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International Journal of Antennas and Propagation
Volume 2017, Article ID 3987263, 7 pages
https://doi.org/10.1155/2017/3987263
Research Article

CPW-Fed Wideband Circular Polarized Antenna for UHF RFID Applications

1Department of Information and Communication Engineering, Graduate School, Chosun University, Gwangju, Republic of Korea
2Department of Information and Communication Engineering, Chosun University, Gwangju, Republic of Korea

Correspondence should be addressed to Dong-You Choi; rk.ca.nusohc@iohcyd

Received 21 March 2017; Revised 10 May 2017; Accepted 6 June 2017; Published 16 July 2017

Academic Editor: Ikmo Park

Copyright © 2017 Sun-Woong Kim et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We propose a wide bandwidth antenna with a circular polarization for universal Ultra High Frequency (UHF) radio-frequency identification (RFID) reader applications. To achieve a wide 3 dB axial ratio (AR) bandwidth, three T-shaped microstrip lines are inserted into the ground plane. The measured impedance bandwidth of the proposed antenna is 480 MHz and extends from 660 to 1080 MHz, and the 3 dB AR bandwidth is 350 MHz and extends from 800 to 1155 MHz. The radiation pattern is a bidirectional pattern with a maximum antenna gain of 3.67 dBi. The overall size of the proposed antenna is 114 × 114 × 0.8 mm3.