Communications: radio wave antennas – Antennas – Antenna with parasitic reflector
Reexamination Certificate
2006-04-25
2006-04-25
Dinh, Trinh Vo (Department: 2821)
Communications: radio wave antennas
Antennas
Antenna with parasitic reflector
C343S7810CA
Reexamination Certificate
active
07034771
ABSTRACT:
An antenna system includes a reflector having a modified-paraboloid shape; and a multi-beam, multi-band feed array located at a focal point of the reflector so that the antenna system forms a multiple congruent beams that are contiguous. The system has a single reflector with non-frequency selective surface. The reflector is sized to produce a required beam size at K-band frequencies and is oversized at EHF-band frequencies. The synthesized reflector surface is moderately shaped and disproportionately broadens EHF-band and Ka-band beams compared to K-band beams. The synthesized reflector surface forms multiple beams each having a 0.5-degree diameter at K-band, Ka-band, and EHF band. The multi-beam, multi-band feed array includes a number of high-efficiency, multi-mode circular horns that operate in focused mode at K-band and defocused mode at Ka-band and EHF-band by employing “frequency-dependent” design for the horns.
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Sudhakar K. Rao, “Design and Analysis of Multiple-Beam Reflector Antennas”, IEEE Antennas and Propagation Magazine, vol. 41, pp. 53-59, Aug. 1999; United States.
Bressler David
Rao Sudhakar K.
Dinh Trinh Vo
Shimokaji & Associates P.C.
The Boeing Company
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