| 摘要 |
A radio frequency identification device and an impedance matching method for the same are provided to rapidly control impedance matching between a tag chip and an antenna by adjusting reactance of impedance through length control of the antenna and a stub unit. A radio frequency identification device includes an antenna(1), a tag chip(3), a conductor pattern unit(2), and a variable conductor bar(4). The antenna transmits a radio frequency identification signal. The tag chip generates the radio frequency identification signal by being separated from the antenna at a predetermined distance. The conductor pattern unit is separated from the antenna at a predetermined distance, has an end electrically connected to the tag chip, and forms one extended antenna together with the antenna. The variable conductor bar variably adjusts a connection position between the conductor pattern unit and the antenna to match impedance between the tag chip and the antenna.
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