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Cavity losses modeling using lossless FDTD method

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5 Author(s)
Orjubin, G. ; laboratoire ESYCOM, Univ. de Marne la Vallee, France ; Petit, F. ; Richalot, E. ; Mengue, S.
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The impulse response of a lossless resonant system, usually obtained using the finite-difference time-domain method, permits us to determine the resonant frequencies through the Fourier transform. However, the obtained spectrum has no physical meaning since the losses have not been implemented. Rather than modeling physically the losses, we propose to apply a specific time-domain window to the already simulated signal of the lossless system. This Losses window depends on a user-defined quality factor. The advantage of this postsimulation losses implementation is a capability of parametric study of composite losses. Losses of various physical origins are found for example in the case of reverberation chambers.

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Electromagnetic Compatibility, IEEE Transactions on  (Volume:48 ,  Issue: 2 )