Measurement on high-loss liquids and malleable solid materials in the frequency range 50 MHz to 50 GHz.
Open-ended coaxial probes in various sizes are typically used for measuring tissue-equivalent phantoms used in SAR (Specific Absorption Rate) measurement, foodstuffs, and biomedical materials.
NPL-developed Monte-Carlo modelling software is used for evaluation of uncertainty. Measurement at lower frequencies (down to 50 MHz) on liquids is possible with coaxial cells and a 44 mm coaxial sensor.
Related research reports and publications
NPL Report MAT 13 – Measurements on layered materials, A. P. Gregory, R. N. Clarke, T. E. Hodgetts and G. T. Symm, 2008
NPL Report TQE 9 – Formulation and properties of Liquid Phantoms, 1 MHz to 10 GHz, B. G. Loader, A. P. Gregory and R. Mouthaan, 2018
A. P. Gregory and R. N. Clarke, "Dielectric Coaxial Sensor Metrology”, Meas. Sci. Tech., 2007
P. M. Meaney, A, P. Gregory, J. Seppala; T. Lahtinen, “Open-Ended Coaxial Dielectric Probe Effective Penetration Depth Determination”, IEEE Microw. Theor. Tech., 2016