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A broadband circularly polarized antenna for millimeter-wave applications

Published online by Cambridge University Press:  08 February 2024

Yue Xie ,
Jianping Zhao ,
Yurong Sun  and
Juan Xu Open the ORCID record for Juan Xu [Opens in a new window]
Yue Xie
Affiliation:
Cyberspace Security Academy, Qufu Normal University, Qufu, China
Jianping Zhao
Affiliation:
Cyberspace Security Academy, Qufu Normal University, Qufu, China
Yurong Sun
Affiliation:
Cyberspace Security Academy, Qufu Normal University, Qufu, China
Juan Xu*
Affiliation:
Cyberspace Security Academy, Qufu Normal University, Qufu, China
*
Corresponding author: Juan Xu; Email: xujuan125@163.com
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Abstract

This paper presents a broadband circularly polarized (CP) antenna array for millimeter-wave applications, and the antenna array has the advantages of wide impedance bandwidth (IBW), novel CP design, and low profile. The antenna unit consists of a two-layer substrate and two pairs of magnetoelectric dipoles. Stepped microstrip lines coupled by rectangular slits form a feeder network for easy integration. The axial ratio bandwidth (ARBW) is extended because a pair of parasitic patches is loaded and an elliptical perturbation is added. The simulation results show that the antenna has an ARBW of 18.6% (26.4–31.9 GHz) and an IBW of 45.5% (20.6–32.7 GHz), with a gain greater than 7.11 dBic in the IBW. To improve the gain of the antenna, a 2 × 2 antenna array is designed, fabricated, and measured. The measured results show that the array has an ARBW of 16.6% (26.42–31.21 GHz), an IBW of 41.6% (22.28–33.97 GHz), a peak gain of 13.89 dBic in the IBW, the cross-polarization levels in the xoz-plane and yoz-plane are above 20 dB, and a radiation efficiency greater than 89%.

Keywords

antenna arraybroadband antennacircularly polarized (CP) antennamagnetoelectric dipole (MED)millimeter-wave
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 8
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Copyright
© The Author(s), 2024. Published by Cambridge University Press in association with the European Microwave Association

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