, 210, 213, and 214 has a high-pass filter function, the filter order and filter type are not particularly limited. For example, the filter type may be a Bessel filter, a Gaussian filter, or a Butterworth filter. In addition to passive components, each of the high-pass filters 208, 210, 213, and 214 may also include other elements. In Figure 6A and Figure 6B In FIG. 2 , resistor 218 in high-pass filter 210 is connected to resistor 218 in high-pass filter 214. This is because inductor 217 requires a portion at an intermediate potential for its function. When transmitting low-frequency signals, the impedance of inductor 217 is low, resulting in a short circuit, which causes an impedance imbalance in circuit element sections 204 and 205. Resistor 218 is provided to eliminate this imbalance.

[0045] Figure 6C The diagram shows the instructions Figure 6A and Figure 6B Figure 2 shows simulation results of the transmission characteristics of a differential signal transmitted from coupling conductor 101 to coupling conductor 201 in the configuration shown in FIG. In the simulation, the capacitance of each of capacitors 215 and 216 was set to 0.43 pF, the inductance of inductor 217 was set to 4.6 nH, and the resistance of resistor 218 was set to 50Ω. The abscissa indicates frequency, and the ordinate indicates the transmission amount.

[0046] The transmission characteristic indicated by the solid line 227 is obtained when the Figure 6B The transmission characteristics of the high-pass filters 208, 210, 213 and 214 are shown in FIG. The dotted line 220 and the solid line 221 are Figure 2A The dashed and solid lines in the graph are similar. It can be observed that in this exemplary embodiment, the peak that previously appeared around 7 GHz on dashed line 220 is also suppressed. Comparing line 227 with line 221 shows that the transmission capacity is greater in the case of the transmission characteristics indicated by line 227. In this way, by using a second-order Chebyshev filter configuration, the transmission capacity can be increased.

[0047] In the third exemplary embodiment, a configuration in the case where a correction circuit is further connected in a subsequent stage of the reception circuit 207 will be described. Figure 7AThis is a configuration diagram in the case where a correction circuit 219 is connected in a subsequent stage to the receiving circuit 207. The transmission device 10 and the method of transmitting a signal are similar to those in the first exemplary embodiment. With respect to the receiving device 20, components similar to those in the first exemplary embodiment are denoted by the same reference numerals, and redundant descriptions will be omitted.

[0048] exist Figure 7A In the embodiment, the correction circuit 219 is connected to the output portion of the receiving circuit 207 used in the second exemplary embodiment. Figure 7B The figure shows the frequency characteristics of the correction circuit 219. The abscissa indicates the frequency, and the ordinate indicates the transmission amount. The correction circuit 219 has a characteristic that the transmission amount increases in the case of the frequency characteristics of the lower the frequency range. Figure 7C The figure shows the simulation results of the transmission characteristics of the differential signal during the transmission process from the coupling conductor 101 to the coupling conductor 201. The horizontal axis indicates the frequency, and the vertical axis indicates the transmission amount. The transmission characteristics indicated by the solid line 228 are the transmission characteristics when the correction circuit 219 is connected. It can be seen that the difference between the peak value of the frequency characteristics in the low frequency range and the peak value of the frequency characteristics is suppressed compared with the frequency characteristics indicated by the line 221. This is because the frequency components in the low frequency range are composed of the components with Figure 7B The frequency characteristics shown in the correction circuit 219 are enhanced.

[0049] Correction circuit 219 may be interchangeable with reception circuit 207 or may be built into reception circuit 207. Furthermore, the frequency characteristics of correction circuit 219 are not limited to those of this exemplary embodiment and may be selected according to the application. For example, the frequency characteristics may attenuate the frequency characteristics in the high frequency range or may enhance the frequency characteristics near a specific frequency.

[0050] The coupling method of the coupling conductors 101 and 201 in the first to third exemplary embodiments can be implemented by electric field coupling, magnetic field coupling, or both. The transmitting device 10 can be moved or the receiving device 20 can be moved as long as the electrodes 102 and 202 face each other and the electrodes 103 and 203 face each other.

[0051] In the first to third exemplary embodiments, the configuration in which the shape of each of the coupling conductors 101 and 201 is a rectangular parallelepiped is described.

[0052] The shape of each of the coupling conductors 101 and 201 is not limited to a rectangular parallelepiped, but may be a shape other than a rectangular parallelepiped as long as the electrodes 102 and 202 face each other and the electrodes 103 and 203 face each other. For example, each of the coupling conductors 101 and 201 may have a shape such as Figure 8A The shape with rounded corners shown in Figure 8B The oval shape shown in or Figure 8C In the case where the width of each of the coupling conductors 101 and 201 in the X-axis direction is non-uniform, the layout positions of the circuit element portions 204 and 205 are determined, and thereafter the optimum matching impedance is set as the impedance of the coupling system.

[0053] The disclosure of the present exemplary embodiment includes the following configurations.

[0054] (Configuration 1)

[0055] A wireless communication device, comprising:

[0056] a receiving device configured to receive a differential signal by electromagnetic field coupling with another communication device,

[0057] Wherein, the receiving device includes:

[0058] a coupling conductor comprising two electrodes, wherein the two electrodes are configured to receive the differential signal through the electromagnetic field coupling;

[0059] a circuit element portion arranged between the two electrodes and including at least one high-pass filter and a resistor; and

[0060] a receiving circuit connected to the coupling conductor, and

[0061] Wherein, a cut-off frequency of the at least one high-pass filter is lower than a self-resonant frequency of the coupling conductor.

[0062] (Configuration 2)

[0063] The wireless communication apparatus according to Configuration 1, wherein the at least one high-pass filter includes at least one capacitor.

[0064] (Configuration 3)

[0065] The wireless communication apparatus according to configuration 1 or 2, wherein the cutoff frequency of the at least one high-pass filter is a lowest frequency of the differential signal or higher.

[0066] (Configuration 4)

[0067] The wireless communication device according to any one of Configurations 1 to 3, wherein the circuit element portion is connected to at least one end of the two electrodes.

[0068] (Configuration 5)

[0069] The wireless communication device according to any one of Configurations 1 to 3, wherein the circuit element section is connected to one end of one of the two electrodes and one end of the other of the two electrodes.

[0070] (Configuration 6)

[0071] The wireless communication device according to any one of configurations 1 to 4, wherein the at least one high-pass filter in the circuit element portion is connected to at least one end of one of the two electrodes, and the resistor is connected to at least one end of the other of the two electrodes.

[0072] (Configuration 7)

[0073] The wireless communication device according to any one of Configurations 1 to 6, wherein a resistance value of the resistor is greater than or equal to half an impedance value of a coupling system of the coupling conductor and less than or equal to twice a characteristic impedance value of the coupling conductor.

[0074] (Configuration 8)

[0075] The wireless communication apparatus according to any one of Configurations 1 to 7, wherein the at least one high pass filter is a Chebyshev filter.

[0076] (Configuration 9)

[0077] The wireless communication apparatus according to any one of configurations 1 to 8, wherein a correction circuit is connected to an output portion of the receiving circuit.

[0078] (Configuration 10)

[0079] The wireless communication device according to any one of claims 1 to 9, wherein each electrode in the coupling conductor has a rectangular parallelepiped shape.

[0080] (Configuration 11)

[0081] A wireless communication system, comprising:

[0082] a transmission device configured to transmit a differential signal;

[0083] a receiving device configured to receive the differential signal through electromagnetic field coupling with the transmitting device,

[0084] Wherein, the receiving device includes:

[0085] a coupling conductor comprising two electrodes, wherein the two electrodes are configured to receive the differential signal through the electromagnetic field coupling;

[0086] a circuit element portion arranged between the two electrodes and including at least one high-pass filter and a resistor; and

[0087] a receiving circuit connected to the coupling conductor, and

[0088] Wherein, a cut-off frequency of the at least one high-pass filter is lower than a self-resonant frequency of the coupling conductor.

[0089] (Configuration 12)

[0090] The wireless communication system according to configuration 11,

[0091] Wherein, the transmission device comprises two electrodes, and

[0092] Wherein, the two electrodes are configured to transmit the differential signal.

[0093] While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.The following claims are to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims

1. A wireless communication device, comprising: a receiving device configured to receive the differential signal by electromagnetic field coupling with another communication device, Wherein, the receiving device includes: a coupling conductor comprising two electrodes, wherein the two electrodes are configured to receive the differential signal through the electromagnetic field coupling; a circuit element portion arranged between the two electrodes and including at least one high-pass filter and a resistor; and a receiving circuit connected to the coupling conductor, and Wherein, a cut-off frequency of the at least one high-pass filter is lower than a self-resonant frequency of the coupling conductor.

2. The wireless communication device according to claim 1, wherein The at least one high pass filter comprises at least one capacitor.

3. The wireless communication device according to claim 1, wherein The cutoff frequency of the at least one high-pass filter is the lowest frequency of the differential signal or higher. The wireless communication device according to claim 1 , wherein: The circuit element portion is connected to at least one end of the two electrodes. The wireless communication device according to claim 1 , wherein: The circuit element portion is connected to one end of one of the two electrodes and one end of the other of the two electrodes. The wireless communication device according to claim 1 , wherein: The at least one high-pass filter in the circuit element portion is connected to at least one end of one of the two electrodes, and the resistor is connected to at least one end of the other of the two electrodes.

7. The wireless communication device according to claim 1, wherein The resistance value of the resistor is greater than or equal to half of the impedance value of the coupling system of the coupling conductor and less than or equal to twice the characteristic impedance value of the coupling conductor.

8. The wireless communication device according to claim 1, wherein The at least one high pass filter is a Chebyshev filter.

9. The wireless communication device according to claim 1, wherein The correction circuit is connected to the output portion of the receiving circuit.

10. The wireless communication device according to claim 1, wherein Each electrode in the coupling conductor has a rectangular parallelepiped shape.

11. A wireless communication system, comprising: a transmission device configured to transmit a differential signal; a receiving device configured to receive the differential signal through electromagnetic field coupling with the transmitting device, Wherein, the receiving device includes: a coupling conductor comprising two electrodes, wherein the two electrodes are configured to receive the differential signal through the electromagnetic field coupling; a circuit element portion arranged between the two electrodes and including at least one high-pass filter and a resistor; and a receiving circuit connected to the coupling conductor, and Wherein, a cut-off frequency of the at least one high-pass filter is lower than a self-resonant frequency of the coupling conductor.

12. The wireless communication system according to claim 11, in, The transmission device includes two electrodes, and wherein the two electrodes are configured to transmit the differential signal.

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