Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2007-09-21
2009-11-03
Trieu, Van T. (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S572100, C340S572800
Reexamination Certificate
active
07612676
ABSTRACT:
The present invention relates to an RFID Tag and Antenna for use with an RFID tag and a method of radio frequency identification (RFID). The RFID Tag comprises a RFID chip5for storing data, an antenna6and an electromagnetic band gap substrate12. The RFID chip5and the antenna6are mounted above the electromagnetic band gap substrate12. The electromagnetic band gap substrate has a reflection phase which is different from 180° at the operation frequency of the antenna. The electromagnetic band gap substrate enables the RFID to operate even if it is mounted on a conductive object, as the reflection phase is not 180° so it does not destructively interfere with the radiation from the antenna at the operating frequency. Preferably the reflection phase is between 340° and 115° or −95° and 145°. The preferred embodiment uses a band gap substrate having two mushroom-like conductive layers3, 7with a dielectric in between.
REFERENCES:
patent: 6262495 (2001-07-01), Yablonovitch et al.
patent: 6501435 (2002-12-01), King et al.
patent: 6828941 (2004-12-01), King
patent: 6914562 (2005-07-01), Forster
patent: 6999028 (2006-02-01), Egbert
patent: 7042419 (2006-05-01), Werner
patent: 7193563 (2007-03-01), King et al.
patent: 7405707 (2008-07-01), Murofushi et al.
patent: 7411552 (2008-08-01), King et al.
patent: 7535364 (2009-05-01), Sakama et al.
patent: 2007/0241439 (2007-10-01), Chung et al.
Abedin, M. Faisal et al.; “Effects of EBG Reflection Phase Profiles on the Input Impedance and Bandwidth of Ultrathin Directional Dipoles,” IEEE Transaction on Antennas and Propagation, vol. 53, No. 11, Nov. 2005, pp. 3664-3672.
Sievenpiper, Dan et al.; “High-Impedance Electromagnetic Surfaces with a Forbidden Frequency Band,” IEEE Transactions on Microwave Theory and Techniques, vol. 47, No. 11, Nov. 1999, pp. 2059-2074.
Yang, Fan, “Reflection Phase Characterizations of the EBG Ground Plane for Low Profile Wire Antenna Applications,” IEEE Transactions on Antennas and Propagation, vol. 51, No. 10, Oct. 2003, pp. 2691-2703.
Cheng Chi Ho
Gao Bo
Murch Ross David
Yuen Matthew Ming Fai
Hunt, Jr. Ross F.
Stites & Harbison PLLC
The Hong Kong University of Science and Technology
Trieu Van T.
LandOfFree
RFID tag and antenna does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with RFID tag and antenna, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RFID tag and antenna will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4067511