| 摘要 |
Microwave semiconductor variable attenuation circuit includes a coupler, two series circuits of inductors and a plurality of means having controllable resistance. Each Inductor of the series circuits has a defined inductance, where one end of the series circuit is connected to a terminal of the coupler. Each of means having controllable resistance respectively being connected to a junction point between two respective inductors of the series circuit. All of means having controllable resistance are controlled on the basis of a common signal is provided at a single terminal. By the above features provided that inductors of defined inductance between the coupler and the means having controllable resistance (e.g. a transistor or diode), the total impedance of the attenuation circuit can be properly set and a performance degradation at high frequency can be avoided.
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