CALIBRATION OF DIELECTRIC MATERIALS (e.g., LIQUIDS, GELS) 

4 MHz ... 20 GHz

1.9% ... 6.4%

Static Conductivity
<0.1 S/m

4 MHz ... 67 GHz

3.1% ... 6.8%

Static Conductivity
0.1-10 S/m

300 MHz... 20 GHz

4.4% ... 7.5%

4 MHz ... 67 GHz

3.4% ... 4.9%

SPEAG has been accredited by the Swiss Accreditation Service METAS according to ISO 17025 to conduct traceable calibration of dielectric materials like tissue simulating liquids and gels. Procedure is based on using calibrated DAK probe.

Homogeneous and isotropic liquid or semi-solid (e.g., gel) materials can be characterized and calibrated. The amount of material shall be sufficient for the probe flange size, frequency range and losses (reflections from the sample boundaries). For large probe (DAK-12), frequencies < 300 MHz and low loss liquids, typically 1 liter is needed, while 1 dl is sufficient for lossy materials at f > 300 MHz.

Examples for materials to be calibrated: Head and body tissue simulating liquids and gels for SAR and OTA evaluation in the 4 MHz – 67 GHz frequency range. High and low conductivity tissue simulating liquids for MRI safety related tests at 64 and 128 MHz.