Open AccessDielectric measurement of powdery materials using a coaxial transmission line
Author(s) -
Tempke Robert,
Wildfire Christina,
Shekhawat Dushyant,
Musho Terence
Publication year - 2020
Publication title -
iet science, measurement and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.418
H-Index - 49
eISSN - 1751-8830
pISSN - 1751-8822
DOI - 10.1049/iet-smt.2020.0055
Subject(s) - dielectric , materials science , volume fraction , composite material , coaxial , mixing (physics) , volume (thermodynamics) , matrix (chemical analysis) , transmission line , optoelectronics , thermodynamics , computer science , telecommunications , physics , quantum mechanics
The following study investigates the use of a coaxial transmission line for determining the properties of powdery dielectric materials (1–10 GHz). Four powdery materials with dielectric constants ranging from 3.5 to 70 (SiO 2 , Al 2 O 3 , CeO 2 , and TiO 2 ) were experimentally investigated at varying volume loading fractions. Powder particles were mixed with a paraffin matrix and properties of the powder were analysed using ten mixing equations to verify their accuracy. These powder‐paraffin composites were also modelled at varying volume loadings for comparison with experimental data to gain a better understanding of the interactions between the different phases. The optimal volume loading fraction was determined to be 10% for all powders tested. A metric for selecting the most well‐suited mixing equation was proposed that involved taking the ratio of the particle dielectric to that of the matrix. This study ultimately provides guidance for experimentally measuring the dielectric properties of unknown powdery materials that have applications for new devices that utilised powder‐based dielectric materials.