Low-Profile Metasurface-Based Antenna With Tripolarization for 5G Applications.

This article develops a novel low-profile meta-surface-based tripolarized antenna with complementary patterns for fifth-generation (5G) application. A shared aperture metasurface-based structure is first proposed, which is carefully studied by equivalent circuit models and field distribution. Then, to realize multiple polarization operation, the TM10, antiphase TM20, and TM00 modes are used and excited by suitable feeding networks. For horizontal polarization, wideband response is realized by coupling and combining the TM10/TM20 dual modes. An inductance-loaded TM00 mode is displayed by loading the shorting vias on the metasurface, which is used to implement vertical polarization. Finally, a metasurface-based tripolarized antenna with a low profile of $0.04\lambda _{0}$ ($\lambda _{0}$ is the free space wavelength at 3.30 GHz) is fabricated. The overlapped 10-dB bandwidths for all excitations are from 3.26 to 3.84 GHz (16.3%) with isolation greater than 22 dB, which well covers the 5G-N78 band. The measured peak gain and radiation efficiency are larger than 10.3 dBi and −0.42 dB (90.8%), respectively. The results indicate that the proposed antenna with a low profile, a simple and low-cost configuration, multipolarization, good bandwidth, high radiation efficiency, and gain performance could be widely used in sub-6 GHz 5G communication systems. [ABSTRACT FROM AUTHOR]