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A compact wideband circularly polarized quadrifilar antenna with PIFA elements for UHF RFID readers

Published online by Cambridge University Press:  08 April 2020

Chawanat Lerkbangplad ,
Alongkorn Namahoot ,
Prayoot Akkaraekthalin  and
Suramate Chalermwisutkul Open the ORCID record for Suramate Chalermwisutkul [Opens in a new window]
Chawanat Lerkbangplad
Affiliation:
The Sirindhorn International Thai-German Graduate School of Engineering, King Mongkut's University of Technology North Bangkok, 1518 Pracharat 1 Rd., Wongsawang, Bangsue, Bangkok, Thailand
Alongkorn Namahoot
Affiliation:
Strato Innovations, 111/4 Ratchada-Ramintra Road, Khanna Yao, Bangkok10230, Thailand
Prayoot Akkaraekthalin
Affiliation:
Department of Electrical and Computer Engineering, Faculty of Engineering King Mongkut's University of Technology North Bangkok, 1518 Pracharat 1 Rd., Wongsawang, Bangsue, Bangkok, Thailand
Suramate Chalermwisutkul*
Affiliation:
The Sirindhorn International Thai-German Graduate School of Engineering, King Mongkut's University of Technology North Bangkok, 1518 Pracharat 1 Rd., Wongsawang, Bangsue, Bangkok, Thailand
*
Author for correspondence: Suramate Chalermwisutkul, E-mail: [email protected]
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Abstract

In this paper, a compact circularly polarized quadrifilar antenna with planar inverted-F antenna (PIFA) elements is presented. The proposed antenna consists of four PIFA elements and a Wilkinson divider-based feed network fabricated on FR-4 substrate (ɛr = 4.4, loss tangent = 0.02, thickness = 1.6 mm). The total size of the antenna is 120 × 120 × 13.2 mm3. Impedance matching with a reflection coefficient <−15 dB and an axial ratio (AR) <3 dB are achieved over the global ultra-high frequency (UHF) radio frequency identification (RFID) frequency band and beyond. The realized gain ranges from 2.25 to 3.75 dBic within the frequency band of interest from 860 to 960 MHz with a directional radiation pattern. The proposed antenna is compact, low-cost and extremely wideband in terms of matching and AR compared to state-of-the-art UHF RFID reader antennas.

Keywords

UHF RFIDcircular polarizationquadrifilar antennaFR4planar inverted-F antenna
Type
Antenna Design, Modelling and Measurements
Information
International Journal of Microwave and Wireless Technologies , Volume 12 , Special Issue 10: EuMCE 2019 Special Issue (Part II) , December 2020 , pp. 1020 - 1028
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Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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