Calculating highly oscillatory EM transients by using rational-function interpolation and FFT

We compare results for EM transients calculated using frequency domain analysis coupled with FFT with and without frequency-domain rational-function interpolation, in order to reduce the total number of frequency samples needed for accurate calculation of transients. To further reduce the total anal...

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Bibliographic Details
Main Authors: Olcan, D. I., Kolundzija, B. M.
Format: Conference Proceeding
Language:English
Subjects:
Apertures
Electric fields
FFT
Interpolation
method of moments
rational-function interpolation
Time frequency analysis
Transient analysis
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Summary:We compare results for EM transients calculated using frequency domain analysis coupled with FFT with and without frequency-domain rational-function interpolation, in order to reduce the total number of frequency samples needed for accurate calculation of transients. To further reduce the total analysis time, we use zero-padding, for all frequencies where excitation spectrum is negligible. The proposed approach is applied to a problem of finding transient EM fields within metallic resonator with high Q-factor. The presented results show that time-domain response can be calculated more efficiently, with preserving the overall accuracy, if the proposed rational-function interpolation in frequency domain is used.
DOI:10.1109/COMCAS.2011.6105864