Dielectric Permittivity and Permeability

Measurement System

Nikolay S. Knyazev, PhD in Technical Sciences

Alexander I. Malkin

Ural Federal University

Methods of measurementExist several methods for a permittivity and permeability measurement of a solid materials :

“+” possibilities of measure samples with arbitrary size

“- “ complexity of the system calibration

“+” simple hardware realization

“-” possibility measure only in low frequencies

“+” simple hardware realization

“-” complexity of sample preparation

“+” high accuracy

“-” measure only on predefine frequencies with a low loss sample

Mathematic models Recalculation measured S-parameters into permittivity and permeability values*

Sample MethodМетод

пересчетаСкорость Точность

Thin nonmagnetic losses sample Transmission line NRW Fast Medium

Thick magnetic low loss sample Transmission line NIST Iterative Slow Good

Thick nonmagnetic low loss sample

Transmission lineNew non-itterative

Fast Good

Sample with high temperature Free space NIST Slow Good

Thin nonmagnetic low loss sample

Resonator Slow Excellent

*Kuek, C. Measurement of Dielectric Material Properties: application note/ Kuek Chee Yaw; Rohde-Schwarz 2012

Measurement preparation(transmission line method)

• System calibration. Using TRL technique. Sample holder should be used like line standard.

• Define sample dimensions.One of the main error source is a error of dimensions define of measuring sample.

• Reference plane offset .

Softwareuser interface

Softwareequipment remote control

Softwareequipment remote control

Measurement results

Air

PTFE

Air gap influenceF, ГГц ε’ ε"

Before correction9

1.923 0.41

After correction 2.063 0.45