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ISSN:
1796-2021 (Online); 2374-4367 (Print)
Abbreviated Title:
J. Commun.
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Monthly
DOI:
10.12720/jcm
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College of Engineering, Qatar University, Doha, Qatar
I'm very happy and honored to take on the position of editor-in-chief of JCM, which is a high-quality journal with potential and I'll try my every effort to bring JCM to a next level...
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2023
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Volume 18, No. 10, October 2023
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JCM 2023 Vol.18(10): 608-612
Doi: 10.12720/jcm.18.10.608-612
Design of 2.45GHz Circularly Polarized Tag Antenna
Chung-Long Pan
1
, Shuming T. Wang
1
, Ping-Cheng Chen
2, *
, and Yen-Fu Chen
1
1. Department of Electrical Engineering, I–Shou University, Kaohsiung City, Taiwan; Email: ptl@isu.edu.tw (C. L.P.), smwang@isu.edu.tw (S. T W.), caker123789@gmail.com (Y. F.C.)
2.Department of Intelligent Network Technology, I–Shou University, Kaohsiung City, Taiwan; Email: chen1113@isu.edu.tw (P.C.C.)
*Correspondence: chen1113@isu.edu.tw (C.L.P.)
Manuscript received April 9, 2023; revised May 31, 2023; accepted June 30, 2023.
Abstract
—This paper presents the design and development of a circularly polarized (CP) tag antenna to overcome the polarization mismatch between the reader antenna and the tag antenna in RFID systems. This CP antenna is designed at 2.4 GHz for radio frequency identification (RFID) applications. It consists of a simple square loop loaded with an open gap, two feeding strips, and a matching stub. The antenna is fabricated on an FR4 substrate with a dielectric constant of 4.4, a dielectric loss tangent of 0.02, and a thickness of 0.8mm. In order to achieve conjugate matching between the circular tag antenna and the tag chip, the technique of loading a matching short line on the tag chip was used. Additionally, the radiation of circular polarization (CP) was achieved by placing an open gap and two feeding strips on the square loop. Through electromagnetic simulation analysis, the antenna performance is evaluated. The reflection coefficient (S11) at 2.45 GHz is measured to be - 17.16db, indicating good impedance matching. The 3 dB axial ratio bandwidth is 0.19 GHz (7.7%), covering the frequency range of 2.34 GHz to 2.53 GHz. The 10db power reflection bandwidth is approximately 8.9% (2.33 GHz to 2.55 GHz), ensuring broad operational bandwidth. The antenna also exhibits a favorable antenna gain of 2.29dBi. This study successfully demonstrates the design and performance evaluation of a CP tag antenna for RFID applications
Keywords
—RFID, tag antenna, circularly polarized
Cite: Chung-Long Pan, Shuming T. Wang, Ping-Cheng Chen*, and Yen-Fu Chen, “Design of 2.45GHz Circularly Polarized Tag Antenna," Journal of Communications vol. 18, no. 10, pp. 608-612, October 2023.
Copyright © 2023 by the authors. This is an open access article distributed under the Creative Commons Attribution License (
CC BY-NC-ND 4.0
), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.
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