Tag antenna, tag and RFID system using the same

Details Tag antenna, tag and RFID system using the same Tag antenna, tag and RFID system using the same

2008-01-29

2008-01-29

Phan, Tho (Department: 2821)

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

C343S793000

Reexamination Certificate

active

07324058

ABSTRACT:
A communication distance difference due to an attached object can be canceled, and an RFID system can be provided which has approximately the same communication distance regardless of an attached position (surface) of a tag. A tag antenna used for such the RFID system is for transmitting/receiving a radio signal to/from an RFID reader/writer in an RFID system has a pair of antenna elements centered on a feeding point and when a carrier wavelength of the radio signal is λ, each of the pair of the antenna elements includes a dipole portion which has a length from the feeding point of approximate λ/4 and a plurality of bending portions as well as a circular polarized wave generation portion linked to an end of the dipole portion.

REFERENCES:
patent: 4860019 (1989-08-01), Jiang et al.
patent: 5986609 (1999-11-01), Spall
patent: 6147606 (2000-11-01), Duan
patent: 6285342 (2001-09-01), Brady et al.
patent: 6313809 (2001-11-01), Gabriel et al.
patent: 6417816 (2002-07-01), Sadler et al.
patent: 6535175 (2003-03-01), Brady et al.
patent: 6844851 (2005-01-01), Yoon et al.
patent: 2002/0005811 (2002-01-01), Tsai et al.
patent: 2005/0024287 (2005-02-01), Jo et al.
patent: 19703864 (1998-06-01), None
patent: 1 271 692 (2003-01-01), None
patent: 1 542 312 (2005-06-01), None
patent: 2004-334432 (2004-11-01), None
patent: 2005-216077 (2005-08-01), None
patent: WO 00/39894 (2000-07-01), None
Constantine A. Balanis,Antenna Theory: Analysis and Design, New York, NY: John Wiley & Sons, pp. 17-21, no dated.

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