Terahertz (THz) frequency plays a major role in wireless communication, and it occurs in the region between the UV rays and infrared rays. The split ring resonator (SRR) is synthetically produced, and its structure is similar to that of metamaterials (MMs) that makes the chosen magnetic susceptibility in several kinds of MMs between 200 and 0.1 THz. The existing work involves the challenges of low transmittance, high return, low insertion loss, low bandwidth (BW), and resonant frequency (fr). The planned work includes the design of a notch filter using a square-square-SRR (SS-SRR) with the help of COMSOL Multiphysics software. The proposed filter exhibits a maximum 3 dB bandwidth (BW) of 1.7 THz, low insertion loss (IL) of 0, and minimum return loss (RL) of −54 dB at the resonance frequency of 6.6 THz, and the transmittance is almost 100%. The proposed work finds applications in spectroscopy, wireless communication, high-speed scanning in airports, the detection of cancer, etc.