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. 13, 2001
Filed:
Jan. 12, 1999
Applicant:
Inventor:
Randy Watkins, Chatsworth, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B 1/3184 ;
U.S. Cl.
CPC ...
G08B 1/3184 ;
Abstract
A proximity reader for a radio frequency identification (RFID) system is programmed for determining and storing optimum antenna impedance values to achieve peak antenna resonance at each of multiple operating frequencies. Antenna resonance is peaked at power up and periodically during operation to compensate for environmental detuning influences. The reader scans the multiple frequencies to more effectively search for off-frequency identification tags.