A novel dual-layer non-uniform metasurface utilizing FR4 substrate is presented,which enables a low-cost,low-profile,and miniaturized broadband metasurface antenna(MTA).Distinct from conventional metasurface designs,the proposed metasurface is composed of closely arranged periodic patches with different di-mensions.Moreover,the upper-layer patches overlay the gaps between adjacent units of the lower layer.Conse-quently,the resonance of the metasurface antenna is shifted to lower frequencies due to the combination of cross-layer and edge capacitance.By employing aperture coupling,a miniaturized metasurface antenna utilizing the dual-layer nonuniform metasurface is proposed,which exhibits two resonant modes:aperture mode and metasurface mode.By optimizing the metasurface parameters,the impedance matching can be adjusted to achieve a wide fre-quency band.Both simulation and measurement results demonstrate that the proposed MTA achieves an imped-ance bandwidth of 59.46%within a radiation aperture of 0.38λ0×0.48λ0,while maintaining a profile of 0.08λ0.Ad-ditionally,the use of FR4 substrate effectively reduces the cost of the antenna in applications of wireless commu-nication systems.
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