A Miniaturized Wideband Differentially-Fed Dual-Polarized Patch Antenna for 5G/6G mmWave Mobile Terminal Application

A miniaturized wideband differentially-fed (DF) dual-polarized (DP) patch antenna is proposed for the fifth/sixth generation (5G/6G) millimeter-wave (mmWave) mobile terminal application. The coaxial DF structures are employed to excite the parasitic strips, enabling indirect coupling of energy to the radiation patches owning the shorting pins. As a result, a wide overlapped impedance bandwidth of around 60% (23.6-43.5 GHz), high polarization isolation exceeding 60 dB, and a compact size of 4.5mm^*4.5mm^*1mm are successfully achieved. Meanwhile, the antenna element exhibits a consistent gain response, characterized by a peak gain of 7.1 dBi. It also demonstrates stable radiation patterns, accompanied by remarkably low cross-polarization levels below -50 dB. More importantly, the antenna design only utilizes a single-layer dielectric substrate, contributing to low manufacturing complexity and cost. Therefore, the proposed antenna would be a competitive candidate for numerous smartphone designs.