Real-coefficient AFS derived for the equivalent circuit modelling of RF passives

In this paper, the Adaptive Frequency Sampling(AFS) technique is modified to macromodel the RF components. The conventional AFS can just express the frequency response as a rational function, but ends up with inefficiency in macromodelling So the proposed scheme here enables the AFS to macromodel the problem by finding the equivalent circuit of the frequency response, since the coefficients of the rational function are made real-valued and easily arranged to the well-known configurations of resistors, capacitors and inductors. The validity of the proposed technique is watched by showing the accuracy of the equivalent circuit compared to the original data and vector fit curve of an RF DGS filter as an instance..