Abstract
This paper presents a broadband dual-polarized omnidirectional antenna with a simple feeding structure. It consists of a monopolar patch element for vertically linear polarization (VP) and a circular printed-dipole array for horizontally linear polarization (HP). The monopolar patch antenna is loaded with shorting vias and coupled ring in order to broaden the VP bandwidth, nevertheless keeping a low profile. The printed dipoles with integrated balun are arranged on a circular substrate and incorporated with a 1-to-4 power divider for achieving the broadband HP omnidirectional radiation. One of the key features is to replace a shorting-via in the monopolar patch by the coaxial line of the HP element, allowing a simple configuration and not affecting the VP radiation. The final design with a profile of 0.28λmin has been fabricated and measured. The measurements result in an overlapped impedance bandwidth of 25.4% (2.2-2.84 GHz) and port-to-port isolation of >33 dB. Also, the antenna achieves the peak gain values of 8.0 and 5.6 dBi for the VP and HP radiations, respectively.
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