Dissertation

Design of an Over-Coupled Coaxial Resonator for Determining the Electrical Properties of Materials

Suleman, Muhammed Bashiru

2017

Overview

knowledge so that different materials can be adapted for varying purposes. For example, materials used in engineering design and processes. With unique properties of every material, there is need to determine the properties and characterise materials based on their properties, where their electrical properties is dependent on the dielectric properties of the materials.In this thesis, a method used in determining the electrical properties of materials using the group delay information is investigated. A gap-coupled coaxial resonator that operates in an over-coupled state is designed and used in obtaining the dielectric properties of sample materials.Electromagnetic and circuit simulation tools (HFSS and ADS) are used to better understand and develop the concepts used in this study. Simple lumped elements and distributed elements are used in ADS to model coupled resonators so as to arrive at a set of equations to characterise the coupled resonator when it is empty and filled with a dielectric sample. With HFSS, a model of gap-coupled coaxial resonator is designed and analysed. Where the gap provides the capacitance required for coupling electromagnetic field into the resonator. Different known values of dielectric constant are tested and evaluated using the set of equations obtained. The results from the simulations are used to arrive at certain design parameters for fabricating the resonator. With the physical resonator, Teflon is tested to determine its electrical properties. The results from both the simulation and the fabricated resonator show dielectric constant and loss tangent values obtained to be within the known limits of Teflon.

• Publisher: ProQuest Dissertations & Theses
• Subject: Electrical engineering / Materials science / Mechanical engineering
• ISBN: 9798698584483