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Accurate computation of wide-band response of electromagnetic systems utilizing narrow-band information

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5 Author(s)
Kottapalli, K. ; Compact Software, Patterson, NJ, USA ; Sarkar, T.K. ; Hua, Y. ; Miller, E.K.
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Cauchy's technique for interpolating a rational function from samples of frequency responses and/or their derivatives is investigated. This technique can be used to speed up the numerical computations of parameters, including input impedance and RCS of any linear time-invariant electromagnetic system. This technique is utilized to find the far field of a slit conducting cylinder (TM incidence) over a bandwidth utilizing the information about the current and its derivatives at a few sample points. The numerical results are presented are in good agreement with exact computational data. This technique is a true interpolation/extrapolation technique as it provides the same defective result as the original electric field integral equation at a frequency which corresponds to the internal resonance of the closed structure.<>

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:39 ,  Issue: 4 )