微带线直角弯曲最佳斜切率研究  

Research on the optimal percentage miter of the microstrip right angle bend

作　　者：路宏敏[1] 吴保义[1] 姚志成[2] 万连城[1] 

机构地区：[1]西安电子科技大学电子工程学院,陕西西安710071 [2]解放军第二炮兵工程学院,陕西西安710025

出　　处：《西安电子科技大学学报》2009年第5期885-889,共5页Journal of Xidian University

基　　金：国家自然科学基金资助(60571059)

摘　　要：PCB印制线直角弯曲引起的微带线特性阻抗不连续性严重影响高速电路信号传输质量.基于微带线结构参数及相对介电常数对印制线直角弯曲45度外斜切最佳斜切率M影响的数值分析结果和最小二乘法原理,应用MATLAB对数值结果进行曲线拟合,提出了M与印制线宽厚比w/h的函数表达式,以及50Ω特性阻抗微带线M与相对介电常数的线性关系.结果显示:具有最佳斜切率的印制线直角弯曲45度外斜切能够很好地保障最佳信号传输质量;相对介电常数和印制线厚度t对M影响小,而宽厚比w/h对M影响显著.In a high-speed circuit, microstrip characteristic impedance discontinuity caused by the right angle bend of PCB traces affects the quality of the signal transmission seriously. The numerical results of the impact of microstrip structure parameters and relative dielectric constant on the optimal percentage miter M of trace right angle bend with a 45°out miter are obtained. Based on the principle of least squares, the formula for M versus the width-to-height ratio w/h is presented by fitting the numerical results with MATLAB. Similarly, the linear expression for M versus the relative dielectric constant is also presented for the 50 Ω line. The results show that the trace right-angle bend with a 45°out optimal percentage miter makes the quality of the signal transmission best. And the impact of relative dielectric constant and thickness of microstrip on M is not obvious, but the impact of w/h on M is significant.

关 键 词：微带线 直角弯曲 45°斜切 最佳斜切率 

分 类 号：TN817[电子电信—信息与通信工程]