Communications: radio wave antennas – Antennas – Microstrip
Patent
1988-09-06
1990-09-18
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Microstrip
343893, H01Q 138, H01Q 2120
Patent
active
049581627
ABSTRACT:
An antenna for transmitting and/or receiving circularly polarized (CP) electromagnetic radiation throughout a substantial portion of a sphere. A cylindrical waveguide (3,5) is associated with a transmit portion and a receive portion of the antenna, respectively. The outer surface of each waveguide (3,5) is covered with several conductive radiating patches (30,50) equidistant axially and circumferentially arranged. The patches (30,50) may be fed by elongated apertures (51,52) or by coaxial transmission line (41,42). In the former embodiment, CP is present within the waveguide (3,5), while in the latter embodiment, linear polarization is present within the coaxial transmission line (41,42). The individual patches (30,50) radiate CP in a direction normal to the patch (30,50) to produce CP in the broadside direction. The several patches (30,50) arranged in a circularly symmetric fashion working together create, by a process of constructive interference, CP axially, with opposite senses in the forward and reverse directions.
REFERENCES:
patent: 3975733 (1976-08-01), Bogner
patent: 4110751 (1978-08-01), Reggia et al.
patent: 4143377 (1979-03-01), Salvat et al.
patent: 4162499 (1979-07-01), Jones et al.
patent: 4197549 (1980-04-01), Collins
patent: 4297706 (1981-10-01), Nikolayuk
patent: 4323900 (1982-04-01), Krall et al.
patent: 4349824 (1982-09-01), Harris
patent: 4516097 (1985-05-01), Munson et al.
patent: 4527163 (1985-07-01), Stanton
patent: 4605932 (1986-08-01), Butscher et al.
patent: 4612543 (1986-09-01), DeVries
Ohmaru et al., "A Switching Antenna for Spin Stabilized Satellites", NHK Tech. Journal, vol. 22, No. 4, 1970, Japan, pp. 11-31.
Galindo, V., Green, K., "A Near-Isotropic Circularly (i) Polarized Antenna for Space Vehicles", IEEE Transactions on Antennas and Propagation, vol. AP-13, No. 6, Nov. 1965, pp. 872-877.
Y. T. Lo, S. W. Lee, Antenna Handbook, Chapter 21, "Satellite Antennas", by C. C. Han and Y. Hwang, 1988, published by Van Nostrand Reinhold.
Hwang Yeongming
Roberts Thomas E.
Ford Aerospace Corporation
Radlo Edward J.
Wimer Michael C.
Zerschling Keith L.
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