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http://dx.doi.org/10.6109/jkiice.2016.20.1.15

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

Lee, Jong-Ig (Department of Electronics Engineering, Dongseo University)
Yeo, Junho (School of Computer and Communication Engineering, Daegu University)
Baek, Woon-Seok (Department of Computer and Communication Military Science, Dongyang University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.20, no.1, 2016 , pp. 15-21 More about this Journal
Abstract
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.
Keywords
quasi-Yagi antenna; RFID antenna; portable RFID reader; compact antenna; UHF antenna;
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