Polarization-Reconfigurable Antenna Array for Millimeter-Wave 5G

Emad Al Abbas,Amin M Abbosh,Ahmed Toaha Mobashsher,Nghia Nguyen-Trong

doi:10.1109/access.2019.2939815

Abstract

The design of 5G 4-element antenna array system with the capability of switching its operation between right hand circular polarization (RHCP) and left hand circular polarization (LHCP) is proposed. The CP-reconfigurability is achieved by electronically switching two PIN-diode pairs in the feeding circuit, which consists of a branch line coupler and two feeding arms. The proposed configuration reduces the number of tuning elements and allows the use of imperfect PIN diodes at millimeter-wave frequency. The fabricated prototype exhibits a 3-dB axial ratio bandwidth from 27.2 to 28.35 GHz. A maximum measured gain of about 6 dBic and a radiation efficiency of around 51% over the bandwidth are achieved for both CP states.

Highlights

Circular polarization (CP) is the key feature in antenna design to mitigate the misalignment and multipath interferences
A polarization-reconfigurable array for 5G applications at 28 GHz is presented. This 4-element antenna array can switch its operation between 2 rotating modes (RHCP and left hand circular polarization (LHCP)) using only 4 PIN diodes in the feeding circuit
We show the optimized performance of the complete feeding circuit for the 4-element patch array (Fig. 5)

Summary

INTRODUCTION

Circular polarization (CP) is the key feature in antenna design to mitigate the misalignment and multipath interferences. A polarization-reconfigurable array for 5G applications at 28 GHz is presented This 4-element antenna array can switch its operation between 2 rotating modes (RHCP and LHCP) using only 4 PIN diodes in the feeding circuit. The branch-line coupler generates equal amplitude and −90◦ phase difference between the output ports (ports 2 and 3) In both cases, since the length of each input arm is either λg or λg/2, the arm connected to a diode in the OFF-state works as an open-ended stub [22], [23] and has an infinity. We show the optimized performance of the complete feeding circuit for the 4-element patch array (Fig. 5) In this configuration, two branch-line couplers of Cases A and B are located vertically and connected to a T-junction power divider [22].

RESULT

Findings

CONCLUSION