Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1984-12-31
1987-02-03
Lieberman, Eli
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343911R, H01Q 1504
Patent
active
046411445
ABSTRACT:
A radio frequency antenna system is provided comprising: a radio frequency lens having a parallel plate region and having disposed along opposing peripheral portions thereof a plurality of array ports and a plurality of beam ports, such array ports being coupled to an array of antenna elements arranged to provide a plurality of differently, directed relatively narrow collimated beams of radio frequency energy from a common aperture, each one of such beams being associated with a corresponding one of the plurality of beam ports; and, means for coupling radio frequency energy directly into the parallel plate region to provide, from the common aperture, a relatively broad beam of radio frequency energy.
In a preferred embodiment of the invention, a plurality of amplifiers is provided, each one of the amplifiers being coupled between an array port and a corresponding one of the antenna elements. With such arrangement, the energy fed directly into the parallel plate region to produce the broad beam passes, for amplification, through the plurality of amplifiers thereby increases the power efficiency of the system in producing the broad beam.
REFERENCES:
patent: 3715749 (1973-02-01), Archer
patent: 3761936 (1973-09-01), Archer et al.
patent: 3964069 (1976-06-01), McDonough
patent: 4490723 (1984-12-01), Hardie et al.
"Wide Angle Microwave Lens for Line Source Applications" by W. Rotman an R. F. Turner (Transactions of Antennas and Propagation, pp. 623-632, published in Nov. 1963 by the Institute of Electronics Engineers, Inc., New York, N.Y.).
Devlin Peter J.
Lieberman Eli
Raytheon Company
Sharkansky Richard M.
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