| Summary: | 碩士 === 國立聯合大學 === 電機工程學系碩士班 === 100 === This thesis shows the preparation of the microwave dielectric materials, and the design of compact microstrip antenna wth different substrates.Firstly, the (Ca(0.4-x)A(x))Sm0.4TiO3(A = Mg2+ or Sr2+) and Ca0.4Sm0.4(Ti(1-x)B(x))O3(B = Zr4+) ceramics were prepared by using conventional solid-state methods and were characterized . It is interesting to study the influence of dielectric properties on the different substitutions in the A-sites or B-sites in the material system.On the other hand, due to compensated the near–zero τf value, CaTiO3, having a larger positive τf, was selected as a compensator and add to ZnAl2O4 to form a near-zero τf ceramic system (1-x)ZnAl2O4-(x)CaTiO3. The experimental results show that the excellent microwave dielectric properties (εr~10.69，Q×fvalue ~32000 GHz，τf~0 ) can be obtained for 0.92ZnAl2O4-0.08CaTiO3 sintered at 1400℃ for 4 h.Finally, a microstrip antenna has been designed and fabricated with different substrates such as 0.92ZnAl2O4-0.08CaTiO3 ceramic substrate and FR4 substrate.
Key words: Microwave ceramic material, microstrip antenna
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