RFID tags with enhanced range and bandwidth obtained by...

Communications: electrical – Condition responsive indicating system – Specific condition

Reexamination Certificate

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Reexamination Certificate

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08077044

ABSTRACT:
Spatial antenna diversity is used with RFID tags to reduce sensitivity to multi-path fading. RFID tags can use a single multi-port chip or multiple multi-port chips. The ports of the chip or chips are coupled to separated feedpoints on one or more antennas.

REFERENCES:
patent: 7535424 (2009-05-01), Henty
patent: 7663544 (2010-02-01), Thomas et al.
patent: 7688267 (2010-03-01), Hill
patent: 7873385 (2011-01-01), Boireau et al.
patent: 2006/0043199 (2006-03-01), Baba et al.
patent: 2006/0174257 (2006-08-01), Arneson et al.
patent: 2006/0273905 (2006-12-01), Choi et al.
patent: 2007/0152830 (2007-07-01), Burr
“The RFID Tag Antenna: Orientation Sensitivity,” Impinj RFID Technology Series, www.impinj.com, 2005, 2 pages.
“Two RF Inputs Make a Better RFID Tag,” Technical White Paper, Symbol—The Enterprise Mobility Company, May 2006, 2 pages.
Collins, J. “Smart Soccer Ball Misses Its Goal,” http://www.rfidjournal.com/article/print/2029, RFID Journal, Dec. 5, 2005, 2 pages.
Dietrich et al. “Spatial, Polarization, and Pattern Diversity for Wireless Handheldd Terminals,” IEEE Transactions on Antennas and Propagation, vol. 49, No. 9, Sep. 2001, pp. 1271-1281.

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