Highly Efficient, Broadband, and Optically Transparent Reflectarrays Enhanced With Frequency Selective Surfaces and Multiresonance Subwavelength Elements

The rapid advancement of wireless communication technologies requires efficient, optically transparent devices that can support high performance while maintaining optical transparency. This paper presents an optically transparent reflectarray (RA) antenna, enhanced with frequency selective surface (FSS) and multi-resonance subwavelength elements based on fine metal lines (FMLs). FMLs, with a width of 50 μm, are utilized for both the phase shifting surface and FSS layer, contributing to high opti