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CaWO_4-Mg_2SiO_4陶瓷的微波介电性能与应用
引用本文:曹良足,张伟伟,袁开庭.CaWO_4-Mg_2SiO_4陶瓷的微波介电性能与应用[J].电子元件与材料,2009,28(6).
作者姓名:曹良足  张伟伟  袁开庭
作者单位:景德镇陶瓷学院,机电学院,江西,景德镇,333001
基金项目:江西省教育厅科研项目 
摘    要:为了使微波介电陶瓷在厘米波段获得应用,采用固相法制备了低εr、高Q·f值的(1–x)CaWO4-xMg2SiO4(x=0~1.0)介电陶瓷,并添加质量分数为5%的TiO2调节其τf。研究了其晶相结构和微波介电性能。结果表明,x≤0.2时,Mg2SiO4和CaWO4形成不完全固溶体;x=0.2时,在1300℃烧结2h所制得的陶瓷具有优良的微波介电性能:εr=9.58,Q·f=56400GHz,τf=–8.2×10–6/℃,并采用该材料制作了f0=5.4909GHz,插入损耗小于1.1dB,外形尺寸为5.0mm×2.5mm×4.0mm的两级片式介质带通滤波器。

关 键 词:无机非金属材料  微波介电陶瓷  钨酸钙  硅酸镁  带通滤波器

Microwave dielectric properties and application of CaWO_4-Mg_2SiO_4 ceramics
CAO Liangzu,ZHANG Weiwei,YUAN Kaiting.Microwave dielectric properties and application of CaWO_4-Mg_2SiO_4 ceramics[J].Electronic Components & Materials,2009,28(6).
Authors:CAO Liangzu  ZHANG Weiwei  YUAN Kaiting
Affiliation:College of Electronic and Mechanical Engineering;Jingdezhen Ceramics Institute;Jingdezhen 333001;Jiangxi Province;China
Abstract:In order to make microwave dielectric ceramics applicable in centimeter wave band,dielectric ceramics,(1–x)CaWO4-xMg2SiO4(x = 0~1.0),with low εr and high Q·f were prepared via traditional solid state reaction,and 5%(mass fraction) of TiO2 was also introduced to adjust the τf of ceramics.The crystal phase structure and the microwave dielectric properties of prepared ceramics were investigated.The results show that,when x≤0.2,incomplete solid solution is formed after sintering the mixture of Mg2SiO4,CaWO4 and TiO2.However,when x = 0.2,the ceramic sintered at 1 300 ℃ for 2 h exhibits excellent microwave dielectric properties,in which εr = 9.58,Q·f = 56 400 GHz and τf = –8.2×10–6 / ℃,and two-stage laminated dielectric band pass filter was fabricated using this ceramic.The center frequency,insertion loss and size of the fabricated filter is 5.490 9 GHz,below 1.1 dB and 5.0 mm×2.5 mm×4.0 mm respectively.
Keywords:non-metallic inorganic material  microwave dielectric ceramic  calcium tungstate  mgnesium silicate  band pass filter  
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