Fast microwave design optimisation using shape-preserving response prediction and coarse-discretisation EM models

An efficient technique for fast design optimisation of microwave structures is discussed. The approach is based on the recently introduced shape-preserving response prediction method (SPRP). SPRP allows us to estimate the response of the computationally expensive structure under consideration using the properly selected set of characteristic points of the physically based coarse model response. Here, the coarse model is implemented in the same electromagnetic solver as the one that evaluated the original structure, but coarse discretisation is used. It is demonstrated that the presented technique yields a satisfactory design after two or three evaluations of the original structure. The efficiency of this approach is illustrated through the design optimisation of a double annular ring antenna and two microstrip filters. Comparison with the direct EM-simulation-based optimisation of the fine model is also given.