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Development of low-K and mid-K co-fired LTCC materials for millimeter-wave applications

Update time:2021-02-05
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SEMINAR 

CAS Key Lab of Inorganic Functional Materials and Devices

中国科学院无机功能材料与器件重点实验室 

 

Development of low-K and mid-K co-fired LTCC materials for millimeter-wave applications 

 

Kuei-Chih Feng(冯奎智)博士 

Ming Chi University of Technology(明志科技大学) 

      

时间:20191015日(星期二)下午14: 00

地点: 嘉定园区F72)会议室

    

欢迎广大科研人员和研究生参加! 

联系人:刘志甫(69906595 

    

  Abstract 

  The low-K and mid-K co-fired microwave dielectric materials for low temperature co-fired ceramics (LTCC) were investigated.  The mid-K material is Ba5Nb4O15 ceramic added with <10% glass (BN-40). The low-K materials include BaWO4 ceramic added with <10% glass (BW-10), CaMgSi2O6 glass-ceramics (CMS-7), and CaO-Al2O3-B2O3-SiO2 glass added with Al2O3 ceramic-filler (CABS-7). BN-40 and BW-10 contain less than 3% silicate oxide addition, and CMS-7 and CABS-7 contain high concentrations of silicate oxide up to above 50%.  In order to develop the heterogeneous co-firing of low-K and mid-K materials, four materials were prepared by tape casting and then low/mid-K materials co-fired at 900oC for 30 mins with Ag electrode.  

  The BN-40 co-fired with both CMS-7 and CABS-7 shows high Si diffusion in the heterogeneous boundary. CMS-7 and CABS-7 co-fired with silver inner-electrode also exhibit high silver diffusion in the matrix.  It was suggested that the liquid phase sintering easily induces interaction and silver diffusion due to the high silicate concentration. Moreover, the BN-40 co-fired with BW-10 exhibits clearly heterogeneous boundary and no Ag diffusion due to a few silicate existence in the BN-40 and BW-10. BN-40 and BW-10 can be considered as candidates for low-K and mid-K co-fired materials for LTCC development. In order to inhibit silver diffusion, 0-2.0 wt% SiO2 added CMS-7 glass-ceramics co-fired with silver electrode were studied. SiO2-added CaMgSi2O6 exhibits a reduction of inter-diffusion and Ag-O phase in the diffusive layer, indicating that SiO2 addition in the CaMgSi2O6 can inhibit inter-diffusions. 2 wt% SiO2-added in CMS-7 glass-ceramics were prepared to fabric the patch antenna. The patch antenna exhibits a return loss of S11 = -23 dB at frequency = 28GHz, which is better than ~S11 = -18 dB in specimens without SiO2 addition.     

    

  冯奎智博士简历: 

  冯奎智,博士,明志科技大学(Ming Chi University of Technology)机械系助理教授。19992003年就读于台北科技大学材料暨资源工程系,2003-2006年就读于台湾大学地质研究所,2009-2013年就读台湾科技大学机械所材料组。2013-2016年期间,工作于PSA集团(华新科技集团)的信昌电子陶瓷粉末公司,进行LTCC材料开发与生产,并负责吨级产能的LTCC材料量产线架设与品保导入管制。2016-迄今,任职于明志科技大学 (台塑集团),主持玻璃与陶瓷实验室。主要研究方向包括电子陶瓷材料  (LTCC & NPO)、电子级玻璃材料与生医玻璃材料等。    

 
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