Broadband Dual-Polarized Phased Array with Broadside and Endfire Radiation for 5G Millimeter Wave Communications

A broadband millimeter-wave dual-polarized phased array with broadside and endfire radiation characteristic is proposed. The orthogonally fed square patch element with dual-polarized operation is designed on three substrate layers. From the top to the bottom substrates, the parasitic patch, the driven patch and the slot-coupled feed network are etched. The stacked parasitic patch could expend the bandwidth and improve the gain of the antenna element. Two orthogonal strip feed lines excited by the coaxial lines couple the signal through two H-shaped slots, which results in a high isolation of dual polarization operation. A 3×3 array is formed by placing the element diagonally with the space of 0.36λ ₀ . With the appropriate phase differences of each element, the array can achieve dual-polarized wide-angle beam-scanning performance both in the broadside and endfire direction. The simulated results show that the phased array can operate from 24.5 to 31.3 GHz (24.4%) with |S ₁₁ | less than -10 dB. The array can scan in a range of ±75° at the broadside direction with the gain from 12.7 to 14.1 dBi, and scan 360 °at the endfire direction with the gain from 6.7 to 8.4 dBi. This dual polarized beam scanning array can be used in the wireless mobile terminals for 5G millimeter wave communication applications.