Building a surrogate model of a perfect electric conductor using polynomial chaos expansion and the characteristic mode analysis

Authors: ADEM YILMAZ, HULUSİ AÇIKGÖZ, Alaaldeen Barakat Ahmed ELROUBY

Abstract: A surrogate model for a perfect electric conductor plate is built by using the polynomial chaos expansion method. The plate is excited via four capacitive coupling elements for which the locations are determined by the analysis of the current distribution for each mode provided by the characteristic mode analysis. A numerical model based on the method of moments is then created to generate a database needed to build the surrogate model. Radiation patterns calculated by the surrogate model are compared with those given by the numerical model. The results show that the surrogate model can mimic the numerical model and it can be used to replace complex numerical models to save computation time and to alleviate the burden on the computation resources. Then, a sensitivity analysis is conducted to exhibit the effect of the parameter deviations on the overall antenna performance and to reveal the influential input parameters. The results of sensitivity analysis are used to reduce the complexity of the overall structure.

Keywords: Characteristic mode analysis, polynomial chaos expansion, sensitivity analysis, surrogate model

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