James Joseph Sowers

US Patent:

20040102169, May 27, 2004

Filed:

Nov 25, 2002

Appl. No.:

10/304612

Inventors:

Bhaskar Durvasula - Los Altos CA, US
Rolf Klibo - Palo Alto CA, US
Gerald Murdock - Sunnyvale CA, US
James Sawdey - Dublin CA, US
James Sowers - Sunnyvale CA, US

International Classification:

H04B001/00
H04B007/00

US Classification:

455/260000, 455/069000, 455/126000, 455/304000

Abstract:

A system is provided that enables real time active phase control at higher RF signal power levels to be achieved by compensation for phase variations due to daily and lifetime fluctuation of equipment temperature, equipment aging effects and path length changes due to redundancy reconfiguration among others. This automated approach achieves the fastest and most accurate phase correction for efficient signal recombining. The system employs an RF signal which is split into parallel paths whose phase is adjusted employing the output of a feedback device and then amplified and sensed to provide the feedback signal and ultimately recombined.

US Patent:

20180013204, Jan 11, 2018

Filed:

Feb 21, 2017

Appl. No.:

15/438620

Inventors:

- Palo Alto CA, US
Seyed A. Tabatabaei - Mountain View CA, US
James J. Sowers - Sunnyvale CA, US
Walter S. Gelon - Redwood City CA, US
Peter S. Simon - Camarillo CA, US

International Classification:

H01Q 15/14
H01Q 21/22
H01Q 1/28

Abstract:

An imaging array fed reflector for a spacecraft is included in a spacecraft payload subsystem. The payload subsystem includes a multi-beam antenna including a reflector, a plurality of amplifiers, and a plurality of radiating feed elements, the feed elements configured as a phased array, illuminating the reflector, operable at a frequency having a characteristic wavelength (λ), and configured to produce, in a far field at the reflector, a set of contiguous abutting beams. The amplifiers are disposed proximate to the plurality of radiating feed elements. Each radiating feed element has a respective coupling with at least one respective amplifier of the plurality of amplifiers. Each radiating feed element, together with the at least one respective amplifier, is disposed in a closely packed triangular lattice such that separation between adjacent radiating feed elements is not greater than 1.5λ.

Author:

James R. Sowers

ISBN #:

0306457792

Author:

James R. Sowers

ISBN #:

0879333588

Author:

James R. Sowers

ISBN #:

0881673528

Author:

James R. Sowers

ISBN #:

1932610014