Communications: radio wave antennas – Antennas – Wave guide type
Patent
1987-03-27
1988-07-12
Sikes, William L.
Communications: radio wave antennas
Antennas
Wave guide type
343772, H01Q 1302
Patent
active
047573260
ABSTRACT:
An antenna selectively fed from a square waveguide in one of two orthogonal linear TE.sub.1,0 modes includes a transition between the square waveguide and a larger square horn. A transition arrangement including a plurality of thin conductive elements or vanes is dimensioned and located at the transition to provide a gradual transition between the smaller waveguide dimension and the larger horn dimension in the E plane, and an abrupt transition in the H plane, regardless of the polarization selected. The abrupt transition in the H plane converts some of the TE.sub.1,0 mode energy to the TE.sub.3,0 mode. The radiating aperture is at a predetermined distance from the transition arrangement so that the desired relative phase between the TE.sub.1,0 and TE.sub.3,0 modes may be established. The E-plane aperture distribution is unaffected by the phasing, but the H-plane aperture distribution can be controlled by selection of the appropriate relative phase in order to provide a more linear distribution than TE.sub.1,0. The more linear distribution gives higher directive gain.
REFERENCES:
patent: 2617937 (1952-11-01), VanAtta
patent: 3031661 (1962-04-01), Moeller et al.
patent: 3380057 (1968-04-01), Osborn
patent: 3566309 (1971-02-01), Ajioka
patent: 3696434 (1972-10-01), Sciambi, Jr.
patent: 3701163 (1972-10-01), Grabowski
patent: 4667205 (1987-05-01), Gehin
Samuel Silver and Hubert M. James (editors), Microwave Antenna Theory and Design, Peter Peregrinus Ltd., London, UK, 1984, Section 10-15, "The Box Horn", pp. 377-380.
Berard Jr. Clement A.
General Electric Company
Meise William H.
Sikes William L.
Wimer Michael C.
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