Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1988-11-14
1989-11-21
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342354, H01Q 322, H01Q 324, H01Q 326
Patent
active
048825883
ABSTRACT:
A steerable beam antenna system for use in satellite communication systems and including a main reflector and an antenna array having a plurality of feed elements is disclosed. The antenna array is positionable at or near at least one focal point of the main reflector, and its feed elements can receive microwaves from or transmit microwaves toward the main reflector. A Butler matrix having multiple input ports and multiple outputs is connected to the array of feed elements and substantially performs a spatial Fourier transformation on a generated set of signals to be transmitted which have a predetermined phase relationship between the signals, which is necessary to create the steerable beam. The Butler matrix also can perform an inverse spatial transformation on a set of incoming signals focused on the array by the reflector and received by the feed elements. By using a Butler matrix, the antenna system of the present invention is able to communicate with multiple ground stations simultaneously and with high gain using many virtual spot beams, each oriented to a distinct location on the earth that is dependent on the relative frequency of the beam.
REFERENCES:
patent: 3135917 (1964-06-01), Best et al.
patent: 4503434 (1985-03-01), Luh
patent: 4595929 (1986-06-01), Kreutel, Jr.
patent: 4652879 (1987-03-01), Rudish et al.
National Telecommunications Conference, NTC-1980, 30 Nov.-4 Dec., Conference Record, vol. 1 of 4, IEEE (Houston, Texas), P. R. Hirschler-Marchand et al.: "System Design and Technology Development for an EHF Beam-Hopped Satellite Downlink", pp. 17.5.1-17.5.7.
J. P. Shelton and K. S. Kelleher, "Multiple Beams from Linear Arrays", IRE Transactions on Antennas and Propagation, vol. AP-9, No. 2, pp. 154-161, (Mar. 1961).
W. P. Delaney, "An RF Multiple Beam Forming Technique", MIT Lincoln Labs Report, Armed Services Technical Information Agency AD 262017, Aug. 9, 1961.
M. Ueno, "A Systematic Design Formulation for Bulter Matrix Applied FFT Algorithm", IEEE Trans. Antennas and Propagation, vol. AP-29, pp. No. 3, May 1981.
C. Dragone & M. Gans, "Imaging Reflector Arrangements to Form a Scanning Beam Using a Small Array", Bell System Technical Journal, vol. 58, No. 2, pp. 501-515 (Feb. 1979).
Murphy Timothy A.
Renshaw Kenneth H.
Blum Theodore M.
Denson-Low Wanda
Hughes Aircraft Company
Mitchell Steven M.
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