Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2008-09-02
2008-09-02
Chen, Shih-Chao (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C340S572100
Reexamination Certificate
active
11195306
ABSTRACT:
An antenna system for a radio frequency identification system comprising: (a) a base; (b) a first patch antenna disposed on the base and having a circular polarization and adapted to convert between electrical signals and electromagnetic fields; and (c) a second patch antenna disposed on the base and having a circular polarization and adapted to convert between electrical signals and electromagnetic fields, the second antenna being disposed at a distance from the first antenna to define a region between the first and the antenna, the second patch antenna being positioned relative to the first patch antenna such that the electromagnetic fields of the two antennas are substantially opposing in the region.
REFERENCES:
patent: 6184841 (2001-02-01), Shober et al.
patent: 6215402 (2001-04-01), Rao Kodukula et al.
patent: 6255993 (2001-07-01), Greeff et al.
patent: 6281794 (2001-08-01), Duan et al.
patent: 6683570 (2004-01-01), Skladany et al.
patent: 7023342 (2006-04-01), Corbett et al.
patent: 7068224 (2006-06-01), Carrender et al.
patent: 2003/0160725 (2003-08-01), Baxter et al.
patent: 0 301 580 (1989-02-01), None
patent: 0 434 268 (1991-06-01), None
patent: 0 516 440 (1992-12-01), None
patent: WO 97/43799 (1997-11-01), None
patent: WO 03/034349 (2003-04-01), None
patent: WO 2004/017462 (2004-02-01), None
Declaration by Stephen J. Driscoll dated Dec. 30, 2005 including photographs of the ThingMagic RFID antenna system.
Dan Handelsman, How do patch antennas work? Apr. 16, 2002 (http://www.antennaex.com/storage/—atheory/000000f6.htm).
RFID Journal, RFID Technology, How does an RFID system work? (http://www.rfidjournal.com/faq/17/58).
Radio Frequency Identification (RFID) from Wikipedia (http://en.wikipedia.org/wiki/RFID), Jan. 31, 2005.
Callewaert Clyde
Lannon Matthew
Chen Shih-Chao
M/A-COM, Inc.
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