Communications: radio wave antennas – Antennas – Wave guide type
Patent
1998-10-06
1999-10-26
Wong, Don
Communications: radio wave antennas
Antennas
Wave guide type
343761, 343781P, 343772, H01Q 1919, H01Q 316
Patent
active
059736542
ABSTRACT:
A receiving antenna includes a parabolic reflector and a feed horn. The feed horn includes an electrically conductive wall with an edge forming an aperture. The feed horn further includes a plurality of electrical conductors that extend from the edge to the center of the feed horn in a substantially coplanar relationship with the aperture. Each of the electrical conductors differentially affect a first polarized electrical field perpendicular to the edge adjacent the electrical conductor and a second polarized electrical field parallel to the edge adjacent the electrical conductor. In this manner, the electrical conductors can be configured to reduce the effective aperture of the feed horn in a plane, so that a first polarized horn radiation pattern produced by the feed horn can be circularized. The electrical conductors with respect to a vertical plane preferably match the electrical conductors with respect to a horizontal plane, so that first and second polarized horn radiation patterns produced by the feed horn can be simultaneously circularized. Another receiving antenna includes a splash plate and a feed horn that respectively include opposing edges that form an annular aperture. The feed horn further includes a plurality of electrical conductors that extend from the feed horn edge towards the splash plate edge in a coplanar relationship with the aperture. Again, the electrical conductors can be configured to reduce the effective width of the annular aperture in a plane, so that a first polarized horn radiation pattern produced by the feed horn can be circularized, while at the same time a second polarized horn radiation pattern produced by the feed horn can be circularized.
REFERENCES:
patent: 3031661 (1962-04-01), Moeller et al.
patent: 4380014 (1983-04-01), Howard
patent: 4811028 (1989-03-01), Bryanos
patent: 4939526 (1990-07-01), Tsuda
patent: 4963878 (1990-10-01), Kildal
patent: 5714960 (1998-02-01), Choi
patent: 5774095 (1998-06-01), Louzir
Hosono Kazuo
Karp Arthur
Lusignan Bruce B.
Takagi Tohru
Clinger James
Mitsubishi Electronics America Inc.
Terrastar, Inc.
Wong Don
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