Design and Analysis of Interconnected Square Ring FSS for C-band Shielding Applications

In this article, an interconnected square Ring FSS is presented. The FSS unit cell consists of an interconnected square ring enclosed by an outer square loop which provides shielding at the C-band frequency range. The symmetric structure of the proposed FSS design offers polarization-insensitive characteristics, ensuring a stable response at normal and oblique incidence for both TE and TM modes. It provides an angular stability of 50° for both TE and TM modes. The FSS unit cell size is $0.136 \lambda_{0} \times 0.136 \lambda_{0}$, where $\lambda_{0}$ denotes the free space wavelength at the lowest resonant frequency.