A trust region aggressive space mapping algorithm for EM optimization

A robust new algorithm for electromagnetic (Eh) optimization of microwave c ircuits is presented. The algorithm (TRASM) integrates a trust region metho dology with the aggressive space mapping (ASR I). The trust region ensures that each iteration results in improved alignment between the coarse and fi ne models needed to execute ASM. The parameter extraction step is a crucial part of the AS1\1 technique. The nonuniqueness of this step may result in the divergence of the technique. To improve the uniqueness of the extractio n phase, we developed a recursive multipoint parameter extraction. This sug gested step exploits all the available Ehl simulations for improving the un iqueness of parameter extraction, The new algorithm was successfully used t o design a number of microwave circuits, Examples include the Ehl optimizat ion of a double-folded stub filter and of a high-temperature superconductin g (HTS) filter using Sonnet's em, The proposed algorithm was also used to d esign two-section, three-section, and seven-section waveguide transformers exploiting Maxwell Eminence. The design of a three-section waveguide transf ormer with rounded corners was carried out using HP HFSS, We show how the m apping can be used to carry out Monte Carlo analysis using only coarse mode l simulations.