Cassegrain-type feed for an antenna

Details Cassegrain-type feed for an antenna Cassegrain-type feed for an antenna

2006-04-04

2006-04-04

Nguyen, Hoang V. (Department: 2821)

Communications: radio wave antennas

Antennas

Wave guide type

C343S7810CA, C343S7810CA

Reexamination Certificate

active

07023394

ABSTRACT:
A cassegrain-type feed for a parabolic antenna is a dual-band feed and employs a waveguide feeding a dielectric cone feeding a subreflector. The waveguide has an end-portion adjacent a narrow end of the cone. The impedance of an inner wall of the cone is modified by the inclusion of a dielectric sleeve of thickness between ⅙ and ¼ of a wavelength relative to propagation in the sleeve at a mean value of the upper of the two frequency bands concerned. The sleeve helps to provide a rotationally substantially symmetric illumination of the subreflector in the upper frequency band and, when used with a parabolic main reflector, a similarly symmetric illumination of the main reflector also. The sleeve may be replaced by a series of grooves formed in the inner wall of the waveguide end-portion, these grooves being nominally ¼ of a mean wavelength deep.

REFERENCES:
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patent: 5122810 (1992-06-01), Nisbet et al.
patent: 5543814 (1996-08-01), Jenness, Jr.
patent: 5973652 (1999-10-01), Sanford et al.
patent: 6020859 (2000-02-01), Kildal
patent: 0 352 976 (1990-03-01), None
patent: 0 439 800 (1990-12-01), None

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