Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1983-08-19
1987-08-11
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
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.
Hara Elmer H.
MacDonald Robert I.
Poirier Arthur L.
Blum Theodore M.
Her Majesty the Queen in right of Canada as represented by the
Issing Gregory C.
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