Radio frequency identification transponder having a spiral anten

Details Radio frequency identification transponder having a spiral anten Radio frequency identification transponder having a spiral anten

1998-11-13

2000-09-12

Wu, Daniel J.

Communications: electrical

Condition responsive indicating system

Specific condition

3405724, 3405727, 343895, 343872, 343845, 343700MS, G08B 1314

Patent

active

061183792

ABSTRACT:
A radio frequency identification (RFID) transponder (tag) includes a spiral over ground plane antenna. The RFID tag includes a RFID circuitry that may be implemented as an RFID tag integrated circuit and may be mounted on one surface of a substrate such as a printed circuit board. The RFID tag circuitry may be electrically connected to an impedance matching circuit printed on the same side of printed circuit board. The matching circuit is electrically connected to a spiral antenna that may be mounted on same side of the printed circuit board as the tag circuit and matching circuit. The spiral antenna is held a prescribed distance from the ground plane in order to maximize the gain of the RFID tag and to thereby maximize the range of the RFID tag.

REFERENCES:
patent: 3812494 (1974-05-01), Howell et al.
patent: 4123754 (1978-10-01), Armstrong
patent: 5414427 (1995-05-01), Gunnarsson
patent: 5777561 (1998-07-01), Chieu et al.
patent: 5942987 (1999-08-01), Heinrich et al.
patent: 5945938 (1999-08-01), Chia et al.

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