JPH01241202A - High frequency power distribution and synthesization circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a power distribution/synthesis circuit in a high frequency region, and particularly to a circuit configuration suitable for improving isolation between a plurality of input/output lines. .

[Conventional technology]

The conventional input/output line used in this type of circuit is the fifth line.
As shown in the figure, there are 1/4 wavelength transformers 2 and 3 between the input line 1 and the output lines 5 and 6, and a resistor 4 is provided directly between the output lines. Ta. In this case, by setting the characteristic impedance Z of the -wavelength transformer section to 6zO (Zo: impedance of the input/output line) and setting the resistance value to 2Zo, impedance matching of each input/output line can be achieved, and the This circuit provides high isolation and is generally well known as a Wilkinson type distributor.

Also, when one input/output line is branched into two or more input/output lines, if a resistor is inserted between each line in the same way as above, it will not be a perfect Wilkinson type, but the isolation between each line will be reduced. It is known that large amounts can be obtained.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, it is ideal that the resistance section inserted between each branched line is a pure resistance component, and it is necessary to eliminate the reactance component as much as possible.

For this reason, a structure was adopted in which each line was brought as close as possible at the resistance connection portion. When there are two lines to be branched, it is relatively easy to make them approach each other, but when there are multiple branches of two or more, it is extremely difficult to make the lines at each resistance connection point close to each other. A circuit configuration with no resistance and simply impedance matching is often used. For this reason, there was a problem in that isolation between each line could not be achieved and a highly safe distribution/combiner could not be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to provide a distributor/combiner that allows a large distance between lines at resistance connection points, thereby providing sufficient isolation even in a multi-branched circuit.

[Means for Solving Problem 1111] The above purpose is to provide a 1/4 wavelength line at both ends of the resistor instead of a pure resistor, and connect the branched lines with a 1 wavelength line to achieve the target frequency. This is achieved by making it appear as if it were only a pure resistance component.

[Effect]

The basic operation of the present invention will be explained using the equivalent circuit shown in FIG. The explanation will be based on the operation as a distribution line, but in the case of a combiner, it is good to consider the completely opposite operation.

In the figure, a high frequency signal from line 1 is distributed to paths 5 and 6 via line 2.3. Line 2゜3 is an impedance transformer with a length of 1/4 wavelength, and J”iz・
The characteristic impedance is (Z.Characteristic impedance of two-person output line).

Between the output lines 5 and 6 are 1/4 wavelength lines 7 and 8, and a resistor 4 is provided in the middle. In the above configuration, there is no one-wavelength line at the center frequency, and the result is the same as when there is simply a resistor.

Figure 2 shows the case where the center frequency is chosen to be 28 GHz, and the characteristic impedance of the input/output line is 50Ω and the resistance is 10oΩ.
, the characteristics are when the 1/4 wavelength lines sandwiching the resistors are each set to 100Ω, and VSWRl, 5 at fo±20% or more.
As shown below, it can be seen that the input/output matching conditions are sufficiently satisfied.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. Third
The figure is a top view of an embodiment of the power distribution/synthesis circuit according to the present invention. The following explanation will be given regarding the case where it is used as a synthesizer. In the figure, la.

lb, lc, ld are signal input lines, generally 5
A 0Ω line is used. This human signal from track 1 is
- 2a, 2b, 2 forming a wavelength transformer
It is vertically taken out from the central line 5 via lines c and 2d. From the center - 1 between the adjacent lines from the wavelength point
/4 wavelength line 3a.

3a', 3b, 3b', 3c, 3c', 3d.

3d' and resistors 4a, 4b, 4c, and 4d are connected. In this structure, the four input signals from 1 are in phase,
If the amplitudes are the same, they are all combined at the center frequency and taken out from the center line 5, and the isolation between the four lines can be increased.

FIG. 5 shows another embodiment with four lines.

The center line is coaxial, and the lines connecting the four lines are strip lines. In this case, the line section is filled with air, and the strip line section is filled with dielectric material. According to this configuration, the wavelength of the strip line section is 1/1 compared to that of the coaxial section.
``f: terminating (ε, f: effective dielectric constant of the substrate), the line of -wavelength can be configured to be short, and there is no need to bend the line. If the line and line are constructed with lines with different dielectric constants, by appropriately selecting the permittivity of both lines, it is possible to appropriately correspond to the distance between the lines according to the number of distributions.In Fig. 5, 6 is the input line 7 is a dielectric substrate, 8 is a bonding wire, and 9 is an external conductor.

The above explanation took a 4-combination circuit as an example, but the number of combinations is n.
It goes without saying that the present invention can be effectively applied to individual cases.

〔Effect of the invention〕

According to the present invention, even in a multi-branch type circuit configuration, the distance between the lines at the resistor connection point can be increased, so that a configuration in which a resistor is connected between each line can be achieved, thereby reducing the isolation between each terminal. becomes extremely large, and a distribution/synthesis circuit with stable characteristics with little mutual interference between terminals can be realized.

[Brief explanation of the drawing]

FIG. 1 is a basic equivalent circuit diagram of the present invention, FIG. 2 is a characteristic diagram of the equivalent circuit shown in FIG. 1, FIG. 3 is a top view of one embodiment of the present invention, and FIG. FIG. 5 is an equivalent circuit diagram showing a conventional configuration. 1... Human power track, 2... Transformer, 3...
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Claims (2)

[Claims] 1. In a circuit in which multiple input/output lines are connected to one end of one input/output line, 1/
A high-frequency power distribution/synthesis circuit characterized in that a four-wavelength transformer is provided, and a plurality of lines spaced 1/4 wavelength apart from the connection point are connected by a 1-wavelength line with a resistor provided in the middle. 2. In the power distribution/synthesis circuit according to item 1, the high frequency power distribution is characterized in that the dielectric constant of the line portion connecting the lines is made higher than the dielectric constant of the line portion forming the plurality of input/output lines. Synthetic circuit.