A New Endfire Phased Array based on Vivaldi Antenna for 5G Applications

This paper proposes a new configuration of an Endfire wide-scaning phased array antenna operating at millimeter wave at 28 GHz. The proposed antenna is considered as low-cost device designed on standard FR4 substrate with a thickness of 0.5 mm, a permittivity of 4.4, and a total size of 44 × 16 mm
²
. Eight Vivaldi antenna elements fed by microstrip lines have been used to form a linear array at the top side of the cellphone PCB. The gain antenna is improved by using a periodic printed metallic strip that act as a directors. This technique achieves a large bandwith of 3 GHz from 26.5 to 29.5 GHz, and a high gain of 15 dBi which is almost stable over a wide scanning angle.