A Wideband Dual-Polarized Dipole Antenna With Folded Metallic Plates

A wideband dual-polarized dipole antenna with fourfolded metallic plates is proposed in this letter. The folded metallic plates are vertically placed on the ground plane, under the dipole arms. Owing to the coupling with the nearby dipoles, an additional resonance beside the original impedance passband of the dipole antenna can be generated by the parasitic plates, leading to a very wide operating bandwidth. A prototype was fabricated and tested to verify the design. The measured results show that the prototype has a -10 dB impedance bandwidth of about 92%, a port isolation of over 20 dB, and an average gain of 6.2 dBi within the operating band.

I. Introduction

Currently, dual-polarized antenna is increasingly popular in end user or base station because it can desirably increase the channel capacity and alleviate the multipath fading problem. On the other hand, with the rapid development of wireless communication, the bandwidth requirement of the modern system is higher than ever to make it compatible with multiple communication standards or supportive of high-speed data transmission. Consequently, the design of wideband dual-polarized antennas has received extensive attentions in recent years [1]–[8] .