A visible-near-infrared transparent miniaturized frequency-selective metasurface with a microwave transmission window

In this work, we propose a meshed miniaturized frequency-selective metasurface (MMFSM), which is insensitive to the incidence microwave angle and has great optical imaging quality by extending the effective length of the aperture within the periodic unit and replacing large metal parts with different metallic meshes. Experimental results indicated that our MMFSM had an average normalized transmittance of 87.2% in the visible-near-infrared band, a passband loss of 1.446 dB, and an oblique incidence stabilization angle of 50 degrees (the passband loss was less than 2.38 dB). These are excellent characteristics required for applications in the optics and communication fields. A meshed miniaturized frequency-selective metasurface is proposed, which has high transparency in the visible-near-infrared band as well as a microwave transmission window with a low passband loss and an insensitive incidence microwave angle.