Table 2.
Material measurement techniques.
| Illustration | Material Under Test | Frequency | Other Comments | |
|---|---|---|---|---|
| Coaxial Probe |  |
Lossy Material (liquids and semi-solids) | Broadband | Non-destructive |
| Transmission Line |  |
Lossy to low loss material (machineable solids) | Broadband | |
| Free Space |  |
Best for flat sheets, powder high temperature | Broadband | |
| Resonant Cavity |  |
Low loss materials, small samples | Single Frequency | Accurate |
| Parallel Plate |  |
Flat sheets | Low Frequencies | Thin |
| Inductance measurement |  |
Toroidal structures required | Accurate, simple measurement |