Metasurface-Based Shared-Aperture 5G ${S}$ -/ ${K}$ -Band Antenna Using Characteristic Mode Analysis

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Abstract
An S/K-band metasurface-based antenna with a shared aperture is proposed for 5G applications. The metasurface is designed with the dual-band characteristics for two antennas to work in the same aperture without interference. Based on the characteristic modes analysis (CMA), 3×3 metasurfaces are proposed for the S-band radiation. To radiate the K-band electromagnetic wave without blocking, the metasurfaces are discretized by the sub-cell of a square ring and an inner square patch to achieve a frequency selective function. Then, as an example, the microstrip-fed slot is used to drive the metasurfaces at the S-band while an 8×8 substrate integrated waveguide (SIW) slot array antenna between microstrip and metasurface is designed at the K-band. The measurement shows the 10-dB return loss bandwidths of 23.45% and 4.8% and the realized gain of 7.52–10.88 dBi and 21.3–22.4 dBi over the S-band (3.2–4.05 GHz) and the K-band (25.22–26.46 GHz), respectively.

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