Thierry Ditchi | Searcharxiv

arXiv2016

Using a 1D bandgap metamaterial to build up a delay line

Classical lumped components delay lines are built with inductances and capacitors arranged as to match the standard telegraphist line model to obtain slow group velocity lines. In this paper we demonstrate that a practical way to obtain significant group velocity reduction consist in taking advantage of the forbidden bands that present a 1D meta-material. The feasibility of this kind of line, as well as its ability to transmit data are discussed and practically verified.

cond-mat.mtrl-sci↗

arXiv2014

Extracting the contribution of conduction in permittivity measurements using the Kramers-Kronig relations

The measurement of the material permittivity is often performed via an impedance measurement. In this case the measured permittivity includes the conduction contribution. Most of the time, the impedance-meters performing such measurement do not perform static measurement even if they can go to low frequencies. When the dipolar relaxation of the material leads to low frequency relaxation, separating the relaxation phenomenon from the conduction phenomenon can be difficult, especially when multiple relaxation phenomena superimpose. In this work we use the Kramers-Kronig relations to perform that separation by considering the frequency response aspect of the permittivity. The practical aspect of the method is presented and demonstrated on real measurements

cond-mat.mtrl-sci↗