The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 06, 2007
Filed:
Oct. 06, 2004
Greg Mendolia, Hollis, NH (US);
John Kvarnstrand, Columbia, MD (US);
Bing Foo, Rockville, MD (US);
Cornelius Du Toit, Ellicott City, MD (US);
Nicolaas Du Toit, Columbia, MD (US);
Greg Mendolia, Hollis, NH (US);
John Kvarnstrand, Columbia, MD (US);
Bing Foo, Rockville, MD (US);
Cornelius du Toit, Ellicott City, MD (US);
Nicolaas du Toit, Columbia, MD (US);
Paratek Microwave, Inc., Columbia, MD (US);
Abstract
An embodiment of the present invention provides an RFID tag reading system, comprising an antenna system associated with a portal through which said RFID tag may pass, said antenna system comprising: a plurality of non-uniformly spaced antenna elements arranged substantially linearly; a power divider for dividing transmit power thereby coupling signals to said plurality of antenna elements; and a beamforming network capable of phase shifting the signals between the power divider and the plurality of antenna elements such that radiated signals from each antenna element add coherently such that the radiated electromagnetic energy is focused at a focal point in the near field region or in the Fresnel region of said antenna system.