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http://dx.doi.org/10.5515/KJKIEES.2008.19.4.404

Bandwidth Improvement of Circularly Polarized Microstrip Antenna for an UHF RFID Portable Reader  

Kim, Sang-Gi (Department of Radio Science & Engineering, Chungbuk National University)
Choi, Ik-Guen (School of Electrical & Computer Engineering and Telecommunications, Chungbuk National University)
Publication Information
Abstract
In this paper, circular polarized microstrip antenna with a conducted hollow cylinder-typed via around the coaxial probe is proposed to enhance the bandwidth of an RFID portable reader microstrip antenna. An antenna of thickness of 6.4 mm and size of $84{\times}84\;mm$ is manufactured with FR4 substrate and its 10 dB return loss bandwidth is measured to be 92 MHz, which is about three times large than the same size's microstrip antenna without hollow cylindrical via. The measured antenna gain and the axial ratio at each are $0.01{\sim}1.825\;dB$ and $2.3{\sim}8.2\;dB$ within 10 dB return loss bandwidth, respectively.
Keywords
Cylinder; Via; Bandwidth; Gain; Axial ratio; RFID; UHF; Reader; Antenna;
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