Analysis and Design of Microwave Absorbers Combining Surface Wave Attenuation and Reflection Bandwidth Properties

A new method is outlined in this manuscript to design an optimized microwave absorber (MA) achieving the desired level of reflection bandwidth (RBW) and surface wave attenuation (SWA). The proposed semianalytical two-dimensional dynamic method is best suited for the type of MAs consisting of either single-layer or multilayer impedance surfaces, such as resistive sheets and meta-materials. The proposed work contains the following two aims: 1) computation of the SWA in meta-material-based absorbers and 2) optimization of MA parameters for obtaining the desired level of SWA and RBW. To achieve the first aim, a complete mathematical explanation is outlined in detail, and further, to validate it, a particular example is implemented through which it is possible to simulate and analyze the structure via full-wave simulations. This proposed methodology is further integrated with the multiobjective optimization process of a genetic algorithm to achieve the second aim. Consequently, optimization of MA parameters is carried out and the desired level of outputs (i.e., RBW and SWA) is achieved. The proposed approach is explained by means of various examples of MAs and after detailed analysis, some competitive solutions are achieved. The proposed work can be widely applied in microwave frequency-based electronic devices to avoid surface electromagnetic wave coupling.