Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1986-08-22
1988-04-05
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455607, 455612, H04B 900
Patent
active
047364637
ABSTRACT:
An optical network (46) for providing a wideband, true time delay phased antenna array (100) with simultaneous multiple beam capability is disclosed. The network (46) is provided for connection between plural beam ports (48-52M) and plural antenna elements (20-24N) for converting a received radio frequency (RF) planar wavefront (10) to plural in-phase signals at one and only one beam port (48-52M) for each respective one of a plurality of directions of wave propagation. The converse is true for a transmitted wave. The network (46) includes a laser (30-34N) for each antenna element (20-24N) or each beam port (48-52N) modulated by RF energy which is separated and delayed via optical dividers (35-39N) connected to optical combiners (40-44M) by optical fibers (46) of different lengths. Substantially all signals then arrive in-phase at one particular beam port (48-52M) for a receiver (56-60M) receiving a wave at one particular corresponding angle. In transmitted waves, appropriate radiations from the phased array ( 400) differ by an amount to effect transmission in one particular direction corresponding to the beam port (208-212M) selected for energization by the transmitter (218).
REFERENCES:
patent: 3878520 (1975-04-01), Wright et al.
patent: 4128759 (1978-12-01), Hunt et al.
patent: 4259746 (1981-03-01), Sandstedt
Beek Leslie Van
Griffin Robert L.
ITT Corporation
Twomey Thomas N.
Walsh Robert A.
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