DESIGN AND OPTIMIZATION OF MULTILAYERED ELECTROMAGNETIC SHIELD USING A REAL-CODED GENETIC ALGORITHM

We report optimized design of multilayered electromag- netic shield using real coded genetic algorithm. It is observed that the shielding efiectiveness in multilayer design is higher than single layered counterpart of equal thickness. An efiort has been made to develop an alternative approach to achieve speciflc objective of identifying the design characteristics of each layer in the multilayered shielding con- flguration. The proposed approach incorporates interrelated factors, such as absorption and re∞ection in the design optimization as per speciflc shielding requirements. The design problem has been solved using shielding efiectiveness theory based on transmission line (TL) modeling and real-coded genetic algorithm (GA) with simulated bi- nary crossover (SBX) and parameter-based mutation. The advantage of real-coded GA lies in e-cient solution for electromagnetic interfer- ence (EMI) shielding design due to its strength in solving constraint optimization problems of continuous variables with many parameters without any gradient information. Additionally, the role of material parameters, such as permittivity and permeability on re∞ection char- acteristics and shielding efiectiveness, has also been investigated and optimized using the proposed models and real-coded GA. Theoretical optimization of electromagnetic parameters has been carried out for SE » 40dB for many industrial/commercial applications and SE » 80dB for military applications.