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Using model-based parameter estimation to increase the efficiency of computing electromagnetic transfer functions

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4 Author(s)
Burke, G.J. ; Lawrence Livermore Nat. Lab., CA, USA ; Miller, E.K. ; Chakrabarti, S. ; Demarest, K.

Two main ideas are introduced: (1) the use of model-based parameter estimation based on rational function approximations, which reduces the number of frequencies at which solutions or samples are required; (2) a sampling approach that uses frequency derivatives of the response and a novel analytical technique based on differentiating the moment method impedance equation, which provides derivative information in a time proportional to N2 in contrast with the N3 dependence in solving the original problem. Antenna input admittances are modeled using frequency samples and derivatives. The rational function model is shown to offer a large advantage over polynomial interpolation of a frequency response. Application of the frequency-derivative approach is demonstrated for problems having well-defined resonances such as a dipole antenna, and for more challenging problems having narrow resonances

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Magnetics, IEEE Transactions on  (Volume:25 ,  Issue: 4 )