Feed-horn with helical antenna element and converter including t

Details Feed-horn with helical antenna element and converter including t Feed-horn with helical antenna element and converter including t

1996-05-28

1997-12-16

Wimer, Michael C.

Communications: radio wave antennas

Antennas

Wave guide type

343872, 343895, H01Q 1302

Patent

active

056990723

ABSTRACT:
The feed-horn with helical antenna element of this invention comprises (1) a waveguide made of conductive cylinder having a step inside, the inner diameter in the vicinity of the opening face of the waveguide is larger than that of the base of the waveguide, and (2) a helical antenna element disposed at the base axial center of the waveguide. Introduction of the step-formed inside to the waveguide makes it possible to obtain excellent characteristics both of cross polarization and impedance.

REFERENCES:
patent: 3526897 (1970-09-01), Cribb
patent: 4412222 (1983-10-01), Mohring
patent: 4442437 (1984-04-01), Chu et al.
patent: 4622559 (1986-11-01), Shafai et al.
patent: 4672388 (1987-06-01), Grim
patent: 4758841 (1988-07-01), Grim
patent: 4797681 (1989-01-01), Kaplan et al.
patent: 4929962 (1990-05-01), Begout et al.
patent: 5229736 (1993-07-01), Adams et al.
patent: 5453755 (1995-09-01), Nakano et al.
Patent Abstracts of Japan, vol. E 773, No. 3, JP 1-53608(A) Mar. 1989.
Patent Abstracts of Japan, vol. E 1288 No. 77, JP 4-200104(A) Jul. 1992.

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