Abstract
Effects of multilayered structures on the microwave dielectric properties of composites of polytetrafluoroethylene (PTFE) with ceramic fillers of MgTa2O6 and MgMoO4 were investigated as a function of ceramic content. Dielectric constants (K), dielectric losses (tanδ), and temperature coefficients of resonant frequency (TCF) of the 0–3 type composites were found to depend on the type and amount of ceramic material. Multilayered 2–2 type composites with 0.2 ceramic volume fraction (Vf) showed strong dependence of tanδ on multilayer structures. This was due to strain differences between different layers in the multilayered 2–2 type composites. Several theoretical models were employed to predict the effective K of the composites and were compared with experimental data. Typical results of K=3.53, tanδ=1.75×10−3, and TCF=‐3.49ppm/°C were obtained for a double-interfaced (middle MgTa2O6) 2–2 type composite with 0.2Vf of ceramic.
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