Measuring the relative permittivity of polyetherimide/(Ba_(0.8)Sr_(0.2))(Ti_(0.9)Zr_(0.1))O_(3) composites from 10 kHz to 12 GHz

摘要

The relative permittivity of polyetherimide-(Ba_(0.8)Sr_(0.2))(Ti_(0.9)Zr_(0.1))O_(3) (PEI-BSTZ) composites is measured from 10 kHz to 1 MHz using plate method. As the content of BSTZ filler is less than 18 vol percent, the experimental values are fitted to the values predicted by Lichtenecker equation. As the content is more than 18 vol percent, the measured relative permittivity of PEI-BSTZ composites is higher than the predicted values. The relative permittivity of PEI-BSTZ composites is measured at 1-12 GHz using "square cavity resonator" method. Measured at gigahertz, the relative permittivity of PEI-BSTZ composites is almost unchanged.