Low-Profile Dual-Polarization Patch Antenna for Mm-Wave Applications

A low-profile dual-polarized patch antenna is proposed for millimeter-wave (mmWave) applications. Characteristic mode analysis (CMA) was used to reveal two orthogonal modes that excited the driving patch and the 2×2 patch array. In the proposed antenna, the coupling between the top 2×2 radiator and the middle driving patch can be regulated by through-holes, enabling the mmWave dual-polarized patch antenna to obtain suitable operating bandwidth with a low profile. The proposed antenna with an overall size of 0.34λ
0
×0.34λ
0
×0.05λ
0
operates from 24.1 GHz to 29.7 GHz(-10dB). The simulation shows that the isolation is better than 21 dB, and the peak gain is 6.9 dBi.