Stepped-reflector antenna for satellite communication payloads

Details Stepped-reflector antenna for satellite communication payloads Stepped-reflector antenna for satellite communication payloads

2006-03-02

2010-06-15

Owens, Douglas W (Department: 2821)

Communications: radio wave antennas

Antennas

Wave guide type

C343S753000, C343S840000, C343S909000

Reexamination Certificate

active

07737903

ABSTRACT:
A stepped reflector for being illuminated by at least one multiple-band feed is provided. The reflector includes a central region and a first annular region with an annular width of w. The first annular region is axially stepped a height h above the central region, where h is approximately equal tom×[Φ±(ϕ⁡(Θ=0)-ϕ⁡(Θ=Θ0))]×π180×λ2⁢π×12,where m is a positive odd integer, Φ is a desired amount of phase shift of an outer region of a phase front for reflecting off of the reflector, φ is a feed phase contribution for an angle Θ, and Θ0is an angle formed between an axis of the at least one feed and a line connecting a phase center of the at least one feed and an inner edge of the at least one annular region.The central region and the annular region of the reflector may be parabolically curved or may alternately be shaped. The reflector may be fed by one or more multiple-band horn antennas.

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