Abstract
A compact wideband three-port metasurface (MTS) antenna is proposed by exciting three characteristic modes (CMs) of a MTS resonator. Characteristic mode analysis (CMA) is used for guiding the port placement with high isolation. With a planar size of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$34.3 \times 34.3\ \text{mm}^{2}$</tex> for the MTS, the proposed antenna achieves a measured bandwidth of 20.4%, 27.7% and 31.4% for each port, all with a least return loss and port isolation of 10 dB and 27 dB, respectively. Compared with existing multi-port MTS antennas, the proposed multi-port MTS antennas achieves the highest port densities without sacrificing port isolation, paving the way for designing extremely high-density m-MIMO antennas for the next generation of wireless networks.
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