| Summary: | 碩士 === 國立成功大學 === 電機工程學系碩博士班 === 96 === The microwave properties of x(Mg0.95Zn0.05)TiO3-(1-x)Na0.5La0.5TiO3 dielectric ceramic materials have been discussed in this paper.Using positive and negative temperature coefficients would achieve zero temperature coefficient of resonant frequency. Na0.8La0.5TiO3 has dielectric properties of ~122，Q × f value ~9800 and a positive value ~ 480 ppm/℃. (Mg0.95Zn0.05)TiO3 possesses high dielectric constant ( ~17)，high quality factor (Q × f ~260,000 at 9GHz) and negative value(-40 ppm/℃).By appropriately adjusting the x value in the x(Mg0.95Zn0.05)TiO3-(1-x)Na0.5La0.5TiO3 ceramic system, zero value can be achieved. The experiment results show that it has excellent dielectric properties(Q×f~103000(9GHz)， ~23.39， ~1.1ppm/oC) when x value equal to 0.88. Besides, we attempt to add different sintering aids B2O3 and CuO respectively and discuss the effects of the microwave properties by various amounts of sintered aids. 0.88(Mg0.95Zn0.05)TiO3-0.12Na0.5La0.5TiO3.
Finally, we design and fabricate a band-pass filter using dual-mode meader loop resonators with 2GHz center frequency on FR4、Al2O3、88MZNLT substrate respectively. And we compared with the result of the simulation and measurement.
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