基于周期性枝节加载的微带线串扰抑制研究  

Crosstalk suppression in microstrip lines based on periodic branch loading

作　　者：李恪鹏 钟选明[1] 尚玉平 廖成[1] LI Kepeng;ZHONG Xuanming;SHANG Yuping;LIAO Cheng(Institute of Electromagnetic Field and Microwave Technology,School of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学物理科学与技术学院电磁场与微波技术研究所,四川成都610031

出　　处：《电子元件与材料》2024年第4期461-467,共7页Electronic Components And Materials

基　　金：国家自然科学基金(62271416)。

摘　　要：针对当前印刷电路板上相邻微带线之间的串扰抑制问题,提出了一种在超宽带频率范围内利用周期性耦合枝节来抑制微带线远端串扰的电磁兼容设计。在串扰的形成原因分析基础上,该设计将沿传统微带线纵向方向加载的周期性开路枝节进一步与相邻两条微带线之间周期性加载的工字型耦合枝节相结合。微带线上的开路枝节以及线间的耦合枝节主要用于增加微带线等效自感和线间等效互容,并减小线间等效互感,由此显著降低远端串扰强度。同时,线间等效互感的减小能抑制因容性耦合增大而导致的近端串扰上升。全波结果表明,该设计在1~20 GHz范围内可使相邻微带线的远端串扰强度小于-48 dB,且物理结构中不涉及金属化通孔,具有几何结构简单、成本低和可布线空间大等特点。To solve the problem of the crosstalk suppression between adjacent microstrip lines on the current printed circuit board,an electromagnetic compatibility design was presented.In this design,periodic coupling branches was utilized to suppress far-end crosstalk on microstrip lines in the ultra-wideband frequency range.Based on the causes of the crosstalk formation,the periodic open-circuit branching was further combined with I-beam coupled branching.The periodic open-circuit branches were loaded in the longitudinal direction of the conventional microstrip lines,and periodic I-beam coupled branches were loaded between two neighboring microstrip lines.The open-circuit branches on the microstrip lines and coupling branches between the lines were used in order to increase the equivalent self-inductance and the equivalent mutual capacitance of the microstrip lines and reduce the equivalent mutual inductance of the lines,which significantly reduced the intensity of the far-end crosstalk.In addition,the reduction of the equivalent mutual inductance between the lines could suppresse the rise in near-end crosstalk due to the increase in the equivalent mutual capacitance.The full-wave test results show that the distal crosstalk intensity of adjacent microstrip lines is reduced to less than-48 dB in the range of 1 GHz to 20 GHz,and the physical structure does not involve metallized vias,which has the characteristics of simple geometric structure,low cost and large wiring space.

关 键 词：串扰 微带线 防护线 超宽带 周期加载 

分 类 号：TN817[电子电信—信息与通信工程]