Optoelectronically switched phase shifter for radar and satellit

Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array

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342371, H01Q 322

Patent

active

046865330

ABSTRACT:
This invention utilizes an opto-electronic matrix switch to select a set of fixed value phase shifters. Signals which are selectively phase shifted by this apparatus may be introduced into the signal path of each antenna element of a phased array antenna. In one embodiment the input signal is converted into an intensity modulated optical signal which is then split between paths of different length to provide different delays and hence different phase shifts. The matrix then selects a particular set of the phase shifted signals which are converted back to electrical signals and fed to the antenna array elements.

REFERENCES:
patent: 3307188 (1967-02-01), Marchetti et al.
patent: 4028702 (1977-06-01), Levine
Levine, Arnold; Use of Fiber Optic Frequency and Phase Determining Elements In Radar; May 30-Jun. 1, 1979.

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