Middle F shape Split-Ring Resonator Metamaterial Absorber for Wireless Technology

This work covers the characterization and design of a metamaterial-based microwave absorber that is polarization-insensitive, optimized to demonstrate resonant behavior spanning five consecutive frequencies in the Ku-, X-, and C-bands, particularly for wireless technologies. This MMA, with Electric Ring Resonators (ERR) in four-fold and a single-layer coupled symmetry of rotation, is used to get the requisite absorption. The unit cell of this MMA had been made using FR4, a widely available and low-cost substrate material whose dielectric value is 4.3. Five major absorption peaks have been found between 4 and 18 GHz. At frequencies of 4.88 GHz, 6.46 GHz, 7.88 GHz, 11.30 GHz, and 17.22 GHz, microwave absorption levels are 99.3%, 94.9%, 94.5%, 98.7%, and 92.5%. Electromagnetic responses and numerical analysis show polarization insensitivity and wide-angle to co-polar waves. The unit cell’s compact size is a result of its subwavelength dimensions, with an electrical length of 0.16λ×0.16λ×0.03λ at 4.88 GHz, the lowest operational frequency. The proposed MMA absorbs 99% at 4.882 GHz. It also shows steady absorption over horizontal and vertical angles, specifically phi= 0 to 90 degrees and Theta = 0 to 60 degrees, and its refractive index is negative or almost zero. Due to its compact design, strong absorption, wide angular stability, and effective electromagnetic response, this material is highly suitable for wireless communication systems, particularly for satellite applications such as reducing electromagnetic interference, stealth technology, imaging, and radar systems.