Steven Bradshaw

US Patent:

6982969, Jan 3, 2006

Filed:

Sep 28, 1999

Appl. No.:

09/407645

Inventors:

Bruce L. Carneal - Del Mar CA, US
Min Zhu - San Diego CA, US
Steven H. Bradshaw - Escondido CA, US

Assignee:

Tachyon, Inc. - San Diego CA

International Classification:

H04Q 7/38

US Classification:

370329, 370330, 370343, 370478, 370480, 455450, 455509

Abstract:

A system and method for allocating one or more portions of the frequency spectrum among a plurality of radio frequency (RF) transmitters and/or receivers. The system comprises a hub station that dynamically allocates the frequency spectrum in response to demand of the plurality of RF transmitters and/or receivers. Based on the demand, the hub station analyzes the state of performance of one or more groups of RF transmitters and/or receivers, and optimizes utilization of the assigned frequency spectrum.

US Patent:

50309650, Jul 9, 1991

Filed:

Nov 15, 1989

Appl. No.:

7/437410

Inventors:

Pyong K. Park - Agoura Hills CA
Steven E. Bradshaw - West Hills CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H01Q 1310
H01Q 2124

US Classification:

343770

Abstract:

An antenna incorporating a slot and a plurality of ear-like dipole elements. The antenna comprises a ground plane having a slot disposed therein, and a plurality of ear-like elements attached to one side of the ground plane along the elongated edges of the slot. The ear-like elements are oriented orthogonal to the ground plane in the same direction. Typically, the plurality of ear-like elements are disposed in a symmetrically opposed relationship along the elongated edges of the slot. The plurality of ear-like elements typically comprise two generally quadrant-shaped elements having the centers of the respective quadrant-shaped elements are disposed at or near the outer edges of the slot and the outer edge of the elements extend to about the middle of the slot. The ear-like elements may be rotated with respect to the slot in order to fine tune the polarisation direction. In a typical antenna, a plurality of slots are employed, and the present invention permits the use of randomly oriented or regularly spaced slots that are fed by means of conventional rectangular waveguides or boxed stripline.