声表面波器件输入及输出负载阻抗匹配研究  

Research on the Input and Output Load Impedance Matching in SAW Device Measurement

作　　者：文常保[1] 姜燕妮[1] 马琼[1] 马跃[1] 靳雪莹 李演明[1] 巨永锋[1] 

机构地区：[1]长安大学电子与控制工程学院微纳电子研究所,西安710064

出　　处：《电子器件》2017年第2期400-404,共5页Chinese Journal of Electron Devices

基　　金：国家自然科学基金项目(60806043);陕西省自然科学基础研究计划项目(2015JM6271);中央高校教育教学改革专项经费项目(jgy16017;jgy16096)

摘　　要：针对声表面波器件测量中网络分析仪的负载阻抗与射频传输线特性阻抗不匹配,导致传输线上反射波幅值较大的问题,提出一种减少传输线上反射波的负载阻抗匹配系统与方案。负载阻抗匹配方案针对声表面波器件测量中输入与输出端分别设计不同的无源负载阻抗匹配网络,使输入输出端都处于匹配状态。负载阻抗匹配系统集成了未匹配通道与匹配通道,根据负载阻抗不同调整匹配参数。对一个中心频率为101.764 MHz,带宽为30 MHz的声表面波器件使用该匹配方案前后中心频率处的衰减进行测量对比,实验结果表明采用该匹配方案后在中心频率点处输入及输出反射损耗分别为-49.36 dB和-38.13 dB,比未采用匹配方案时分别减少了44.99 dB和29.44 dB。In order to reduce the reflection loss of input and output in SAW device measurement due to the mismatching problem between network analyzer load impedance and RF transmission line characteristic impedance,a novel load impedance matching system and scheme are proposed.In this impedance matching scheme,two different passive load impedance networks are designed for input and output port,respectively,which can make both ports to be the matched state to reduce the reflection loss.The load impedance matching system consists of the mismatching channel and matching channel to adjust matching parameters according to the different load impedance value.The reflection loss of a SAW device with the center frequency of 101.764 MHz and 30 MHz bandwidth is measured in the mismatching and matching state.The experimental results illustrate that the reflection loss values of input and output are-49.36 dB and-38.13 dB under matching state,which are 44.99 dB and 29.44 dB less than that of the mismatching state.

关 键 词：声表面波器件 反射损耗 负载阻抗匹配 史密斯阻抗圆图 

分 类 号：TN65[电子电信—电路与系统] TN702