Broadband Dual-Polarized Multidipole Antenna for Base Station Applications

Yuxuan Huang,Yuan Liu,Xiaoming Xiong,Zeqi Zhu,Shuting Cai,Giorgio Montisci

doi:10.1155/2021/4206702

Abstract

A wideband dual-polarized multidipole antenna for base station applications is proposed. It consists of a pair of large square-shaped loop dipoles and a pair of small rectangle loop dipoles as radiation elements. A pair of small rectangle loop dipoles is fed by T-shaped feed structure which is in the large square-shaped loop dipoles radiating arm so that the antenna generates an additional resonance and obtains a wider bandwidth. The proposed antenna was fabricated and measured, and the results show that the antenna achieves a wide impedance bandwidth of 63.7 % with VSWR<1.5 covering the frequency range from 1.55 to 3 GHz. A high isolation is better than 29 dB within the operating frequency bandwidth. Moreover, an average gain 8 dBi and a stable radiation pattern with 3 dB beamwidth of 69° ± 4° at H-plane are obtained.

Highlights

IntroductionIn order to achieve wide impedance bandwidth and small size, a number of crossed-dipoles antennas have been proposed for dual-polarized radiation
Wireless communication systems have developed rapidly in recent years
To satisfy the demanding requirements in large cities, the desired antenna should be with good performance, such as wide impedance bandwidth, unidirectional radiation, stable gain, and stable radiation pattern [1]. us, dualpolarized antennas have become very popular in base station since they can reduce side effects of multipath fading and increase channel capacity [2, 3]

Summary

Introduction

In order to achieve wide impedance bandwidth and small size, a number of crossed-dipoles antennas have been proposed for dual-polarized radiation. For different wideband feeding structures, Wen et al [4] proposed a dipole antenna with Y-shaped feeding, which has a wide impedance bandwidth of 27.8% with VSWR < 1.5 (1.7–2.25 GHz). As reported in [5], two pairs of circular slotted square dipoles are fed by two fan-shaped microstrip lines to obtain a bandwidth of 48.2% with VSWR < 1.4 (1.62–2.68 GHz). An antenna has been fed by four capacitive F-probes with two-layer patches in [6], which introduces a balanced feeding structure to realize high isolation and low cross polarization. Huang et al [7]

Methods

Results

Conclusion