Abstract
ABSTRACTEffects of ceramics on the microwave dielectric properties of polytetrafluoroethylene (PTFE) composites filled with MgTiO 3 (MTi) and/or MgTa 2 O 6 (MTa) were investigated. The dielectric constant (K), quality factor (Qf), and temperature coefficient of res-onant frequency (TCF) of the composites were dependent on the type and volume fraction (V f ) of the ceramics. For the compos-ites mixed with MTa and MTi, the K and TCF values decreased with increasing MTi content. The Qf values of the compositeswere affected by relative density. The measured K values of the composites were compared with those predicted by several the-oretical models. Good microwave dielectric properties with values of K =3.6, Qf = 7,788 GHz, and TCF = − 0.19 ppm/ o C wereobtained for the composites with 0.1 V f ceramics (mixed 0.025MTa and 0.075MTi).Key words : Microwave dielectric properties, Composites, Polytetrafluoroethylene, Ceramics 1. Introduction ecently, ceramic / polymer composites consisting ofceramic particles in a polymer matrix have beenwidely studied for microwave substrate and electronic pack-aging applications, because they combine the good dielectricproperties of ceramics and the chemical stability, mechani-cal flexibility, and processing possibility of polymers.
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