Thomas Carter Crawford

Address:

970 S Foothill Dr, Lakewood, CO 80228

VIN:

5NMSH73E07H093579

Make:

HYUNDAI

Model:

SANTA FE

Year:

2007

US Patent:

6822622, Nov 23, 2004

Filed:

Jul 29, 2002

Appl. No.:

10/208507

Inventors:

Thomas M. Crawford - Westminster CO
P. Keith Kelly - Lakewood CO
Farzin Lalezari - Boulder CO
Theresa C. Boone - Boulder CO

Assignee:

Ball Aerospace Technologies Corp - Boulder CO

International Classification:

H01Q 1502

US Classification:

343909, 343754, 343756

Abstract:

A radio frequency reconfigurable lens is provided. In particular, a lens comprising at least two opposed frequency selective surface sheets is provided. A relative phase shift may be imparted to an incident radio frequency wave by varying the distance between at least some of the unit cells of a first of the FSS sheets and adjacent unit cells on a second of the FSS sheets. In order to provide a desired phase taper across the width of a lens, and/or to provide different phase shift amounts, pairs of FSS surfaces having controllable columns or rows can be cascaded together. According to an additional aspect of the present invention, radio frequency waves can be scanned by cascading multiple tunable stages. The present invention also provides a radio frequency shutter.

US Patent:

7595765, Sep 29, 2009

Filed:

Jun 29, 2006

Appl. No.:

11/479431

Inventors:

Vincent A. Hirsch - Boulder CO, US
Bradley M. McCarthy - Torrance CA, US
Thomas S. Watson - Thornton CO, US
John Mehr - Superior CO, US
Thomas M. Crawford - Westminster CO, US

Assignee:

Ball Aerospace & Technologies Corp. - Boulder CO

International Classification:

H01Q 1/42

US Classification:

343789, 343846, 343873

Abstract:

Embedded surface wave antenna elements incorporating different dielectric materials or other features are provided. The different dielectric materials can arranged adjacent a feed, to absorb energy that can cause undesirable reflections in the antenna element. In addition or alternatively, different dielectric materials can be arranged to alter the velocity of energy through the antenna element, and to control or attenuate the formation of nulls in the far field at angles of interest. The control or attenuation of nulls in the far field at angles of interest can further be controlled through contouring an antenna element ground plane in a lens region of the antenna element. A buried feed arrangement is also described.