Reflector antenna with improved return loss

Details Reflector antenna with improved return loss Reflector antenna with improved return loss

1997-05-22

1999-10-26

Wong, Don

Communications: radio wave antennas

Antennas

Wave guide type

343781CA, 343786, 343840, H01Q 1300

Patent

active

059736526

ABSTRACT:
An improved reflector antenna with far improved return loss than prior art subreflector antennas is disclosed herein. The invention uses a circular waveguide antenna feed employing a non-planar, subreflector having a radial cavity which reflects the energy from the waveguide onto a rotationally symmetrical main reflector. The dimensions of the feed tube, the subflector, and the connection between them are chosen to make the total reflection back into the feed tube very close to zero. The dimensions of the antenna feed are also chosen such that its radiation pattern has an amplitude null along the antenna feed axis. This further improves return loss by minimizing the amount of energy from the main reflector that gets directed back into the feed tube. An alternate embodiment features a feed radiation pattern with an asymmetric amplitude taper for improvement of the sidelobe envelope in a preferred plane.

REFERENCES:
patent: 2605416 (1952-07-01), Foster
patent: 3747116 (1973-07-01), Milam
patent: 3983560 (1976-09-01), MacDougall
patent: 4626863 (1986-12-01), Knop et al.
patent: 4673947 (1987-06-01), Newham
patent: 4827277 (1989-05-01), Becker et al.
patent: 4963878 (1990-10-01), Kildal
patent: 4982198 (1991-01-01), Shafai et al.
patent: 5596338 (1997-01-01), Smith

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