Study of Microwave Dielectric Properties of Sr4LiM3O12(M=Nb,Ta)Materials and its Applications

• Main Authors: ChangYiPeng, 彭長億
• Other Authors: HSU, CHENG-HSING
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/26765158420117648491

碩士 === 國立聯合大學 === 電機工程學系碩士班 === 103 === In this paper, the preparation and dielectric properties of the microwave materials and the applications on monopole antenna have been studied. In this study, Sr2 + substitution Ba4LiNb3O12 it made Sr4LiNb3O12 to investigate the microstructure and microwave dielectric properties.From the experimental results, Sr4LiNb3O12 have the excellent microwave dielectric properties (εr ~ 38, Q×f ~ 8,500GHz, τf ~ -17) at a sintering temperature of 1390℃ for 4 hours; on the other hand, Because of the same charge and effective ionic radius (0.64 Å) of Nb5+ andTa5+ ions, so the substitution portion formed Sr4Li(Nb1-xTax)3O12(x = 0.1、0.3、0.5) solid solution , And to explore its microstructure and microwave dielectric properties. From the experimental results that x = 0.1 at a sintering temperature 1410℃ for 2 hours, Sr4LiNb2.7Ta0.3O12 have the excellent microwave dielectric properties (εr ~ 32, Q×f ~ 10,000GHz, τf ~ 0). Finally, the best result of the above prepared substrate for monopole antenna design experiments and to explore its properties.