Dielectric properties are critical design parameters for electronics applications in aerospace, automotive, food and medical industries which need accurate measurements to incorporate the most suitable material into its intended application. Dielectric measurements determine the complex permittivity of materials where the real part of permittivity of a material is the degree to which it can store charge. The loss tangent characterises the dissipation of an electromagnetic wave propagating through the material as a result of dielectric loss mechanisms.
We have comprehensive facilities for measurement of the dielectric permittivity and loss of materials ranging from composites and ceramics to liquids and natural materials, between 1 kHz and 100 GHz. We can determine the most appropriate measurement technique for a particular sample based on the measurement frequency, the loss of the material and the texture. As an NMI, we can ensure traceability and intercompare our techniques.
'A guide to the characterisation of dielectric materials at RF and microwave frequencies' describes the interpretation of dielectric data, measurement techniques and good practice in dielectric metrology. This publication is jointly published by NPL and the Institute of Measurement and Control, please contact us to receive a copy via email.
Our measurement techniques include:
NPL can also:
Examples of recent work include:
We carry out measurements on:
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