Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1983-07-07
1985-12-10
Lieberman, Eli
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343783, 343911L, H01Q 1502
Patent
active
045583242
ABSTRACT:
Multibeam lens antennas are often circular, and utilize propagation in disk-shaped parallel-surface regions. There is phase correction through terms in .theta..sup.2, where .theta. is the angle of an aperture point measured from the boresight direction. In the new designs herein, the lens comprises two portions, each being two closely spaced plates with a dielectric medium between them. One portion is formed as a surface of revolution (cylindrical or conical) with two circular ends, one end being an aperture with element feedpoints coupled to array elements. The other portion is a cap joined to the other end of the first portion. The cap may be a disk or a segment of a sphere. The dimensions and indices of refraction are selected to provide focus points for feed ports, with each focus being for a specific beam direction. The parameters may be selected so that the focus points are within the cap, at the periphery of the cap, or at the aperture. Some of the new designs have phase correction through .theta..sup.2 and .theta..sup.4, while others have phase correction through .theta..sup.2, .theta..sup.4, and .theta..sup. 6.
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Donald H. Archer, "Lens-Fed Multiple Beam Arrays", Electronic Progress (Raytheon Co.), vol. XVI, No. 4, pp. 24-32, Winter 74.
David T. Thomas, "Multiple Beam Synthesis of Low Sidelobe Patterns in Lens Fed Arrays," IEEE Transactions on Antennas and Propagation, vol. AP-26, pp. 883-886, Nov. 1978.
Franz Bernard E.
Lieberman Eli
Singer Donald J.
The United States of America as represented by the Secretary of
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