Communications: radio wave antennas – Antennas – Wave guide type
Reexamination Certificate
2006-11-08
2008-12-09
Nguyen, Hoang V (Department: 2821)
Communications: radio wave antennas
Antennas
Wave guide type
C343S783000, C343S779000
Reexamination Certificate
active
07463207
ABSTRACT:
A multiple-beam antenna system includes at least one reflector and a cluster of horns for feeding the reflector. A horn of the cluster of horns is configured for providing transmission and reception of signals over respective transmission and reception frequency bands. The horn includes a substantially conical wall having an internal surface with a variable slope. The internal surface of the substantially conical wall includes slope discontinuities. At least one of the slope discontinuities has a diameter greater than 1.7 times the wavelength of the lowest frequency of the transmission frequency band. The diameter is also greater than 1.7 times the wavelength of the highest frequency of the transmission frequency band. In addition, the diameter is greater than 1.7 times the wavelength of the lowest frequency of the reception frequency band, and the diameter is greater than 1.7 times the wavelength of the highest frequency of the reception frequency band. This configuration of the slope discontinuity generates one or more higher order modes of a transverse electric (TE) mode over the transmission and reception frequency bands without generating a transverse magnetic (TM) mode.
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Rao Sudhakar
Tang Mihn
Lockheed Martin Corporation
McDermott Will & Emery LLP
Nguyen Hoang V
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