小型化宽带钽酸锂晶体滤波器  

Development of Miniature Wide-band Filter Using Lithium Tantalate Crystal

作　　者：陈湘渝[1] 周哲[1] 彭胜春[1] 

机构地区：[1]中国电子科技集团公司第26研究所,重庆400060

出　　处：《压电与声光》2011年第3期386-389,共4页Piezoelectrics & Acoustooptics

摘　　要：介绍比较了钽酸锂（LiTaO3,简称LT）晶体和其他几种常用压电体波材料的物理特性,并从电路结构设计、寄生和谐波抑制及温度性能等方面详细介绍了单片钽酸锂晶体滤波器的设计方法并根据该方案设计了一种11.2 MHz单片式晶体滤波器。结果表明,钽酸锂晶体能方便地实现相对带宽0.8%~4.0%、频率温度稳定性好、体积小的宽带晶体滤波器,具有广泛的应用价值。The physical characteristics of LiTaO3（LT） crystal and other commonly used piezoelectric bulk wave materials have been introduced and compared in this paper.The design method of the monolithic LT crystal filter was introduced based on the circuit structure design,the the parasitic and harmonic waves suppression as well as the temperature characteristics.A monolithic LT crystal filter with the centre frequency of 11.2 MHz was designed.The experimental results showed that LT crystal was available for implementing wide-band crystal filters with the relative bandwidth of 0.8%~4.0%,good thermal stabilities and small size,thus had wide applications.

关 键 词：单片晶体滤波器 钽酸锂 小型化 宽带 能陷 机电耦合系数 

分 类 号：TN713.91[电子电信—电路与系统]