微流控低通二阶滤波器的特性研究  

Analysis of microflow control low-pass second-order filter

作　　者：孙开文 梁忠诚[1] 赵瑞[1] 孔梅梅[1] 吴雯婷[1] 张曼[1] SUN Kaiwen;LIANG Zhongcheng;ZHAO Rui;KONG Meimei;WU Wenting;ZHANG Man(Microfluidics Optical Research Center, Nanjing University of Posts and Telecommunications, Nanjing 210023, China)

机构地区：[1]南京邮电大学微流控光学研究中心,江苏南京210023

出　　处：《电子元件与材料》2017年第8期80-83,共4页Electronic Components And Materials

基　　金：国家自然科学基金资助项目(No.60878037)

摘　　要：微流控滤波器对于交变流路选频,获得特定频率或稳定的交流流体输出具有重要作用。利用微流控等效电路理论设计了一个π型微流控二阶低通滤波器。该微流控滤波器由三段矩形微流道与两个微腔组成,通过改变微流道的深宽比和微腔的半径,分析了该滤波器的带宽特性。结果表明,随着微通道的深宽比减小,滤波器的截止频率按指数衰减;截止频率随着微腔半径的增加也呈指数下降。验证了微流控等效理论分析结果与流路仿真结果一致。Microfluidic filter plays an important role in frequency selection of alternating flow path,obtaining specific frequency or stable AC fluid output.Based on the theory of microfluidic equivalent circuit,aπ-type microfluidic second-order low-pass filter was designed.The microfluidic filter consists of three sections of rectangular microchannel and two micro-cavities.The bandwidth characteristics of the filter were analyzed by changing the aspect ratio of the microchannel and the radius of the micro-cavity.The results show that the cut-off frequency of the filter decreases exponentially with the aspect ratio of the microchannel.The cut-off frequency decreases exponentially with the increase of the micro-cavity radius.It was verified that the results of microfluidic equivalent theoretical analysis were consistent with the simulation results of flow path.

关 键 词：微流控技术 滤波器 等效电路理论 深宽比 截止频率 微腔 

分 类 号：TN713[电子电信—电路与系统] O357[理学—流体力学]