摘要
利用集总参数等效电路模型计算了声表面波双模耦合谐振滤波器的频响．通过改变谐振器各个参量使滤波器指标满足要求．在ＳＴ石英基片上成功研制出中心频率２２８ＭＨｚ，△ｆ－３ｄＢ＝１５０ｋＨｚ，插损为３ｄＢ，阻带抑制小于－５０ｄＢ的铁路专用寻呼机用滤波器。理论计算与实验结果一致。
in this paper,the frequency response of SAW filter with double-mode resonator iscalculated from lumped equivalent circuit model.The required specification of the filter is obtainedthrough changing each parameter of the resonator. The SAW filter for special pager used on railway is designed successfully on ST-quartz substrate. The characteristics of the filter include centerfrequency of 228 MHz,3 dB bandwidth of 150 MHz,insertion loss of less than 3 dB and the outband rejection of- 50 dB. The experimental results are in agreement with theoretical values.
出处
《压电与声光》
CAS
CSCD
北大核心
1996年第1期6-9,共4页
Piezoelectrics & Acoustooptics
基金
四川省科学基金
关键词
双模
谐振滤波器
低插入损耗
声表面波器件
设计
double-mode resonator filter
equivalent circuit model
low insertion loss
pager
