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A Wideband Dual-Polarized Antenna With Enhanced Cross-Polarization Discrimination for Base Station Application

A Wideband ±45° dual-polarized antenna for base station is proposed in this paper. By embedding a pentagonal ring in the square loop dipole and adopting Branch-shaped coupling feeding structure, a wideband impedance bandwidth was achieved. We can also enhance the cross-polarized discrimination (XPD) by adding four vertical parasitic elements. It is shown by simulation and experiment that bandwidth enhanced dual-polarized antenna achieves a wideband of 49.9% (1.64-2.73GHz) for reflection coefficients < -15 dB with an isolation of 28 dB. The enhanced XPD is greater than 20dB in the axial direction and greater than 10dB within ±60° at the horizontal plane. A stable gain of 8.34 ±0.71 dBi over the operating bands and half-power beamwidth of 68.15°±2.75°, suitable for base station applications.