| 摘要 |
A multibeam array antenna system (3) has a matrix configuration defined by first series power feedlines (21, 22) and second series power feedlines (4a to 4h) serially connected to radiation elements (5a to 5h) wherein directional couplers (31a to 31h, 32a to 32h) are provided at intersections of the matrix, respectively. This antenna system (3) comprises a plurality of first phase adjusting delay lines (7a to 7h) connected between output terminals (8a to 8h) and the radiation elements (5a to 5h) whereby the aperture phase distribution deviates symmetrically with respect to the central portion of the aperture as compared to the distribution at the time of the in-phase excitation, thus enabling to considerably suppress spurious lobes appearing due to the configuration of the matrix feed network and to set the crossover level between adjacent beams to be high. Preferably, this antenna system (3) further comprises a plurality of second phase adjusting delay lines (9a to 9h), thus making it possible to reduce frequency variations in the direction of radiating beam.
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