A Broadband Differential-Fed Dual-Polarized Hollow Cylindrical Dielectric Resonator Antenna for 5G Communications

Xiaosheng Fang; Kangping Shi; Yuxiang Sun

doi:10.3390/s20226448

A Broadband Differential-Fed Dual-Polarized Hollow Cylindrical Dielectric Resonator Antenna for 5G Communications

Sensors (Basel). 2020 Nov 11;20(22):6448. doi: 10.3390/s20226448.

Authors

Xiaosheng Fang^{1

2}, Kangping Shi^{1

2}, Yuxiang Sun³

Affiliations

¹ Department of Electronic and Information Engineering, Shantou University, Shantou 515000, China.
² Guangdong Provincial Key Laboratory of Digital Signal and Image Processing, Department of Electronic and Information Engineering, Shantou University, Shantou 515000, China.
³ College of Electronics and Information Engineering, Shenzhen University, Shenzhen 518000, China.

Abstract

A broadband differential-fed dual-polarized hollow cylindrical dielectric resonator antenna (DRA) is proposed in this article. It makes use of the HEM₁₁₁, HEM₁₁₃, and HEM₁₁₅ modes of the cylindrical hollow DRA. The proposed DRA is simply fed by two pairs of conducting strips and each pair of strips is provided with the out-of-phase signals. After introducing four disconnected air holes into the DRA, a broadband characteristic is achieved, with little effect on the antenna gain of its higher-order modes. To verify this idea, frosted K9-glass is applied to fabricate the hollow cylindrical DRA. The differential S-parameters, radiation patterns, and antenna gain of the DRA are studied. It is found that the proposed differential-fed dual-polarized DRA is able to provide a broad differential impedance bandwidth of ~68% and a high differential-port isolation better than ~46 dB. Moreover, symmetrical broadside radiation patterns are observed across the whole operating band. The proposed DRA covers the frequency bands including the 5G-n77 (3.4-4.2 GHz), 5G-n79 (4.4-5.0 GHz), WLAN-5.2 GHz (5.15-5.35 GHz), and WLAN-5.8 GHz (5.725-5.825 GHz), which can be used for 5G communications.

Keywords: broadband; differential-fed; dual-polarized; hollow cylindrical DRA.