Relative Permittivity and Loss Tangent Measurement Using the NIST 60 mm Cylindrical Cavity

Published

August 31, 2005

Author(s)

Michael D. Janezic, Jolene D. Splett, Kevin J. Coakley, Raian K. Kaiser, John H. Grosvenor Jr

Abstract

In order to develop a dielectric Standard Reference Material (SRM), a measurement system for measuring the relative permittivity and loss tangent of dielectric materials is presented. To achieve the necessary level of measurement accuracy, we selected the circular-cylindrical cavity method. Expressions for determining the relative permittivity and loss tangent are derived from theoretical models of an empty and sample-loaded circular-cylindrical cavity. We preent a description of the circular-cylindrical cavity's specifications in addition to the detailed measurement procedure we employed. We present a comprehensive uncertainty analysis for both the relative permittivity and loss tangent as well as a measurement assurance plan for ensuring the integrity of the measurment system.

Citation

Special Publication (NIST SP) - 260-159

Report Number

260-159

NIST Pub Series

Special Publication (NIST SP)

Pub Type

NIST Pubs

Download Paper

https://doi.org/10.6028/NIST.SP.260-159

Local Download

Keywords

Circular-Cylindrical cavity, dielectric constant, loss tangent, relative permittivity, resonator.

Citation

Janezic, M. , Splett, J. , Coakley, K. , Kaiser, R. and Grosvenor Jr, J. (2005), Relative Permittivity and Loss Tangent Measurement Using the NIST 60 mm Cylindrical Cavity, Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.SP.260-159, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=31716 (Accessed October 12, 2025)