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 0.09λ min (λ 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. INDEX TERMS Coupled ring, crossed dipole antenna, metasurface, monopolar antenna, tripolarized antenna, wideband.
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