Methodology for the Development of Broadband Multilayer Microwave Absorbers

In this work, a methodology is proposed to optimize the parameters of the multilayer microwave absorber (MMA), such as thickness and selection of materials to obtain the desired reflection coefficient bandwidth (RCBW). The transmission line method is used to compute the absorption bandwidth. The aim is to obtain the broadband MMA operating in the frequency range from 1 to 20 GHz. Consequently, genetic algorithm (GA) is employed to optimize the parameters of MMA. Moreover, the proposed methodology is implemented by using a database of the lossy magnetic and dielectric which are commercially available materials. For an example, two layers of MMA are optimized and computed the desired RCBW, where the level of RC is varied from -5 to -10 dB.