A Petal-Shaped Base Station Antenna Array with Down-Tilted Beam for 5G Wireless Communications

This paper proposes a petal-shaped antenna array with a down-tilted beam to serve as a base station for 5G wireless communications. The antenna array consists of 8 elements. Each element is formed by two crossed dipoles having the shape of flower petals. The antenna element covers the frequency band from 3 GHz to 4 GHz with a return loss better than 16 dB (VSWR $\lt1.5)$ and isolation better than 30 dB across the operating frequency band. The array is fed by a feeding network which provides equal power division ratios and a progressive phase shift to support the beam tilting. The array has an overall realized gain of 16 dBi and a polarization purity of 25 dB at the maximum radiating angle. This performance makes the proposed array a good candidate for a base station for 5G wireless communications.