Design of a compact quasi-Yagi antenna for portable RFID reader

휴대형 RFID 리더용 소형 준-야기 안테나 설계

Lee, Jong-Ig;Yeo, Junho;Baek, Woon-Seok

  • Received : 2015.09.14
  • Accepted : 2015.10.26
  • Published : 2016.01.31


In this paper, we considered a design method of a compact quasi-Yagi antenna for portable UHF RFID readers. The antenna consists of a dipole driver and a reflector printed on a dielectric substrate, and it is fed by a microstrip line. In order to reduce the antenna size, the dipole and reflector are bent and the balun between the feeding microstrip line and coplanar strip (CPS) line is integrated within the CPS line. The effects of the geometrical parameters of the proposed antenna on the antenna performance are examined, and the parameters are adjusted to be suitable for the operation in UHF RFID band (902-928 MHz). The size of the fabricated antenna is $70mm{\times}75mm$, and the experiment results reveal a frequency band of 892-942 MHz for a voltage standing wave ratio < 2, a gain > 3.5 dBi, and a front-to-back ratio > 6.6 dB over the frequency band for UHF RFID.


quasi-Yagi antenna;RFID antenna;portable RFID reader;compact antenna;UHF antenna


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