Abstract
In this paper, a low-profile tripolarized antenna with the wideband operation is presented. It includes a monopolar patch element for vertically linear polarization (LP) omnidirectional radiation in the horizontal plane and two orthogonal dipoles for ${x}$ - and ${y}$ -direction LP broadside radiations. In order to achieve the wideband, nevertheless keeping the low-profile, the monopolar patch antenna is coupled with an annular ring, while the two orthogonal dipoles are incorporated with a metasurface. Optimized design with a profile of $0.09\lambda _{\min}$ ( $\lambda _{\min}$ is the free space wavelength referring to the lowest operational frequency) has been fabricated and measured. The measurements result in an overlapped bandwidth of 24.45% (2.19–2.80 GHz) for reflection coefficient < −10 dB and coupling coefficients of < −30 dB among the three ports. In addition, the antenna yields measured peak gains of 8.4 and 9.5 dBi in monopolar mode and two broadside modes, respectively.
Highlights
In order to mitigate the effects of multipath propagation and increase the channel capacity with a total factor of 3, Andrews et al [1] suggested a revolutionary concept of tripolarized antenna, which consists of three orthogonal linear polarization (LP) elements
The monopolar patch with coupled annular ring, metasurface, baluns, and crossed dipoles are realized on FR4 sheets via the printed circuit board technology
All components were collocated on a 24-cm diameter ground plane, which was realized from 0.2-mm copper sheet
Summary
In order to mitigate the effects of multipath propagation and increase the channel capacity with a total factor of 3, Andrews et al [1] suggested a revolutionary concept of tripolarized antenna, which consists of three orthogonal linear polarization (LP) elements. A tripolarization patch antenna with quasi-cross-slot and capacitive coupling feed [17] was achieved an overlapped bandwidth of 13.16% (2.13 – 2.43 GHz) and a profile of 0.075λmin. Ta et al.: Design of a Low-Profile Tripolarized Antenna With Wide Bandwidth less than 0.1λmin, the authors in [19] reported a tripolarized antenna consisting of a monopolar patch for vertically LP omnidirectional radiation and two crossed dipoles for x- and y-direction LP broadside radiations.
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