JPH05167316A - Synthesizer/distributor and its device - Google Patents

Abstract

PURPOSE:To easily test the trouble of a microwave circuit connected to two output terminals or the fault of a resistor by keeping the input sides of the 1st end 2nd 1/4-wavelength lines forming a synthesizer/distributor in an open states respective1.y. CONSTITUTION:The 1st and 2nd 1/4-wavelength lines 1 and 2 having about 1/4 wavelength compared with the frequency of an input signal is set approximate to each other at each of one of both ends of both lines with a smell gap secured between them. Meanwhile each of other ends of both lines 1 and 2 is connected to both ends of a resistor 3. At the same time, the 1st and 2nd output terminals 4 and 5 are connected to the connection points between both lines 1 and 2 and the resistor 3 respectively. In such a constitution, a synthesizer/distributor device is obtained. Furthermore the input side of at least the line 1 or 2 is connected with a metallic foil end an input terminal is provided at the input side of the line 1 or 2. In such a constitution, a synthesizer/distributor is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthesizer / distributor device and synthesizer / distributor used in a microwave circuit.

[0002]

2. Description of the Related Art Conventionally, as a combiner / distributor used in a microwave circuit, a so-called Wilkinson type is often used, which divides one signal into two or combines two signals into one. Used in case.

This type of combiner / distributor is often composed of a high-frequency planar circuit based on a microstrip circuit.

An example of a conventional synthesizer / distributor will be described with reference to FIG.

Reference numerals 1 and 2 are first and second quarter-wavelength lines whose line lengths are approximately one-quarter wavelength with respect to the frequency of the input signal. The first and second quarter-wave lines 1, 2
Are connected to both ends of the resistor 3.

The first and second output terminals 4 and 5 are connected to the connection points between the first and second quarter-wave lines 1 and 2 and the resistor 3. Further, a common input terminal 6 is connected to the input sides of the first and second quarter-wave lines 1 and 2 to form a combiner / distributor.

In the above configuration, the input signal applied to the input terminal 6 passes through the first and second quarter-wave lines 1 and 2 and is in phase with the output terminal 5 and the output terminal 6 for two minutes. And output. Conversely, output terminal 4 and output terminal 5
From, the input signals respectively applied are combined and output to the input terminal 6.

[0008]

By the way, in the image rejection type mixer and the power amplifier, microwave circuits are connected to the output terminals 4 and 5 of the synthesizer / distributor having the above-mentioned configuration, respectively. It is used as if the outputs were recombined.

However, in the above-mentioned combiner / distributor, since the common input terminal 6 is connected to the input side of the first and second quarter-wave lines 1 and 2, the combiner / distributor and its output are connected. When the microwave circuit connected to the terminal fails, there is a problem that only one output terminal cannot be separated and independently tested.

There is also a problem that the resistance value of the resistor 3 cannot be measured in a direct current manner.

[0011]

According to the present invention, the line length is narrow on the input side which is one end of the first and second quarter-wavelength lines having a wavelength of about 1/4 of the frequency of the input signal. Place them closely with a gap in between and connect the other end to both ends of the resistor.
The first and second output terminals are connected to the connection points between the first and second quarter-wave lines and the resistor, respectively, to form a combiner / divider device. Then, the input sides of the first and second quarter-wave lines are connected with a metal foil or a wire, and an input terminal is provided on at least one input side of the first or second quarter-wave line. It was a synthesizer / distributor.

[0012]

According to the above construction, the first and second 1/4
In the state where the input side of the wavelength line is not connected by the metal foil, the input side of each of the first and second quarter-wave lines is open.

Therefore, in this state, for example, when a signal is input to one of the first and second quarter-wave lines, the connection point between the other quarter-wave line and the resistor is short-circuited. Yes, the output terminal connected to this connection point
No signal is output.

Therefore, even if a microwave circuit is connected to the two output terminals, they can be separated from each other and tested independently. Further, since the input sides of the first and second quarter-wave lines are in the open state, the resistance value of the resistor can be measured in a direct current manner, and the abnormality in the resistance value can be easily measured.

Further, by connecting the open ends of the first and second quarter-wave lines with a metal foil or the like and providing a common input terminal here, a normal Wilkinson type distributor can be obtained. ..

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same parts as those of the related art will be denoted by the same reference numerals, detailed description thereof will be omitted, and the configuration of the present invention different from the related art will be mainly described.

First and second quarter-wave lines 1, 2
Are connected to both ends of the resistor 3. The input sides of the first and second quarter-wave lines 1 and 2 are close to each other with a narrow gap. The first and second output terminals 4 and 5 are connected to the connection points between the first and second quarter-wave lines 1 and 2 and the resistor 3, respectively. Then, for example, input terminals 6a and 6b are provided on the input sides of the first and second quarter-wave lines 1 and 2 to configure a combiner / distributor device.

When the device for combiner / distributor having the above-mentioned configuration is a Wilkinson distributor, the input sides of the first and second quarter-wave lines 1 and 2 are metal foils as shown by dotted lines. 7 or connect with wire.

With the above construction, if an input signal is applied from the input terminal 6a in the manufacturing process of the distributor, for example, in a state where the input sides of the first and second quarter-wave lines are not connected by metal foil or the like. Of the output terminals 4 and 5, only the output terminal 4 outputs. Since the input side of the second 1/4 wavelength line 2 is in an open state, the output terminal 5 is in a short-circuited state and no signal is output from the output terminal 5.

On the contrary, if an input signal is applied from the input terminal 6b, it is output from the output terminal 5 and no signal is output from the output terminal 4.

An example in which an image rejection mixer is constructed by using the synthesizer / distributor having the above construction will be described with reference to FIG. In FIG. 2, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

Mixers 8 and 9 are connected to the output terminals 4 and 5, respectively.
Are connected, and the outputs of the mixers 8 and 9 are combined by the output combining circuit 10.

In the image rejection type mixer having such a structure, when an input signal is applied from the input terminal 6a, the signal is output only from the output terminal 4. Therefore, the mixer 8 can be tested. Further, if an input signal is applied from the input terminal 6b, the signal is output only from the output terminal 5, so that the mixer 9 can be tested.

Since the input sides of the first and second quarter-wave lines 1 and 2 are open, the resistance value of the resistor 3 can be measured and it can be checked whether the resistor 3 is normal. ..

When the image rejection mixer is operated normally, the first and second
The input sides of the / 4 wavelength lines 1 and 2 are connected with a metal foil 7 or the like. In the image rejection mixer described above, the synthesizer / distributor device is used as a distributor, but the synthesizer / distributor device may be used as a combiner.

[0026]

As described above, according to the combiner / distributor of the present invention, the first and second quarter-wave lines 1 and 2 are provided.
If the input side of is not connected, the microwave circuit connected to the two output terminals may have a failure, or
You can easily test the abnormality of the resistor.

By connecting the input sides of the first and second quarter-wave lines 1 and 2 with the metal foil 7,
A synthesizer / distributor that operates normally can be realized.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing an embodiment of a synthesizer / distributor of the present invention.

FIG. 2 is a circuit configuration diagram showing an example in which the synthesizer / distributor of the present invention is used in an image rejection mixer.

FIG. 3 is a circuit configuration diagram showing a conventional combiner / distributor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... 1/4 wavelength line 2 ... 2nd 1/4 wavelength line 3 ... Resistors 4, 5 ... Output terminals 6, 6a, 6b ... Input terminals 7 ... Metal foil 8 ... Mixer 10 ... Output composition circuit

Claims (3)

[Claims] 1. A first and second quarter-wavelength line whose line length is approximately 1/4 wavelength with respect to the frequency of an input signal, and one ends of which are close to each other with a narrow gap therebetween. And the other ends of the first and second quarter-wavelength lines at the connection point between the resistors connected to both ends and the other end of the first and second quarter-wavelength lines and the resistor. At least one of the first and second output terminals connected to each other, a metal foil connecting between one ends of the first and second quarter-wavelength lines, and at least the first or second quarter-wavelength line A combiner / distributor having an input terminal connected to one end. 2. The first and second quarter-wave lines are connected at one end with a wire instead of a metal foil.
The synthesizer / distributor described. 3. A first and second quarter-wavelength line whose line length is approximately 1/4 wavelength with respect to the frequency of an input signal, and one ends of which are close to each other with a narrow gap therebetween. And the other ends of the first and second quarter-wavelength lines at the connection point between the resistors connected to both ends and the other end of the first and second quarter-wavelength lines and the resistor. A combiner / distributor device having first and second output terminals connected to each other.