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:
Feb. 03, 2004
Filed:
Jun. 28, 2000
Murray Schirtzer, Hartsdale, NY (US);
Applied Wireless Identifications Group, Monsey, NY (US);
Abstract
An improved homodyne receiver I/Q receiver for use in RFID and similar applications. The receiver uses a lumped constant network approach to eliminate costly and bulky couplers, circulators and distributed delay lines. A unique single-pole, four-throw ( sp4t) antenna switching arrangement is also provided. The receiver combines small size with improved efficiency and sensitivity to provide a practical, low-cost, hand-held receiver capable of operation over distances of approximately three to five meters. This allows the construction of a hand-held receiver having high performance (i.e., a long reading distance) and good discrimination (i.e., the ability to accurately read closely-spaced tags moving rapidly past a check point). When used with compatible RFID tags, the inventive system may also be used to alter the identification or other information stored within the RFID tags.