Abstract
An electrically controlled broadband attenuator composed of two p-i-n diode switches and two quadrature hybrid couplers has been newly developed. Its attenuation can be precisely controlled by electrical pulses and also easily measured by counting its pulse repetitions. It can thus be used for broadband microwave measurements, especially noise measurement. When controlled with pulses whose width was 10 μs and repetition frequencies were between 10 and 90 kHz, this attenuator’s attenuation to repetition frequencies was linear for signal frequencies in the range of 2–12 GHz.
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