Microwave absorbers made of arrays of square loops with lumped resistors through optimization with genetic algorithm approach

In this paper, the equivalent circuit model of a microwave absorber is proposed and investigated. The absorber is composed of square metal loops with lumped resistors over the grounded dielectric substrates. The electromagnetic behaviors of these frequency selective surface elements, and the substrate, are studied. A Genetic Algorithm (GA) is employed to optimize the geometrical parameters and the corresponding impedance properties to achieve different design requirements. Finally, two examples are presented and discussed; the results demonstrate the validity and accuracy of the equivalent circuit model.