Deembedding of filters in multiplexers via rational approximation and interpolation

Fabien Seyfert (1) , Matteo Oldoni (2) , Martine Olivi (1) , Sanda Lefteriu (1) , D. Pacaud (3)

1 APICS - Analysis and Problems of Inverse type in Control and Signal processing
2 Dipartimento di Elettronica e Informazione
3 TAS - Thales Alenia Space [Toulouse]

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.

Mots clés: Diplexer; Filter tuning; Fault diagnosis; Deembedding; Rational approximation; Padé interpolation

Domaines: Optimisation et contrôle [math.OC]; Sciences de l'ingénieur [physics]

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, 2015, pp.7. ⟨hal-01165529⟩