Electromagnetic Scattering Analysis of Conventional Frequency Selective Surfaces for Terahertz Applications

Conventional designs of arrays of metallo-dielectric frequency selective surface (FSS) for terahertz (THz) frequency range such as square conducting pads (Pixels), metallic mesh, mesh-loop (ML), square loop (SL) and complementary square loop (CSL) are analyzed and compared through simulations. Pixel FSS demonstrates 0.58 THz wide stop-band and 0.14 THz wide pass-band centered at 2.96 THz and 3.35 THz respectively. By complementing, the pixel array becomes a mesh array that appears as a band-pass FSS from 1.89 THz to 3.45 THz. ML array is formed by removing a square ring from the mesh array and provides a 0.32 THz wide pass-band and 0.3 THz stop-band centered at 0.82 THz and 1.15 THz. After eliminating the outer mesh of ML array, SL array yields a 0.32 THz wide band-stop FSS centered at 1.22 THz. Later, the CSL array is formed when SL array is complemented, and the array demonstrates a 0.6 THz wide pass-band at 1.14 THz. The pixel array provides a high signal rejection capability and the widest −10dB stop-band in the frequency range of 2.58-3.16 THz. This analysis and comparison is significant for reduction of EM coupling or interference in THz based integrated circuits.