An approach to rapid optimization of antennas using the shape-preserving response-prediction (SPRP) technique and coarsediscretization
electromagnetic (EM) simulations (as a low-fidelity model) is presented. SPRP allows us to estimate the response of the
high-fidelity EM antenna model, e.g., its reflection coefficient versus frequency, using the properly selected set of so-called characteristic
points of the low-fidelity model response. The low-fidelity model, corrected by means of SPRP, is subsequently used to predict the optimal
design. The design process is cost efficient because most operations are performed on the low-fidelity model. Performance of our technique
is demonstrated using a dielectric resonator antenna and two planar wideband antenna examples. In all cases, the optimal design is obtained
at a cost corresponding to a few high-fidelity simulations of the antenna under design.