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A Modification of Gustavsen and Semlyen’s vector fitting algorithm for overestimated model order

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posted on 06.12.2021, 20:00 authored by Andrew MackayAndrew Mackay
Gustavsen and Semlyen’s vector fitting algorithm (VFA) is popular for the determination of the poles and residues of a sampled response function, modeled as a finite order rational function. However, it does not always perform well when the original function is of infinite order and/or the model order is overestimated. This article is concerned with a novel “null-space” modification of the VFA that provides an accurate representation of the original function when the model order is large and when the original VFA performs poorly. The null-space method is parameterized by a single control parameter, L, which can be adjusted to improve accuracy. Comparisons are made with the original VFA and another of Gustavsen’s modifications

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andrew@ueltd.co.uk

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Universal Electromagnetics Ltd

Submitting Author's Country

United Kingdom

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