Analysis of Square Patch-based Electromagnetics Wave Absorber Frequency Response Using Transmission Line Model

An analysis of square patch-based electromagnetics (EM) wave absorber characteristics in term of frequency response is proposed using a model of transmission line. The EM wave absorber modeled in a planar transmission line is arranged using an array of square patches deployed on the top side of dielectric substrate with the groundplane at the bottom side. The array is simulated through a single unit cell of square patch implementing appropriate boundaries surrounding the unit cell to form an EM wave absorber pattern of infinite extent. The performance of simulation is analyzed using transmission line model by deriving the input impedance at the border between the vacuum and the square patch. In order to analyze the correlation between the simulation and the proposed transmission line model, physical parameter of square patch corresponding to admittance component is varied to have similar frequency response. Three different widths of square patch are simulated for the analysis producing the frequency response of 11.95 GHz, 11.05 GHz, 9.95 GHz and 9.00 GHz. The approach of transmission line model shows that the size of square patch can be modeled and analyzed through admittance component affecting the shift of frequency response.