A Wideband Dual-Linearly-Polarized Millimeter Wave Antenna for 5G Terminal Application

In this paper, a low-profile and wideband dual-polarized millimeter wave antenna is proposed for 5G applications. The radiator is comprised by a pair of vertically-stacked elliptical patches for broadening the bandwidth, along with eight and four rectangular slots cut on top and bottom patches for size miniaturization. In order to enable dual-polarized operation, two feeding striplines are orthogonally placed for exciting the stacked patches through two H-shaped apertures cut out on the ground plane. The proposed antenna achieves a footprint of 4.5 mm × 4.5 mm, and a total thickness of 1.57 mm. Six shorting pins are introduced in between two feeding apertures for improving the port isolation. The proposed antenna is fabricated and characterized, achieving a measured bandwidth of 21.8% and a low mutual coupling smaller than -41 dB. The superior performance of the proposed antenna can be a promising element candidate for arrays in 5G terminals and base stations.