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Minimal symmetric Darlington synthesis

Abstract : We consider the symmetric Darlington synthesis of a p x p rational symmetric Schur function S with the constraint that the extension is of size 2p x 2p. Under the assumption that S is strictly contractive in at least one point of the imaginary axis, we determine the minimal McMillan degree of the extension. In particular, we show that it is generically given by the number of zeros of odd multiplicity of I-SS*. A constructive characterization of all such extensions is provided in terms of a symmetric realization of S and of the outer spectral factor of I-SS*. The authors's motivation for the problem stems from Surface Acoustic Wave filters where physical constraints on the electro-acoustic scattering matrix naturally raise this mathematical issue.
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https://hal.inria.fr/inria-00590547
Contributor : Martine Olivi Connect in order to contact the contributor
Submitted on : Tuesday, May 3, 2011 - 5:25:31 PM
Last modification on : Saturday, June 25, 2022 - 11:05:55 PM
Long-term archiving on: : Thursday, August 4, 2011 - 3:23:21 AM

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Laurent Baratchart, Per Enqvist, Andrea Gombani, Martine Olivi. Minimal symmetric Darlington synthesis. Mathematics of Control, Signals, and Systems, Springer Verlag, 2007, 19, pp.283-311. ⟨10.1007/s00498-007-0020-x⟩. ⟨inria-00590547⟩

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