BNKLT无铅压电陶瓷梯形中频带通滤波器的研制  

Fabrication of Ladder Middle Frequency Passband Filter Using BNKLT Lead-free Piezoelectric Ceramics

作　　者：李灵芝[1] 肖定全[1] 赁敦敏[1] 朱建国[1] 余萍[1] 

机构地区：[1]四川大学材料科学系,四川成都610064

出　　处：《压电与声光》2007年第1期36-37,41,共3页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金重大国际合作基金资助项目(50410179);面上基金资助项目(59972020);国家高技术研究发展计划基金资助项目(2001-AA325060);教育部博士点基金资助项目(20030610035)

摘　　要：利用发明的[Bi0.5(Na1-x-yKxLiy)0.5]TiO3(BNKLT)系无铅压电陶瓷,采用全电极径向振动模式制作了插入损耗小于6 dB,阻带损耗大于30 dB,频率特性曲线平滑,并具有良好选择性的中频(IF=460 kHz)多节带通滤波器。与含铅压电陶瓷多节滤波器相比,BNKLT无铅压电陶瓷滤波器的特性有待进一步改进。BNKLT lead-free piezoelectric ceramics invented were used for making ladder middle frequency passband ceramic filters. Using the full electrode radial vibration mode of the resonance samples, the BNKLT system is fabricated into the multi-section ladder passband filter. The passband filter has good choose character with the curve smooth and the loss insertion no more than 6 dB and the out-band attenuation more than 30 dB. The center frequency is about 460 kHz. Compared with the lead-based multi-section filter, the out-band attenuation of the BNKLT lead-free filter needs to be further improved.

关 键 词：无铅压电陶瓷 BNKLT 全电极径向振动模式 梯形带通滤波器 插入损耗 

分 类 号：TM221[一般工业技术—材料科学与工程] TN713[电气工程—电工理论与新技术]