Materials Measurement Phil Bartley Shelley Begley

Transmission Line Technique SummaryFrequency Range: Broadband or Banded 1 to 75GHzInstrument: Network AnalyzerAccuracy: typically ±2-5% for ε r’ and ± 10 -2 for tanδBest for hard machineablesolidsPrecise sample shape required(usually destructive)Widely available coax orwaveguide fixtures.Needs large samples for lowfrequencies; small samples forhigh frequencies.Works for magnetic materialsLiquids, powders and gasesmust be containedThe transmission line technique offers good broadband or banded frequencycoverage. Accuracy and loss tangent performance are good. It is best forhard solids that can be machined precisely to fit inside sample holders.Sample sizes scale with frequency and be difficult to handle at the extremelow and high frequencies.50