Communications: radio wave antennas – Antennas – Wave guide type
Reexamination Certificate
2006-06-22
2008-12-30
Chen, Shih-Chao (Department: 2821)
Communications: radio wave antennas
Antennas
Wave guide type
C343S7810CA, C343S912000
Reexamination Certificate
active
07471255
ABSTRACT:
The present invention relates generally to the field of reflector-type antennas based on the offset Gregorian design having a substantially paraboloidal-shaped primary reflector and a substantially ellipsoidal secondary reflector displaced from the optical axis of the primary reflector. The first focus of the secondary reflector is substantially coincident with the focus of the primary reflector and a feed or detector is placed substantially at the second focus of the secondary reflector. A partially open shroud placed between the primary reflector and the secondary reflector is shown to result in reduced ground interference and improved antenna efficiency and sensitivity.
REFERENCES:
patent: 5426443 (1995-06-01), Jenness, Jr.
patent: 5793334 (1998-08-01), Anderson et al.
D. DeBoer et al, “The Allen Telescope Array”, vol. 5489—Ground-based Telescopes, J.M. Oschmann, Jr. Ed., Proceedings of SPIE Europe: Astronomical Telescopes and Instrumentation, and (to the best of applicant's recollection) first available to conference participants on Jun. 21, 2004.
D. DeBoer, “The Allen Telescope Array”, as presented in vol. 5489, Session 14 of Proceedings of SPIE Europe: Astronomical Telescopes and Instrumentation, Glasgow, Scotland, UK, presentation materials displayed to attendees from 14:00 to 15:50, Friday, Jun. 25, 2004.
Technical Program vol. 5489: “Ground-based Telescopes”, excerpted from Technical Programme of Astronomical Telescopes and Instrumentation, Jun. 21-25, 2004, Glasgow, Scotland, UK, Sponsored by SPIE Europe.
G. Cortes-Medellin, et al, “Noise Contribution Analysis for the Arecibo Gregorian Radio Telescope”, Proceedings of the 1999 Antenna Applications Symposium, Sep. 15-17, 1999, downloaded from: http://www.ecs.umass.edu/ecu/allerton/papers1999/cover.html on Jun. 16, 2006, 13 pgs.
Chen Shih-Chao
Michaelson Peter L.
Michaelson & Associates
The Regents of the University of California
Wolken, Jr. George
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