Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1975-12-19
1977-08-23
Lieberman, Eli
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343778, 333 84M, H01Q 1900
Patent
active
040443604
ABSTRACT:
A space-fed phased-array arrangement in which the plural antenna elements each include first and second (front and rear) individual radiators. Between these input and output radiators, there is a combined controllable phase shifter and controllable electronic switching arrangement. In accordance with external control signals, the amount of phase shift (phase delay) introduced by each element may be controlled, and by appropriate programming of these phase shifts, beam formation and pointing angle may be determined. The electronic switch devices are programmable to convert any or all of the antenna elements to reflector or retro-directing elements whereby a rear-pointing beam may be generated and scanned in substantially the same way as the forward beam is generated and scanned. In the retro-directive (reflective) mode, energy from the primary feed passes bi-directionally through the reciprocal controllable phase shifter sections.
REFERENCES:
patent: 3259902 (1966-07-01), Malech
patent: 3276023 (1966-09-01), Dorne et al.
patent: 3430242 (1969-02-01), Safran
Sanders Bobby J.
Wolfson Ronald I.
International Telephone and Telegraph Corporation
Lieberman Eli
O'Neil William T.
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