A circularly polarized differentially fed transmission-line-excited magnetoelectric dipole antenna array for 5G applications

Xuexuan Ruan; Chi Hou Chan

doi:10.1109/TAP.2019.2893197

Author(s)

Related Research Unit(s)

State Key Laboratory of Terahertz and Millimeter Waves (City University of Hong Kong)

Detail(s)

Original language	English
Article number	8620333
Pages (from-to)	2002-2007
Journal / Publication	IEEE Transactions on Antennas and Propagation
Volume	67
Issue number	3
Online published	21 Jan 2019
Publication status	Published - Mar 2019

Link(s)

DOI	DOI https://doi.org/10.1109/TAP.2019.2893197 Final Published version
	Check@CityULib
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85062733834&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(43a01c3e-c270-4842-9e45-fad8fbef2336).html

Abstract

A circularly polarized (CP) differentially fed magnetoelectric dipole (ME-dipole) array is proposed for fifth-generation applications. The proposed transmission-line-excited antenna, fabricated on a printed circuit board, can achieve wide impedance and axial ratio (AR) bandwidths and high gain. The antenna consists of a 2 × 2 ME-dipole array enclosed by a circular cavity. It is modified from our previous work on linearly polarized (LP) array with its element orientation selectively rotated by ±45° with respect to the differentially fed transmission line and the use of sequential rotation technique to generate CP radiation. A differential feed network is utilized to feed the prototype for experiments. Experiments show that the antenna can present an overlapping impedance and AR bandwidth of 32.2% from 52.2 to 72.2 GHz with a broadside left-handed CP gain from 10.2 to 11.8 dBic. The proposed CP antenna retains all the salient features of our previously proposed LP antenna in symmetric and stable radiation patterns and relatively low back radiation levels.