Dual-Mode Conjoint Patch-Pair for 5G Wideband Patch Antenna Array Application

A dual-mode conjoint patch-pair is presented in this letter. Because the initial frequency ratio between the seventh and fifth modes of the proposed conjoint patch-pair is low, dual-mode characteristic can be easily achieved by further compressing the frequency ratio between these two modes. Through loading two metallized connection vias near the current nulls of the fifth mode, the resonant frequency of the seventh mode can be enormously reduced with little impact on that of the fifth mode, resulting in the realization of frequency-ratio compression. Based on the proposed dual-mode conjoint patch-pair, a broadband 4 × 4 patch antenna arrays is implemented. The measurements of the 4 × 4 array indicate that the achieved -10 dB impedance bandwidth is about 23.7% (23.8-30.2 GHz), which is wide enough to cover the 26 and 28 GHz bands at the same time.