JPS61123201A - Distributor/mixer - Google Patents

Abstract

PURPOSE:To improve the isolation between distributor output terminals by providing between both the terminals of a Wilkinson type distributor/ combiner circuit a sub circuit cancelling leakage between both the distribution output terminals. CONSTITUTION:When a high frequency signal is inputted to, e.g., a terminal 22 of the sub circuit 25, variable coupling capacitors 26, 28 adjust the coupling degree of the high frequency signal and a variable phase shifter 27 adjusts the phase of the high frequency signal so as to apply a high frequency signal of just the same amplitude and opposite phase to a terminal 23 against a high frequency signal leaked via a main circuit 24. The high frequency signal leaked from the terminal 23 is made remarkably small and the very large isolation (inter-terminal coupling attenuation) of >=60-70dB is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a distribution/mixing method used in the distribution or mixing of high frequency radio waves.
Regarding mixers.

[Prior Art and Its Disadvantages] Conventionally, there are distributors having configurations as shown in FIGS. 3 to 5. FIG. 3 shows a Wilkison type distributor, FIG. 4 shows a directional coupler type distributor, and the fifth factor is called a hybrid ring type distributor. In these distributors, 11 is an input terminal, and 12 and 13 are distribution terminals, respectively.

However, in these distributors, the distribution terminals 12°13
There is a drawback that the coupling attenuation layer between the two is usually only about 20 to 306. In addition, even if it is slightly adjusted and manufactured, 4
The limit was to realize a coupler II of about 0.06.

Furthermore, in order to obtain a terminal-to-terminal coupling attenuation of 60 to 706 or more, as shown in FIG.
A method using 11 to 11 is often used, but it has the drawbacks of being large in size and very expensive.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide an inexpensive and small-sized distributor/mixer that can easily obtain a terminal coupling capacity of 60 to 70 d with simple adjustment. It is about providing.

[Summary of the Invention] When the distributor/'a combiner according to the present invention is used, for example, as a distributor, a sub-circuit consisting of a series circuit of a coupling element and a phase shift element is provided between the distribution terminals, and the leaked radio waves and a
By combining the radio waves that have passed through one circuit with the same amplitude and opposite phase, and canceling each other out, a high coupling attenuation between distribution terminals of 60 to 70 d or more is obtained.

[Embodiment of the Invention] Hereinafter, an embodiment in which the present invention is used as a distributor will be described with reference to the drawings. In FIG. 1, 21 represents an input terminal, and 22 and 23 represent distribution terminals. A main circuit 24 is provided between the input terminal 21 and the distribution terminals 22, 23, and a sub-circuit 25 is provided between the distribution terminals 22, 23. The main circuit 24 is a line 24 having a length of a quarter wavelength.
This is a Wilkison type distribution circuit composed of a, 24b and a balance resistor 24C.

On the other hand, the sub-circuit 25 is constituted by a series circuit of a variable coupling capacitor 26, a variable phase shifter 27, and a variable coupling capacitor 28.

In such a distributor, for example, 50
When a load of Ω is connected, when a high frequency radio wave is inputted from the distribution terminal 22, a lil leakage radio wave that is normally attenuated by 20 to 30 d is outputted to the distribution terminal 23 via the main circuit 24.

In the present invention, the sub circuit 25 is designed to have the same amplitude as this radio wave.
The degree of coupling of the variable coupling capacitors 26 and 28 is adjusted, and the variable phase shifter 21 of the 11 circuit 25 is adjusted so that both radio waves have opposite phase shifts. That is, the radio waves passing through the main circuit 24 from the distribution terminal 22 and the radio waves passing through the subcircuit 25 are combined at the distribution terminal 23 with the same amplitude and opposite phase shift, and cancel each other out. ~7
A very large inter-terminal coupling attenuation of 0.06 or more can be obtained.

FIG. 2 is a characteristic diagram of the amount of coupling attenuation between terminals, comparing the conventional distributor and the distributor of the present invention. In the same figure, a
indicates the conventional characteristic, and b indicates the characteristic example of the present invention.

In the above embodiment, the elements constituting the sub-circuit 25 include the variable coupling capacitors 26 and 28 and the variable phase shifter 27! However, other elements may be used as long as the same effect can be obtained. Further, each element does not necessarily have to be a variable element, and may of course be a fixed element.

In addition, in the above embodiment, an example in which the present invention is applied to a distributor has been described, but the input terminal 21 is a mixing terminal,
By using the distribution terminals 22, 23 as input terminals, it is also possible to use it as a mixer.
.

[Effects of the Invention] As described above, according to the present invention, the distribution /a! can obtain a large amount of coupling attenuation between terminals with a simple configuration. A combination can be realized.

Additionally, since there is no need to add octavalent parts such as isolators, it is possible to obtain smaller and cheaper products.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram showing a distributor according to an embodiment of the present invention, FIG. 2 is a terminal coupling attenuation characteristic diagram comparing the present invention and a conventional distributor, and FIGS. Each figure is a circuit configuration diagram showing a conventional distributor. Zl...Input terminal, 22.23...Distribution terminal, 24
...Main circuit, 25...-circuit, 26.28...Variable coupling capacitor, ? 7...Variable phase shifter. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 4 Procedural amendments Showa F-10 January 1, 1? Manabu Shiga, Director General of the Patent Office1, Indication of Case Patent Application No. 59-2440302, Name of Invention Distributor/Mixer (681) Yagi Antenna Co., Ltd.5, Voluntary Amendment 7, Contents of Amendment

Claims (2)

[Claims] (1) A first terminal that serves as an input or output terminal for high-frequency radio waves, and a second terminal that serves as an output or input terminal for high-frequency radio waves, respectively.
, a third terminal, a main circuit that is connected between the first terminal and the second and third terminals and distributes or mixes the high frequency radio waves, and a coupling element and a phase shift element. A distributor/mixer comprising a sub-circuit configured by a series circuit and canceling the level of leakage radio waves from the second terminal to the third terminal of the main circuit. (2) The distributor/mixer according to claim 1, wherein a variable phase shifter is used as a phase shift element of the sub-circuit.