Waveguide transition for flat plate antenna

Details Waveguide transition for flat plate antenna Waveguide transition for flat plate antenna

1994-08-18

1995-12-12

Hajec, Donald T.

Communications: radio wave antennas

Antennas

Microstrip

343846, H01Q 138

Patent

active

054753945

ABSTRACT:
In a flat plate antenna, insertion loss is reduced significantly by providing an extensive waveguide structure at the back of the ground plane of the antenna. Depending on antenna size, the waveguide may feed the antenna at one or a plurality of points. According to a preferred embodiment, the transition from waveguide to stripline is made via a coaxial connection, with a quarter-wave transformation, including mode suppression walls to direct the energy more efficiently. Alternatively, a direct waveguide to stripline transition may be provided. The technique has wide applicability to a number of antenna designs, including single- and dual-polarization structures, and linear and circular polarization operation.

REFERENCES:
patent: 2907033 (1956-10-01), Brown
patent: 3887925 (1975-06-01), Ranghelli et al.
patent: 4376938 (1983-03-01), Toth et al.
patent: 4651159 (1987-03-01), Ness
patent: 4761654 (1988-08-01), Zaghlouh
patent: 4835540 (1989-05-01), Haruyama et al.
patent: 4999592 (1991-03-01), Kanda et al.
patent: 5005019 (1991-04-01), Zaghlouh et al.
Koichi Ito et al., "Planar antenna for satellite reception", IEEE, vol. 34, No. 4, Dec. 1988, pp. 457-464.

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