A Wideband Dual-Polarized Antenna for LTE700/GSM850/GSM900 Applications

A novel resonator-loaded wideband dual-polarized antenna is proposed for LTE700/GSM850/GSM900 applications. Four single-polarized miniaturized antenna elements are placed with square arrangement upon the reflector for dual polarization. One pair of parallel elements is for +45° polarization, and the other pair is for -45° polarization. The impedance bandwidth is greatly improved loaded with a resonator. Experimentally, the antenna exhibits a wide impedance bandwidth of 37.5% ranging from 0.67 to 0.98 GHz for |S₁₁|<;-15 dB, high isolation of more than 40 dB, and stable gain of around 9.5 dBi over the whole operating band.