Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TA3
Session:
Number:3TA3-2
A Card-type RFID Antenna with a T-type Matching Circuit for Bandwidth Enhancement
Keisuke Noguchi, Tetsuo Moroya, Motoo Mizusawa, Shin-ichi Betsudan, Shigeru Makino, Takurou Sasaki,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Radio-frequency identification (RFID) has attracted significant attention for sensing systems of worldwide logistics. The frequency band from 860 to 960MHz (universal UHF band) has been allocated for RFID systems in the USA, Europe, and Asian countries. Size reduction, impedance matching, gain enhancement, wideband performance and easy manufacturing of antennas are needed for widely used RFID systems [1]. This paper proposes a card-type RFID antenna consisting of a T-type circuit for the universal UHF band [2]. Equations for the maximum impedance bandwidth are derived with an equivalent circuit of the tag antenna, and dependency of parameters on the bandwidth is discussed. A prototype of the antenna is fabricated for a passive RFID system, and the performance is investigated. Radiation pattern and read range measurements are performed.