Materials Measurement Phil Bartley Shelley Begley

Parallel Plate SummaryFrequency Range: 40 Hz – 1 GHz (high end limited by fixtures)Instrument: Impedance AnalyzerAccuracy: typically ±1% for ε r’ and 5% ± 0.005 for tanδRelatively simplecomputation of ε rfromCapacitance andDimensions, or automated inanalzyer.Low frequency only.Works well for thin sheets,PC boards and films..The parallel plate technique works best for thin sheet materials that caneasily be sandwiched between the plates of a capacitor. Accuracy andlow loss resolution is very good, but it is generally limited to lowfrequencies.31