Rational Fitting with Weighted Iteration (RFWI) with Application to Chassis Antenna

Rational Fitting with Weighted Iteration (RFWI), a novel approach to high frequency circuit analysis is presented in this paper. It has a capability to extract an analytical rational function from the system response in frequency domain as a surrogate function and then easily build the equivalent circuit as a surrogate circuit. Its flexible weighting factor allows the key region of the response to be emphasised. This reliable and efficient approach is demonstrated by an application in a chassis antenna with two resonators. The RFWI technique is a key feature to find a surrogate model, which could be combined with artificial intelligence algorithms to realize the automated design in the future.