A Robust Hybrid Taguchi-Gradient Optimization Method for the Calculation of Analytical Green’s Functions of Microstrip Structures

A new hybrid technique is presented to find two-dimensional complex images of Green's functions of microstrip structures. This technique combines the Taguchi algorithm with the BFGS gradient-based method. The analytical Green's functions are valid over a wide range of frequencies and regions. The superiority of the technique is shown by comparing its results with the rigorous numerical integration of Sommerfeld integrals.