| Summary: | 碩士 === 國立成功大學 === 電機工程學系碩博士班 === 95 === The microwave properties of Mg0.95Co0.05TiO3 dielectric ceramic materials are discussed in this paper. By adding different sintering aids ZnO and B2O3 respectively, we study the existence effects of liquid phase for the microwave properties of Mg0.95Co0.05TiO3. The experimental results show that with addition of 0.75wt% ZnO can efficiently reduce sintering temperature from 1350 oC to 1250 oC, and we obtain that the dielectric properties are εr ~22.22， Qxf ~70000 (9GHz) and τf ~ -28.0(ppm/oC). Concerning about the negative value of τf , we choose adding the Ca0.8Sm0.4/3TiO3 (+400(ppm/oC)) to adjust the value approaching to zero. At 1275 oC, 0.9Mg0.95Co0.05TiO3-0.1Ca0.8Sm0.4/3TiO3 appears the best property: εr~22.48, Qxf~108000(9GHz) andτf~ -8(ppm/oC).
Hence, the microwave properties of Mg0.95Co0.05TiO3 dielectric ceramic materials is improved.
In addition, we design and fabricate a Parallel-Coupled Line bandpass filters with designed center frequency of 5.8GHZ on FR4 、Al2O3 、MCT-CST substrate.
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