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.
出处
《中国陶瓷》
CAS
CSCD
北大核心
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)
关键词
低介电常数
微波介质
钨酸钙
硅酸镁
low dielectric constant, microwave dielectric, Calcium tungstate, Mgnesium silicate
