Circularly Polarized Annular Ring Antenna With Wide Axial-Ratio Bandwidth for Biomedical Applications

Li-Jie Xu; Yaming Bo; Wen-Jun Lu; Lei Zhu; Chengfei Guo

doi:10.1109/ACCESS.2019.2915236

IEEE Access (Jan 2019)

Circularly Polarized Annular Ring Antenna With Wide Axial-Ratio Bandwidth for Biomedical Applications

Li-Jie Xu,
Yaming Bo,
Wen-Jun Lu,
Lei Zhu,
Chengfei Guo

Affiliations

Li-Jie Xu: ORCiD; National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology, Nanjing University of Posts and Telecommunications, Nanjing, China
Yaming Bo: National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology, Nanjing University of Posts and Telecommunications, Nanjing, China
Wen-Jun Lu: ORCiD; Jiangsu Key Laboratory of Wireless Communications, Nanjing University of Posts and Telecommunications, Nanjing, China
Lei Zhu: National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology, Nanjing University of Posts and Telecommunications, Nanjing, China
Chengfei Guo: College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing, China

DOI: https://doi.org/10.1109/ACCESS.2019.2915236
Journal volume & issue: Vol. 7
pp. 59999 – 60009

Abstract

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This paper proposes a novel circularly polarized antenna operating at 2.4-2.48-GHz industrial, scientific, and medical (ISM) band for biomedical applications. This proposed structure is developed from a simple pin-loaded patch antenna, whose circular polarization (CP) is mainly attributed to the loading of shorting pins and L-shaped open-end slot. Based on this, pin-loaded annular ring (PLAR) with dual-mode operation is adapted to introduce another resonance. In addition, two closely coupled rectangular patches are added to bring these two resonant frequencies close to each other in muscle. Furthermore, by introducing arc-shaped slots, CP property and improved impedance matching are achieved with size miniaturization. This proposed structure shows a simulated impedance bandwidth of 8% and a wide axial-ratio (AR) bandwidth of 19.1%. Finally, measurement is performed for the proposed antenna, and the results coincide well with the simulation ones, indicating that it is a good candidate for biomedical applications.

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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