| The problem of electromagnetic scattering from target withelectrically large size cavity has being the focus for long time for strongengineering application requirement. And these existent methods can notmeet the requirement under nowadays computational condition. So, theelectric field integral equation (EFIE) and partial coupling principle hasbeen used in this paper to get the equivalent magnetic current on aperturesurface. Then, generalized combined field integral equation (GCFIE) hasbeen used to solve 3-D vector scattering from target with electric largesize cavity. Certain techniques also have been adopted to reduce thecomputational complexity and time. Moreover, higher order method isused to save memory.Firstly, some methods, such as finite element method (FEM),connecting scheme (CS) etc., for analyzing scattering from target withcavity are reviewed in the present paper after the background, themeaning and the main contribution of the research work. The drawbacksand handicaps of these methods in application are also given.Subsequently, a new method is introduced, i.e. using EFIE with partialcoupling principle to get the equivalent magnetic current on aperturesurface of the cavity.Secondly, the new method-EFIE with partial coupling principle andGCFIE are deduced in detail. The comparison between the new methodand CS gives the ample reasons to support the new method.Thirdly, the key techniques used in this paper are introduced roundly.They are: multilevel fast multipole algorithm (MLFMA), the treatment ofsingularity of integral equations, a series of method for speeding up theiterative convergence. And the application of MLFMA is expanded fromthe condition that the field point and source point are in the samesub-scatterer to that they are in different sub-scatterers.Finally, higher order modeling and higher order basis functions areused to decrease the unknowns further more, and to save the memoryrequirement.In this paper, a lot of numerical results are given. They all proved... |
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