Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1978-05-19
1980-02-12
Griffin, Robert L.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343100ST, 343100CS, H04B 700
Patent
active
041885783
ABSTRACT:
The present invention relates to a satellite communication system which uses a separate up-link and down-link fixed spot beam for communication with each of a plurality of, for example, spaced-apart high traffic demand ground areas and an up-link and a down-link scanning spot beam for communication with a plurality of, for example, spaced-apart low traffic demand ground areas on a time division multiple access (TDMA) basis. More particularly, a satellite repeater is disclosed for accomplishing the switching of signals concurrently received via the up-link fixed and scanning spot beams to the appropriate down-link fixed and scanning spot beams. Additionally, a transmission and a switching format is disclosed for the efficient multiple access of the low traffic demand ground station areas while still providing minimal buffering demands for the high traffic demand ground station areas.
REFERENCES:
patent: 3406401 (1968-10-01), Tillotson
patent: 3750175 (1973-07-01), Lockerd et al.
patent: 3928804 (1975-12-01), Schmidt et al.
"Intelstat V Standard `C` Earth Station Performance Objectives Applied To a Possible Eastern United States Location", Eascon-77, Rec. of IEEE, pp. 13-1A to 13-1I, M. P. Brown Electronics and Aerospace System Convention, Sep. 77.
"A Scanning Spot Beam Satellite System, BSTJ, vol. 56, No. 8, pp. 1549-1560".
"Characteristics and Applications of Multibeam Spacecraft Antennas", Progress in Astronautics & Aeronautics, vol. 33, pp. 503-531, Apr. 1972, W. G. Schmidt, et al.
"A Satellite-Switched SDMA/TDMA System for a Wideband Multibeam Satellite", International Conference on Communications, vol. 1, pp. 12-7, 12-12, W. G. Schmidt, Jun. 1973.
"Satellite-Switched TDMA: Transponder Switched or Beam Switched", Prog. in Astronautics & Aeronautics, vol. 41, pp. 139-154, W. G. Schmidt, Apr. 1974, pp. 37.5-32 to 37.5-35.
"Spectral Reuse in 12 GHz Satellite Communications Systems", Conf. Rec. I.C.C. 77, vol. 3, Jun. 1977.
Reudink Douglas O.
Yeh Yu S.
Bell Telephone Laboratories Incorporated
Griffin Robert L.
Masinick Michael A.
Pfeifle Erwin W.
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