Appeal No. 1998-1094
Application 08/497,064
radiation over at least two frequency bands. The invention
uses a unique common-aperture antenna system having first and
second beam antennas. The first beam antenna has a parabolic
reflector and the second beam antenna has an aperture which
goes entirely through the reflector. The invention is further
illustrated below by claim 1.
1. A multi-mode, common-aperture antenna system
comprising:
a first beam antenna having a first antenna feed and a
first beam-forming means for producing a first radiation
pattern along a first beam axis, wherein said first beam-
forming means includes a first radiation-focusing device
having a focal axis and an aperture creating an open space
entirely through said first radiation-focusing device, said
aperture being spaced from a point where said focal axis
intersects the first radiation-focusing device;
a second beam antenna having a second antenna feed and a
second beam-forming means for producing a second radiation
beam pattern along a second beam axis which is spaced from
said first beam axis and which passes through said aperture of
the first radiation-focusing device; and
radiation energy means connected to said first antenna
feed for feeding radiation in a first frequency band, and
connected to said second antenna feed for feeding radiation in
a second frequency band different from said first frequency
band.
The Examiner relies on the following references:
Dupressoir 4,284,991 Aug. 18, 1981
Neff et al. (Neff) DE4110242-A Oct. 2, 1991
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