Anomalous dispersion in the dielectric spectra of conductive materials

A high-frequency impedance analyzer is used to study the dielectric permittivity of a conductor-filled composite. An anomalous dielectric dispersion is observed at high frequencies. Comparison to dielectric probe measurements indicates that this dispersion is not reproducible with other measurement techniques and may be a result of instrumental artifacts. Theoretical circuit models show that this dispersion is most likely caused by finite inductances and resistances that exist in the electrode fixture.