Communications: radio wave antennas – Antennas – Wave guide type
Patent
1988-09-08
1991-02-26
Hille, Rolf
Communications: radio wave antennas
Antennas
Wave guide type
343772, 333 21A, 333 21R, H01Q 1300
Patent
active
049965352
ABSTRACT:
A hollow waveguide includes a conductive peripheral wall arrangement centered on a longitudinal axis. The waveguide is short-circuited at a first transverse plane. A center conductor is connected to the short-circuit and extends along the longitudinal axis to an abrupt open circuit termination at a second transverse plane. The arrangement is fed at a location between the first and second transverse planes to produce both a fundamental waveguide mode and a center-conductor coupled mode. The fundamental mode has an amplitude taper in the horizontal direction but not in the vertical direction. At the abrupt termination, a higher-order waveguide mode is generated which, when phase-shifted by 180.degree., provides an amplitude taper in a vertical direction. A radiating aperture located near the 180.degree. phase shift point produces a radiation pattern which is similar in both the verticla and horizontal planes.
REFERENCES:
patent: 3351944 (1967-11-01), Dunn et al.
patent: 3458862 (1969-07-01), Franks
patent: 3662393 (1972-05-01), Cohn
patent: 4041499 (1977-08-01), Liu et al.
patent: 4200870 (1980-04-01), Gabbitas
patent: 4658258 (1987-04-01), Wilson
patent: 4757326 (1988-07-01), Profera
General Electric Company
Hille Rolf
Le Hoang-anh
Meise William H.
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