| Microstrip structures have been widely used, the microstrip antennas and MMIC in wireless mobile communication and phased radar are becoming a active research. The existing numerical modeling for microstrip structures is still complicated, and the computing and design result has some difference from the experiment result , Usually several cycle of adjustment and experiment are needed, we may get the final design result, the rigorous and accurate analysis are even more important for instructing the design of microstrip structures.This paper is centered on applying MPIE to analysis microstrip structures. A set of spectral Green's functions for arbitrary shape metal conductor embedded in multilayer media is given by SDI. We thoroughly study the DCIM for computing spatial Green's functions, and make it clear if the extracting surface wave is needed, and put forward a fixed real image method for simple microstrip structures. We propose a numerical integral algorithm with good applicability for computing spatial Green's functions based on windowed Hankel transform (WHT), the precision of this algorithm is easily controlled, and the efficiency is increased compared with direct integrations. Most of problems are discussed in solving the MPIE for print structures in stratified media with moment method, the key pivot is current basis functions, especially the singularity in using high-order vector triangle basis functions. To avoid computing point by point, the AWE is applied to the MoM solution of microstrip structures in multiplayer media for efficient evaluation of the frequency response over a broadband. The FMM originally developed for free space problems is extended to microstrip problem with the aid of the DCIM, which reduce the number of matrix-vector products in using iterative method for solving MoM equations, and the memory requirement. Some examples of microstrip structures are analyzed to demonstrate the accuracy and feasibility.
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