Étude d'une méthode de caractérisation diélectrique en domaine temporel, utilisant les propriétés du changement d'admittance entre une ligne coaxiale et une cellule cylindrique

Abstract

Study of a dielectric characterization technique in time domain spectroscopy, by using the admittance change between two propagation media. The aim of this work is the implementation of a device and a protocol for characterization of dielectric materials for cylindrical shapes and non- toroidal as required the use of coaxial cells. It is therefore obvious that we try to use the coaxial - cylindrical transition, as a measurement tool, the cylindrical guide then serving cell sample holder. Under these conditions the waves propagating in the TEM mode in the coaxial line becomes evanescent waves in the cylindrical guide. The problem then reduces to solving the equations to define fields in both structures and continuity at the coaxial interface guide - cylindrical guide in the presence or absence of a sample filling the cylindrical measuring cell.