High speed power step attenuator method and apparatus

Details High speed power step attenuator method and apparatus High speed power step attenuator method and apparatus

H - Electricity

01

P

333/84

H01P 1/22 (2006.01)

Patent

CA 1196971

Abstract A high power, high frequency attenuator which provides attenuation steps which are switchable at very high speed, the attenuator implementing a method by which the input signal is split into two separate signals which are then subjected to impedance mismatches in the signal path, so that a portion of the split signal is reflected back to the signal splitter for dissipation there and the remaining portions of the split signal are transmitted to a summing circuit for recombination and output. The value of mismatch imposed determines the degree of attenuation obtained. The splitting of the signal reduces the stress upon the mismatched components as well as permits high switching speeds of the mismatches in and out of the circuit. In one embodiment of the invention directional couplers are used to provide the signal splitting and recombina- tion functions, with the result that high isolation is achieved between the input port and the reflected signal caused by the mismatches.

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