Parasitic Elements Shorted to Ground to Enhance the Bandwidth of a Dual-Polarized Antenna

An ultra-wideband dual-polarized antenna covering multiple communication standards such as LTE700/GSM850/GSM900 is proposed in this paper. The antenna consists of two dipoles that are perpendicularly placed to each other. The two dipoles can generate +45 degrees/-45 degrees linear polarizations, respectively. Dual-loop structure is utilized as the arm of the dipole, while four parasitic patches with shorting walls are coupled to the dipoles to extend the operating bandwidth. The measured results show that the antenna has an impedance bandwidth of 101.4% (0.54 GHz-1.65 GHz) with a reflection coefficient less than -10 dB. The isolation between the two ports is larger than 22 dB, and the cross-polarization is less than -20 dB over the band. Good unidirectional radiation patterns are obtained.

Automated summary

This paper proposes an ultra-wideband dual-polarized antenna that covers multiple communication standards. The antenna consists of two perpendicular dipoles that generate +45 degrees/-45 degrees linear polarizations. By utilizing a dual-loop structure and parasitic patches, the antenna achieves a wide impedance bandwidth, high isolation, and low cross-polarization.