This study extends the IE-FFT algorithm, which has been developed for surface integral equations to the method of moments solution of nonconformal volume integral equation in electromagnetic scattering problems. The algorithm relies on the interpolation of the Green's function by Lagrangian polynomials on a uniform Cartesian grid in 3-D. Hence the matrix-vector product in the iterative solver can be computed via the fast Fourier transform. The memory requirement and the computational complexity of the algorithm tend to stay close to O(N) andO(NlogN), respectively, where N is the number of unknowns.
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