Array antenna and stabilized antenna system

Communications: directive radio wave systems and devices (e.g. – Directive – Including antenna orientation

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342371, 343757, H01Q 300, H01Q 322

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active

052238458

ABSTRACT:
An array antenna can control directions of beams by phase-shifting signals received and/or transmitted by a plurality of antenna elements. When the antenna elements are arranged two-dimensionally, sidelobes and beamwidth are determined according a distance between two adjacent antenna element columns. The distance between the adjacent columns can be reduced by arranging the antenna elements in a staggered manner, thereby suppressing the sidelobes, and enlarging the width of beams around an XEL axis. A stabilized antenna system controls the direction of the array antenna and beam directivity by compensating for inclination of a moving platform, so that the array antenna can always track a satellite reliably.

REFERENCES:
patent: 4334226 (1982-06-01), Eguchi et al.
patent: 4621266 (1986-11-01), Le Gall
patent: 4649393 (1987-03-01), Rittenbach
patent: 4823134 (1989-04-01), James et al.
Vandenkerckhove, "MAROTS--A European Satellite For Maritime Communication" World Telecommunication Forum Technical Symposium, Switzerland (Oct. 6-8, 1975).
Control Method Of 2-Axis Az-E1 Antenna Mount Hironori Yuki, et al. 1983.
Development Of A Compact Antenna System For The INMARSAT Standard-B SES In Maritime Satellite Communications Takayasu Shiokawa, et al. Aug. 31, 1984.
Phased Array Antenna For MARISAT Communications E. Folke Bolinder, Dec. 1978.
Inmarsat-M System Definition Manual (issue 2).
ETS-V Open Experiment Implementation Review Issued by Ministry of Japanese Posts and Telecommunications, Communications Policy Bureau Jan. 22, 1988.
Airborne Array Antennas For Aeronautical Satellite Communication Masayuki Yasunaga, et al. 1986.

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