Identical surface shaped reflectors in semi-tandem arrangement

Communications: radio wave antennas – Antennas – With polarization filter or converter

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343781P, 343909, H01Q 1900

Patent

active

056730560

ABSTRACT:
A pair of dual-gridded shaped reflectors (10) and (20) are arranged one behind the other for transmitting and receiving orthogonally polarized energy waves. A front reflector (10) has a first shaped reflective surface (12) formed on a first body surface (14) for providing a first shaped beam coverage. A rear reflector (20) has a second reflective surface (22) formed on a second body surface (24) for providing a second shaped beam coverage. The first and second reflective surfaces (12) and (22) have substantially identical surface contours and include reflective grids (13) and (23). The reflective grids (13) and (23) are orthogonal with respect to each other so as to handle orthogonally polarized energy. The first and second shaped reflective surfaces (12) and (22) are arranged offset and tandem from each other so as to provide first and second focal points (16) and (26) separate from each other while providing substantially identical first and second shaped beam coverages (15) and (25). As a result, the front and rear reflectors (10) and (20) may be fabricated with a single mandrel (30).

REFERENCES:
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Sata et al, "Shaped Beam Patterns of the Offset Composite Reflector Antenna", NEC Researche & Development No. 64, Jan. 1982.
Parekh et al, "Avanced Satcom Communication Antennas", RCA Astro-Electronic, MS-100A.

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