Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1985-10-01
1990-11-20
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
H04B 7185
Patent
active
049721518
ABSTRACT:
A satellite communication system employing a satellite in a geostationary orbit about the earth for communicating with ground stations disposed along a region of the earth positioned along an arc of a great circle of the earth. The satellite carries a frequency-scanning antenna array oriented for scanning a beam of electromagnetic radiation in one plane aligned with the arc of the great circle. Each position of the beam is formed with a different frequency of the radiation. The operating frequency of each ground station is selected to match the frequency of a beam directed from the satellite to the ground station. An antenna assembly formed of two confocal parabolic reflectors provides for a multiplication of the effective aperture of an array of radiating elements of the antenna, and also for a demagnification of a scan angle of radiation emanating from the array of radiating elements.
REFERENCES:
patent: 3331071 (1967-07-01), Preston
Bell Laboratories Record, vol. 58, No. 2, Feb. 1980, D. O. Reudink et al.: "Scanning Spot Beams-A New Approach to Satellite Communications", pp. 38-45.
IEEE Transactions on Antennas and Propagation, vol. AP-24, No. 4, Jul. 1976, M. R. Patel et al.: "Radiation Distortions in Fast Frequency-Scanned Antenna Arrays", pp. 537-539.
IEEE Conference Record of the National Telecommunications Conference, Nov. 30-Dec. 4, 1980, P. R. Hirscher-Marchand et al.: "System Design and Technology Development for an EHF Beam-Hopped Satellite Downlink", pp. 17.5.1-17.5.7.
Journal of Spacecraft and Rockets, vol. 17, Jan.-Feb. 1980, No. 1, D. O. Reudink et al.: "Rapid-Scan Area-Coverage Communication Satellite", pp. 9-14.
Antenna Engineering Handbook, Second Edition, Richard C. Johnson and Henry Jasik, Editors, McGraw-Hill Book Company, "Frequency-Scan Antennas", James S. Ajioka.
Cain David
Denson-Low W. K.
Hughes Aircraft Company
Mitchell S. M.
Tarcza Thomas H.
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