低介电常数微波介电陶瓷的开发与应用  

DEVELOPMENT AND APPLICATION OF LOW DIELECTRIC CONSTANT MICROWAVE DIELECTRIC CERAMICS

作　　者：曹良足[1] 张伟伟[1] 袁开庭[1] 

机构地区：[1]景德镇陶瓷学院机电学院,景德镇333001

出　　处：《中国陶瓷》2009年第11期24-27,共4页China Ceramics

基　　金：江西省教育厅资助项目(赣教技字[2007]226号)

摘　　要：为了使微波介质材料在微波高端获得应用,本文研究了介电常数小于10、高Q值的(1-x)CaWO4-xMg2SiO4介电陶瓷的结构和微波介电性能。通过X射线衍射分析,该陶瓷具有四方结构。随着x的增加,介电常数(εr)逐渐减少,Q·f值与烧结温度紧密相关,频率温度系数(τf)均为负值。当x=0.1时,εr=9.5,Q·f=60300GHZ,τf=-50ppm/℃。并用该组成的材料制作了中心频率f0=6.0GHz,带宽Δf=197MHz,插损小于1.5dB的两级贴片式介质带通滤波器,该滤波器已用于智能交通系统(ITS)中。In order to use at a high microwave frequency range, the microstructures and the microwave dielectric properties of （1-x）CaWOe-xMg2SiO4 ceramics with εr below 10 were investigated. The ceramics have tetragonal structure using X-ray diffraction. With the composition x added, εr decreases, εr. f value is connected with sintering temperatures, τ f is negative. At the composition of x=0.1, εr,=9.5, whose centre frequency is 6. 0GHz, bandwidth 197MHz,insert loss below 1.5dB, Q·f=60300GHz, τ f =-50ppm/ ℃ The SMT two poles dielectric bandpass filters, have been made of the 0.9CaWQ-0.1Mg2SiO4 ceramics, the filters have been used in Intelligent Transportation System.

关 键 词：低介电常数 微波介质 钨酸钙 硅酸镁 

分 类 号：TQ174.756[化学工程—陶瓷工业]