dielectric permittivity and permeability measurement system
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Dielectric Permittivity and Permeability
Measurement System
Nikolay S. Knyazev, PhD in Technical Sciences
Alexander I. Malkin
Ural Federal University
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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
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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
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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 .
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Softwareuser interface
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Softwareequipment remote control
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Softwareequipment remote control
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Measurement results
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Air
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PTFE
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Air gap influenceF, ГГц ε’ ε"
Before correction9
1.923 0.41
After correction 2.063 0.45