Ninety degree phase stepper

Details Ninety degree phase stepper Ninety degree phase stepper

1978-02-17

1979-05-15

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Delay lines including long line elements

325369, 333103, 333121, H01P 118, H01P 512, H03H 718, H01P 138

Patent

active

041539940

ABSTRACT:
A 90 degree phase stepper is described comprising a tandem array of three, 3 db hybrid couplers where the first and third couplers are of one variety (either 90 degree or 180 degree couplers) and the second is of the other variety. A pair of variable phase shifters are located in the two wavepaths connecting the first and second couplers, and a single variable phase shifter is included in one of the two wavepaths connecting the second and third couplers. Each phase shifter introduces either a zero or a 180 degree phase shift. By the appropriate selection of phase shifts, the phase of the output signal can be stepped in 90 degree increments. The stepper is designed for use in the signal combining circuit of a space diversity system. It is an advantage of the circuit that all of the received signal is preserved.

REFERENCES:
patent: 2786133 (1957-03-01), Dyke
patent: 3058071 (1962-10-01), Walsh et al.
patent: 3419823 (1968-12-01), Seidel
patent: 3582790 (1971-06-01), Curtis
patent: 3996533 (1976-12-01), Lee
patent: 4088970 (1978-05-01), Fasset et al.

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