Optimum Design Of Electromagnetic Band Gap Structure

Electromagnetic band gaps are periodic dielectric and metallic structures in which the refractive index modulation gives rise to stop bands for electromagnetic (EM) waves within a certain frequency range in all directions. In recent years, electromagnetic band gap (EBG) materials have attracted much attention, and many possible applications of such materials were proposed and demonstrated. Research on electromagnetic band gaps, and devices based on them, is exciting and fast-moving. Practical devices are likely to emerge during the next few years. So, electromagnetic band gap received more and more attentions, but it has more difficulty than common microwave devices in engineering design. This inevitably create a problem: how to ensure the precision and reduce the design cost.Basic principles of finite-difference time-domain method, artificial neural network model and genetic algorithm were introduced in this paper, and computer programs were developed. Three methods have been combined to solve the engineering problem of electromagnetic band gap. This approach was validated by the results obtained by commercial package, Ansoft HFSS.Effective approach of engineering optimum design of electromagnetic band gap, and useful practices of reducing the design cost were provided.