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 mode analysis, 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 subcell 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 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 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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Li et al. (2018) studied this question.
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