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. 19, 2013
Filed:
Dec. 03, 2009
Mark W. Duron, East Patchogue, NY (US);
Sean A. Connolly, Stony Brook, NY (US);
Richard T. Knadle, Dix Hills, NY (US);
Martin Strzelczyk, New Market, MD (US);
Mark W. Duron, East Patchogue, NY (US);
Sean A. Connolly, Stony Brook, NY (US);
Richard T. Knadle, Dix Hills, NY (US);
Martin Strzelczyk, New Market, MD (US);
Symbol Technologies, Inc., Holtsville, NY (US);
Abstract
A method and device enables improving a signal to noise ratio (SNR) of a backscatter signal received from a radio frequency identification (RFID) tag. The method includes generating a continuous wave (CW) carrier signal at the reader device (step). An amplitude modulation (AM) noise component of the CW carrier signal is then detected (step). The AM noise component is inverted to an inverted noise signal (step), and the inverted noise signal is summed with the CW carrier signal to provide an AM noise cancelled carrier signal (step). The AM noise cancelled carrier signal is then transmitted from an antenna of the reader device (step), and the backscatter signal is received at the reader device in response to transmission of the AM noise cancelled carrier signal (step).