H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
351/5
H01Q 3/22 (2006.01) H01Q 3/40 (2006.01) H01Q 25/00 (2006.01) H04B 7/204 (2006.01)
Patent
CA 1295731
ABSTRACT A steerable beam antenna system for use in satellite communication systems and including a main reflector and an antenna array having a plurality of feed elements is disclosed. The antenna array is positionable at or near at least one focal point of the main reflector, and its feed elements can receive microwaves from or transmit microwaves toward the main reflector. A Butler matrix (110) having multiple input ports (158) and multiple outputs (156) is connected to the array of feed elements and substantially performs a spatial. Fourier transformation on a generated set of signals to be transmitted which have a predetermined phase relationship between the signals, which is necessary to create the steerable beam. The Butler matrix also can perform an inverse spatial transformation on a set of incoming signals focused on the array by the reflector and received by the feed elements. By using a Butler matrix, the antenna system of the present invention is able to communicate with multiple ground stations simultaneously and with high gain using many virtual spot beams, each oriented to a distinct location on the earth that is dependent on the relative frequency of the beam.
552862
Murphy Timothy A.
Renshaw Kenneth H.
Hughes Electronics Corporation
Sim & Mcburney
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