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. 27, 2014
Filed:
Mar. 13, 2008
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);
Mercyma Dee Balachandran, Ruston, LA (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);
Mercyma Dee Balachandran, Ruston, LA (US);
Abstract
A chipless RFID tag system having a transmitter sending an input signal and a tag substrate. An ID generation circuit on the tag relies on microstrip transmission line patterns which are pre-designed to generate a unique code. The ID generating circuit may be designed based upon the transmission line properties, including signal delay, and/or reflection, and/or phase change. The tag may be formed on a flexible substrate having at least one microstrip and the microstrip having a first portion with a first impedance and a second portion with a second impedance different from the first impedance. The tag may further include a microstrip antenna for communication with the transmitter and a receiver system. The tag may also include sensors for detection of desired substances of interest. The system may further include a receiver detecting at least two reflections from an interface of first and second impedances and identifying relative time domain positions of the reflections to one another.