Communications: radio wave antennas – Antennas – Spiral or helical type
Reexamination Certificate
2008-02-18
2010-10-19
Wimer, Michael C (Department: 2821)
Communications: radio wave antennas
Antennas
Spiral or helical type
C343S7000MS
Reexamination Certificate
active
07817102
ABSTRACT:
An antenna connected to a circuit portion and configured to effect transmission and reception of information by radio communication, the antenna including a driven meander line portion which has a feed section connected to the circuit portion and which is a line conductor formed in a meandering pattern, and a parasitic meander line portion which does not have a feed section connected to the circuit portion and which is a line conductor formed in a meandering pattern, the parasitic meander line portion being positioned relative to the driven meander line portion, so as to influence an input impedance of the driven meander line portion, wherein the driven and parasitic line portions have respective extensions of the line conductors formed at respective opposite longitudinal ends of the antenna. Also disclosed in a transponder in the form of a radio-frequency identification tag including the antenna and capable of radio communication with an interrogator.
REFERENCES:
patent: 3231894 (1966-01-01), Nagai
patent: 4381566 (1983-04-01), Kane
patent: 6642893 (2003-11-01), Hebron et al.
patent: 7109945 (2006-09-01), Mori
patent: 2007/0023525 (2007-02-01), Son et al.
patent: 2004-228797 (2004-08-01), None
Miyazaki Yasumitsu
Taki Kazunari
Baker & Botts, LLP.
Brother Kogyo Kabushiki Kaisha
Miyazaki Yasumitsu
Robinson Kyana R
Wimer Michael C
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