H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
H01Q 21/30 (2006.01) H01Q 1/28 (2006.01) H01Q 5/00 (2006.01) H01Q 13/02 (2006.01) H01Q 19/17 (2006.01) H04B 7/185 (2006.01)
Patent
CA 2396265
A satellite antenna system employing a dual-band feed horn and dual-band beam forming network. The feed horn provides a common aperture for both satellite uplink and downlink communications signal. The feed horn includes corrugations on an inside surface defining two sets of alternating channels having different depths to create circularly symmetric beams for the uplink and downlink signals. The antenna system includes at least one reflector, where the reflector shape, position, and the configuration of the feed horn, is determined so that the mainlobe of the lower frequency downlink feed signal illuminates the entire reflector, and the mainlobe of the higher frequency uplink feed signal illuminates an inner portion of the reflector. The first sidelobes of the higher frequency feed signal illuminate the outer portion of the reflector so that the uplink and downlink antenna signals have the same beamwidth, and thus cover the same cell size on the Earth.
Chan Ronald Y.
Choung Youn H.
Hamada James S.
Minassian Vrage
Toland Brent T.
Gowling Lafleur Henderson Llp
Northrop Grumman Corporation
Trw Inc.
LandOfFree
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