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:
Nov. 25, 2008
Filed:
Aug. 31, 2006
Sean T. Loving, Lafayette, CO (US);
Sayan Chakraborty, Lakewood, CO (US);
Tim Enwall, Boulder, CO (US);
Christopher Chan, Erie, CO (US);
Lee Snook, Golden, CO (US);
Rohit Majhi, Boulder, CO (US);
Sean T. Loving, Lafayette, CO (US);
Sayan Chakraborty, Lakewood, CO (US);
Tim Enwall, Boulder, CO (US);
Christopher Chan, Erie, CO (US);
Lee Snook, Golden, CO (US);
Rohit Majhi, Boulder, CO (US);
SkyeTek, Inc., Westminster, CO (US);
Abstract
A phase shifting diode detector system for an RFID reader. Quarter-wave delay circuitry is coupled between a forward transmitted signal of the RFID reader applied at a first end of the delay circuitry, and a reflected signal returning from an RFID tag applied at a second end of the delay circuitry. The system includes a pair of diode detector bridges, each comprising a series-coupled diode pair configured such that diode polarities in each bridge are reversed relative to the output thereof, to produce opposite rectified signal output polarities. An input to each of the bridges is capacitively coupled, from the junction between each said diode pair, to a respective opposite end of the delay circuitry.