JP6597112B2 - Input/Output Circuit Characteristic Adjustment Method and Input/Output Circuit Characteristic Adjustment System - Google Patents

Description

The present invention relates to a method for adjusting the characteristics of an input/output circuit and a system for adjusting the characteristics of an input/output circuit.

In some input/output circuits, adjustments are made by varying the shape and structure of the circuit or the values of elements such as variable resistors and variable inductors to adjust the input/output characteristics to the desired specifications. When adjusting such circuits, there are a large number of elements to adjust, and it is not clear from the currently measured characteristics how much adjustment should be made to each element. For this reason, adjustments are often made by relying on the experience and intuition of the adjustment worker. However, with a method that relies on such human resources, it is difficult to perform stable adjustments on an industrial scale. Therefore, an adjustment method that does not depend on the skill level of the worker has been proposed.

For example, Patent Document 1 discloses a method for adjusting the characteristics of an input/output circuit whose characteristics are adjusted using multiple screws, without relying on the skill of the operator. In this method, first, a theoretical model of the input/output circuit characteristics to be adjusted is created. Next, for each specified frequency, the difference between the actual return loss value and the theoretical model is calculated as an error, and the sum of these errors is calculated. Then, screws are selected and adjusted so that the sum of errors becomes small. Specifically, a certain screw is selected and adjusted, and if the sum of errors becomes small, the adjustment of that screw is repeated, and if the sum of errors does not become small, another screw is selected and adjusted. By repeating this operation, the input/output circuit characteristics can be adjusted so that they approach the theoretical model, without relying on the skill of the operator.

Japanese Patent Application Publication No. 6-45801

However, the method of Patent Document 1 can be difficult when adjusting a large number of input/output circuits. One reason for this is the individual differences in the actual input/output circuits. In actual input/output circuits, there is variation in the size tolerances of parts and the positional accuracy during assembly, which results in individual differences. Originally, input/output circuits required adjustment after assembly because even small differences can significantly change the characteristics, and these individual differences have a significant impact on the characteristics. For this reason, it was difficult to adjust a large number of input/output circuits using the same model.

The present invention was made in consideration of the above problems, and aims to provide a method for adjusting the characteristics of input/output circuits that can be easily adjusted without requiring the skilled worker, even if there are individual differences in the input/output circuits.

In order to solve the above problems, in a characteristic adjustment method for an input/output circuit of the present invention, an electromagnetic signal is input to an input/output circuit in which a plurality of resonators are coupled together, the input/output circuit having a resonant frequency adjustment mechanism for adjusting the resonant frequency of each of the resonators, and a coupling adjustment mechanism for adjusting the coupling state between adjacent resonators, a transmission waveform of the input/output circuit is monitored, a reflected waveform of the input/output circuit is monitored, the resonant frequency adjustment mechanism and the coupling adjustment mechanism are adjusted so that the bandwidth of a recess appearing in the reflected waveform corresponding to the resonant frequency of each of the resonators is within a predetermined range, a first coupling adjustment mechanism is selected from the plurality of coupling adjustment mechanisms, and a predetermined amount of adjustment is made to the first coupling adjustment mechanism. If the maximum value of the return loss at the bottom of the recess becomes small, the predetermined amount of adjustment is repeated for the first coupling adjustment mechanism until the characteristics of the input/output circuit satisfy a predetermined standard or the maximum value no longer decreases, and if the maximum value does not become small, the predetermined amount of adjustment is reversed by one time, a second coupling adjustment mechanism is selected, and an adjustment similar to that of the first coupling adjustment mechanism is made.

The advantage of the present invention is that it provides a method for adjusting the characteristics of input/output circuits that can be easily performed without requiring the skilled worker, even if there are individual differences in the input/output circuits.

2 is a flowchart illustrating a first embodiment. 13 is a graph showing an example of a coarse adjustment reflected waveform according to the second embodiment; 13 is a graph showing an example of a fine-tuning reflected waveform according to the second embodiment; 13 is a flowchart illustrating an example of fine adjustment according to the second embodiment. 13 is a graph showing an example of a waveform before fine adjustment according to the second embodiment. 13 is a graph showing an example of a waveform during fine adjustment according to the second embodiment. 13 is a graph showing an example of a waveform after fine adjustment according to the second embodiment. FIG. 13 is a side view illustrating an example of an input/output circuit to be adjusted in the third embodiment. FIG. 13 is a block diagram showing a third embodiment. FIG. 13 is a perspective view showing a specific example of the third embodiment.

Below, an embodiment of the present invention will be described in detail with reference to the drawings. However, the embodiment described below has limitations that are technically preferable for implementing the present invention, but does not limit the scope of the invention to the following. Note that similar components in each drawing are given the same numbers, and descriptions may be omitted.

(First embodiment)
In this embodiment, the present invention is applied to adjusting an input/output circuit in which a plurality of resonators are coupled together, and which has a resonant frequency adjustment mechanism that adjusts the resonant frequency of each resonator, and a coupling adjustment mechanism that adjusts the coupling state of adjacent resonators.

Figure 1 is a flowchart showing how to adjust the input/output circuit.

First, an electromagnetic signal is input to the input/output circuit to be adjusted (S1). Next, the transmission waveform and the reflected waveform of the input/output circuit are monitored (S2). Next, each resonance frequency adjustment mechanism and coupling adjustment mechanism are adjusted so that the band (concave) of the reflected waveform with low return loss is within a specified frequency range (S3). Hereafter, this band with low return loss will be called a concave. In the concaves, there are minimum values (bottoms) corresponding to each resonator, and maximum values (peaks) between the bottoms. It was said that the bottoms correspond to the resonators, but the bottoms may be close to each other, two or more bottoms may merge into one, or the bottoms may be almost flat. For this reason, the number of bottoms does not necessarily match the number of resonators.

Next, at least one of the coupling adjustment mechanisms provided in the resonator is selected (S4). Then, a predetermined amount of adjustment is performed (S5).

Next, it is determined whether the maximum value of return loss at the bottom of the recess has decreased as a result of the adjustment in S5 (S6). If the maximum value has decreased (S6_Yes), the transmission waveform is referenced to determine whether the characteristics have reached the target (S7). If the target has been reached, the adjustment is terminated (S7_Yes). The target characteristics are determined using at least one of the transmission characteristics or the reflection characteristics. On the other hand, if the target has not been reached (S7_No), the process returns to S5 and the same adjustment is repeated until the maximum value stops decreasing or the characteristics reach the target.

On the other hand, if the maximum value does not decrease even after adjusting the selected coupling adjustment mechanism (S6_No), an adjustment is made to return the predetermined adjustment amount (S8). Then, at least one other coupling adjustment mechanism is selected (S9), and an adjustment similar to that of the previously selected coupling adjustment mechanism is made. That is, a predetermined amount of adjustment is made to the newly selected coupling adjustment mechanism (S5), and it is determined whether the maximum value has decreased (S6). Thereafter, as with the adjustment of the previously selected coupling adjustment mechanism, the adjustment is continued while determining whether the target characteristics are satisfied, whether the predetermined amount of adjustment is repeated, or whether another coupling adjustment means is selected. The order in which the coupling adjustment mechanisms are selected may be the order in which the coupling adjustment mechanisms are arranged, or may be random.

By doing this, it is possible to mechanically search for and adjust the coupling adjustment means that are effective in reducing the return loss of the recess. As a result, even if there are individual differences in the input/output circuits, adjustments can be easily made without requiring the skilled worker.

Second Embodiment
In this embodiment, a specific procedure for adjusting the input/output circuit will be described. Broadly speaking, the adjustment is performed in two stages: coarse adjustment and fine adjustment. The degree of difficulty of the coarse adjustment is low and can be performed without requiring skill or special techniques. On the other hand, the degree of difficulty of the fine adjustment is high and it is difficult to perform with general techniques. However, by using this embodiment, it can be easily performed.

First, the coarse adjustment will be described. The coarse adjustment corresponds to S3 in the first embodiment. Figure 2 is a graph showing the reflected waveform of the frequency characteristics. The horizontal axis is frequency, and the vertical axis is return loss.

In coarse tuning, the resonant frequency of each resonator is adjusted first to bring all resonant frequencies within a predetermined coarse tuning frequency range. This coarse tuning frequency range is related to the transmission bandwidth, which is also the target characteristic of the input/output circuit, and is set wider than the frequency range in fine tuning, which will be described later.

The resonant frequency appears as a minimum value (bottom) on the graph. Figure 2(a) shows a state in which one resonant frequency adjustment mechanism is adjusted to bring the resonant frequency of one resonator into the coarse adjustment frequency range. By adjusting the resonant frequency adjustment mechanism, the bottom moves in the horizontal axis (frequency) direction while changing the depth. It is desirable to adjust this bottom so that it is the minimum within the coarse adjustment range.

Figure 2(b) shows the state after the second resonant frequency adjustment was performed following the adjustment in Figure 2(a). Reflecting this, there are two bottoms.

Similarly, the resonant frequency of each resonator is adjusted in sequence, and all the resonant frequencies are concentrated in the coarse adjustment range. Figure 2 (c) shows this state. The collection of bottoms is observed as a concave portion of the reflected waveform (return loss). In addition, in the concave portion, a bottom reflecting the resonant frequency exists, and a maximum value (peak) appears between the bottoms. Here, an example is shown in which there are four bottoms and three peaks. As described in the first embodiment, two or more bottoms may be combined into one, or may become almost flat, so the number of bottoms does not necessarily match the number of resonators. Also, when a certain bottom is being adjusted, another bottom may fall outside the coarse adjustment frequency range. In that case, the resonant frequency adjustment mechanism is adjusted again so that the bottom falls within the coarse adjustment frequency range.

At this point, the coarse adjustment may be terminated, but by performing the following adjustments, fine adjustments will be made easier and the adjustment time can be shortened. At the stage shown in Figure 2(c), the arrangement of the bottoms is irregular, but the coupling adjustment mechanism is used to adjust the arrangement so that the bottoms are as evenly spaced as possible and each bottom is deep (has a small value). Note that which bottom corresponds to which coupling adjustment mechanism is not uniquely determined, as this depends on the design parameters of the input/output circuits and the state of the resonant frequency adjustment. Completion of the coarse adjustment may also be determined using the standards for the transmission waveform that is monitored at the same time.

Next, fine adjustments are described. In this embodiment, adjustments are made to obtain the target characteristics by reducing the return loss at the recesses in the reflected waveform. To achieve this, adjustments are made to lower the maximum value of return loss at the bottom of the recesses.

Figure 3 is a graph showing a reflected waveform to explain the fine adjustment method. Figure 3(a) is a graph showing the reflected waveform at the start of fine adjustment. Note that this is the same as Figure 2(d). Four bottoms B1, B2, B3, B4 and three peaks P1, P2, P3 appear in the recess of the reflected waveform. P3 indicates the maximum return loss value at the bottom of the recess, and this maximum value will be referred to as RLmax_a. The purpose of the adjustment is to reduce this maximum value using the coupling adjustment means.

First, select the coupling adjustment mechanism to be adjusted. Note that it is not necessary to select just one coupling adjustment mechanism. Next, adjust the coupling adjustment mechanism. Each adjustment is performed in a predetermined direction by a predetermined amount.

First, regarding the coupling adjustment direction, the transmitted waveform monitored simultaneously with the reflected waveform is referenced to determine the adjustment direction. It is generally known that the bandwidth of the transmitted waveform and the coupling coefficient are proportional to each other. Therefore, if it is desired to narrow the bandwidth of the transmitted waveform, the coupling adjustment means can be adjusted in the direction of weakening the coupling, and if it is desired to widen the bandwidth, the coupling adjustment means can be adjusted in the direction of strengthening the coupling. Here, an example of adjustment in the direction of narrowing the bandwidth is explained. It is assumed that the target characteristics are set for at least one of the transmission characteristics and the reflection characteristics. Note that the bandwidth standard for the transmission characteristics and the bandwidth standard for the reflection characteristics are generally not the same.

Figure 4 is a flowchart showing the procedure for this adjustment. The adjustment procedure will be explained using Figure 4 and the example of the reflected waveform in Figure 3. First, the transmitted waveform and the reflected waveform are monitored (S101). At this time, the maximum value of the return loss at the bottom of the recess, RLmax, of the reflected waveform is recorded. In many cases, the maximum value is determined by one of the peaks present at the bottom of the recess. In the example of Figure 3, the peak that gives the maximum value in Figure 3(a) at the start of fine adjustment is P3, and the maximum value is RLmax_a.

Next, for example, one coupling adjustment mechanism is selected from among the multiple coupling adjustment mechanisms (S102). The selected coupling adjustment mechanism is then adjusted in a predetermined direction by a predetermined amount (S103). In this case, the adjustment is made in the direction of narrowing the transmission band, so the predetermined direction is the direction of weakening the coupling. Then, it is determined whether this adjustment has reduced RLmax_a (S104). Figure 3(b) shows an example in which the maximum value has decreased from RLmax_a to RLmax_b. Once the maximum value has decreased, it is determined whether the target characteristics have been satisfied (S105). If the target characteristics have been satisfied, the process ends (S105_Yes); if not (S105_No), the same predetermined amount of adjustment is repeated for the same coupling adjustment mechanism (S103-S105).

On the other hand, if the maximum value has not decreased after the specified amount of adjustment (S104_No), the specified amount of adjustment for that one time is returned to its original state (S106), another coupling adjustment mechanism is selected (S107), and adjustments from S103 onwards are performed in the same manner as the previous adjustment.

Here, two examples are described in which the maximum value does not decrease with a specified amount of adjustment. One is a case in which the adjustment results in a change from FIG. 3(b) to FIG. 3(c). In FIG. 3(c), the maximum value increases as the value of P3 increases (the maximum value is RLmax_c). In other words, the maximum value increases as a result of this adjustment. In such a case, the adjustment is undone one time to return to the state of FIG. 3(b), a different coupling adjustment mechanism is selected, and a similar adjustment is performed.

Another example is when an adjustment causes a change from Figure 3(b) to Figure 3(d). In Figure 3(d), P2, which was smaller than P3 in Figure 3(b), becomes larger as a result of the adjustment, and RLmax_b < RLmax_d. In such a case, the adjustment is reversed one time to return to the state before the maximum value increased, a different coupling adjustment mechanism is selected, and a similar adjustment is performed.

In the above fine adjustment, the next bond adjustment means to be adjusted can be selected, for example, sequentially according to the arrangement. Alternatively, it may be selected randomly. However, it is desirable to avoid bias within one cycle.

In addition, the above adjustment process may be performed by, for example, adjusting all of the coupling adjustment means once, with a predetermined number of cycles being defined as one cycle, and if the target is not reached within the specified number of cycles, an error may be detected and the process may be terminated.

If the bottom falls outside the fine adjustment range while fine adjustment is being performed, the resonant frequency adjustment means can be used to bring it back within the fine adjustment range.

The relationship between the above adjustments and the input/output circuit characteristics is shown in the schematic diagrams of Figures 5, 6, and 7. Here, it is assumed that a transmission bandwidth standard is set for the maximum transmission bandwidth value, and a return loss standard is set for the maximum return loss value of the reflected waveform recess. The transmission bandwidth standard can be set, for example, in the frequency range of half-width (bandwidth of -3 dB from the peak value).

In Fig. 5, which shows the state before fine-tuning begins, the transmission waveform is as shown in Fig. 5(a), and the width of the transmission band is wider than the transmission bandwidth standard. The reflected waveform is as shown in Fig. 5(b), and the peak value at the recess is larger than the return loss standard. In Fig. 6, which shows the state during fine-tuning, the transmission waveform is as shown in Fig. 6(a), and the width of the transmission band approaches the transmission bandwidth standard. The reflected waveform is as shown in Fig. 6(b), and although some peak values at the recess are larger than the return loss standard, most are below the standard. After fine-tuning, the transmission bandwidth meets the standard as shown in Fig. 7(a), and all return loss peaks at the recess are below the standard as shown in Fig. 7(b).

As explained above, the above procedure allows automatic selection of the coupling adjustment mechanism that reduces the maximum return loss, and allows effective adjustments to be made to achieve the target. This eliminates the need for skilled operators. Furthermore, adjustments can be made without being affected by individual differences in the input and output circuits.

As described above, according to this embodiment, even if there are individual differences in the input/output circuits, the characteristics of the input/output circuits can be easily adjusted without requiring the skilled worker.

Third Embodiment
In this embodiment, an input/output circuit characteristic adjustment system that adjusts the characteristics of an input/output circuit according to the first or second embodiment will be described.

Figure 8 is a side view showing an example of an input/output circuit to be adjusted. In the input/output circuit 10, multiple resonators are coupled. The input/output circuit 10 has a resonance frequency adjustment mechanism f that adjusts the resonance frequency of each resonator, and a coupling adjustment mechanism c that adjusts the coupling state of adjacent resonators. In the example of Figure 8, there are four resonators, four resonance frequency adjustment mechanisms f, and three coupling adjustment mechanisms. The input/output circuit 10 also has an input terminal 1 and an output terminal 2.

The four resonance frequency adjustment mechanisms f1, f2, f3, and f4 and the three coupling adjustment mechanisms c12, c23, and c34 can each be adjusted in strength by rotating or sliding, for example, like a volume knob. However, other methods may be used as long as they adjust the strength according to the adjustment direction.

Figure 9 is a block diagram showing an input/output circuit characteristic adjustment system 100. The input/output circuit characteristic adjustment system 100 has an adjustment mechanism section 110, a measurement section 120, and a control section 130.

The adjustment mechanism unit 110 has a resonance frequency adjustment mechanism adjuster 111, a coupling adjustment mechanism adjuster 112, and an adjuster transport mechanism 113. The resonance frequency adjustment mechanism adjuster 111 adjusts the resonance frequency adjustment mechanism. The coupling adjustment mechanism adjustment device 112 adjusts the coupling adjustment mechanism. The adjuster transport mechanism 113 transports the coupling adjustment mechanism adjuster 111 and the coupling adjustment mechanism adjuster 112 to a position where the adjustment is performed.

The measurement unit 120 has an input signal generating unit 121, a transmission waveform monitor unit 122, and a reflected waveform monitor unit 123. The input signal generating unit 121 generates an input signal used to adjust the input/output circuit characteristics and outputs it to the input/output circuit to be adjusted. The transmission waveform monitor unit 122 monitors the transmission waveform. The reflected waveform monitor unit 123 monitors the reflected waveform.

The control unit 130 has a maximum return loss detection unit 131, a coupling adjustment mechanism adjustment amount setting unit 132, a coupling adjustment mechanism selection unit 133, and a drive control unit 134. The maximum return loss detection unit 131 detects the maximum value of return loss in a recess that appears in the reflected waveform. The coupling adjustment mechanism adjustment amount setting unit 132 sets the adjustment direction of the coupling adjustment mechanism and the amount of adjustment for one time in fine adjustment. The drive control unit 134 controls the adjustment mechanism transport unit 113, the resonance frequency adjustment mechanism adjuster 111, and the coupling adjustment mechanism adjuster 112. The control unit 130 also performs control such as analysis of the transmitted waveform, analysis of the reflected waveform, and control of the adjustment process.

By configuring as described above, it is possible to adjust the input/output circuit characteristics using the methods of the first and second embodiments.

Figure 10 is a perspective view showing a configuration example of a specific input/output circuit characteristic adjustment system 100. The adjustment mechanism transport means 113 is an orthogonal three-axis robot. The resonance frequency adjustment mechanism adjuster 111 and the coupling adjustment mechanism adjuster 112 are combined into one. This is an example in which the resonance frequency adjustment mechanism f and the coupling adjustment mechanism c of the output circuit 10 can be adjusted by the same operation. The two adjusters 112, 113 can be rotating mechanisms if f and c are, for example, a type that rotates the volume, or can be sliding mechanisms if they are a type that slides.

The measurement unit 120 generates an input signal and monitors the transmitted and reflected waveforms.

The control unit 130 controls the adjustment mechanism unit 110 and the measurement unit 120, and controls the execution of the adjustment process based on the input/output circuit characteristic adjustment method of the first and second embodiments.

As described above, according to this embodiment, it is possible to configure an input/output circuit characteristic adjustment system that automatically adjusts input/output circuit characteristics.

The present invention has been described above using the above-mentioned embodiment as an exemplary example. However, the present invention is not limited to the above-mentioned embodiment. In other words, the present invention can be applied in various aspects that can be understood by a person skilled in the art within the scope of the present invention.

REFERENCE SIGNS LIST 1 input terminal 2 output terminal 10 input/output circuit 100 input/output circuit characteristic adjustment system 110 adjustment mechanism section 111 resonance frequency adjustment mechanism adjuster 112 coupling adjustment mechanism adjuster 113 adjuster transport section 120 measurement section 121 input signal generating section 122 transmission waveform monitor section 123 reflection waveform monitor section 130 control section 131 return loss maximum value detection section 132 coupling adjustment mechanism adjustment amount setting section 133 coupling adjustment mechanism selection section 134 drive control section c coupling adjustment mechanism f resonance frequency adjustment mechanism

Claims (10)

an input/output circuit including a resonant frequency adjusting mechanism for adjusting the resonant frequency of each of the resonators coupled together and a coupling adjusting mechanism for adjusting a coupling state between adjacent resonators;
monitoring a transmission waveform of the input/output circuit;
monitoring a reflected waveform of the input/output circuit;
adjusting the resonance frequency adjusting mechanism and the coupling adjusting mechanism so that the bandwidth of a concave portion appearing in the reflected waveform corresponding to the resonance frequency of each of the resonators is within a predetermined range;
selecting a first coupling adjustment mechanism from among the plurality of coupling adjustment mechanisms;
performing a predetermined amount of adjustment on the first coupling adjustment mechanism;
when the maximum value of the return loss at the bottom of the recess becomes smaller, repeating the adjustment of the predetermined amount for the first coupling adjustment mechanism until the characteristics of the input/output circuit satisfy a predetermined standard or the maximum value no longer decreases;
If the maximum value does not decrease, the adjustment of the predetermined amount is returned by one time, a second coupling adjustment mechanism is selected, and the same adjustment as that of the first coupling adjustment mechanism is performed.
23. A method for adjusting characteristics of an input/output circuit comprising the steps of: The standard of the characteristic is set using at least one of a transmission bandwidth in the transmission waveform, a width of the recess in the reflected waveform, and a level of return loss.
2. The method for adjusting characteristics of an input/output circuit according to claim 1. determining a direction of the adjustment of the predetermined amount based on a transmission bandwidth of a transmission waveform;
3. The method for adjusting characteristics of an input/output circuit according to claim 1 or 2. determining that an adjustment error has occurred when the characteristics do not satisfy the predetermined standard even after the adjustment of the first coupling adjustment mechanism and the adjustment of the second coupling adjustment mechanism are repeated a predetermined number of times;
4. The method for adjusting characteristics of an input/output circuit according to claim 1. a signal input unit for inputting an electromagnetic signal to an input/output circuit having a plurality of resonators coupled together, the input/output circuit including a resonant frequency adjustment mechanism for adjusting the resonant frequency of each of the resonators, and a coupling adjustment mechanism for adjusting a coupling state between adjacent resonators;
a transmission waveform monitor for monitoring a transmission waveform of the input/output circuit;
a reflected waveform monitor for monitoring a reflected waveform of the input/output circuit;
a resonance frequency adjustment mechanism adjustment unit that adjusts the resonance frequency adjustment mechanism;
a coupling adjustment mechanism adjustment unit that adjusts the coupling adjustment mechanism;
a control unit that controls the resonance frequency adjustment mechanism adjustment unit and the coupling adjustment mechanism adjustment unit so that a bandwidth of a concave portion appearing in the reflected waveform corresponding to the resonance frequency of the resonator is within a predetermined range,
The control unit is
adjusting the resonance frequency adjusting mechanism and the coupling adjusting mechanism so that the bandwidth of a concave portion appearing in the reflected waveform corresponding to the resonance frequency of each of the resonators is within a predetermined range;
Detecting a maximum value of return loss at a bottom of the recess;
selecting a first coupling adjustment mechanism from the plurality of coupling adjustment mechanisms;
performing a predetermined amount of adjustment on the first coupling adjustment mechanism;
when the maximum value of the return loss at the bottom of the recess is reduced by adjusting the predetermined amount, controlling the first coupling adjustment mechanism to repeat the adjustment of the predetermined amount until the characteristics of the input/output circuit satisfy a predetermined standard or the maximum value no longer decreases;
When the maximum value does not become smaller by adjusting the predetermined amount, the adjustment of the predetermined amount is returned by one time, and a second coupling adjustment mechanism is selected and controlled to perform the same adjustment as the first coupling adjustment mechanism.
1. An input/output circuit characteristic adjustment system comprising: The control unit sets the standard of the characteristic using at least one of a transmission bandwidth in the transmission waveform, a bandwidth of the recess of the reflected waveform, and a return loss level.
6. The input/output circuit characteristic adjustment system according to claim 5. The control unit sets an adjustment direction of the predetermined amount of adjustment based on a transmission bandwidth of a transmission waveform.
7. The input/output circuit characteristic adjustment system according to claim 5 or 6. inputting an electromagnetic signal to an input/output circuit having a plurality of coupled resonators, the input/output circuit including a resonant frequency adjusting mechanism for adjusting the resonant frequency of each of the resonators, and a coupling adjusting mechanism for adjusting a coupling state between adjacent resonators;
monitoring a transmission waveform of the input/output circuit;
monitoring a reflected waveform of the input/output circuit;
adjusting the resonance frequency adjustment mechanism and the coupling adjustment mechanism so that the bandwidth of a concave portion appearing in the reflected waveform corresponding to the resonance frequency of each of the resonators is within a predetermined range;
selecting a first coupling adjustment mechanism from among the plurality of coupling adjustment mechanisms;
performing a predetermined amount of adjustment on the first coupling adjustment mechanism;
if the maximum value of the return loss at the bottom of the recess becomes smaller, repeating the adjustment of the first coupling adjustment mechanism by the predetermined amount until the characteristics of the input/output circuit satisfy a predetermined standard or the maximum value does not decrease;
if the maximum value is not reduced, returning the adjustment of the predetermined amount by one time, selecting a second coupling adjustment mechanism, and performing an adjustment similar to that of the first coupling adjustment mechanism;
A characteristic adjustment program for an input/output circuit, comprising : 9. The characteristic adjustment program for an input/output circuit according to claim 8, further comprising a step of setting the characteristic standard using at least one of a transmission bandwidth in the transmission waveform, a width of the recess in the reflected waveform, and a return loss level. 10. The input/output circuit characteristic adjustment program according to claim 8, further comprising a step of determining a direction of the predetermined amount of adjustment based on a transmission bandwidth of a transmission waveform.

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