Accurate modeling of wideband antennas using variable-fidelity simulations, kriging and parameterized response correction

A simple methodology for accurate modeling of wideband antennas is presented. Our approach exploits kriging interpolation of sampled coarse-discretization EM simulation data as an initial surrogate model. A parameterized response correction is subsequently used to improve this initial model with the correction coefficients obtained analytically, based on sparsely sampled high-fidelity EM simulations results of the antenna structure of interest. The resulting surrogate model is very fast, accurate, and, most importantly, it can be constructed at a low computational cost. The last feature makes is suitable for solving design tasks such as performance optimization. Our considerations are illustrated using an example of a broadband slot antenna.