A modification to Gustavsen and Semlyen’s vector fitting algorithm

I’ve done some recent work on system characterisation, with possible application to Radar Absorbent Materials (RAM). This involves locating the poles and zeros of the input impedance function using a vector fitting algorithm. See report Zed_estimators

One novel modification, my “null-space” variant, works very well in the representation of infinite order rational functions by models of finite order.