Wireless transmission system, control method, and program

Abstract

To prevent communication instability with a simple configuration when transmitting a differential signal using a first transmission line coupler having a gap and a second transmission line coupler opposing the first transmission line in a non-contact manner.SOLUTION: A wireless transmission system has a second transmission line coupler 111 of such a size that, when an input signal to a first transmission line coupler 101 is transmitted to a position where the first transmission line coupler 101 and the second transmission line coupler 111 are coupled in an electric field and / or a magnetic field, a signal width of a first signal generated by the second transmission line coupler 111 at rising and falling edges of the input signal to the first transmission line coupler 101 is approximately equal to or greater than the difference in transmission delays of gaps of the first transmission line coupler 101.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a wireless transmission system including a movable transmission line. [Background technology]

[0002] In recent years, technology has been developed to control devices with rotating movable parts, such as robot hands and network cameras, by communication via a network, etc. Devices with such rotating movable parts can be configured to perform data communication via the rotating part to solve problems such as cables getting tangled in the shaft when the rotating movable part is rotated.

[0003] Patent Document 1 describes a configuration in which an electrical signal is input from one end of a ring-shaped first transmission line, terminated at the other end, and detected from a second transmission line opposite the first end. Here, when an electrical signal is input from the first end of the first transmission line and transmitted to the second end, a timing difference occurs between the first and second ends of the electrical signal. That is, due to a transmission delay in the first transmission line, the electrical signal arrives at the second end later than at the first end. As a result, the reception timing of the signal at the second transmission line differs depending on the part of the first transmission line from which the signal is received. In response to this, Patent Document 1 discloses a technology that uses a variable delay device connected to the second transmission line to correct the timing difference of the signal depending on the position of the second transmission line. That is, when the second transmission line is located near the first end of the first transmission line, the delay amount of the variable delay device is increased, and when the second transmission line is located near the second end of the first transmission line, the delay amount is corrected to be reduced.

[0004] However, in Patent Document 1, as shown in FIG. 6(a), the gap between the first end A, which inputs a signal from the first transmission line 101, and the second end B, which terminates the signal, is small. Therefore, the second transmission line 111 can simultaneously face both the first end A and the second end B of the first transmission line 101. FIG. 6(b) shows an edge signal of the input signal detected by the second transmission line 111 (receiving coupler). When the second transmission line 111 moves over the first end A and the second end B of the first transmission line, signals with different timings are combined from the first end A and the second end B of the first transmission line 101, as shown in FIG. 6(b). Therefore, a time jump occurs in the signal output from the second transmission line. If this time jump exceeds the jitter tolerance of the digital circuit, erroneous data may be output.

[0005] To address this problem, Patent Document 2 prevents data loss and enables stable communication by appropriately selecting and switching between multiple transmission-side paths (transmission couplers) and reception-side paths (reception couplers). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 4-45505 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-202415 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the method disclosed in Patent Document 2, the signal of the input channel needs to be routed to N+1 transmission lines via delay units depending on the relative position of the rotating part with respect to the fixed part, which requires a means for detecting the relative position and a switching means for switching the input signal at high speed, resulting in a complex configuration.

[0008] In view of the above, an object of the present invention is to prevent communication instability with a simple configuration when a differential signal is transmitted using a first transmission line coupler having a gap and a second transmission line coupler that faces the first transmission line without contacting the first transmission line. [Means for solving the problem]

[0009] In view of the above-mentioned problems, the present invention discloses a wireless transmission system comprising a pair of signal lines for transmitting differential signals, each of which has a transmitter connected to one end and a termination structure connected to the other end. , the signal line has gaps at one end and the other end. A first transmission line coupler and a pair of signal lines for transmitting differential signals, each of which has a comparator connected to one end and a termination structure connected to the other end. , moving across the gap of the first transmission line coupler a second transmission line coupler, wherein the second transmission line coupler generates a first signal at a rising edge and a falling edge of an input signal to the first transmission line coupler when the input signal is transmitted to a position where the first transmission line coupler and the second transmission line coupler are coupled to each other by an electric field and / or a magnetic field; The signal width of the first signal is equal to or greater than the difference between the rising edge of an input signal input to the first transmission line coupler and the rising edge of an output signal output from a termination structure connected to the first transmission line coupler. It is characterized by:

[0010] Further, a wireless transmission system according to another aspect of the present disclosure is a pair of signal lines for transmitting differential signals, each of which has a transmitter connected to one end and a termination structure connected to the other end. , the signal line has a gap at one end and the other end. and a pair of signal lines for transmitting differential signals, each of which has a comparator connected to one end and a termination structure connected to the other end. The aforementioned and a second transmission line coupler that moves across the gap, and a circuit that suppresses the frequency component of a signal discontinuity that occurs when the second transmission line coupler crosses the gap of the first transmission line coupler and passes the maximum fundamental frequency of the signal input to the first transmission line coupler.

[0011] Also, a wireless transmission system according to another aspect of the present invention includes a first transmission line coupler, which is a pair of signal lines for transmitting differential signals, each of which has a transmitter connected to one end and a termination structure connected to the other end, and a second transmission line coupler, which is a pair of signal lines for transmitting differential signals, each of which has a comparator connected to one end and a termination structure connected to the other end, wherein the second transmission line coupler generates a first signal at a rising edge and a falling edge of an input signal to the first transmission line coupler when the input signal is transmitted to a position where the first transmission line coupler and the second transmission line coupler are coupled to each other by an electric field and / or a magnetic field, and calculates the first signal from a transmission delay amount of the first transmission line coupler. faith a value obtained by subtracting the signal width from the second transmission line coupler is approximately equal to the amount of jitter tolerable in a digital circuit that receives the signal output from the second transmission line coupler, or From the above allowable jitter amount The second transmission line coupler is configured to be small in size. [Effects of the Invention]

[0012] According to the present invention, when a differential signal is transmitted using a first transmission line coupler having a gap and a second transmission line coupler that faces the first transmission line without contacting the first transmission line, it is possible to prevent communication instability with a simple configuration. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram showing a system configuration according to a first embodiment. [Figure 2] FIG. 4 is a diagram showing a timing chart used to determine the size of the receiving coupler 111 in the first embodiment. [Figure 3] 10 is a timing chart showing a case where the receiving coupler 111 in the first embodiment completely blocks the transmitting coupler 101. FIG. [Figure 4] FIG. 10 is a diagram showing a system configuration according to a second embodiment. [Figure 5] FIG. 10 is a diagram showing another system configuration according to the second embodiment. [Figure 6]1A and 1B are diagrams showing a system configuration and a timing chart for explaining a conventional technique. [Figure 7] FIG. 1 is a diagram showing a system configuration for explaining a principle common to each embodiment. [Figure 8] FIG. 10 is a timing chart illustrating a principle common to the embodiments. [Figure 9] FIG. 10 is a diagram showing another system configuration diagram for explaining the principle common to the respective embodiments. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the configurations shown in the following embodiments are merely examples, and the present invention is not limited to the illustrated configurations.

[0015] First, the principle common to each embodiment will be described. Fig. 7 shows a system configuration diagram for explaining the principle common to each embodiment. Transmission line coupler 101 is a transmission line coupler on the transmission side of a differential signal, consisting of a pair of signal lines, and will hereinafter be referred to as a transmission coupler. Data transmitted from a signal source 103 (transmitter) connected to transmission coupler 101 is input to transmission coupler 101 as a differential signal via a differential transmission buffer 104 connected to signal source 103. The end of transmission coupler 101 opposite to the end connected to signal source 103 is terminated by resistor 102, which has approximately the same impedance as the characteristic impedance of the transmission line.

[0016] The transmission line coupler 111 is a transmission line coupler on the receiving side of a differential signal, consisting of a pair of signal lines, and is hereinafter referred to as the receiving coupler. The receiving coupler 111 can move along the transmitting coupler 101. The receiving coupler 111 is coupled to the transmitting coupler 101 by at least one of the effects of an electric field and / or a magnetic field. An input signal input from the signal source 103 passes through the electric field and / or magnetic field coupling between the transmitting coupler 101 and the receiving coupler 111, and is output from one end of the receiving coupler 111 to the comparator 113. The input signal is waveform-shaped by the comparator 113 and detected as a received signal. The other end of the receiving coupler 111 is terminated by a resistor 112 that is approximately equal to the characteristic impedance of the transmission line.

[0017] The transmitting coupler 101 and the receiving coupler 111 operate as directional couplers. In the receiving coupler 111, the end connected to the signal source 103 in the transmitting coupler 101 is called the coupled end, and the other end is called the isolated end.

[0018] Fig. 8 shows a timing chart for explaining the principle common to each embodiment. Fig. 8(A) shows the signal output from signal source 103, i.e., the signal input to the transmitting coupler. Fig. 8(B) shows the signal at the position of transmitting coupler 101 facing receiving coupler 111. Fig. 8(C) shows the signal output from the coupled end when the isolation end of receiving coupler 111 is terminated and the signal is output from the coupled end. Fig. 8(D) shows the signal output by comparator 113.

[0019] In FIG. 8, the signal propagating through the transmitting coupler 101 and the signal detected from the receiving coupler 111 are differential signals, but for simplicity of explanation, they are shown here as the difference signal of the differential signals.

[0020] A signal (A) output from a signal source 103 is input to a transmission coupler 101 via a differential buffer 104. The signal propagating through the transmission coupler 101 propagates at the speed of the transmission mode on the board and is absorbed by a termination resistor 102, which has approximately the same impedance as the characteristic impedance of the transmission coupler 101. If the termination resistor 102 perfectly matches the characteristic impedance of the transmission coupler 101, the signal propagating at the termination will be absorbed by the termination resistor 102 without being reflected.

[0021] In this case, the signal of the transmitting coupler 101 at the position opposite to the receiving coupler 111 becomes a signal (B) delayed by a time Δt1, which is the sum of the delay of the differential buffer 104 and the transmission delay from the input signal.

[0022] Signal (C) detected by receiving coupler 111 rises in response to the rise of signal (B), and then the rising edge is maintained for a time period approximately proportional to the length of the electric field and / or magnetic field coupling between transmitting coupler 101 and receiving coupler 111. In other words, the rising edge is maintained for a time period approximately proportional to the length of receiving coupler 111. Here, the rising edge of the signal is maintained for a time period ton approximately proportional to the length L1 of receiving coupler 111 shown in FIG. 7. Thereafter, signal (C) becomes approximately zero.

[0023] Furthermore, signal (C) falls in response to the falling edge of signal (B), and similarly remains falling for a time period ton. After that, the signal returns to approximately zero.

[0024] The waveform shaping circuit 113 is a circuit that demodulates the input signal from the output signal of the receiving coupler 111. It is generally configured with a comparator that has hysteresis so that it outputs "1" when the signal (C) (edge ​​signal) of the receiving coupler 111 exceeds a positive threshold voltage Vth, and outputs "0" when it falls below a negative threshold voltage -Vth. Hereinafter, the waveform shaping circuit 113 will be referred to as comparator 113.

[0025] Note that signal (C) may contain noise such as reflected waves due to slight impedance discrepancies between the characteristic impedance of transmitting coupler 101 and termination resistor 102, or reflected waves due to mismatching within receiving coupler 111. However, comparator 112 changes only in response to the rising and falling edges of signal (C) as long as these noise signals are within the threshold voltages (Vth, -Vth), and is therefore able to demodulate signal (D) with the same waveform as signal (B).

[0026] 7 and 8, the long transmission line is the transmitting coupler, and the short transmission line that moves along the long transmission line is the receiving coupler, but this is not limited to this. Because directional couplers are reversible, the same system will work even if the transmitting coupler 101 and the receiving coupler 111 are swapped, as shown in Fig. 9. The components included in the system configuration diagram in Fig. 9 correspond to the components with the same numbers included in the system configuration diagram in Fig. 7.

[0027] (First embodiment) The system configuration of the wireless transmission system according to this embodiment is shown in Fig. 1. In the wireless transmission system according to this embodiment, transmitting couplers 101 are arranged in a ring shape on a circumference, and receiving couplers 11 are configured to move on the circumference along with transmitting couplers 101. Furthermore, receiving couplers 111 output signals from their coupled ends.

[0028] When the wireless transmission system according to this embodiment is installed in a device having a rotor, a transmission coupler 101 is arranged on a circumference centered on the rotation axis of the rotor. A reception coupler 111 is also arranged facing the transmission coupler 101 and moving on a circumference centered on the rotation axis of the rotor. The reception coupler 111 may be arranged either outside or inside the rotor. The transmission coupler 101 and the reception coupler 111 transmit signals via electric field and / or magnetic field coupling. Note that, for simplicity of explanation, FIG. 1 omits components such as a substrate supporting the transmission coupler 101 and the reception coupler 111, as well as ground conductors when the transmission coupler 101 and the reception coupler 111 are differential high-frequency transmission lines such as microstrip lines or coplanar lines.

[0029] In FIG. 1, the transmission line coupler 101 is a transmitting coupler and the transmission line coupler 111 is a receiving coupler, but this is not limiting, and the transmission line coupler 101 may be a receiving coupler and the transmission line coupler 111 may be a transmitting coupler.

[0030] The transmitting coupler 101 and the receiving coupler 111 may be configured to be included in the same device, or may be configured to be included in separate devices.

[0031] Furthermore, if the output signal obtained from the receiving coupler 111 is lower than the desired signal level, an amplifier may be inserted between the receiving coupler 111 and the comparator 113 .

[0032] The transmission coupler 101 is a transmission line made up of a pair of conductors and is arranged in a ring shape on the circumference. A gap exists in the transmission coupler 101, and a signal source 103 is connected to one end via a differential buffer 104. A termination resistor 102 is connected to the other end of the transmission coupler 101. The signal output from the signal source 103 is transmitted via the transmission coupler 101 toward the termination resistor 102 and flows into the termination resistor 102.

[0033] The receiving coupler 111 is arranged opposite the transmitting coupler 101 on a circumference having the same center as the circumference on which the transmitting coupler 101 is arranged. The receiving coupler 111 is also a transmission line made up of a pair of conductors, and is configured to be shorter than the transmitting coupler 101. The receiving coupler 111 is arranged so as to be coupled to the transmitting coupler 101 by electric field and / or magnetic field coupling, and is configured to generate a signal based on the electrical signal flowing through the transmitting coupler 101.

[0034] The isolated end of the receiving coupler 111 is terminated by a terminating resistor 112. On the other hand, the coupled end of the receiving coupler 111 is connected to a comparator 113. The comparator 113 shapes the waveform of the signal received by the receiving coupler 111 and transmits it to a digital circuit 114 connected thereto.

[0035] Here, the gap of the transmitting coupler 101 is configured to be smaller than the size of the receiving coupler 111. When the receiving coupler 111 faces the transmitting coupler 101 so as to straddle the gap, the receiving coupler 111 simultaneously couples with the two ends of the transmitting coupler 101 in the electric field and / or magnetic field. In this case, the receiving coupler 111 receives both a signal with almost no delay relative to the input signal input to the transmitting coupler 101, and a signal that is delayed relative to the input signal due to transmission on the transmitting coupler 101. The signal received by the receiving coupler 111 is a signal obtained by combining these two signals according to the coupling ratio between the receiving coupler 111 and the transmission paths at the two ends of the transmitting coupler 101.

[0036] FIG. 2 shows a timing chart used to determine the size of the receiving coupler 111. From top to bottom, FIG. 2(a) shows the waveforms of the input signal V(in) to the transmitting coupler 101, the signal V(term) output at the termination of the transmitting coupler 101, and the output signal at the coupled end of the receiving coupler 111, for each size of the arc of the receiving coupler 111. Here, the waveforms of the output signal are shown when the arc of the receiving coupler 111 is 160 degrees (degrees), 170 degrees, 180 degrees, 190 degrees, and 200 degrees. When the size of the arc of the receiving coupler 111 is 180 degrees or more, the signal width of the output signal from the receiving coupler 111 becomes larger than the delay time of V(term) relative to the input signal to the transmitting coupler 101, and no gaps appear in the output signal from the receiving coupler 111.

[0037] In the receiving coupler 111 of this embodiment, when the size of the arc is between 160° and 180°, the gap in the received signal is 0.1 nS (seconds) or less, so most comparators cannot react, and no gap occurs in the comparator output.

[0038] Here, if the signal being transmitted is, for example, 1 Gbps, its maximum fundamental frequency is 500 MHz. On the other hand, if the discontinuity of the received signal is 0.1 nS, its fundamental frequency component is 5 GHz. In such a case, if an LPF (Low Pass Filter) that passes the fundamental frequency of the signal and suppresses the frequency component of the discontinuity is inserted between the receiving coupler 111 and the comparator 113, the discontinuity will not occur in the output of the comparator 113. For simplicity, a capacitor of about several pF may be inserted in parallel between the outputs of the differential transmission path of the receiving coupler 111 as an LPF to filter the signal. In this case, the discontinuity of the signal will be small, and no discontinuity will occur in the output of the comparator 113 even if the arc size is 180 degrees or less. Similarly, if the maximum frequency to which the comparator 113 can respond is higher than the maximum fundamental frequency of the signal but lower than the frequency component of the discontinuity, no discontinuity will occur in the output of the comparator 113.

[0039] Although the signal may be smoothed by inserting an LPF or adjusting the maximum response frequency of the comparator, a phase shift occurs in the received signal when the receiving coupler 111 moves over the gap of the transmitting coupler 101. This phase shift must not exceed the jitter tolerance of the digital circuit 114 connected to the receiving coupler 111.

[0040] FIG. 2(b) shows a timing chart for when the arc size of the receiving coupler 111 is 180 degrees of the circumference. From top to bottom, the timing chart shows the input signal (A) to the transmitting coupler 101, the signal (B) output at the end of the transmitting coupler 101, the signal (C) output by the receiving coupler 111, and the signal (D) output by the comparator 113. As shown in FIG. 2(b), the signal width ton of the signal (C) is approximately equal to the delay td of the signal (B) relative to the signal (A), so there is no gap in the signal (D). These diagrams show that by appropriately setting the size of the receiving coupler 111, data jumps in the signal output by the comparator 113 are suppressed.

[0041] 3 shows a timing chart when the receiving coupler 111 makes one revolution on the transmitting coupler 101. Fig. 3(a) shows the case where the size of the circular arc of the receiving coupler 111 is 150 degrees, and Fig. 3(b) shows the case where the size of the circular arc of the receiving coupler 111 is 180 degrees.

[0042] Figures 3(a) and (b) show, from top to bottom, the input signal to the transmitting coupler 101, the signal output at the terminal end of the transmitting coupler 101, and the output signal of the receiving coupler 111 for each relative angle between the transmitting coupler 101 and the receiving coupler 111.

[0043] 3(a) shows the waveforms of the output signal from the receiver coupler 111 when the relative angles are -160°, -130°, -100°, -70°, -40°, -10°, and 10°. When the relative angle between the receiver coupler 111 and the transmitter coupler 101 is -130°, the receiver coupler 111 mainly receives signals near the end of the transmitter coupler 101. At this time, the threshold voltages Vth and -Vth of the comparator 113 are reached at rise and fall times affected by the delayed signal (signal at the end) of the transmitter coupler 101. Therefore, the output of the comparator 113 is output as a signal delayed from the input signal to the transmitter coupler 101.

[0044] When the relative angle between receiving coupler 111 and transmitting coupler 101 is -100 degrees, receiving coupler 111 mainly receives signals near the end of transmitting coupler 101 where the signal is input. In this case, the output of comparator 113 is output with almost no influence from the signal (the signal at the termination point) that has been delayed by transmission on transmitting coupler 101. For this reason, when the relative angle between receiving coupler 111 and transmitting coupler 101 changes from -130 degrees to -100 degrees, the signal output by comparator 113 changes from a signal that is affected by the signal that has been delayed by transmission on transmitting coupler 101 to a signal that is not affected. In this case, jumps occur in the timing of the rise and fall of the signal output by comparator 113.

[0045] If the receiving coupler 111 rotates in the opposite direction to the transmitting coupler 101, the relative angle of the receiving coupler 111 to the transmitting coupler 101 will change from -100° to -130°. In this case, the signal output by the comparator 113 will change from a signal that is not affected by the delayed signal as it travels through the transmitting coupler 101 to a signal that is affected, and similarly, jumps will occur in the timing of the rise and fall.

[0046] 3(b) shows the waveform of the output signal from receiver coupler 111 when the relative angle is -190°, -160°, -130°, -100°, -70°, -40°, -10°, and 10°. In FIG. 3(b), the timing at which the threshold Vth and -Vth are exceeded is approximately the same when the relative angle between receiver coupler 111 and transmitter coupler 101 is -130° and -100°. Therefore, even when the relative angle between receiver coupler 111 and transmitter coupler 101 changes from -130° to -100°, no jump occurs in the timing of the rise or fall of the signal output from comparator 113.

[0047] As described above, by configuring the size of receiving coupler 111 so that the signal width of the signal output by receiving coupler 111 is approximately equal to the delay of the output signal at the terminal relative to the input signal to transmitting coupler 101, it is possible to prevent skipping of the signal output by the comparator. This makes it possible to prevent skipping of data on the receiving side.

[0048] (Second embodiment) In the first embodiment, the system configuration shown in FIG. 1 is used, but the present invention is not limited to this, and the size of the receiving coupler may be determined in a similar manner in other system configurations.

[0049] In FIG. 4, a system configuration diagram of a wireless transmission system different from the first embodiment is shown. In FIG. 4, the transmission coupler 101 is disposed on the side surface of a cylinder, and the reception coupler 111 is disposed outside the transmission coupler 101 so as to face the transmission coupler 101. In the case of such a system configuration, similar to the first embodiment, the reception coupler 111 has a size such that the signal width of the output signal of the reception coupler 111 and the delay amount of the output signal at the termination with respect to the input signal to the transmission coupler 101 are substantially equal. Not limited to this, the reception coupler 111 may be configured as a coupler having a size capable of holding a signal for a long time. Note that in the system shown in FIG. 4, since the lengths of the differential transmission lines of the transmission line coupler configured in a cylindrical shape are equal, the phases of the differential transmission lines are more likely to be aligned than in the system of the first embodiment, and reflection at the termination can be reduced.

[0050] In FIG. 5, another system configuration diagram of a wireless transmission system different from the first embodiment is shown. In FIG. 5, different from the system of FIG. 4, the reception coupler 111 is configured to be disposed inside the transmission coupler 101. Similar to FIG. 4, the reception coupler 111 has a size such that the signal width of the output signal of the reception coupler 111 and the delay amount of the output signal at the termination with respect to the input signal to the transmission coupler 101 are substantially equal. Not limited to this, the reception coupler 111 may be configured as a coupler having a size capable of holding a signal for a long time.

[0051] As described above, even when the system configuration as shown in the second embodiment is adopted, by determining the size of the reception coupler 111 in the same manner as in the first embodiment, data skipping can be suppressed.

[0052] Note that in an actual circuit, since the digital circuit 114 has an allowable jitter amount tj, the reception coupler 111 may be configured to have a size such that a skip smaller than the allowable jitter amount tj occurs. That is, it is sufficient that tj < ton - td with respect to the delay amount td of the output signal at the termination with respect to the input signal to the transmission coupler 101 and the signal width ton of the output signal of the reception coupler 111.

[0053] Furthermore, the wireless transmission system disclosed in either the first or second embodiment may also be capable of transmitting power in addition to communicating wireless signals.

[0054] The present invention can also be realized by supplying a program that realizes one or more functions of the above-described embodiments to a system or device via a network or a storage medium, and having one or more processors in the computer of the system or device read and execute the program. It can also be realized by a circuit (e.g., ASIC) that realizes one or more functions. The program may also be provided by recording it on a computer-readable storage medium. [Explanation of symbols]

[0055] 101, 111 Transmission line coupler 102, 112 Termination resistor 103 Signal source 104 Differential Transmit Buffer 113 Comparator 114 Digital Circuits

Claims

1. 1. A wireless transmission system, comprising: a first transmission line coupler which is a pair of signal lines for transmitting differential signals, each of which has a transmitter connected to one end and a termination structure connected to the other end, the first transmission line coupler having gaps between the one end and the other end of the signal lines; a pair of signal lines for transmitting differential signals, each of which has a comparator connected to one end and a termination structure connected to the other end; and a second transmission line coupler that moves across a gap of the first transmission line coupler; the second transmission line coupler generates a first signal at rising and falling edges of an input signal to the first transmission line coupler when the input signal is transmitted to a position where the first transmission line coupler and the second transmission line coupler perform electric field and / or magnetic field coupling; a signal width of the first signal is equal to or greater than a difference between a rising edge of an input signal input to the first transmission line coupler and a rising edge of an output signal output from a termination structure connected to the first transmission line coupler.

2. 2. The wireless transmission system according to claim 1, wherein the first transmission line couplers are arranged in a ring shape.

3. 2. The wireless transmission system according to claim 1, wherein the second transmission line coupler has an arc size of 180 degrees or more and 200 degrees or less.

4. the second transmission line coupler further includes a low pass filter (LPF) connected to the second transmission line coupler, 2. The wireless transmission system according to claim 1, wherein the second transmission line coupler has an arc having a size of 160 degrees or more and less than 180 degrees.

5. 1. A wireless transmission system, comprising: a first transmission line coupler which is a pair of signal lines for transmitting differential signals, each of which has a transmitter connected to one end and a termination structure connected to the other end, the first transmission line coupler having gaps between the one end and the other end of the signal lines; a second transmission line coupler that is a pair of signal lines that transmit differential signals, each of which has a comparator connected to one end and a termination structure connected to the other end, and that moves across the gap of the first transmission line coupler; a circuit for suppressing a frequency component of a signal discontinuity generated when the second transmission line coupler crosses a gap of the first transmission line coupler, and for passing a maximum fundamental frequency of a signal input to the first transmission line coupler.

6. 1. A wireless transmission system, comprising: a first transmission line coupler which is a pair of signal lines for transmitting differential signals, each of which has a transmitter connected to one end and a termination structure connected to the other end; a second transmission line coupler which is a pair of signal lines for transmitting differential signals, each of which is connected to a comparator at one end and a termination structure at the other end; the second transmission line coupler generates a first signal at rising and falling edges of an input signal to the first transmission line coupler when the input signal is transmitted to a position where the first transmission line coupler and the second transmission line coupler perform electric field and / or magnetic field coupling; a second transmission line coupler having a size such that a value obtained by subtracting a signal width of the first signal from a transmission delay amount of the first transmission line coupler is approximately equal to an allowable jitter amount of a digital circuit that receives a signal output from the second transmission line coupler, or is smaller than the allowable jitter amount.

7. 7. The wireless transmission system according to claim 1, wherein the comparator shapes the waveform of an input signal.

8. The wireless transmission system according to any one of claims 1 to 6, characterized in that the comparator performs waveform shaping by switching its output when the input signal is equal to or greater than a first threshold and when the input signal is equal to or less than a second threshold different from the first threshold.

9. 7. The wireless transmission system according to claim 6, wherein, when the second transmission line coupler faces the first transmission line coupler across a gap between one end and the other end of the signal line, the second transmission line coupler receives a signal that is a combination of a signal with no delay relative to the input signal to the first transmission line coupler and a signal that includes a delay due to transmission by the first transmission line coupler relative to the input signal to the first transmission line coupler.

10. a first transmission line coupler which is a pair of signal lines for transmitting differential signals, each of which has a transmitter connected to one end and a termination structure connected to the other end, the first transmission line coupler having gaps between the one end and the other end of the signal lines; a second transmission line coupler that moves across a gap of the first transmission line coupler, the second transmission line coupler being a pair of signal lines that transmit differential signals, each of the signal lines having a comparator connected to one end and a termination structure connected to the other end, the second transmission line coupler comprising: a generating step in which the second transmission line coupler generates a first signal at rising and falling edges of an input signal to the first transmission line coupler when the input signal is transmitted to a position where the first transmission line coupler and the second transmission line coupler perform electric field and / or magnetic field coupling; an input step of inputting the first signal generated in the generating step to the comparator, a signal width of the first signal is equal to or greater than a difference between a rising edge of an input signal input to the first transmission line coupler and a rising edge of an output signal output from a termination structure connected to the first transmission line coupler.

11. a first transmission line coupler which is a pair of signal lines for transmitting differential signals, each of which has a transmitter connected to one end and a termination structure connected to the other end; a second transmission line coupler including a pair of signal lines for transmitting differential signals, each of which has a comparator connected to one end and a termination structure connected to the other end, the second transmission line coupler moving across a gap of the first transmission line coupler and having a circuit that suppresses a frequency component of a discontinuity of a signal generated when the signal line moves across the gap of the first transmission line coupler and passes a maximum fundamental frequency of a signal input to the first transmission line coupler, the method comprising: a generating step in which the second transmission line coupler generates a first signal at rising and falling edges of an input signal to the first transmission line coupler when the input signal is transmitted to a position where the first transmission line coupler and the second transmission line coupler perform electric field and / or magnetic field coupling; an input step of inputting the first signal generated in the generating step to the comparator.

12. a first transmission line coupler which is a pair of signal lines for transmitting differential signals, each of which has a transmitter connected to one end and a termination structure connected to the other end, the first transmission line coupler having gaps between the one end and the other end of the signal lines; a second transmission line coupler that moves across a gap of the first transmission line coupler, the second transmission line coupler being a pair of signal lines that transmit differential signals, each of the signal lines having a comparator connected to one end and a termination structure connected to the other end, the second transmission line coupler comprising: a generating step in which the second transmission line coupler generates a first signal at rising and falling edges of an input signal to the first transmission line coupler when the input signal is transmitted to a position where the first transmission line coupler and the second transmission line coupler perform electric field and / or magnetic field coupling; an input step of inputting the first signal generated in the generating step to the comparator, a value obtained by subtracting the signal width of the first signal from the transmission delay amount of the first transmission line coupler is approximately equal to an allowable jitter amount of a digital circuit that receives the signal output from the second transmission line coupler, or is smaller than the allowable jitter amount.

13. A program for causing a computer to control a wireless transmission system using the control method according to any one of claims 10 to 12.

Images