Jose A Valdez

US Patent:

20150236400, Aug 20, 2015

Filed:

Feb 20, 2014

Appl. No.:

14/185720

Inventors:

- WALTHAM MA, US
Fangchou Yang - El Segundo CA, US
Stan W. Livingston - Buena Park CA, US
Tim Gehle - Buena Park CA, US
Jose I. Valdez - Fullerton CA, US

Assignee:

RAYTHEON COMPANY - WALTHAM MA

International Classification:

H01Q 1/22
G07B 15/06
G06K 7/10
H01Q 3/24
H01Q 21/00

Abstract:

A system for properly illuminating a toll collection zone without illuminating any areas outside the toll collection zone in which vehicles may be found, while minimizing lost tolls due to shadowing of shorter vehicles by taller vehicles. In one embodiment, a linear array antenna is configured to illuminate a rectangular collection zone from a point offset from the center of the roadway. The linear array antenna is configured to produce an asymmetric antenna pattern providing RF illumination over the rectangular collection zone sufficient for reliable reading of vehicle RF tags in the collection zone, and which also minimizes spillover of RF power outside the collection zone.