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A novel approach is presented for efficiently solving electromagnetic (EM) scattering problems using proper orthogonal decomposition (POD). As a proof of concept and demonstration of how to use the POD to solve EM scattering problems, two ways of implementing the POD procedure have been proposed and realized for calculating EM scattering from PEC targets. Numerical results obtained show that the POD is quite accurate for reconstructing backscatter patterns over wide range of frequencies and angles of interest based on the given snapshots. [ABSTRACT FROM AUTHOR]

In this paper, the authors present a new and fast implementation of the field iterative method (FIM) with the fast far-field approximation (FAFFA). The new implementation of FAFFA-FIM can significantly reduce the computational expenses of the FIM. Numerical simulations for scattering from cavities verify the proposed FAFFA-FIM. The memory requirement and CPU time per iteration of the FAFFA-FIM are O(N) and O(N1.5), respectively, and the CPU time per iteration of the FAFFA-FIM can be further reduced to O(N4/3). [ABSTRACT FROM AUTHOR]

In this paper, the authors use the adaptive integral method (AIM) to simulate the electromagnetic scattering from large complex PEC objects. The first problem that we have investigated is the scattering from a dihedral corner reflector that may lead to a better understanding of scattering mechanisms and properties of more complex geometries. The second problem investigated in scattering from a multiplate structure consisting of trapezoidal plates. The third problem investigated is the scattering from a composite PEC sphere and plate structure. The AIM simulation results are compared to the results obtained using the physical optics (PO) technique. In order to test the capability of AIM further, an aircraft model with many patches of flat surfaces has been built for this purpose. This mesh generation and the measurement of the scattering pattern of the aircraft model have been carried out by us. With the mesh and measurement results of the aircraft model, the simulation was carried out using AIM. The numerical results of all the test cases show that the AIM is an efficient method for analyzing electromagnetic scattering from large complex PEC objects. [ABSTRACT FROM AUTHOR]

Examines the electromagnetic scattering from a perfectly electric conducting target located above or below rough surface for the case of TM polarization, using the method of moments. Use of the rough surface with Gaussian profile to emulate the realistic situation of a statistically-rough surface; Use of the tapered incident wave to reduce the truncation error; Calculation of the angular correlational function.

The analysis of electromagnetic scattering from cavity structure is very important to many practical applications. The field iterative method (FIM) is one of the promising methods to deal with the cavity problem. In this paper, 3-dimensional (3D) FIM has been implemented using Rao-Wilton-Glisson (RWG) basis function and an accurate equivalent model of the cavity. Two testing procedures, a newly developed point matching and conventional Galerkin's methods, have been discussed for better and simpler implementation of the 3D FIM. Numerical results show that the accuracy of the 3D implementation of FIM using the newly developed point matching method is the same as that of the conventional Galerkin's method. The numerical results also show that the simpler implementation of 3D FIM using the point matching method converges very fast for all the tested cases. [ABSTRACT FROM AUTHOR]