Communications: directive radio wave systems and devices (e.g. – Directive – Including antenna orientation
Patent
1991-10-10
1993-06-29
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including antenna orientation
342371, 343757, H01Q 300, H01Q 322
Patent
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.
Issing Gregory C.
Japan Radio Co. Ltd.
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