Compact Dual-Broadband Dual-Polarized Antenna With Additional Ground Platform

Abstract

A compact dual-polarized antenna element covering the frequency bands of 0.773~1.0405 GHz and 1.69~2.83 GHz is proposed in this paper. The nested scheme is adopted and the performances of the lower- and upper-band element are analyzed, respectively. A ground platform in the center of lower-band element lowers the resonance frequency of element, makes the structure compact, and suppress the mutual interference between the lower- and upper-band elements. The simulated and measured results show that the proposed structure has stable smooth radiation patterns and the peak gains of 8.83 and 9.34 dBi for the lower- and upper-band elements, respectively. Based on the proposed elements, an array composed of three lower-band elements and five upper-band elements is designed and measured. The results show that the array achieves a stable flat half-power beamwidth (HPBW), isolation better than 25 dB and cross polarization levels less than -15 dB are obtained. The proposed antenna is a candidate for the multi mobile communication systems.