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Deembedding of filters in multiplexers via rational approximation and interpolation

Abstract : In this paper we present a method to recover electrical parameters of filters embedded in a multiplexer for which scattering measurements are given. Unlike other approaches proposed for this problem, this method does not require a priori knowledge of the scattering parameters of the junction. This feature renders the procedure well suited for tuning purposes or for fault diagnosis. Technically the algorithm starts with a rational approximation step, in order to derive a rational representation of certain scattering parameters of the multiplexer. This representation is then used in a second step to identify the electrical model of each filter. This second step relies on a rational interpolation technique used to extract the filter's responses.
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https://hal.inria.fr/hal-01165529
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Fabien Seyfert, Matteo Oldoni, Martine Olivi, Sanda Lefteriu, D. Pacaud. Deembedding of filters in multiplexers via rational approximation and interpolation. International Journal of RF and Microwave Computer-Aided Engineering, Wiley, 2015, pp.7. ⟨hal-01165529⟩

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