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Abstract
A combined method is presented for wideband analysis of electromagnetic radiation through apertures on a resonant cavity. The aperture has size comparable with the wavelength. An interior and an exterior problem are solved by FDTD and MoM, respectively. The aperture field is expanded on an entire domain basis whose time-dependent coefficients are processed by extrapolation techniques and a one-dimensional discrete Fourier transform. As a consequence of the segmentation, a partial reuse of computed electromagnetic data is possible. The method enables a compression of data to be stored and a reduction of computation time.