A simple equivalent model and its improvement for field iterative method [EM wave scattering]

The scattering from air inlets/engines significantly affected the overall radar signature of real targets. For this reason, the development of accurate and efficient methods to investigate the electromagnetic scattering from such structures is, therefore, in important task, and has; attracted much attention in the electromagnetics community. One of the well-cited methods for this class of problems is the field iterative method (FIM), first proposed by Reuster and Thiele (IEEE Trans. Antennas Propagat., vol.43, p.286-290, 1995) to compute the scattered electric fields at the aperture of an electrically large perfectly conducting cavity. In order to improve the accuracy of the field iterative method based on the simple equivalent model, an improved field iterative method has been proposed, which can be considered as a relaxation version of the field iterative method. Numerical simulations for scattering from cavities verify the present formulation of the field iterative method, and show that the improved field iterative method is accurate and robust.