Design of mmWave Multi-sector array Using Bowtie Antenna Elements for 5G Mobile Base Stations

This paper proposes a compact multi-sector array structure based on bowtie antenna elements. The designed array consists of three (1x8) linear arrays to cover 360 degrees . The array is designed to operate at 28 GHz on an RT/Duroid 5880 substrate to meet the high-frequency specifications with a thickness of 1.575 mm and a dielectric constant of 2.2, while the dissipation factor is (0.0009). Each array sector has a dimension of 30.17 mm as width and 6.4 mm as length. A beam steering performance is proved with the capability of switchable beams to offer directional/omnidirectional choices. Simulations results showed that the proposed array exhibits excellent reflection coefficient characteristics along with a high gain of up to 13.5 dBi and high radiation efficiency. Two configurations of array sectors are presented to introduce a flexible control of the array beams.