Low-Profile Vertically Polarized Endfire Phased Array Antenna for 5G mm-Wave Applications

This paper presents a low-profile vertically polarized endfire phased array antenna for millimeter-wave mobile device applications. The proposed array antenna is designed based on a conventional folded slot antenna structure by adding C-shaped via configurations and a coupled double-sided parallel stripline (DSPSL). A cost-effective PCB process is utilized to fabricate the proposed array. The proposed array has a reflection coefficient less than -10 dB over 27.9 GHz-28.78 GHz, the maximum gain is 13.3 dBi and the half-power beamwidth in the E-plane (xz-plane) is 56°. In addition, the proposed antenna has maximum beam steering angles of ±30° in the H-plane (xy-plane).