A robust method for the computation of new closed-form Green's functions for microstrip structures
A robust approach for the computation of new closed-form Green's functions is considered to calculate the symmetrical microstrip Green's functions. In this method, the surface-wave poles are first extracted using a recursive contour integration method. Then, the remainder is approximated by a series of complex exponentials using the Prony's method or the generalized pencil-of-function method (GPOF) along the extended rooftop shaped path in k?-plane. Subsequently, an analytical identity is employed to obtain the new spatial-domain Green's functions. It is observed that this method can evaluate the spatial-domain Green's functions accurately and efficiently for both near and far fields. In addition, there is no erroneous results in the near-field region when z ? z? and ? 0.  2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2011.
closed-form green's functions microstrip complex images