Compact Circularly Polarized Microstrip Ring Antenna Using Capacitive Coupling Structure for RFID Readers

Shiji Wu; Jiade Yuan; Jiangcheng Chen; Yujie Li

doi:10.1109/ACCESS.2020.2973719

IEEE Access (Jan 2020)

Compact Circularly Polarized Microstrip Ring Antenna Using Capacitive Coupling Structure for RFID Readers

Shiji Wu,
Jiade Yuan,
Jiangcheng Chen,
Yujie Li

Affiliations

Shiji Wu: ORCiD; College of Physics and Information Engineering, Fuzhou University, Fuzhou, China
Jiade Yuan: ORCiD; College of Physics and Information Engineering, Fuzhou University, Fuzhou, China
Jiangcheng Chen: ORCiD; Center for Wireless Communications–Radio Technologies Research Unit (CWC-RT), University of Oulu, Oulu, Finland
Yujie Li: ORCiD; College of Physics and Information Engineering, Fuzhou University, Fuzhou, China

DOI: https://doi.org/10.1109/ACCESS.2020.2973719
Journal volume & issue: Vol. 8
pp. 32617 – 32623

Abstract

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This paper presents a compact circularly polarized microstrip antenna for radio frequency identification (RFID) readers. The dimensions of the proposed antenna are reduced by etching a cross slot in the radiation patch and loading four grounded coupling patches on the four corners of the radiation patch. An inverted Z-shaped coupling feedline is used to realize circularly polarized operation. The measured -10 dB |S11| bandwidth, 3-dB axial ratio bandwidth and maximum gain are 872-1095 MHz, 888-933 MHz, and 5.52 dBi, respectively, at 922 MHz frequency. The overall dimension of the proposed antenna is 0.36 λgX 0.36 λgX 0.05 λg (λg is the guide wavelength at the center frequency of 915 MHz). The proposed antenna has small size with good overall performance and is suitable for compact RFID devices.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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