access icon free Dielectric measurement of powdery materials using a coaxial transmission line

© The Institution of Engineering and Technology
Received 05/02/2020, Accepted 09/11/2020, Revised 22/09/2020, Published 08/01/2021

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 (SiO2, Al2O3, CeO2, and TiO2) 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.

Inspec keywords: titanium compounds; permittivity; powders; cerium compounds; silicon compounds; aluminium compounds; composite materials

Other keywords: frequency 1.0 GHz to 10.0 GHz; dielectric measurement; powder-paraffin composites; paraffin matrix; coaxial transmission line; volume loading fractions; powder-based dielectric materials; volume loadings; mixing equation; powdery dielectric materials; powder particles; dielectric constants; dielectric properties

Subjects: Dielectric permittivity; Powder techniques, compaction and sintering

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