同轴介质滤波器的设计及轧膜制备技术研究

发布时间：2018-05-10 15:33

本文选题：同轴介质滤波器 + 微波介质陶瓷　；参考：《华中科技大学》2015年硕士论文

【摘要】：当今世界,无线通讯技术飞速发展,对滤波器性能的要求越来越高。而移动便携式终端微型化的发展,也对微波器件尺寸和质量提出了要求。因而,具有高Q值、低插入损耗、小体积、高温度稳定性的微波介质滤波器是一个重要的研究课题。本文首先利用网络综合法设计滤波器理论,通过仿真软件设计出中心频率f0=2618MHz、3d B带宽BW3dB=44.9MHz、插入损耗IL1d B的3阶带通滤波器和中心频率f0=2632MHz、3dB带BW3dB=69.9MHz、插入损耗IL1.5dB的4阶带通滤波器。接着,对(Mg0.95Ca0.05)0.9Zn0.1TiO3陶瓷进行了低温烧结的研究。将掺杂不同质量分数ZnO-B2O3玻璃的(Mg0.95Ca0.05)0.9Zn0.1TiO3陶瓷在不同温度下烧结,讨论了ZnO-B2O3玻璃掺杂量和烧结温度对(Mg0.95Ca0.05)0.9Zn0.1TiO3陶瓷微观结构和微波介电性能的影响,实现了(Mg0.95Ca0.05)0.9Zn0.1TiO3陶瓷的低温烧结。当ZnO-B2O3玻璃掺杂量为5 wt%时,(Mg0.95Ca0.05)0.9Zn0.1TiO3陶瓷在1075°C烧结获得最佳微波介电性能:εr=19.5,Q×f=62100 GHz,τf=-13 ppm/°C。最后,针对同轴介质滤波器传统成型工艺的优缺点,本文提出了将轧膜成型用于滤波器的制备。实验过程中,选用具有优异介电性能的(Mg0.95Ca0.05)0.9Zn0.1TiO3陶瓷材料,经过轧膜法制备陶瓷膜片,陶瓷膜片叠层热压,切割打孔,排胶烧结,镀银和电极制作这些流程最终获得滤波器样品。
[Abstract]:Nowadays, with the rapid development of wireless communication technology, the performance of filters is becoming more and more important. The miniaturization of mobile portable terminals also requires the size and quality of microwave devices. Therefore, microwave dielectric filter with high Q value, low insertion loss, small volume and high temperature stability is an important research topic. In this paper, the filter theory of network synthesis method is used to design the filter, and the center frequency f _ (0) 2618 MHz ~ 3dB bandwidth BW _ 3dB _ (B) bandpass filter, the third-order bandpass filter with insertion loss IL1d B and the center frequency f _ (0) 2632 MHz ~ (3 dB) BW _ 3dBB _ (69.9MHz) are designed by simulation software, and the 4th order bandpass filter with insertion loss IL1.5dB is designed. Then, the low temperature sintering of Mg0.95Ca0.05O0.9Zn0.1TiO3 ceramics was studied. Mg0.95Ca0.05- 0.9Zn0.1TiO3 ceramics doped with different mass fraction of ZnO-B2O3 glass were sintered at different temperatures. The effects of doping amount of ZnO-B2O3 glass and sintering temperature on the microstructure and microwave dielectric properties of Mg0.95Ca0.050.90Zn0.1TiO3 ceramics were discussed. The low temperature sintering of Mg0.95Ca0.05Zn0.1TiO3 ceramics was realized. When the doping amount of ZnO-B2O3 glass is 5 wt%, the optimum microwave dielectric properties of Mg0.95Ca0.050.90.905TiO3 ceramics sintered at 1075 掳C are 蔚 rn 19.5 Q 脳 FU 62100 GHz, 蟿 fn-13 ppm/ 掳C. Finally, in view of the advantages and disadvantages of the traditional forming process of coaxial dielectric filter, this paper puts forward the application of rolling film forming to the preparation of filter. In the process of the experiment, the ceramic material of Mg0.95Ca0.05n0.9Zn0.1TiO3 with excellent dielectric properties was selected, and the ceramic diaphragm was prepared by rolling film method. The ceramic membrane was prepared by hot pressing, cutting and drilling, gelling and sintering. Finally, the filter samples were obtained by silver plating and electrode fabrication.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713

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