Communications: radio wave antennas – Antennas – With means for moving directive antenna for scanning,...
Patent
1991-11-21
1994-10-25
Hajec, Donald
Communications: radio wave antennas
Antennas
With means for moving directive antenna for scanning,...
343757, 342359, H01Q 300
Patent
active
053593375
ABSTRACT:
A stabilized antenna system is installed on a moving platform such as a ship to track a communication satellite. The antenna system examply employs either X1-Y-X2 or Y1-X-Y2 antenna mount. Rolling and pitching of the moving platform are offset by mechanically steering outside and intermediate axes, X1 and X, or Y1 and Y axes. The innermost axis is electronically steered to prevent instability which is caused by the mechanical steering, thereby improving reliability of the antenna system. The frame for rotatable supporting the array antenna is also supported by the radome rotatably. Further, the access hutch for maintainance is opened at the center of the radome and just below the array antenna.
REFERENCES:
patent: 4786912 (1988-12-01), Brown et al.
patent: 4833932 (1989-05-01), Rogers
patent: 4920350 (1990-04-01), McGuire et al.
patent: 4994815 (1991-02-01), Nakayama
patent: 5089824 (1992-02-01), Uematsu et al.
patent: 5223845 (1993-06-01), Eguchi
Control Method of 2-Axis Az-E1 Antenna Mount by Hironori Yuki, Yoshio Karasawa, Takayasu Shiokawa and Hirotaka Takeda in Treatises of Electronic Communications of Feb. 24, 1984 pp. 1-6
Development of a Compact Antenna System for the Inmarsat Standard B Ses in Maritime Satellite Communications by Takayasu Shiokawa et al in Treatises of Electronic Communications Society of Aug. 31, 1984 pp. 17-24.
Phased Array Antenna for Marisat Communications by E. Folke Bolinder in Microwave Journal of Dec. 1978 pp. 39-42.
Hajec Donald
Ho Tan
Japan Radio Co. Ltd.
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