Andrew S Richen

US Patent:

7577464, Aug 18, 2009

Filed:

Jun 17, 2005

Appl. No.:

11/154952

Inventors:

Kenan O. Ezal - Santa Barbara CA, US
Thomas L. Larry - Purcellville VA, US
Andrew S. Richen - Santa Barbara CA, US
Michael R. Wiatt - Ventura CA, US
Craig S. Agate - Moorpark CA, US
Benjamin D. Werner - Santa Barbara CA, US
Michael L. Vanblaricum - Santa Barbara CA, US

Assignee:

Toyon Research Corporation - Goleta CA

International Classification:

H04B 1/00

US Classification:

4555621, 342149, 343818, 343820, 343822

Abstract:

A compact, non-phased-array, electronically reconfigurable antenna (ERA) system with at least two operational modes has a first operational objective that is polarization-sensitive null steering (PSNS) and a second operational objective that is direction-finding (DF). The system can rapidly switch between two operational states. In the first state, the system behaves like a polarization filter (PF) and operates as a controlled reception pattern antenna (CRPA), while in the second state the system behaves as an angle-of-arrival (AOA) sensor and operates as a fixed reception pattern antenna (FRPA). The system may include a spiral-mode antenna with both feed and load ports; a mode-forming network; an electronics package; and feedback control electronics. Radio frequency (RF) interference rejection and RF direction-finding may be performed as well as reduction and/or elimination of multiple jamming signals that are intentionally or unintentionally directed at a Global Positioning System (GPS). The determination of direction and location of the source of jamming signals may also be achieved.

US Patent:

20050088358, Apr 28, 2005

Filed:

Nov 24, 2003

Appl. No.:

10/719011

Inventors:

Thomas Larry - Purcellville VA, US
Michael VanBlaricum - Santa Barbara CA, US
Andrew Richen - Santa Barbara CA, US

Assignee:

TOYON RESEARCH CORPORATION - Goleta CA

International Classification:

H01Q019/10
H01Q019/00

US Classification:

343833000, 343818000

Abstract:

Reconfiguration of parasitically controlled elements in a phased array is used to expand the range of operational functions. Embedded array elements can be frequency tuned, and bandwidth can be improved by using reconfiguration to broaden the bandwidth of the embedded elements. For high gain arrays, beam squint can be a limiting factor on instantaneous bandwidth. Reconfiguration can alleviate this problem by providing control of the element phase centers. Scan coverage can be improved and scan blindness alleviated by controlling the embedded antenna patterns of the elements as well as by providing control of the active impedance as the beam is scanned. Applying limited phase control to the elements themselves can alleviate some of the complexity of the feed manifold. A presently preferred method of designing reconfigurable antennas is to selectively place controlled parasitic elements in the aperture of each of the antenna elements in the phased array. The parasitic elements can be controlled to change the operational characteristics of the antenna element. The parasitic elements are controlled by either switching load values in and out that are connected to the parasitic elements or are controlled by applying control voltages to variable reactance circuits containing devices such as varactors. The parasitic elements can be controlled by the use of a feedback control subsystem that is part of the antenna system which adjusts the RF properties of the parasitic components based on some observed metric. The controllable characteristics include directivity control, tuning, instantaneous bandwidth, and RCS.