Signal Propagation in Electromagnetic Media Modelled by the Two-Sided Fractional Derivative

Jacek Gulgowski; Dariusz Kwiatkowski; Tomasz Stefański

doi:10.3390/fractalfract5010010

Signal Propagation in Electromagnetic Media Modelled by the Two-Sided Fractional Derivative

Abstrakt

In this paper, wave propagation is considered in a medium described by a fractional-order model, which is formulated with the use of the two-sided fractional derivative of Ortigueira and Machado. Although the relation of the derivative to causality is clearly specified in its definition, there is no obvious relation between causality of the derivative and causality of the transfer function induced by this derivative. Hence, causality of the system is investigated; its output is an electromagnetic signal propagating in media described by the time-domain two-sided fractional derivative. It is demonstrated that, for the derivative order in the range [1,+∞), the transfer function describing attenuated signal propagation is not causal for any value of the asymmetry parameter of the derivative. On the other hand, it is shown that, for derivative orders in the range (0,1), the transfer function is causal if and only if the asymmetry parameter is equal to certain specific values corresponding to the left-sided Grünwald–Letnikov derivative. The results are illustrated by numerical simulations and analyses. Some comments on the Kramers–Krönig relations for logarithm of the transfer function are presented as well.

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Wersja publikacji: Accepted albo Published Version
DOI:: Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.3390/fractalfract5010010
Licencja: otwiera się w nowej karcie

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Informacje szczegółowe

Kategoria:: Publikacja w czasopiśmie
Typ:: artykuły w czasopismach
Opublikowano w:: Fractal and Fractional nr 5, strony 1 - 17,
ISSN:
Język:: angielski
Rok wydania:: 2021
Opis bibliograficzny:: Gulgowski J., Kwiatkowski D., Stefański T.: Signal Propagation in Electromagnetic Media Modelled by the Two-Sided Fractional Derivative// Fractal and Fractional -Vol. 5,iss. 1 (2021), s.10-
DOI:: Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.3390/fractalfract5010010
Weryfikacja:: Politechnika Gdańska