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Design and analysis of broadband circularly polarized compact planar antennas for 2.45 GHz RFID handheld reader applications

Published online by Cambridge University Press:  08 November 2022

Niraj Agrawal Open the ORCID record for Niraj Agrawal [Opens in a new window] ,
Anil Kumar Gautam Open the ORCID record for Anil Kumar Gautam [Opens in a new window]  and
Karumudi Rambabu
Niraj Agrawal
Affiliation:
Department of Electronics & Communication Engineering, NIET, Greater Noida, Uttar Pradesh 201 306, India
Anil Kumar Gautam*
Affiliation:
Department of Electronics & Communication Engineering, G.B. Pant Engineering College, Pauri Garhwal, Uttarakhand, India
Karumudi Rambabu
Affiliation:
Department of Electrical & Computer Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2V
*
Author for correspondence: Anil Kumar Gautam, E-mail: gautam1575@yahoo.co.in
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Abstract

In this article, an innovative design of a broadband circularly polarized compact planar antenna for RFID (radio frequency identification) receivers is presented. The suggested structure used the concept of slots loaded parasitic element printed underneath a coplanar waveguide-fed radiator to achieve the circularly polarized (CP) radiation and size reduction. A parasitic element loaded with F-slot and L-slot, and a window-type slotted ground plane was used to achieve resonance at 2.45 GHz with right-handed circularly polarized radiation for RFID handheld reader application. Experimental results confirmed that the designed antenna of size 16.5 × 14.8 × 1.6 mm3 attained a −10 dB impedance bandwidth of 15.8% (from 2.330 to 2.716 GHz) and 3 dB AR bandwidth of 3.43% (from 2.410 to 2.494 GHz). An axial ratio of 0.43 dB was achieved in the boresight of the antenna at the 2.45 GHz RFID band. The concept of electric field distribution on the antenna was used to elaborate the excitation of CP radiation in the antenna.

Keywords

2.45 GHzcircular polarizationRFID
Type
RFID and Sensors
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Issue 5 , June 2023 , pp. 764 - 771
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Copyright
© The Author(s), 2022. Published by Cambridge University Press in association with the European Microwave Association

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