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In this communication, the computation of the perturbation-based electric field integral equation of the form ${R^{n-1},~n = 0, 1, 2, \ldots ,}$ is accelerated by using fast Fourier transform (FFT) technique. As an effective solution of the low-frequency problem, the perturbation method employs the Taylor expansion of the scalar Green’s function in free space. However, multiple impedance matrices...
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