Impedance Engineering of TaN-Based Resistive Metasurfaces for the Design of Wideband Absorbers

This article presents the design and comprehensive analysis of a metasurface absorber, focusing on impedance engineering by controlling the shape of the TaN-based resistive surfaces. The proposed absorber features a design composed of square gold patches interconnected with TaN-based resistive surfaces, forming a cross-like unit cell. An analytical equivalent model based on RLC components is developed to provide insights into the impedance characteristics of the proposed absorber. Moreover, a detailed analysis on the impedance characteristics of the absorber is conducted by varying different sizes of the TaN resistive surfaces. Ultimately, this analysis shows that selecting the optimum size of TaN allows for achieving the desired value of the real component of impedance, which enables the design of a wideband absorber.