Loss-free scanning antenna

Details Loss-free scanning antenna Loss-free scanning antenna

1980-03-07

1981-06-16

Lieberman, Eli

Communications: radio wave antennas

Antennas

Wave guide type

343839, 343840, H01Q 1919

Patent

active

042740983

ABSTRACT:
A system for, and a method of, scanning a collimated beam of electromagnetic radiation with a very large primary reflector of an antenna system without loss (i.e., with zero phase error) and without moving the primary reflector. The system is a two dimensional scan, loss-free, Cassegrain antenna system which comprises a stationary, parabolic-shaped, primary reflector, and a smaller, movable, parabolic-shaped subreflector, and also a movable, plane wave, electromagnetic radiation beam source interposed between the two reflectors. It is shown that, without moving the primary reflector, the beam can be scanned over wide angles with no phase error in the plane of scan, provided that the source and the subreflector are rotated about the focal point of the antenna in a specific manner. A unique angular relationship between the source and the subreflector is required for each scan angle, and is taught. The method includes the step of using this antenna system in scanning the beam from the primary reflector, without any phase error and without moving the primary reflector.

REFERENCES:
patent: 2976533 (1961-03-01), Salisbury
patent: 3641577 (1972-02-01), Tocquec
patent: 4044361 (1977-08-01), Yokoi et al.
patent: 4062018 (1977-12-01), Yokoi et al.

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