Broadband dual‐polarized omnidirectional antenna with simple feeding structure

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.

Broadband Circular Polarised Printed Antennas for Indoor Wireless Communication Systems: A Comprehensive Review

“…However, the proposed antenna offers an IBW of 62.6% and ARBW of 37% with an antenna gain of 6 dBi. Other current works on the nonplanar indoor antenna with different techniques and shapes were reported by [53][54][55][56]. Quadrilateral dipole patches (kite-shaped patches) and bowtie-shaped feedline were used by [15], as shown in Figure 6, to realise a wide IBW.…”

“…However, the proposed antenna offers an IBW of 62.6% and ARBW of 37% with an antenna gain of 6 dBi. Other current works on the nonplanar indoor antenna with different techniques and shapes were reported by [53][54][55][56]. Conventional indoor antennas (waveguide, nonplanar or multilayer planar antennas) exhibit a wide or broad IBW, narrow ARBW, high gain and omnidirectional radiation pattern.…”

“…However, the proposed antenna offers an IBW of 62.6% and ARBW of 37% with an antenna gain of 6 dBi. Other current works on the nonplanar indoor antenna with different techniques and shapes were reported by [ 53 , 54 , 55 , 56 ].…”