JPH0744371B2 - Shared antenna device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shared antenna device in the ultra-high frequency band, and more particularly to a shared device suitable for adding a shared transmitter / receiver circuit.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing a shared device which is conventionally used when a shared transmitter / receiver circuit is added. HYB ₄ to HYB ₇ are hybrid circuits, BPF ₁ and BPF ₂
Is a bandpass filter on the transmitting side, BPF ₃ and BPF ₄ are bandpass filters on the receiving side, T _A is a shared antenna connection terminal, T _T is an input terminal, T _R is an output terminal, and T _EX is an existing terminal. Input terminal of the combined voltage output from the shared transmission circuit, R ₆ and
Each R ₇ is a non-reflective terminator. Input terminal of the combined voltage output from the shared transmitter circuit in the existing shared transmitter / receiver circuit
When added to T _{E X,} is output to the common antenna connection terminal T _A via the hybrid circuit HYB ₄ and HYB _5. When the combined voltage output from the shared transmission circuit in the newly added shared transmission circuit is applied to the input terminal T _T , the hybrid circuit HYB ₆ ,
It is output to the shared antenna connection terminal T _A via the band pass filters BPF ₁ and BPF ₂ on the transmission side and the hybrid circuits HYB ₄ and HYB ₅ . Shared antenna reception combined voltage is shared antenna connection terminal
When added to T _A , it is output to the terminal T _R via the hybrid circuit HYB ₅ , the receiving side band pass filters BPF ₃ and BPF ₄ , and the hybrid circuit HYB ₇ .

[0003]

The above-mentioned conventional shared device has a relatively large number of constituent elements such as a hybrid circuit and the number of lines connecting the constituent elements, and thus is not easy to miniaturize and manufacture.

[0004]

In the first to third aspects of the present invention, outputs of two terminals have a phase difference of 90 ° with respect to each other and have electrical characteristics with substantially equal amplitudes. Hybrid circuit, a first coupler comprising first and second transmission circuits having different pass bands, and a third coupler having a pass band substantially equal to the pass band of the first transmission circuit in the first coupler. Second transmission circuit having a pass band substantially equal to the pass band of the second transmission circuit in the first coupler.
A coupler of the first hybrid circuit, and one of the two terminals of the first hybrid circuit is connected to the second hybrid circuit via the first transmission circuit of the first coupler. The first hybrid circuit is connected to one terminal of the two terminals, and one terminal of the two terminals of the first hybrid circuit is connected to a second transmission circuit of the first coupler. The second hybrid circuit is connected to one of the two terminals of the third hybrid circuit, and is connected to one of the two terminals of the first hybrid circuit.
The other terminal of the two terminals is connected to the other terminal of the two terminals of the second hybrid circuit via the third transmission circuit of the second coupler, and 2 in the first hybrid circuit
An antenna formed by connecting the other terminal of the two terminals to the other terminal of the two terminals of the third hybrid circuit via the fourth transmission circuit of the second coupler. It aims to eliminate the conventional drawbacks by realizing a shared device.

Second Solution: A hybrid circuit in which outputs of two terminals have a phase difference of 90 ° with each other and electric characteristics of which amplitudes are substantially equal to each other, and first and second transmission circuits having different pass bands. And a third coupler having a passband substantially equal to the passband of the first transmission circuit in the first coupler.
Second coupling circuit comprising a fourth transmission circuit having a pass band substantially equal to that of the second transmission circuit in the first coupling circuit and the second coupling circuit in the first coupling circuit, and first and second 90 ° phase shifts. A circuit and first and second branch circuits, wherein one of the two terminals of the hybrid circuit is connected to the first transmission circuit of the first coupler to obtain the first terminal. Connected to one branch line in the branch circuit, and one terminal of the two terminals in the hybrid circuit is connected to the second line in the first coupler.
Connected to one branch line in the second branch circuit via the transmission circuit, and the other terminal of the two terminals in the hybrid circuit is connected to the third transmission circuit in the second coupler. And the other branch line in the first branch circuit via the first 90 ° phase shift circuit, and the other terminal of the two terminals in the hybrid circuit is connected to the second branch line. The drawbacks of the prior art are eliminated by realizing an antenna shared device that is connected to the other branch line in the second branch circuit via the fourth transmission circuit in the coupler and the second 90 ° phase shift circuit. This is what you want to do.

[0006]

Operation of the first solving means Among the terminals of the first hybrid circuit, of the two terminals other than the two terminals having the phase difference of 90 ° with each other and outputting the outputs having substantially the same amplitude. If the combined voltage output from the shared transmitter circuit in the existing shared transmitter / receiver circuit is applied to either terminal of the
Delayed, the voltage obtained by multiplying the input combined voltage by the voltage reflection coefficient of the first and second couplers has a phase difference of 90 ° from each other at the terminals of the first hybrid circuit, and outputs with substantially the same amplitude Is output only to the other terminal (shared antenna connection terminal) of the two terminals other than the two terminals that output. 90 out of the terminals of the second hybrid circuit
Output from the shared transmission circuit in the newly added shared transmission / reception circuit to any one of the two terminals other than the two terminals that have the phase difference of ° and output with substantially the same amplitude. When the combined voltage is applied, the phase is delayed by 90 ° with respect to the input combined voltage, and the first and second
The voltage obtained by multiplying the voltage transmission coefficient of the transmission circuit in the coupler of is 90 ° from each other among the terminals of the first hybrid circuit.
The output is output only to any one of the two terminals other than the two terminals that have the phase difference of 1 and the outputs having substantially the same amplitude. Of the two terminals of the first hybrid circuit, which have a phase difference of 90 ° with each other and which output outputs having substantially the same amplitude, one of the two terminals has a common antenna. When the received combined voltage is applied, the phase is delayed by 90 ° with respect to the received combined voltage,
The voltage obtained by multiplying the received combined voltage by the voltage transmission coefficient of the transmission circuit in the first and second couplers has a phase difference of 90 ° from each other among the terminals of the third hybrid circuit,
It is output to only one of the two terminals other than the two terminals that output outputs having substantially the same amplitude.

Operation of the Second Solution Means Any one of the two terminals of the hybrid circuit other than the two terminals which have the phase difference of 90 ° from each other and output the outputs having substantially the same amplitude. When the combined voltage output from the shared transmission circuit in the existing shared transmission / reception circuit is applied to one terminal, the phase is delayed by 90 ° with respect to the input combined voltage, and the voltage reflection coefficient of the first and second couplers is added to the input combined voltage. The voltage multiplied by is output only to the other terminal out of the two terminals other than the two terminals that have outputs having substantially the same amplitude while having a phase difference of 90 °. First
Alternatively, when a combined voltage output from the shared transmission circuit in the newly added shared transmission / reception circuit is applied to the input terminal of the second branch circuit, the phase is delayed by 90 ° with respect to the input combined voltage, and The voltage obtained by multiplying the voltage transmission coefficient of the transmission circuit in the second coupler has a phase difference of 90 ° from each other among the terminals of the hybrid circuit, and the two terminals other than the two terminals that output outputs having substantially the same amplitude. It is output only to any one of the terminals. Among the terminals of the hybrid circuit, the combined reception voltage of the common antenna is applied to any one of the terminals other than the two terminals that have a phase difference of 90 ° and output the amplitudes that are almost equal to each other. Is added, the voltage corresponding to the reception combined voltage is output only to the output terminal of the second or first branch circuit.

[0008]

FIG. 1 is a block diagram showing an embodiment of the present invention, in which HYB ₁ is a first hybrid circuit, T ₁₁ , T ₁₂ and T.
₁₃ and T ₁₄ are terminals, HYB ₂ is a second hybrid circuit, T ₂₁ , T ₂₂ , T ₂₃ and T ₂₄ are terminals, and HY
B ₃ is the third hybrid circuit, T ₃₁ , T ₃₂ , T ₃₃ and T
₃₄ is a terminal, R ₂ and R ₃ are non-reflective terminators, DIP ₁ is a first coupler, and DIP ₂ is a second coupler.
The first to third hybrid circuits HYB ₁ to HYB ₃ are
Any of the conventionally known hybrid circuits is an appropriate hybrid circuit, that is, any hybrid circuit as long as the output amplitudes of the two terminals are substantially equal and the phase difference is 90 ° different from each other. Can be used to practice the present invention. Hereinafter, the scattering matrix [S _H ] is represented by the following equation, where C is the voltage coupling coefficient of the hybrid circuit used in the present invention and θ is the electrical angle of the coupling line portion.

[0009]

[Equation 1]

Next, the first coupler DIP ₁ in FIG.
A first transmission circuit having a pass band substantially equal to the combined output frequency band of the shared transmission circuit in the newly added shared transmission / reception circuit and the frequency band of the combined voltage received by the shared antenna, that is, shared in the shared transmission / reception circuit And a second transmission circuit having a pass band substantially equal to the demultiplexing input frequency band of the receiving circuit. T _D11 is the input terminal of the first transmission circuit, T _D14 is the output terminal of the first transmission circuit, and T _D13 is the second terminal.
, The input terminal of the transmission circuit of _T.sub.D12 is the output terminal of the second transmission circuit. The second combiner DIP ₂ comprises a third transmission circuit having a passband substantially equal to the passband of the first transmission circuit in the first combiner DIP _1, and a second transmission circuit in the first combiner DIP ₁ . And a fourth transmission circuit having a pass band substantially equal to the pass band of the transmission circuit. T _D21 is the input terminal of the third transmission circuit, T _D24 is the output terminal of the third transmission circuit, and T _D23 is the fourth terminal.
The input terminal of the transmission circuit of _T.sub.D22 is the output terminal of the fourth transmission circuit. The first to fourth transmission circuits forming the _first and _second couplers DIP ₁ and DIP ₂ are each formed of, for example, a bandpass filter. The present invention can also be implemented by using, for example, a diplexer configured so as to satisfy the conditions of the pass band as the first and second couplers DIP ₁ and DIP ₂ .

Hereinafter, the terminals of the first hybrid circuit HYB ₁
T ₁₁ is an input terminal, terminal T ₁₂ is an isolation terminal, terminal T ₁₃ is a direct terminal, terminal T ₁₄ is a coupling terminal, terminal T ₂₄ of the _second hybrid circuit HYB ₂ is an input terminal, terminal T ₂₃
Is an isolation terminal, terminal T ₂₂ is a direct terminal,
Terminal T ₂₁ is a coupling terminal, terminal T ₃₄ of the _third hybrid circuit HYB ₃ is an input terminal, terminal T ₃₃ is an isolation terminal,
The operation of the shared device of the present invention will be described assuming that the terminal T ₃₂ is a direct terminal and the terminal T ₃₁ is a coupling terminal. Transmission operation of the shared transmitter circuit output in the existing shared transmitter / receiver circuit When the combined voltage E _S output from the shared transmitter circuit (not shown) in the existing transmitter / receiver circuit is applied to the input terminal T ₁₁ of the first hybrid circuit HYB ₁ The output voltages E ₁₁ , E ₁₂ , E ₁₃ and E ₁₄ of the terminals T ₁₁ , T ₁₂ , T ₁₃ and T _{14 in} the above equation are expressed by the following equations.

[Equation 2]

That is, when the combined voltage E _S is applied to the input terminal T ₁₁ of the first hybrid circuit HYB ₁ , the voltage shown in equation (3) is applied to the direct terminal T ₁₃ and the equation (3) is applied to the coupling terminal T _14. The voltages shown in 4) are output.

[Equation 3] When the voltage reflection coefficient in the _first and _second couplers DIP ₁ and DIP ₂ is Γ (f), the reflected voltage obtained by multiplying the voltage shown in equation (3) by the voltage reflection coefficient Γ (f) is the direct terminal.
The reflected voltage, which is added to T ₁₃ and is obtained by multiplying the voltage shown in equation (4) by the voltage reflection coefficient Γ (f), is added to the coupling terminal T ₁₄ , so that each terminal T ₁₁ , T ₁₂ , T ₁₃ The voltages E _11G , E _12G , E _13G and E _14G generated at T and T ₁₄ are expressed by the following equations.

[0013]

[Equation 4]

As is apparent from the equation (5), when the combined voltage E _S is applied to the input terminal T ₁₁ of the first hybrid circuit HYB ₁ , the phase is delayed by 90 ° with respect to the input combined voltage E _S , and the input combination is performed. first and second coupler DIP ₁ and the voltage obtained by multiplying the voltage reflection coefficient of _{DIP 2 Γ (f) -jE S} Γ (f) is isolator voltage E _S - output to the Deployment terminal T _12, input terminal T _No reflected voltage is output to ₁₁ . Therefore, the isolation terminal T
If a shared antenna is connected to ₁₂ , the combined output of the shared transmission circuits in the existing shared transmission / reception circuit can be radiated via the shared antenna of the device of the present invention. Even when the composite voltage E _S is applied to the isolation terminal T ₁₂ of the first hybrid circuit HYB ₁ and the common antenna is connected to the input terminal T ₁₁ , the same operation as described above can be performed. it can.

Transmission operation of the output of the shared transmission circuit in the additional shared transmission / reception circuit The input terminal of the _second hybrid circuit HYB ₂
When the combined voltage E _T output from the shared transmission circuit (not shown) in the newly added shared transmission / reception circuit is added to T ₂₄ , the coupling terminal T ₂₁ , the direct terminal T ₂₂ , the isolation terminal
Deployment each voltage of the terminals T ₂₃ and the input terminal _{T 2 4 E T21, E T22} ,
E _T23 and E _T24 are represented by the following equations.

[Equation 5]

Let the voltage transfer coefficients of the first and third transmission circuits in the first and _second couplers DIP ₁ and DIP ₂ be L _T , respectively.
If (f), the input terminal of the _second hybrid circuit HYB ₂
When the combined voltage E _T is applied to T ₂₄ , the voltage applied to the direct terminal T ₁₃ of the first hybrid circuit HYB ₁ is the formula (7), and the coupling terminal T _{1 4 of} the first hybrid circuit HYB ₁ is
The voltage applied to each of these is given by equation (8).

[Equation 6] Voltage is applied as shown in equation (7) to the first direct terminal T ₁₃ of the hybrid circuit HYB _1, when the voltage shown in equation (8) to the first coupling terminal T ₁₄ of the hybrid circuit HYB ₁ is applied , Each terminal T ₁₁ , T of the first hybrid circuit HYB _1
12, T ₁₃ and T _{1 4} voltage E _T11, E _T12, E _T13 and E
_T14 is expressed by the following equation.

[0017]

[Equation 7]

As is clear from the equation (9), when the combined voltage E _T is applied to the input terminal T ₂₄ of the second hybrid circuit HYB ₂ , the phase is delayed by 90 ° with respect to the input combined voltage E _T , and the input combination is performed. first and second coupler DIP ₁ and the voltage transmission coefficient of DIP ₂ L _T voltage multiplied by _{(f) -jE T L T (} f) is isolator voltage E _T - shared antenna via the Deployment terminal T ₁₂ , And is not output to other terminals.

Reception operation Isolation terminal T of the first hybrid circuit HYB _{1
When the} combined reception voltage E _R of the common antenna is applied to 12, the first
Each terminal T ₁₁ , T ₁₂ , T ₁₃ of the hybrid circuit HYB ₁ of
The voltages E _R11 , E _R12 , E _R13, and E _R14 appearing at T ₁₄ are represented by the following equation.

[Equation 8] If the voltage transfer coefficients of the second and fourth transmission circuits in the _first and _second couplers DIP ₁ and DIP ₂ are L _R (f), respectively, the direct terminal T _{32 of the third} hybrid circuit HYB ₃
The voltage represented by the equation (11) is output to and the voltage represented by the equation (12) is output to the coupling terminal T ₃₁ .

[Equation 9]

[0020] The third equation (11) to direct the terminal T ₃₂ and the coupling terminal T ₃₁ of the hybrid circuit HYB ₃ and voltage shown in equation (12) is applied, the third hybrid circuit HYB ₃
The voltage at each terminal T ₃₁ , T ₃₂ , T ₃₃ and T ₃₄ of E _R31 , E _R32 ,
E _R33 and E _R34 are represented by the following formula.

[Equation 10]

[0021] Formula (13) As is apparent from the first hybrid circuit HYB ₁ isolator - the received composite voltage E _R of the shared antenna to the Deployment terminal T ₁₂ is applied, it receives the composite voltage E _R
The phase is delayed by 90 ° with respect to, and the voltage -jE _R L _R (f) obtained by multiplying the received combined voltage E _R by the voltage transfer coefficient L _R (f) of the _first and _second couplers DIP ₁ and DIP ₂ is obtained. Terminal T of the third hybrid circuit HYB _3
It is output to ₃₄ and is not output to other terminals. The non-reflective terminator R ₂ is connected to the terminal T ₂₄ of the second hybrid circuit HYB ₂ in FIG. 1 and the terminal T ₂₃ is used as the input terminal.
Can also cause Itonama the operation similar to the above non-reflection terminator terminal T ₃₃ by connecting R ₃ to the terminal T ₃₄ of the hybrid circuit HYB ₃ as an input terminal of the. In addition, each pass band of the first transmission circuit in the first coupler and the third transmission circuit in the second coupler is a frequency band of the combined voltage received by the shared antenna, that is, shared reception in the shared transceiver circuit. A second transmission circuit of the first coupler and a fourth coupler of the second coupler, which are substantially matched with the demultiplexing input frequency band of the circuit.
By making each pass band of the transmission circuit of the third hybrid circuit HYB ₃ almost equal to the combined output frequency band of the shared transmission circuit of the newly added shared transmission circuit
The output voltage of the shared transmission circuit in the newly added shared transmission circuit to ₃₄ is added and radiated from the shared antenna,
The second hybrid circuit converts the received combined voltage of the common antenna
It can be output to terminal T _{24 of} HYB ₂ .

FIG. 2 is a block diagram showing another embodiment of the present invention, in which HYB ₁ is a hybrid circuit, DIP ₁ and DIP ₂ are first and second couplers, which are the first and the second in FIG. Hybrid circuit HYB ₁ , first and second couplers DIP ₁ and DI
The configuration is exactly the same as P ₂ . BC ₁ is a first branch circuit for distribution / combination, T _B13 is an input terminal, T _B11 and T _B12 are output terminals, BC ₂ is a second branch circuit for distribution / combination, T _B23 is an output terminal, T _B21 , And T _{B 22} are input terminals, and these branch circuits are made of suitable branch circuits, for example, first to third branch lines, among the conventionally known ones, and the input terminals in the first branch circuit BC ₁ Between T _B13 and the branch point,
The second branch circuit BC ₂ is composed of a branch circuit in which an impedance matching element made of, for example, a coaxial line is interposed between the output terminal T _B23 and the branch point. PS ₁ is a first phase shift circuit that delays the phase of the transmission voltage by 90 °, PS ₂ is a second phase shift circuit that is similar to the first phase shift circuit, and uses a conventionally known appropriate phase shift circuit. The invention may be implemented.

Hereinafter, the terminal T ₁₁ of the hybrid circuit HYB ₁ is the input terminal, the terminal T ₁₂ is the isolation terminal, and the terminal T ₁₃
Will be described as a direct terminal and the terminal T ₁₄ as a coupling terminal, and the operation of the shared device in this embodiment will be described. Transmission operation of the shared transmission circuit output in the existing shared transmission / reception circuit Input terminal T ₁₁ (or isolation terminal T of hybrid circuit HYB ₁ )
By adding the combined voltage output from the common transmission circuit (not shown) in the existing transmission / reception circuit to ₁₂ ),
In the same manner as in the previous embodiment, the isolation terminal T ₁₂
It is possible to radiate the combined output of the shared transmission circuit in the existing shared transmission / reception circuit via the shared antenna connected to (or the input terminal T ₁₁ ).

Transmission operation of shared transmitter circuit output in the additional shared transmitter / receiver circuit A composite voltage output from the shared transmitter circuit (not shown) in the newly added shared transmitter / receiver circuit at the input terminal T _B13 of the first branch circuit BC ₁ If you add E _T ,
The voltage applied to the direct terminal T ₁₃ of the hybrid circuit HYB ₁ via the output terminal TB ₁₂ of the branch circuit BC ₁ of the first, the first phase shift circuit PS ₁ and the third transmission circuit of the _second coupler DIP ₂ is , The output terminal of the _first branch circuit BC _{1 represented by} the equation (14)
The voltage applied to the coupling terminal T ₁₄ of the hybrid circuit HY B ₁ via T _B11 and the first transmission circuit of the first coupler DIP ₁ is given by equation (15).

[Equation 11] Formula (14) for the direct terminal T ₁₃ of the hybrid circuit HYB ₁
When the voltage shown in Equation (15) is applied to the coupling terminal T ₁₄ by applying the voltage shown in Equation (15), the voltages E _T11 , E of the terminals T ₁₁ , T ₁₂ , T ₁₃ and T ₁₄ of the hybrid circuit HYB ₁ are applied. _T12 , E _T13 and E _T14 are represented by the following equation.

[0025]

[Equation 12]

As is clear from the equation (16), when the combined voltage E _T is applied to the input terminal T _B13 of the first branch circuit, the phase is delayed by 90 ° with respect to the input combined voltage E _T , and the input combined voltage E _T First to _T
And the voltage -jE _S Γ (f) multiplied by the voltage transfer coefficient L _T (f) of the _second couplers DIP ₁ and DIP ₂ is applied to the common antenna via the isolation terminal T ₁₂ , and the other terminals are connected. Will not be output to.

The reception operation the hybrid circuit HYB ₁ isolator - if Deployment received composite voltage E _R of the shared antenna to the terminal T ₁₂ is applied, appears to the hybrid circuit the terminals T ₁₁ of HYB _1, T _12, T ₁₃ and T ₁₄ The voltages E _R11 , E _R12 , E _R13 and E _R14 are represented by the following equations.

[Equation 13]

Direct terminal T of hybrid circuit HYB ₁
Voltage of ₁₃ is transmitted to the second coupler fourth transmission circuit and the second input terminal T _{B 22} of the second branch via a phase shift circuit PS ₂ circuit BC ₂ DIP _2, the hybrid circuit HYB ₁ coupling terminal T
The voltage of ₁₄ is transmitted to the input terminal T _B21 of the second branch circuit BC ₂ via the second transmission circuit of the _first coupler DIP ₁ , so that the input terminal T _B of the second branch circuit BC ₂ is transmitted. _The voltage applied to _B22 is expressed by equation (18), and is the input terminal of the _second branch circuit BC2.
The voltage applied to T _B21 is given by equation (19).

[Equation 14] Since the voltages represented by the formulas (18) and (19) are in phase with each other, the combined voltage output to the output terminal T _B23 of the second branch circuit BC ₂ corresponds to the reception voltage E _R. .

Also in this embodiment, the passbands of the first transmission circuit of the first coupler and the third transmission circuit of the second coupler are defined as the frequency band of the combined voltage received by the shared antenna, that is, , Substantially matching the demultiplexing input frequency band of the shared reception circuit in the shared transmission / reception circuit, and newly adding the respective pass bands of the second transmission circuit in the first coupler and the fourth transmission circuit in the second coupler. By making the combined output frequency band of the shared transmission circuit of the shared transmission / reception circuit to be added approximately match, the output composite voltage of the shared transmission circuit of the newly added shared transmission / reception circuit at the terminal T _B23 of the _second branch circuit BC ₂ In addition, the common antenna is radiated and the combined reception voltage of the common antenna is applied to the terminal T _{B13 of the first} branch circuit BC _1.
Can be output to.

FIG. 3 is a curve diagram showing an example of the terminal-to-terminal transmission characteristics in the embodiment shown in FIG. 1, with the horizontal axis representing the transmission frequency f.
(MHz), vertical axis is attenuation ATT (dB), curve 1 is transmission between the input terminal T ₂₄ of the second hybrid circuit HYB ₂ and the isolation terminal T _{12 of} the first hybrid circuit HYB ₁ in FIG. The characteristic is shown by the curve 2, and the isolation terminal T ₁₂ of the first hybrid circuit HYB ₁ and the third hybrid circuit HYB ₁ .
It is a transmission characteristic between the input terminals T _{34 of} B ₃ . Figure 4 is a first hybrid circuit HYB ₁ input terminal T ₁₁ or isolator in FIG. 1 - the curve diagram showing an example of a reflection characteristic as viewed from the Deployment terminal T _12, the horizontal axis represents the transmission frequency f (MHz), vertical Axis is attenuation
ATT (dB), the third part of the curve is the first and second coupler DI
The reflection characteristics of the first and third transmission circuits in P ₁ and DIP _2, the portion 4 of the curve is the reflection transmission characteristic, and the portion 5 of the curve is the portion of the first and second couplers DIP ₁ and DIP ₂ . 2 is a reflection characteristic of the second and fourth transmission circuits. The transmission characteristics between the input terminal T _B13 of the first branch circuit BC ₁ and the isolation terminal T ₁₂ of the hybrid circuit HYB _{1 and} the isolation terminal T ₁₂ of the hybrid circuit HYB ₁ and the _first terminal in the embodiment shown in FIG. The transmission characteristic between the output terminals T _{B23 of the second} branch circuit BC ₂ is almost the same as in FIG. FIG. 5 is a curve diagram showing an example of the reflection characteristic in the embodiment shown in FIG. 2, the horizontal axis and the vertical axis are the same as those in FIG. 4, and the curve 6 is from the input terminal T _{B13 of the first} branch circuit BC _1. Reflection characteristics by the first and third transmission circuits in the first and _second couplers DIP ₁ and DIP ₂ seen, curve 7
The saw of the second branch circuit BC ₂ terminal T _B23 1 and the second
₂ is a reflection characteristic of the couplers DIP ₁ and DIP _{2 by} the second and fourth transmission circuits.

[0031]

As compared with the conventional device shown in FIG. 6, the shared device of the present invention has a smaller number of constituent elements such as a hybrid circuit and the number of connecting lines between the constituent elements, and thus the structure can be simplified and downsized accordingly. It can be manufactured, is relatively easy to manufacture, and has good electrical characteristics.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing another embodiment of the present invention.

FIG. 3 is a curve diagram showing an example of transmission characteristics of the device of the present invention.

FIG. 4 is a curve diagram showing an example of reflection characteristics of the device of the present invention.

FIG. 5 is a curve diagram showing an example of reflection characteristics of the device of the present invention.

FIG. 6 is a block diagram showing a conventional device.

[Explanation of symbols]

HYB ₁ hybrid circuit HYB ₂ hybrid circuit HYB ₃ hybrid circuit HYB ₄ hybrid circuit HYB ₅ hybrid circuit HYB ₆ hybrid circuit HYB ₇ hybrid circuit DIP ₁ coupler DIP ₂ coupler R ₂ non-reflective terminator R ₃ non-reflective terminator R ₆ Non-reflective terminator R ₇ Non-reflective terminator BC ₁ Branch circuit BC ₂ Branch circuit PS ₁ Phase shift circuit PS ₂ Phase shift circuit BPF ₁ Band pass filter BPF ₂ Band pass filter BPF ₃ Band pass filter BPF ₄ band pass filter

Claims (4)

[Claims] 1. A first to a third hybrid circuit in which outputs of two terminals have a phase difference of 90.degree. With each other and have electric characteristics having substantially equal amplitudes, and first and third hybrid circuits having different pass bands. First consisting of two transmission circuits
A third transmission circuit having a pass band substantially equal to the pass band of the first transmission circuit in the first coupler and the pass band of the second transmission circuit in the first coupler. A second coupler formed of a fourth transmission circuit having an equal pass band, wherein one of the two terminals of the first hybrid circuit is connected to the first coupler of the first coupler. Is connected to one terminal of the two terminals in the second hybrid circuit via the transmission circuit, and one terminal of the two terminals in the first hybrid circuit is connected to the one terminal of the two terminals. The first hybrid circuit is connected to one terminal of the two terminals of the third hybrid circuit via the second transmission circuit of the first coupler, and the two of the two terminals of the first hybrid circuit are connected. The other terminal of the child is connected to the other terminal of the two terminals of the second hybrid circuit via the third transmission circuit of the second coupler, and the first terminal of the second hybrid circuit is connected. The other terminal of the two terminals in the hybrid circuit is connected to the other terminal of the two terminals in the third hybrid circuit via the fourth transmission circuit in the second coupler. A shared antenna device characterized by being connected to a. 2. The passbands of the first transmission circuit in the first coupler and the third transmission circuit in the second coupler are:
The second transmission circuit and the second transmission circuit in the first coupler are substantially equal to the combined output (or demultiplexed input) frequency band of the shared circuit.
2. The antenna duplexer according to claim 1, wherein each pass band of the fourth transmission circuit in the coupler is substantially equal to the demultiplexing input (or multiplexing output) frequency band of the shared circuit. 3. A hybrid circuit having outputs of two terminals having a phase difference of 90 ° with each other and having electrical characteristics having substantially equal amplitudes, and a first and a second transmission circuit having different pass bands. 1
A third transmission circuit having a pass band substantially equal to the pass band of the first transmission circuit in the first coupler and the pass band of the second transmission circuit in the first coupler. A second coupler formed of a fourth transmission circuit having an equal pass band, a first and a second 90 ° phase shift circuit, and a first and a second branch circuit, One terminal of the plurality of terminals is connected to one branch line in the first branch circuit via the first transmission circuit in the first coupler, and the two terminals in the hybrid circuit are connected. One terminal of the terminals is connected to one branch line of the second branch circuit via the second transmission circuit of the first coupler, and one of the two terminals of the hybrid circuit is connected. The other of Is connected to the other branch line in the first branch circuit via the third transmission circuit in the second coupler and the first 90 ° phase shift circuit, and in the hybrid circuit, The other terminal of the two terminals is connected to the other branch line in the second branch circuit via the fourth transmission circuit in the second coupler and the second 90 ° phase shift circuit. A shared antenna device characterized by comprising the following. 4. The passbands of the first transmission circuit of the first coupler and the third transmission circuit of the second coupler are:
The second transmission circuit and the second transmission circuit in the first coupler are substantially equal to the combined output (or demultiplexed input) frequency band of the shared circuit.
4. The antenna common use apparatus according to claim 3, wherein each pass band of the fourth transmission circuit in the coupler is substantially equal to the demultiplexing input (or multiplexing output) frequency band of the shared circuit.