Metasurface based Polarization-Insensitive Reflection mode Band-reject Filters for 6G Applications

This paper presents a metasurface based reflection mode band-reject filter for future 6G applications. The unit cell of the metasurface is a sub-wavelength modified cross-slot structure with a square patch at the center placed over a Rogers substrate. Numerical simulation shows a narrow band-reject response having a center frequency of 285 GHz with a 3-dB bandwidth of 18.5 GHz. As the metasurface is rotationally symmetric, it also exhibits polarization-independent characteristics. A parametric study is also conducted to provide suitable guidance for designing such metasurface based reflection mode band-reject filters for any Terahertz frequency in the 6G band.