Communications: radio wave antennas – Antennas – Antenna with parasitic reflector
Patent
1981-11-12
1985-04-23
Lieberman, Eli
Communications: radio wave antennas
Antennas
Antenna with parasitic reflector
343914, H01Q 1516
Patent
active
045132933
ABSTRACT:
There is disclosed herein an antenna, particularly for use at high frequencies such as approximately one gigahertz and above, which is frequency selective. The antenna design allows signals at a given frequency to be preferentially received, as distinguished from broadband reception. The antenna design can be modified for reception of signals of different given frequencies. The antenna comprises a plurality of parabolic sections in the form of concentric rings or segments with each segment being offset axially from the next adjoining segment to thereby provide an antenna which is relatively flat, or having a low profile, as compared to a standard parabolic antenna. The surface of each segment is a segment of a different focal length parabola, but with each parabolic surface being a function of the signal wavelength (or frequency) to be received by the antenna. The antenna may be round, rectangular or have other shapes. Also disclosed are feed and pick-up arrangements for the antenna. In addition to the frequency selective characteristic of the antenna it can be made from various materials and is relatively simple to manufacture, and its low profile minimizes wind loading and mounting problems, and the like.
REFERENCES:
patent: 1906546 (1933-05-01), Darbord
"Satellite Broadcasting: A Zoned Reflector Aerial for the Domestic Reception of Band VI", British Broadcasting Corporation Research Department, Report No. 1972/10.
Communications Design Group, Inc.
Lieberman Eli
Wimer Michael C.
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