Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Reexamination Certificate
2008-05-16
2010-11-16
Tarcza, Thomas H (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
C342S359000, C342S373000
Reexamination Certificate
active
07834807
ABSTRACT:
A retro-directive antenna for communicating with a geostationary satellite autonomously detects the direction from which a signal is received, and transmits a beam that points back along the same direction. An array feed is used to illuminate a parabolic reflector. Each feed element of the retro-directive antenna is associated with a unique pointing direction of the beam in the far field. As the transmit energy is switched to different feed elements, the far-field beam is scanned, making it possible to track a geostationary satellite in a slightly inclined orbit. This eliminates the need for mechanical tracking and maintains high antenna gain in the direction of the geostationary satellite. The use of a toroidal reflector with multiple linear array feeds spaced in the azimuth direction enables multi-beam operation, allowing multiple geostationary satellites, spaced by up to fifteen beam widths in azimuth, to be tracked simultaneously and independently.
REFERENCES:
patent: 3340530 (1967-09-01), Sullivan et al.
patent: 6236363 (2001-05-01), Robbins et al.
patent: 6266528 (2001-07-01), Farzaneh
patent: 6823170 (2004-11-01), Dent
patent: 6847327 (2005-01-01), Yitalo
patent: 2004/0235421 (2004-11-01), Matsuoka et al.
patent: 2005/0059348 (2005-03-01), Chae et al.
patent: 2005/0259006 (2005-11-01), Kim et al.
patent: 2006/0148525 (2006-07-01), Moon et al.
patent: 2007/0080861 (2007-04-01), Norin et al.
Mull Fred H
O'Melveny & Myers LLP
Spatial Digital Systems, Inc.
Tarcza Thomas H
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