Satellite broadcasting services are currently provided in Japan using four orbital positions, one operates in the BSS band (11.7 -12.2 GHz) and the other operate in the FSS band (12.2 -12.75 GHz). A number of satellites located in different orbital positions will provide in the future. A commonly used dish antenna can receive signals from only one satellite at a time. A multihorn-feed reflector antenna can receive signals simultaneously from several satellites in different orbital positions, but the number of satellites may be limited by the arrangement of the feed horns. A multi-beam phased-array antenna can receive signals simultaneously from a great number of satellites in different orbital positions.This paper describes the fundamental design of a multi-beam receiving antenna['] and measured results of an experimental model.The multi-beam receiving antenna receive signals simultaneously from many satellites in different orbital positions (Fig.1). Figure 2 shows a block diagram of the antenna. Multiple beams are formed using multiple beam forming circuits, one for each satellite direction. To receive both linearly polarized waves with an arbitrary angle and circularly polarized waves, the waves are received as two orthogonal components.Receive signals from satellites in range of 220 degrees (corresponding 1lO"E -150"E) Suppress interference from adjacent satellites Provide a gain of 32 dBi, which corresponds to the gain of a @I5 cm dish antenna121We designed this antenna to meet the following requirements.
Multi-beam antennaFigure 1 Multi-beam receiving antenna 0-7803-6345-O/OO/$lO.OO 0 2000 IEEE satellite n RHCP circular pol. + (LHW circuit Satellite 2 +v poi. Z Linear poi. circuit +H pol. Satellite 1 -Fv pol.
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