Space diversity receiver with combined step and continuous phase

Details Space diversity receiver with combined step and continuous phase Space diversity receiver with combined step and continuous phase

1978-05-12

1979-07-10

Safourek, Benedict V.

325476, H04B 704

Patent

active

041609522

ABSTRACT:
Prior art circuits used in space diversity systems for combining the two received signals employ either continuously variable phase shifters, which have return-to-zero problems, or 90 degree phase steppers which combine the signals to within .+-.45 degrees. Both of these limitations are avoided by the use of the combination of a continuously variable phase shifter (14) and a 90 degree phase stepper (13). Control means (19, 20) are provided for actuating the stepper when the phase shift introduced by the variable phase shifter reaches a prescribed limit.

REFERENCES:
patent: 2786133 (1957-03-01), Dyke
patent: 2955199 (1960-10-01), Mindes
patent: 3582790 (1971-06-01), Curtis
patent: 4075566 (1978-02-01), D'Arcangelis
Diversity Reception and Automatic Phase Correction, by L. Lewin, The Proceeding of the IEEE, vol. 109 Part B. No. 46, Jul., 1962.

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