JP2000209007A - Signal composing circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a signal composing circuit wide in band by connecting an extension line, which has the length of a prescribed wavelength in intra-medium wavelength conversion at the time of a frequency to be a center within an operating frequency band, to the input/output terminal of a main line, further, parallel connecting an inductor and a capacitor and adding an LC parallel circuit grounding one terminal. SOLUTION: Extension lines 8a, 8b, 8c and 8d are connected between main lines 2a and 2b and input/output lines 5a, 5b, 5c and 5d of a directional coupler 1. The extension lines 8a-8d have the same impedance value as two main lines and the length thereof is 1/4 wavelength in the intra-medium wavelength conversion at the time of the frequency to be the center within the operating frequency band. An inductor 9 is formed from a microstrip line on a dielectric substrate 7. An LC parallel circuit 12 is constituted by connecting the inductor 9 and a capacitor 10. The LC parallel circuit is added from a gap between the extension lines 8a-8d and the input/output lines 5a-5d to a ground terminal 11. The number of components is reduced by a signal synthesizing circuit and the circuit is miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadband signal synthesizing circuit having a directional coupler used as a component of a high-frequency power supply circuit.

[0002]

2. Description of the Related Art FIG. 13 is a diagram showing the configuration of a conventional signal synthesis circuit, which is an example in which a directional coupler and an input / output line formed on a dielectric substrate are constituent elements. In FIG. 13, reference numeral 1 denotes a directional coupler, 2a and 2b each have a predetermined characteristic impedance value, and the length of a quarter wavelength in terms of the wavelength in the medium at the center frequency in the operating frequency band. And two main lines 3a, 3 arranged in parallel
b, 3c and 3d are four input / output terminals of the two main lines 2a and 2b, and 4a and 4b are orthogonal to the two main lines 2a and 2b between the input / output terminals 3a and 3c and between 3b and 3d. And
Further, two couplings having characteristic impedance values different from those of the two main lines 2a and 2b and having a length of a quarter wavelength in terms of the wavelength in the medium at the center frequency in the operating frequency band. It is a track. 5a, 5b, 5c, 5d are input / output terminals 3a, 3b, 3c,
3d, an input / output line having a predetermined characteristic impedance value, 6a, 6b, 6c, 6d are four input / output terminals of a signal combining circuit composed of the above components, and 7 is the above components 1, 5a, 5b, 6a and 6c are dielectric substrates formed thereon. Further, as an example of widening the bandwidth of the directional coupler, “Patent Application Publication No. 52-10344”
No.).

Next, the operation will be described. For convenience of explanation, the frequency is limited to the center frequency in the operating frequency band. The operation of the signal synthesizing circuit configured as described above depends on the operation of the directional coupler as a component. The operation concept of the directional coupler will be described with reference to FIG. The path until the high-frequency signal input to the first input / output terminal 6a reaches the second input / output terminal 6b can be considered as divided into path A and path B as shown. Further, a path until the high-frequency signal input to the first input / output terminal 6a reaches the third input / output terminal 6c can be considered as divided into a path C and a path D as shown. The lengths of the main line 2 and the coupling line 4 are 4 when converted to the wavelength in the medium at the center frequency in the operating frequency band.
Since the wavelength is a quarter wavelength, the distance between the terminals 3a, 3b, 3c, and 3d, which are the connection branch points of the main line 2, the coupling line 4, and the input / output line 5, is a quarter wavelength. There is no path length difference between the path C and the path D, and signals reaching the terminal 6c via both paths are combined with the same phase. On the other hand, a half-wavelength path length difference occurs between the path A and the path B, and signals reaching the terminal 6 via both paths are combined in opposite phases. Therefore, if the characteristic impedance ratio of the main lines 2a and 2b and the coupling lines 4a and 4b is set to an appropriate value, the amplitude of the signal reaching the input / output terminal 6b from the input / output terminal 6a via the path A and the input / output via the path B The amplitude of the signal reaching the terminal 6b, the amplitude of the signal reaching the input / output terminal 6c via the path C from the input / output terminal 6a, and the amplitude of the signal reaching the input / output terminal 6c via the path D can be equalized. . Therefore, when a signal is input from the input / output terminal 6a,
A signal is output to c, but no signal is output to the input / output terminal 6b. On the other hand, the signal output from the input / output terminal 6a to the input / output terminal 6d is the input / output terminal 6c of the input signals.
, And may be conceptually considered to be transmitted via the path E. Since there is a path length difference of a quarter wavelength between the paths C, D and E, the input / output terminals 6
a that is input from a and output to the input / output terminal 6c;
There is a 90 ° phase difference between the signal output to the input / output terminal 6d.

The above is an outline of the principle of operation of the signal synthesis circuit at the center frequency in the operating frequency band. The circuit response for the frequency characteristics including frequencies other than the center frequency in the operating frequency band is represented by the transmission line. It can be explained by expressing by parameters. If the signal combining circuit shown in FIG. 14 is considered as a four-port network, the expression as shown in FIG. 15 can be obtained. The scattering matrix [S] of this signal synthesis circuit is obtained as follows. In FIG. 14, two main lines 2
If the characteristic impedance values of a and 2b and the coupling lines 4a and 4b are Z ₂ and Z ₁ , the lengths are l ₂ and l ₁ and their propagation constants are γ ₂ and γ ₁ , the equivalent circuit of the directional coupler 1 is FIG.
Can be represented by As shown, this circuit is symmetrical with respect to the plane AA, so that the scattering matrix [S _e ] for even-mode excitation corresponding to this plane being open and this plane being short-circuited. The scattering matrix [S _o ] can be obtained using the scattering matrix [S _o ] for the odd mode excitation. FIG. 17 shows an equivalent circuit when the directional coupler is excited in the even mode, and this circuit can be considered by being divided into three circuit elements as shown in FIG. FIG.
The F matrix circuit elements I in the 8 [F _eI], circuitry II
If the F matrix of the directional coupler 1 is [F _II ], the F matrix [F _e ] of the directional coupler 1 becomes
Is represented by

[0005]

(Equation 1)

The F matrix [F _eI ] of the circuit element I is expressed by _equation (2), and the F matrix [F _II ] of the circuit element II is expressed by equation (3). The F matrix [F _e ] of the directional coupler 1 is expressed by Expression 4.

[0007]

(Equation 2)

[0008]

(Equation 3)

[0009]

(Equation 4)

FIG. 19 shows an equivalent circuit when the directional coupler 1 is excited in the odd mode, and FIG. 20 is a diagram in which this circuit is disassembled into three circuit elements. As in the case of the even mode excitation, the F matrix [F _o ] is obtained by calculating the F matrix [F _oI ] of the circuit element I expressed by _Formula 5 and the F matrix [F _II ] of the circuit element II similar to the case of the even mode excitation. Since the cascade connection is represented by Equation 6, the F matrix [F _o ] of the directional coupler 1 at the time of the odd mode excitation is represented by Equation 7 using Equations 6, 3, and 5.

[0011]

(Equation 5)

[0012]

(Equation 6)

[0013]

(Equation 7)

Next, the input / output lines 5a, 5d of the signal synthesis circuit
Is the characteristic impedance value of Z ₀₁ , and the input / output lines 5b, 5c
Is assumed to be Z ₀₂ , the scattering matrices [S _e ] and [S _o ] corresponding to the case where the directional coupler 1 is excited in the respective excitation modes are the F matrix [F
_e ], [F _o ], and are represented by Expression 8, Expression 9, Expression 10, and Expression 11.

[0015]

(Equation 8)

[0016]

(Equation 9)

[0017]

(Equation 10)

[0018]

[Equation 11]

The response S ₁₁ of the circuit in the case of inputting the signal only to the port 1 in FIG. _{15, S 21, S 31,} S 41 is S _11e from the symmetry of the circuit, S _21e, S _11o, using only S _21o Can be expressed by Equation 12.

[0020]

(Equation 12)

[0021] The number 12 is a reflected output to the first output terminal 6a in the case of inputting the signal from the first output terminal 6a of the signal combining circuit represented in Figure 14 S _11, the third input and output S ₃₁ and S ₄₁ are coupled output to the terminal 6c and fourth input terminals 6d, S ₂₁ are obtained a decoupling output to the second input terminal 6b. Here, as an example, when a signal having a relative amplitude of 1 is input from the input / output terminal 6a to a signal combining circuit having transmission line parameters as shown in FIG. 21, the relative amplitude of the output signal to each input / output terminal is calculated. . The calculated frequency is the center frequency in the operating frequency band. The lengths of the main lines 2a and 2b and the lengths of the coupling lines 4a and 4b of the directional coupler 1 are the center frequencies in the operating frequency band. At a wavelength conversion in the medium
The wavelength is set so that the characteristic impedance values of the input / output lines 5a and 5c and the characteristic impedance values of the input / output lines 5b and 5d and the characteristic impedance values of the main lines 2a and 2b of the directional coupler 1 are set to be equal. ing. FIG. 22 shows the calculation results. The evaluation items of the wide bandwidth of the signal combining circuit | S ₃₁ | and | S ₄₁ | ratio at which the distribution ratio of amplitudes frequency bandwidth BW1 a predetermined range, the reflected output amplitudes | S ₁₁ | a predetermined value The following frequency bandwidth BW2,
There is a frequency bandwidth BW3 in which the amplitude | S ₂₁ | of the decoupling output is equal to or smaller than a predetermined value. For example, the required value for the distribution amplitude ratio is 0.3 dB or less, and the required value for the reflection output is -20d.
B and below, if the requirement for decoupling output is -20 dB or less, BW1 is about 12% in fractional bandwidth from FIG.
It can be seen that BW2 and BW3 are about 11% in the fractional band.

[0022]

The conventional signal synthesizing circuit has the above configuration and operation. In order for a signal synthesizing circuit to be practical as a component of a high-frequency power supply circuit used for radar, communication equipment, and the like, it is desired that the operating frequency band be wide. From this viewpoint, the above-described conventional signal synthesis circuit has a problem that the operating frequency band is narrow.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to widen the bandwidth of a signal combining circuit including a directional coupler as a component.

[0024]

The signal synthesizing circuit according to the first invention has a characteristic impedance value similar to that of the main line, and when the frequency is the center frequency in the operating frequency band, it is 4 minutes in terms of the wavelength in the medium. Are connected to the input / output terminals of the two main lines.
A directional coupler, in which an inductor and a capacitor are connected in parallel to input / output terminals of the extension line and an LC parallel circuit having one end grounded, is added as a component.

Further, the signal synthesizing circuit according to the second invention has
Two extension lines having a characteristic impedance value similar to that of the main line and four extension lines having a length of a quarter wavelength in terms of the wavelength in the medium at the center frequency in the operating frequency band. An additional line having a characteristic impedance value lower than the characteristic impedance values of the two main lines and the coupling line and having one end grounded is connected to the input / output terminal of the extension line. The directional coupler added in parallel is a constituent element.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram of a signal synthesis circuit according to Embodiment 1 of the present invention. In the figure, 8a, 8b, 8c and 8d are conventional directional couplers 1
Main lines 2a, 2b and input / output lines 5a, 5b, 5c, 5
d, and the extension line 8 is 2
It has a characteristic impedance value similar to that of the main line 2, and its length is about a quarter wavelength in terms of the wavelength in the medium at the center frequency in the operating frequency band. 9 in the figure
Is an inductor formed by a microstrip line on the dielectric substrate 7, 10 is a capacitor, and 11 is a ground terminal. LC by connecting inductor 9 and capacitor 10
A parallel circuit 12 is configured, and the LC parallel circuit 12 includes extension lines 8a, 8b, 8c, 8d and input / output lines 5a, 5b, 5
It is added to the ground terminal 11 from between c and 5d.

Next, the operation principle of the signal synthesizing circuit configured as described above will be described. Two main line 2a of the same directional coupler 1 and description of the conventional signal synthesizing circuit, 2b and the coupling line 4a, 4b of the characteristic impedance value of each Z _2, Z _1, the length l _2, l _1, Let γ ₂ and γ ₁ be the propagation constants,
The characteristic impedance value of the extension lines 8a, 8b, 8c, 8d is Z ₃ , the length is l ₃ , and the propagation constant is γ ₃ .
Further, assuming that the inductance of the inductor 9 of the LC parallel circuit 12 is L and the capacitance of the capacitor 10 is C, an equivalent circuit display is shown in FIG. This circuit is also symmetric with respect to the plane AA, as in FIG. 16 which is an equivalent circuit diagram of the conventional example, and the scattering matrix [S _e ] when the directional coupler 1 is excited in even mode and the odd mode is excited. The value of the scattering matrix [S] can be obtained from Equation 12 by using the scattering matrix [S _o ]. The equivalent circuit of FIG. 2 can be represented by a cascade connection of seven circuit elements. FIG. 3 shows an equivalent circuit in the case of even mode excitation, and FIG. 4 shows an equivalent circuit in the case of odd mode excitation.
It is. In the case of even mode excitation, the circuit element I in FIG.
_{Is the} [F _eI ], the F matrix of the circuit element II is [F _II ],
Assuming that the F matrix of the circuit element III is [F _III ] and the F matrix of the circuit element IV is [F _IV ], the F matrix [F _e ] of the directional coupler 1 is expressed by the following equation 13 as a cascade connection of the F matrix of the circuit element. Is represented by

[0028]

(Equation 13)

As in the conventional example, the F matrix [F _eI ] of the circuit element I is given by _equation (2), and the F matrix [F _II ] of the circuit element II is given by _equation (3).
Is represented by The expression indicating the F matrix [F _III ] of the circuit element III that is the extension line 8 is expressed by Expression 14, and the LC parallel circuit 12
The equation indicating the F matrix of the circuit element IV is

[0030]

[Equation 14]

[0031]

(Equation 15)

In Equation 15, ω is the angular velocity and the frequency f
There is a relationship of Equation 16 between

[0033]

(Equation 16)

In the case of the odd mode excitation, if the F matrix of the circuit element I in FIG. 4 is [F _oI ], the F matrix of the circuit element II is [F _II ], and the F matrix of the circuit element III is [F _III ], The F matrix [F _o ] of the sexual coupler 1 is expressed by Expression 17 as a cascade connection of the F matrix of the circuit element.

[0035]

[Equation 17]

As in the conventional example, the F matrix [F _oI ] of the circuit element I is given by _equation (5), and the F matrix [F _II ] of the circuit element II is given by _equation (3).
Is represented by An equation indicating the F matrix [F _III ] of the circuit element III which is the extension line 8 and an equation indicating the F matrix of the circuit element IV which is the LC parallel circuit 12 are the same as those in the case of even mode excitation, respectively. is there.

The circuit shown in FIG. 22, which is an example of the frequency response calculation of the conventional signal synthesizing circuit, includes an extension line 8 and an LC parallel circuit 12.
13 is added as a circuit element III and a circuit element IV, and the frequency response of the signal synthesis circuit having the transmission line parameters shown in FIG. 5 is expressed by Expressions 13, 14, 15, 15, 16, 17, 2, 3, 5, Formula 8, Formula 9, Formula 10, Formula 11, Formula 12
FIG. 6 shows the results obtained by the above. 0.3d distribution amplitude ratio
B is less than or equal to about 20% in a bandwidth BW1,
Frequency bandwidth BW at which the reflected output amplitude is -20 dB or less
2 is about 19% in the fractional band, and the frequency bandwidth BW3 in which the decoupling output amplitude is -20 dB or less is about 19% in the fractional band, and both are greatly widened as compared with the example in the conventional signal synthesis circuit. You can see that there is.

Embodiment 2 FIG. 7 is a configuration diagram of a signal synthesis circuit according to Embodiment 2 of the present invention. 8 in the figure
Reference numerals a, 8b, 8c and 8d denote extension lines connected between the main lines 2a and 2b of the conventional directional coupler 1 and the input / output lines 5a, 5b, 5c and 5d. And has a characteristic impedance value similar to that of the main line 2, and its length is about a quarter wavelength in terms of the wavelength in the medium at the center frequency in the operating frequency band. In the figure, reference numeral 13 denotes extension lines 8a, 8b, 8c, 8d and input / output lines 5a, 5b,
This is an additional line grounded to the ground terminal 11 from between 5c and 5d. The additional line 13 has an appropriate length of about a quarter wavelength in terms of the wavelength in the medium when the frequency is the center in the operating frequency band, and furthermore, the two main lines 2 of the directional coupler 1. And has a low characteristic impedance value with respect to the coupling line 4.

Next, the operation principle of the signal synthesizing circuit configured as described above will be described. As in the description of the first embodiment, the two main lines 2a and 2b and the coupling line 4 of the directional coupler 1
a, 4b and the extension lines 8a, 8b, 8c, 8d are Z ₂ , Z ₁ , Z ₃ , the length is l ₂ , respectively.
Assuming that l ₁ , l ₃ and the propagation constants are γ ₂ , γ ₁ , and γ ₃ , the characteristic impedance value of the additional line 13 is Z ₄ , the length is l ₄ , and the propagation constant is γ ₄ , the equivalent circuit is shown in FIG. It becomes 8. This circuit is also a plane AA as in FIG. 16 which is an equivalent circuit diagram of a conventional example and FIG. 2 which is an equivalent circuit diagram of the first embodiment.
And using the scattering matrix [S _e ] when the directional coupler 1 is excited in the even mode and the scattering matrix [S _o ] when the directional coupler 1 is excited in the odd mode, the value of the scattering matrix [S] is calculated from Expression 12. You can ask. The equivalent circuit of FIG. 2 can be represented by a cascade connection of seven circuit elements. FIG. 9 shows an equivalent circuit in the case of even mode excitation, and FIG. 10 shows an equivalent circuit in the case of odd mode excitation. In the case of even mode excitation, the F matrix of the circuit element I in FIG. 9 is [F _eI ] and the F matrix of the circuit element II is [F _eI ].
_II ], the F matrix of the circuit element III is [F _III ], and the F matrix of the circuit element V is [F _V ], the F matrix [F _e ] of the directional coupler 1 is a cascade connection of the F matrix of the above circuit element. Equation 1
It is represented by 8.

[0040]

(Equation 18)

As in the conventional example, the F matrix [F _eI ] of the circuit element I is represented by the following _equation (2), and the F matrix [F _II ] of the circuit element II is represented by the following _equation (3).
Further, similarly to the first embodiment, the F matrix [F _III ] of the circuit element III is represented by Expression 14. The expression indicating the F matrix of the circuit element V that is the additional line 13 is represented by Expression 19.

[0042]

[Equation 19]

In the case of the odd mode excitation, the F matrix of the circuit element I in FIG. 4 is [F _oI ], the F matrix of the circuit element II is [F _II ], the F matrix of the circuit element III is [F _III ], and the circuit element is Assuming that the F matrix of _V is [F _V ], the F matrix [F _o ] of the directional coupler 1 is expressed by the following equation 2 as a cascade connection of the F matrix of the above circuit element.
It is represented by 0.

[0044]

(Equation 20)

As in the conventional example, the F matrix [F _oI ] of the circuit element I is given by _equation (5), and the F matrix [F _II ] of the circuit element II is given by _equation (3).
Further, similarly to the first embodiment, the F matrix [F _III ] of the circuit element III is represented by the following equation (14), and the circuit element V
The F matrix [F _V ] is represented by Expression 19.

The circuit element IV of the LC parallel circuit 12 is removed from the circuit of FIG. 5, which is an example of the frequency response calculation of the first embodiment, and the additional line 13 is replaced with the circuit element V in place of the circuit element IV.
The frequency response of the signal synthesis circuit having the transmission line parameters shown in FIG.
0, Equation 2, Equation 3, Equation 5, Equation 8, Equation 9, Equation 10, Equation 11,
FIG. 12 shows the results obtained from Equations 12 and 14. The frequency bandwidth BW1 in which the distribution amplitude ratio is 0.3 dB or less is about 24% in the fractional band, the frequency bandwidth BW2 in which the reflection output amplitude is -20 dB or less is about 16% in the fractional band, and the decoupling output amplitude is -20 dB. The following frequency bandwidth BW3 is about 16% in the fractional band, and it can be seen that the bandwidth is significantly widened as compared with the example of the conventional signal synthesis circuit.

Further, in the first and second embodiments, the case of the signal synthesizing circuit formed on the dielectric substrate 7 has been described. However, the two main lines, the two coupling lines, and the length are approximately four quarters. If an additional line such as an impedance line having a low wavelength of one wavelength can be formed, a transmission line form such as a rectangular coaxial line that does not use a dielectric substrate may be used.

[0048]

According to the first aspect, an extended line having a characteristic impedance value similar to that of the main line of the directional coupler and having a length of about a quarter wavelength and a distributed constant circuit element are provided. L that connects a configurable inductor and capacitor in parallel
By adding the C parallel circuit to each terminal of the directional coupler, there is an effect that the bandwidth of the directional coupler can be widened.

According to the second invention, an extension line having a characteristic impedance value similar to that of the main line of the directional coupler and having a length of about a quarter wavelength, and The same effect as that of the first invention is obtained by adding an additional line having an appropriate length and a low impedance value around the wavelength to each terminal of the directional coupler, and furthermore, a signal combining circuit according to the first invention There is an effect that the number of parts can be further reduced and the size can be reduced.

[Brief description of the drawings]

FIG. 1 is a first embodiment of a signal synthesis circuit according to the present invention;
FIG.

FIG. 2 is a first embodiment of a signal synthesis circuit according to the present invention;
FIG. 3 is a diagram showing an equivalent circuit of a directional coupler which is a component of FIG.

FIG. 3 is a first embodiment of a signal synthesis circuit according to the present invention;
FIG. 6 is a diagram showing an equivalent circuit when a directional coupler, which is a component of the above, is excited in even mode.

FIG. 4 is a first embodiment of a signal synthesis circuit according to the present invention;
FIG. 5 is a diagram showing an equivalent circuit when a directional coupler, which is a component of the above, is excited in an odd mode.

FIG. 5 is a first embodiment of a signal synthesis circuit according to the present invention;
FIG. 6 is a diagram showing transmission line parameters used in the example of frequency response calculation of FIG.

FIG. 6 is a first embodiment of a signal synthesis circuit according to the present invention;
FIG. 5 is a diagram showing an example of frequency response calculation of FIG.

FIG. 7 is a second embodiment of a signal synthesis circuit according to the present invention;
FIG.

FIG. 8 is a second embodiment of a signal synthesis circuit according to the present invention;
FIG. 3 is a diagram showing an equivalent circuit of a directional coupler which is a component of FIG.

FIG. 9 is a second embodiment of a signal synthesis circuit according to the present invention;
FIG. 6 is a diagram showing an equivalent circuit when a directional coupler, which is a component of the above, is excited in even mode.

FIG. 10 is a diagram showing an equivalent circuit when a directional coupler, which is a component of the signal combining circuit according to the second embodiment of the present invention, is excited in an odd mode.

FIG. 11 is a diagram illustrating transmission line parameters used in a frequency response calculation example of the signal synthesis circuit according to the second embodiment of the present invention;

FIG. 12 is a diagram showing a frequency response calculation example of the second embodiment of the signal synthesis circuit according to the present invention;

FIG. 13 is a configuration diagram showing a conventional signal synthesis circuit.

FIG. 14 is a diagram illustrating the operation principle of a directional coupler that is a component of a conventional signal synthesis circuit.

FIG. 15 is a diagram illustrating a conventional signal combining circuit as a four-port network.

FIG. 16 is a diagram showing an equivalent circuit of a directional coupler that is a component of a conventional signal synthesis circuit.

FIG. 17 is a diagram showing an equivalent circuit when a directional coupler, which is a component of a conventional signal synthesis circuit, is excited in even mode.

FIG. 18 is a diagram showing an equivalent circuit when a directional coupler, which is a component of a conventional signal synthesis circuit, is excited in even mode.

FIG. 19 is a diagram showing an equivalent circuit when a directional coupler, which is a component of a conventional signal synthesis circuit, is excited in an odd mode.

FIG. 20 is a diagram illustrating an equivalent circuit when a directional coupler, which is a component of a conventional signal synthesis circuit, is excited in an odd mode.

FIG. 21 is a diagram illustrating transmission line parameters used in a frequency response calculation example of a conventional signal synthesis circuit.

FIG. 22 is a diagram illustrating a frequency response calculation example of a conventional signal synthesis circuit.

[Explanation of symbols]

Reference Signs List 1 directional coupler, 2 directional coupler main line, 3 directional coupler main line input / output terminal, 4 directional coupler coupling line, 5 input / output line, 6 input / output terminal, 7 dielectric Substrate, 8 extension line, 9 inductor, 10 capacitor, 11 ground terminal, 12 LC parallel circuit, 13 additional line.

Claims (2)

[Claims] 1. Two main lines having a predetermined characteristic impedance value and having a length that is an odd multiple of a quarter wavelength at a center frequency in an operating frequency band; Four input / output lines connected to the four input / output terminals of the main line and having the same characteristic impedance values as the two main lines, and two input / output lines orthogonal to the two main lines and In a signal combining circuit having two characteristic lines having characteristic impedance values different from those of the main line and having a length of an odd multiple of a quarter wavelength at the center frequency in the operating frequency band, An extension line having a characteristic impedance value similar to those of the two main lines and having a length of a quarter wavelength at the center frequency in the operating frequency band is used for the four main lines. In addition to the input and output terminals, A signal synthesizing circuit, wherein one end of an LC parallel circuit in which capacitors are connected in parallel is grounded, and the other end is added to each of the input / output terminals of the extension line. 2. A main line having a predetermined characteristic impedance value and having a length of an odd multiple of a quarter wavelength at a center frequency in an operating frequency band; Four input / output lines connected to the four input / output terminals of the main line and having the same characteristic impedance values as the two main lines, and two input / output lines orthogonal to the two main lines and In a signal combining circuit having two characteristic lines having characteristic impedance values different from those of the main line and having a length of an odd multiple of a quarter wavelength at the center frequency in the operating frequency band, An extension line having a characteristic impedance value similar to those of the two main lines and having a length of a quarter wavelength at the center frequency in the operating frequency band is used for the four main lines. In addition to the input and output terminals, the two main lines Having a lower characteristic impedance value than the characteristic impedance value of the circuit and the coupling line,
A signal synthesizing circuit, wherein a line whose one end is grounded is added in parallel to an input / output end of the extension line.