JPH0969803A - Leak signal removing method for circulator and its device, and radio communication equipment using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To selectively remove a leak signal by preparing a control signal, adding the control signal with the leak signal for which a part of first signal is leaked and outputted from a third terminal, and performing the cancel and suppression of leak signal with the control signal. SOLUTION: A part of transmission wave is branched as a branch signal B(f1 ) by a hybrid circuit 106, the level of the amplitude of that signal is adjusted by a variable attenuator 107a and further, its phase is adjusted by a variable attenuator 107b. Afterwards, that signal is outputted to a hybrid circuit 108 as a control signal C(f1 ) and at the circuit 108, a leak signal S(f1 ) inputted through a circulator 104 to the circuit 108 and the signal C(f1 ) are added. In this case, when the signal levels of both signals C(f1 ) and S(f1 ) are equal and their phases are different 180 deg., both signals are mutually canceled. Thus, a signal D(f2 ) passed through the circuit 108 almost becomes a received wave R(f2 ) only and the interference to a receiver 3 caused by the signal S(f1 ) can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leak signal removing method for a circulator, a leak signal removing apparatus for a circulator, and a wireless communication device using the leak signal.
In a wireless communication device or the like in which a circulator is arranged between a transmitter and a receiver, and one antenna is shared between the transmitter and the receiver via the circulator, a leak signal from the circulator can be simply and The present invention relates to a leakage signal removal method for a circulator that removes efficiently, a leakage signal removal device for a circulator, and a wireless communication device using the same.

[0002]

2. Description of the Related Art As a conventional radio communication device, for example, a radio in which a circulator is arranged between a transmitter and a receiver and one antenna is shared by the transmitter and the receiver via the circulator. There is a communication device.

FIG. 10 shows a schematic structure of a radio communication device which shares an antenna with a conventional circulator, and as shown in the figure, a transmitter 1002 and a receiver 1002 are used to share the antenna 1001. The circulator 1004 is inserted between the circulator 1001 and the circulator 1
A filter 1005 is inserted between the output terminal 3 of 004 and the receiver 1003, and a transmitter 1002 and a receiver 1003 are inserted.
It is intended to ensure the isolation (directional separation) characteristic between and.

In the above structure, the transmission wave T (f ₁ ) output from the transmitter 1001 is transmitted by the circulator 100.
4 from the input terminal 1 through the input / output terminal 2 to the antenna 10
01 to be sent. At this time, the transmitted wave T
A part of (f ₁ ) is the input terminal 1 of the circulator 1004.
From the output terminal 3 to the receiver 10
It leaks to the 03 side and becomes a leak signal S (f ₁ ).

On the other hand, the received wave R (f ₂ ) received by the antenna 1001 is output from the input / output terminal 2 of the circulator 1004 to the receiver 1003 side via the output terminal 3. Therefore, if transmission and reception are performed simultaneously,
From the output terminal 3 of the circulator 1004, the received wave R
(F ₂ ) and the leak signal S (f ₁ ) described above are output.

The received wave R (f ₂ ) + leakage signal S (f ₁ ) output from the output terminal 3 of the circulator 1004 is
The frequency of the received wave R (f ₂ ) and the leaked signal S (f ₁ ) (that is, the transmitted wave T (f ₁ )) is input to the filter 1005, and the leaked signal S (f ₁ ) is received. R (f
₂ ) After being reduced to a level less than
Input to 3. As a result, the receiver 1003 minimizes the influence of the leakage signal S (f ₁ ) and reduces the reception wave R
(F ₂ ) can be selectively received.

On the other hand, a wireless communication means using a wireless communication device is becoming more and more important as a communication means such as a car telephone system. However, in order to effectively use limited channel resources, a channel frequency interval is changed year by year. It is becoming narrower and many radio waves with similar frequencies are mixed. For example, a car telephone system has about 870
A large number of channels are set in the frequency band of MHz to 1000 MHz, and a large number of channel frequencies of the MCA system are set in the vicinity thereof. In addition, when performing these services at the same time, there is no choice but to install a plurality of wireless communication devices close to each other, and this tendency is remarkable especially in a large city.

[0008]

However, according to the radio communication device in which the antenna is shared by using the above-mentioned conventional circulator, the filter is arranged to remove the leakage signal of the circulator. However, when the frequency used for transmission and reception approaches,
Since the received signal is reduced together with the leakage signal, only the leakage signal cannot be removed, which is not practical.

For this reason, there is also a problem that a conventional radio communication device which shares an antenna with a circulator cannot use adjacent frequencies for transmission and reception.

The present invention has been made in view of the above, and it is an object of the present invention to selectively remove only a leak signal of a circulator.

Further, the present invention has been made in view of the above, and an object of the present invention is to make it possible to use adjacent frequencies for transmission and reception in a radio communication device which shares an antenna via a circulator. To do.

[0012]

In order to achieve the above-mentioned object, a leakage signal removing method for a circulator according to a first aspect of the present invention is provided with a first terminal for inputting a first signal and the first terminal. While outputting the first signal input from the terminal,
In a three-terminal circulator having a second terminal for inputting a second signal and a third terminal for outputting the second signal input from the second terminal, A step of branching a part of the first signal input to the terminal, a step of adjusting the amplitude and phase of the branch signal of the first signal to create an adjustment signal, the adjustment signal and the first signal A part of the leakage signal is combined with the leakage signal output from the third terminal, and the adjustment signal cancels and suppresses the leakage signal.

A leakage signal removing device for a circulator according to a second aspect of the present invention outputs a first terminal for inputting a first signal and a first signal input from the first terminal, and In a three-terminal circulator having a second terminal for inputting a second signal and a third terminal for outputting the second signal input from the second terminal, A signal distribution circuit that branches a part of the first signal input to the terminal, and an amplitude and a phase of a branch signal of the first signal that is branched by the signal distribution circuit,
An adjustment signal generation circuit for generating an adjustment signal and an adjustment signal adjusted by the adjustment signal generation circuit are combined with a leakage signal output from a third terminal due to leakage of a part of the first signal. And a signal synthesis circuit.

According to a third aspect of the present invention, there is provided a leakage signal removing device for a circulator, wherein the adjusting signal generating circuit adjusts the amplitude of the branched signal of the first signal branched by the signal distribution circuit, And a variable phase shifter that adjusts the phase of the branched signal of the first signal branched by the signal distribution circuit.

A leakage signal removing device for a circulator according to a fourth aspect includes a second circulator having the same configuration as the circulator, and the second circulator is provided with the signal distribution circuit and the adjustment signal generating circuit. The branch signal, which is disposed between the two, is input from the first terminal of the second circulator and leaked from the third terminal, and the leak signal is adjusted by the adjustment signal generation circuit. An adjustment signal is generated.

According to a fifth aspect of the present invention, in the leakage signal removing device for a circulator, the adjusting signal generating circuit adjusts the amplitude of the branched signal of the first signal branched by the signal distributing circuit, The variable attenuator and the variable shifter are provided with a variable phase shifter that adjusts the phase of the branched signal of the first signal branched by the signal distribution circuit, and a temperature compensation circuit that compensates the characteristic variation due to the temperature of the circulator. The temperature compensation circuit is arranged in at least one of the phase shifters.

According to a sixth aspect of the leakage signal removing device of the circulator, the signal distributing circuit and / or the signal synthesizing circuit is a hybrid circuit.

Further, in the leakage signal elimination device for a circulator according to a seventh aspect, the signal distribution circuit and / or the signal combination circuit is a directional coupler.

A leakage signal removing device for a circulator according to an eighth aspect is provided with a constant temperature bath for keeping the circulator at a constant temperature, and the circulator is arranged in the constant temperature bath.

A radio communication device using the leakage signal removing device for a circulator according to claim 8 includes: a leakage signal removing device for a circulator; and a transmitter for outputting a first signal to a first terminal of the circulator. An antenna connected to the second terminal of the circulator, and a receiver for inputting the second signal and the leakage signal output from the third terminal of the circulator via the leakage signal removing device of the circulator. Be prepared.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A leak signal removing method for a circulator, a leak signal removing apparatus for a circulator, and a wireless communication device using the same according to the present invention will be described below with reference to [Embodiment 1], [Embodiment 2], and [Embodiment 1]. 3] and [Embodiment 4] will be described in detail with reference to the drawings.

[Embodiment 1] FIG. 1 is a schematic configuration diagram of a leakage signal removing method for a circulator, a leakage signal removing apparatus for a circulator, and a wireless communication device using the same according to a first embodiment of the present invention. Indicates. In the wireless communication device of the first embodiment, a circulator 104 is inserted between a transmitter 102 and a receiver 103 in order to use the antenna 101 in common as shown in the figure, and further the circulator 104 is used.
The leaky signal removing device 105 for removing the leaky signal S (f ₁ ) of FIG.

Here, the circulator 104 inputs the signal (transmitted wave T (f ₁ )) from the transmitter 102 to the input terminal 1 (first terminal) and the signal input from the input terminal 1 to the antenna 101. Three terminals, an input / output terminal 2 (second terminal) for outputting a signal from the antenna 101 and an output terminal 3 (third terminal) for outputting a signal input from the input / output terminal 2 to the receiver 103 side, are provided. It has a terminal.

The leakage signal removing device 105 is arranged between the transmitter 102 and the input terminal 1 of the circulator 104, and the transmission wave T (f ₁ ) output from the transmitter 102 is provided.
Some branches of, type branch signal B (f ₁₎ hybrid circuit 106 for signal distribution for outputting, branch signal B from the hybrid circuit 106 (f _1), the branch signal B
Adjust the phase of (f ₁ ) and the phase, and adjust signal C
The adjustment signal generation circuit 107 for generating (f ₁ ) and the adjustment signal C (f ₁ ) are input from the adjustment signal generation circuit 107, and the adjustment signal C (f ₁ ) is part of the transmission wave T (f ₁ ). Is leaked and combined with the leaked signal S (f ₁ ) output from the output terminal 3 of the circulator 104, and is composed of a hybrid circuit 108 for signal combination for canceling and suppressing.

The adjustment signal generating circuit 107 includes a variable attenuator 107a for adjusting the amplitude of the branch signal B (f ₁ ) branched by the hybrid circuit 106, and a variable attenuator 107a.
Input the branch signal B (f ₁ ) after adjusting the amplitude from
Variable phase shifter 10 for adjusting the phase of the branch signal B (f ₁ ).
7b. However, the arrangement of the variable attenuator 107a and the variable phase shifter 107b is not particularly limited, and the branch signal B (f
After adjusting the phase of ₁ ) via the variable phase shifter 107b,
The amplitude may be adjusted by the variable attenuator 107a.

The operation of the above configuration will be described. When the transmitter 102 and the receiver 103 operate simultaneously, the transmission wave T (f ₁ ) output from the transmitter 102 is
Circulator 104 via hybrid circuit 106
Is input to the antenna 101 via the input / output terminal 2 from the input terminal 1 of the circulator 104 and transmitted. At this time, part of the transmitted wave T (f ₁ ) spills from the input terminal 1 to the output terminal 3 of the circulator 104, leaks from the output terminal 3 to the receiver 103 side, and becomes a leak signal S (f ₁ ).

On the other hand, the received wave R (f ₂ ) received by the antenna 101 is output from the input / output terminal 2 of the circulator 104 to the receiver 103 side via the output terminal 3. Therefore, when transmission and reception are performed simultaneously, the received wave R (f ₂ ) is output from the output terminal 3 of the circulator 104.
And the leak signal S (f ₁ ) described above is output.

Therefore, in the first embodiment, by configuring the leakage signal removing device 105 as shown in FIG. 1, a part of the transmission wave T (f ₁ ) is branched by the hybrid circuit 106 in the branch signal B (f ₁ ). , The amplitude of the branched signal B (f ₁ ) is adjusted by the variable attenuator 107a, and the phase shift is adjusted by the variable phase shifter 107b, and then the adjusted signal C (f ₁ ) is sent to the hybrid circuit 108. The leak signal S (f ₁ ) (actually the received wave R (f ₂ ) + leak signal S (f ₁ )) that is output and input to the hybrid circuit 108 via the circulator 104 in the hybrid circuit 108 and the adjustment The signal C (f ₁ ) is combined.

Here, the adjustment signal C (f₁) And the leakage signal S
(F₁Both signal levels are the same and the phase is 180 degrees
If they are different, they will cancel each other out.
Signal D that has passed through the hybrid circuit 108
(F₂) Is almost the received wave R (f ₂) Only
Issue S (f₁) To the receiver 103 can be reduced.
Can be.

Therefore, the circulator 1 is previously prepared.
To measure the amplitude and phase of the leak signal S (f ₁ ) leaking 04, and cancel the measured amplitude and phase,
The variable attenuator 107a and the variable attenuator 107a are adjusted. According to the experiment, it was possible to obtain an attenuation amount of about 65 dB in the 900 MHz band wireless communication device by this method.

As described above, according to the first embodiment, the amplitude and phase of the branch signal B (f ₁ ) branched by the hybrid circuit 106 are adjusted by the adjustment signal generation circuit 107 (variable attenuator 1).
07a and adjusted by variable phase shifter 107 b) to generate an adjustment signal C (f _1), so offset to suppress the leakage signal S (f ₁₎ using said adjustment signal C (f ₁₎ at the hybrid circuit 108 , The leakage signal S (f ₁ ) of the circulator 104
Only those can be selectively removed. Therefore, even in a wireless communication device that shares the antenna 101 via the circulator 104, it is possible to use frequencies close to each other for transmission and reception.

[Embodiment 2] FIG. 2 is a schematic configuration diagram of a wireless communication device according to a second embodiment to which a leakage signal removing method for a circulator, a leakage signal removing device for a circulator, and a wireless communication device using the same according to the present invention are applied. In the wireless communication device of the second embodiment, instead of the leakage signal removing device 105 of the first embodiment,
The leakage signal removing device 105 is provided with a leakage signal removing device 201 in which a temperature compensation circulator 202 is arranged. The basic configuration and operation are the same as in the first embodiment.
Since it is the same as the above, only different parts will be described here.

The temperature compensating circulator 202 has the same structure as the circulator 104, is arranged between the hybrid circuit 106 and the adjustment signal generating circuit 107 as shown in the figure, and is branched by the hybrid circuit 106. ₁ ) is input from the input terminal 1 of the temperature compensation circulator 202 and leaked from the output terminal 3, and the leak signal E (f ₁ ) is adjusted by the adjustment signal generation circuit 107 to generate the adjustment signal C (f ₁ ). To do.

A resistor R as a pseudo load corresponding to the antenna 101 is connected to the input / output terminal 2 of the temperature compensating circulator 202, and a branch signal B (f is added to the temperature compensating circulator 202. Most of the electric power in ₁ ) is absorbed by the resistor R.

The role of the temperature compensating circulator 202 in the above configuration will be described. Generally, in the circulator, the level of the signal leaked from the input terminal 1 to the output terminal 3 changes significantly due to the change in ambient temperature. It is thought that this is because the circulator is set so that the maximum amount of attenuation is obtained at room temperature, but the best setting state collapses due to temperature changes. FIG.
Shows the relationship between the attenuation amount of the leakage signal S (f ₁ ) and the ambient temperature when the leakage signal removing apparatus 105 of the first embodiment shown in FIG. 1 is used, and the attenuation amount at room temperature is about 65 dB, It can be seen that the temperature significantly deteriorates to 25 dB at 20 and 30 degrees.

Therefore, in the second embodiment, the circulator 1
In order to correct the change in the attenuation amount due to the change in the ambient temperature of 04, a temperature compensation circulator 202 having the same configuration as the circulator 104 is arranged, and a branch signal branched in the hybrid circuit 106 is used by the temperature compensation circulator 202. The attenuation amount of B (f ₁ ) is calculated by the circulator 104.
It is adjusted to the attenuation amount of the leak signal S (f ₁ ) leaking from the.

If the circulator 104 and the temperature compensating circulator 202 have the same characteristics, the leakage ratio, the leakage temperature characteristic, and the aging characteristic are also the same. Therefore, the temperature compensating circulator 202 is used. By using the branch signal B (f ₁ ) as the leak signal E (f ₁ ), the leak signal S (f ₁ ) of the circulator 104 can be obtained.
Similarly to the above, the amount of attenuation can be changed and the change in ambient temperature can be absorbed.

FIG. 4 shows a leakage signal removing device 20 of the second embodiment.
3 shows the relationship between the attenuation amount of the leaky signal S (f ₁ ) and the ambient temperature when 1 is used, and the leaky signal removing apparatus 10 shown in FIG.
As compared with the case of No. 5 (example in which the circulator 202 for temperature compensation is not provided), the deterioration of the attenuation amount can be significantly improved.

As described above, according to the second embodiment, by disposing the temperature compensating circulator 202, in addition to the effects of the first embodiment, a more stable leakage signal removing device 2 is provided.
01 can be provided, and the communication of the wireless communication device can be stabilized.

[Third Embodiment] FIG. 5 is a schematic configuration diagram of a wireless communication device of a third embodiment to which a leakage signal removing method for a circulator, a leakage signal removing device for a circulator and a wireless communication device using the same according to the present invention are applied. In the wireless communication device of the third embodiment, the temperature compensating circuits 502c and 502c are added to the configuration of the first embodiment.
The leakage signal removing device 501 with the addition of 2d is used. Since the basic configuration and operation are the same as those in the first embodiment, only different parts will be described here.

The adjustment signal generation circuit 502 of the leakage signal elimination device 501 of the third embodiment is a variable voltage variable attenuator 502a.
And a variable phase shifter 502b, a variable attenuator 502a and a variable phase shifter 502b are connected in a cascade (not shown), and temperature compensation circuits 502c are connected to respective voltage application terminals.
502d is attached.

FIGS. 6A and 7A show circuit examples of the temperature compensating circuits 502c and 502d. FIG. 6A shows an example of the temperature compensating circuit in the positive direction, and FIG. 7A shows a negative example. An example of a directional temperature compensation circuit is shown. Since the leakage ratio of the circulator 104 and the temperature change of the phase of the leakage signal have a characteristic that they change at a room temperature of about ± 20 degrees, they can be corrected by a relatively simple electronic circuit.

In FIG. 6A or FIG. 7A, A
Is an operational amplifier, Rf and Ri are variable resistors, Rth is a negative characteristic thermistor, and Es and Es' are reference voltages.

As shown in FIG. 6B, in the case of the temperature compensating circuit in the positive direction, the slope of the output voltage E ₀₁ of the temperature compensating circuit can be set by the reference voltage Es and the variable resistor Rf. Further, as shown in FIG. 7B, in the case of the negative temperature compensation circuit, the offset of the output voltage E ₀₂ of the temperature compensation circuit can be set by the reference voltage Es ′ and the variable resistor Ri. By setting the variable resistors Rf and Ri, it is possible to compensate for any first-order characteristic (straight line).

FIG. 8 shows the temperature characteristics of the attenuation amount (amplitude) and the phase of the circulator 104. As shown in the figure, the attenuation amount shows the negative direction and the phase shows the positive characteristic with respect to the temperature change. Therefore, temperature compensation is easily performed by using the negative temperature compensation circuit of FIG. 7A as the temperature compensation circuit 502c and the positive temperature compensation circuit of FIG. 6A as the temperature compensation circuit 502d. be able to.

As a result, the device using only the circulator 104 can obtain the same characteristics as the device using the two circulators 104 and 202, as shown in the second embodiment.

As described above, according to the third embodiment, by disposing the temperature compensating circuits 502c and 502d, in addition to the effect of the first embodiment, a more stable leakage signal removing device 5 is provided.
01 can be provided, and the communication of the wireless communication device can be stabilized.

[Embodiment 4] FIG. 9 is a schematic configuration diagram of a leakage signal removing method for a circulator, a leakage signal removing apparatus for a circulator, and a wireless communication device using the same according to an embodiment 4 of the present invention. In the wireless communication device of the fourth embodiment, a constant temperature bath 901 for keeping the circulator 104 at a constant temperature is added to the configuration of the first embodiment.

In the fourth embodiment, since the temperature of the circulator 104 is kept constant (for example, 25 ° C.) by the constant temperature layer 901, it is possible to avoid the deterioration of the separation characteristic of the circulator 104 due to the temperature change. Therefore, the leakage signal removing device 105 can always remove the leakage signal S (f ₁ ) in the best state.

In the above-mentioned first to fourth embodiments,
Although the hybrid circuit 106 and the hybrid circuit 108 are used as the signal distribution circuit and the signal synthesis circuit of the present invention, the invention is not particularly limited to this, and the same effect can be obtained by using a directional coupler.

Generally, a hybrid circuit has an equal distribution
It is a synthesizer. On the other hand, the directional coupler can be used as an unequal amount of distributor / combiner. Since the signal distribution circuit according to the present invention does not necessarily need to be equally distributed, the present invention can be implemented using a directional coupler.

[0052]

As described above, the leakage signal removing method for a circulator according to the present invention (claim 1) comprises a step of branching a part of the first signal input to the first terminal of the circulator, The step of adjusting the amplitude and phase of the branched signal of the first signal to create the adjustment signal, and the adjustment signal and the leakage signal output from the third terminal due to leakage of a part of the first signal are combined. Since the adjustment signal has a step of canceling and suppressing the leakage signal, only the leakage signal of the circulator can be selectively removed.

A leakage signal removing device for a circulator of the present invention (claim 2) is a signal distribution circuit for branching a part of the first signal input to the first terminal, and a signal distribution circuit for branching by the signal distribution circuit. The adjustment signal generating circuit that adjusts the amplitude and phase of the branched signal of the signal No. 1 and generates the adjustment signal, and the adjustment signal adjusted by the adjustment signal generating circuit, part of the first signal leaks and the third signal Since the leaky signal output from the terminal is combined with the signal combining circuit, only the leaky signal of the circulator can be selectively removed.

Further, in the leakage signal removing device for a circulator of the present invention (claim 3), the adjustment signal generating circuit includes a variable attenuator for adjusting the amplitude of the branched signal of the first signal branched by the signal distribution circuit, Since it is composed of a variable phase shifter that adjusts the phase of the branch signal of the first signal branched by the signal distribution circuit, it is possible to selectively remove only the leakage signal of the circulator with a simple and low-cost configuration. it can.

A leakage signal removing device for a circulator according to the present invention (claim 4) includes a second circulator having the same structure as the circulator, and the second circulator is provided between the signal distribution circuit and the adjustment signal generating circuit. The branch signal branched from the signal distribution circuit is input from the first terminal of the second circulator to leak from the third terminal, and the leak signal is adjusted by the adjustment signal generation circuit to generate the adjustment signal. Therefore, it is possible to deal with the level change of the leak signal of the circulator due to the ambient temperature, and it is possible to selectively and selectively remove only the leak signal of the circulator stably.

Also, in the leakage signal removing device for a circulator of the present invention (claim 5), the adjustment signal generating circuit adjusts the amplitude of the branched signal of the first signal branched by the signal distribution circuit, A variable phase shifter that adjusts the phase of the branched signal of the first signal branched by the signal distribution circuit, and a temperature compensation circuit that compensates for characteristic fluctuations due to the temperature of the circulator are provided, and at least the variable attenuator and the variable phase shifter are provided. Since the temperature compensating circuit is arranged on one side, it is possible to cope with the level change of the leak signal of the circulator due to the ambient temperature, and it is possible to selectively remove only the leak signal of the circulator more stably.

Further, in the leakage signal removing apparatus for a circulator of the present invention (claim 6), since the signal distribution circuit and / or the signal synthesizing circuit is a hybrid circuit, the signal branching and / or signal Synthesis can be performed.

Further, in the leakage signal removing device for a circulator of the present invention (claim 7), since the signal distribution circuit and / or the signal combining circuit is a directional coupler, the signal branching or / and / or Signal synthesis can be performed.

Further, the leakage signal removing device for a circulator of the present invention (claim 8) is provided with a constant temperature bath for keeping the circulator at a constant temperature, and the circulator is arranged in the constant temperature bath, so that the level of the leakage signal of the circulator is constant. In addition, only the leakage signal of the circulator can be selectively removed more stably.

According to a second aspect of the present invention, there is provided a wireless communication device (claim 9) using the leakage signal removing device for a circulator according to the present invention.
A leakage signal removing device for a circulator according to any one of claims 1 to 6;
A transmitter that outputs a first signal to the first terminal of the circulator, an antenna that is connected to the second terminal of the circulator, and a second signal and a leakage signal that are output from the third terminal of the circulator. Since it is provided with a receiver for inputting through the leaked signal removing device, the close proximity frequency can be used for transmission and reception in a wireless communication device that shares an antenna through a circulator.

[Brief description of drawings]

FIG. 1 is a method for removing a leak signal of a circulator according to the present invention,
1 is a schematic configuration diagram of a wireless communication device of a first embodiment to which a leakage signal removing device for a circulator and a wireless communication device using the same are applied.

FIG. 2 is a method for removing a leakage signal of a circulator according to the present invention,
It is a schematic block diagram of the radio | wireless communication apparatus of Example 2 to which the leakage signal removal apparatus of a circulator and the radio | wireless communication apparatus using the same are applied.

FIG. 3 is an explanatory diagram showing a relationship between a leakage signal attenuation amount and an ambient temperature when the leakage signal removing device of the first embodiment shown in FIG. 1 is used.

FIG. 4 is an explanatory diagram showing a relationship between an attenuation amount of a leakage signal and an ambient temperature when the leakage signal removing device of the second embodiment is used.

FIG. 5 is a method for removing a leakage signal of a circulator according to the present invention,
It is a schematic block diagram of the radio | wireless communication apparatus of Example 3 which applied the leaking signal removal apparatus of a circulator and the radio | wireless communication apparatus using the same.

FIG. 6A shows a circuit configuration example in the case of a positive temperature compensation circuit, and FIG. 6B shows the relationship between the output voltage and the variable resistor of the temperature compensation circuit of FIG. It is an explanatory view shown.

7A shows a circuit configuration example in the case of a negative direction temperature compensation circuit, and FIG. 7B shows the relationship between the output voltage and the variable resistor of the temperature compensation circuit of FIG. It is an explanatory view shown.

FIG. 8 is an explanatory diagram showing temperature characteristics of attenuation (amplitude) and phase of a circulator.

FIG. 9 is a method of removing a leakage signal of a circulator according to the present invention,
It is a schematic block diagram of the radio | wireless communication apparatus of Example 4 which applied the leaking signal removal apparatus of a circulator and the radio | wireless communication apparatus using the same.

FIG. 10 is a schematic configuration diagram of a wireless communication device in which an antenna is shared by using a conventional circulator.

[Explanation of symbols]

101 Antenna 102 Transmitter 103 Receiver 104 Circulator 105 Leakage Signal Removal Device (Leakage Signal Removal Device of Circulator of the Present Invention) 106 Hybrid Circuit 107 Adjustment Signal Generation Circuit 107a Variable Attenuator 107b Variable Phase Shifter 108 Hybrid Circuit 201 Leakage Signal Removal Device 202 Temperature compensation circulator 501 Leakage signal removal device 502 Adjustment signal generation circuit 502a Variable attenuator 502b Variable phase shifter 502c, 502d Temperature compensation circuit 901 Temperature chamber

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeru Saito 4-72 Miyagaya Pagoda, Omiya City Antenna Giken Co., Ltd.

Claims (9)

[Claims] 1. A first terminal for inputting a first signal, and a second terminal for outputting a first signal input from the first terminal and inputting a second signal. And a third terminal circulator having a third terminal for outputting a second signal input from the second terminal, a part of the first signal input to the first terminal is branched. And a step of adjusting the amplitude and phase of the branch signal of the first signal to create an adjustment signal, and a part of the adjustment signal and the first signal leaks and is output from the third terminal. And the adjusted signal to cancel and suppress the leak signal. 2. A first terminal for inputting a first signal, and a second terminal for outputting a first signal input from the first terminal and inputting a second signal. And a third terminal circulator having a third terminal for outputting a second signal input from the second terminal, a part of the first signal input to the first terminal is branched. Signal distribution circuit for adjusting the amplitude and phase of the branched signal of the first signal branched by the signal distribution circuit to generate an adjustment signal, and an adjustment signal adjusted by the adjustment signal generation circuit And a signal synthesizing circuit for synthesizing a leak signal output from a third terminal by leaking a part of the first signal. 3. The adjustment signal generating circuit includes a variable attenuator that adjusts the amplitude of a branched signal of the first signal branched by the signal distribution circuit, and a first attenuator of the first signal branched by the signal distribution circuit. 3. The leakage signal removing device for a circulator according to claim 2, further comprising a variable phase shifter that adjusts the phase of the branch signal. 4. A second device having the same structure as that of the circulator.
Circulator, the second circulator is arranged between the signal distribution circuit and the adjustment signal generation circuit, and a branch signal branched by the signal distribution circuit is input from a first terminal of the second circulator. 4. The leakage signal removing device for a circulator according to claim 2, wherein the leakage signal is leaked from the third terminal, and the leakage signal is adjusted by the adjustment signal generating circuit to generate the adjustment signal. 5. The adjustment signal generating circuit includes a variable attenuator that adjusts the amplitude of a branched signal of the first signal branched by the signal distribution circuit, and a first attenuator of the first signal branched by the signal distribution circuit. A variable phase shifter for adjusting the phase of the branch signal and a temperature compensating circuit for compensating for the characteristic fluctuation due to the temperature of the circulator are provided, and the temperature compensating circuit is arranged in at least one of the variable attenuator and the variable phase shifter. The leakage signal removing device for a circulator according to claim 2, wherein 6. The leakage signal removing apparatus for a circulator according to claim 2, 3, 4 or 5, wherein the signal distribution circuit and / or the signal combining circuit is a hybrid circuit. 7. The leakage signal removing device for a circulator according to claim 2, 3, 4 or 5, wherein the signal distribution circuit and / or the signal combining circuit is a directional coupler. 8. The leakage signal removing device for a circulator according to claim 2, further comprising a thermostat for keeping the circulator at a constant temperature, and the circulator being arranged in the thermostat. 9. A leakage signal removing device for a circulator according to claim 2, and a first circulator.
A transmitter for outputting a first signal to a terminal of the circulator, an antenna connected to a second terminal of the circulator, and a second signal and a leakage signal output from a third terminal of the circulator for the circulator. A wireless communication device using a leakage signal removing device of a circulator, comprising: a receiver for inputting through the leakage signal removing device.