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:
May. 15, 2012
Filed:
Sep. 28, 2007
Khodadad Varahramyan, Ruston, LA (US);
Mangilal Agarwal, Ruston, LA (US);
Sudhir Shrestha, Ruston, LA (US);
Jeevan Kumar Vemagiri, Bothell, WA (US);
Aravind Chamarti, Painted Post, NY (US);
Sireesha Ramisetti, Sunnyvale, CA (US);
Khodadad Varahramyan, Ruston, LA (US);
Mangilal Agarwal, Ruston, LA (US);
Sudhir Shrestha, Ruston, LA (US);
Jeevan Kumar Vemagiri, Bothell, WA (US);
Aravind Chamarti, Painted Post, NY (US);
Sireesha Ramisetti, Sunnyvale, CA (US);
Louisiana Tech Research Foundation, Ruston, LA (US);
Abstract
A chipless RFID tag system having a transmitter sending an input signal and a tag substrate. The tag substrate has at least one microstrip and the microstrip has a first portion with a first impedance and a second portion with a second impedance different from the first impedance. The system further includes a receiver detecting at least two reflections from an interface of the first and second impedances and identifying relative time domain positions of the reflections to one another.