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http://dx.doi.org/10.4191/kcers.2012.49.3.272

Microwave Dielectric Properties of MgTiO3, MgTa2O6/Polytetrafluoroethylene Composite  

Jeon, Chang-Jun (Department of Materials Engineering, Kyonggi University)
Kim, Eung-Soo (Department of Materials Engineering, Kyonggi University)
Publication Information
Journal of the Korean Ceramic Society / v.49, no.3, 2012 , pp. 272-278 More about this Journal
Abstract
Effects of ceramics on the microwave dielectric properties of polytetrafluoroethylene (PTFE) composites filled with $MgTiO_3$ (MTi) and/or $MgTa_2O_6$ (MTa) were investigated. The dielectric constant ($K$), quality factor ($Qf$), and temperature coefficient of resonant frequency ($TCF$) of the composites were dependent on the type and volume fraction ($V_f$) of the ceramics. For the composites mixed with MTa and MTi, the $K$ and $TCF$ values decreased with increasing MTi content. The $Qf$ values of the composites were affected by relative density. The measured $K$ values of the composites were compared with those predicted by several theoretical models. Good microwave dielectric properties with values of $K$=3.6, $Qf$ = 7,788 GHz, and $TCF$ = -0.19 ppm/$^{\circ}C$ were obtained for the composites with 0.1 $V_f$ ceramics (mixed 0.025MTa and 0.075MTi).
Keywords
Microwave dielectric properties; Composites; Polytetrafluoroethylene; Ceramics;
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