PCB传输线表面粗糙度对信号完整性的影响  

The influence of PCB transmission line surface roughness on signal integrity

作　　者：文丽梅 翟可鹏 曾佳 WEN Limei;ZHAI Kepeng;ZENG Jia(Zhuhai Kinwong Flexible Circuit Co.,Ltd.,Zhuhai 519070,Guangdong,China)

机构地区：[1]珠海景旺柔性电路有限公司,广东珠海519070

出　　处：《印制电路信息》2023年第9期31-36,共6页Printed Circuit Information

摘　　要：在高频印制电路板(PCB)中,传输线的表面粗糙度对信号完整性影响较大。本研究通过使用ANSYS HFSS三维电磁仿真软件模拟了不同表面粗糙度对传输线插入损耗的影响,并参照模型,制作不同粗糙度表面的样品进行实测,验证出传输线的插入损耗会随着表面粗糙度的增加逐步增大,但增大幅度会逐渐趋于平缓。当表面粗糙度<1μm时,其变化对插入损耗有明显影响,但当表面粗糙度>1μm时,其变化对插入损耗影响较小。同时研究了不同镀铜方式和前处理方式对表面粗糙度的影响,获得粗糙度相对最小的镀铜和表面处理方式组合。In high-frequency printed circuit board(PCB/FPC),the surface roughness of the transmission line has a great impact on signal integrity.In this study,the influence of different surface roughness on transmission line insertion loss was simulated by using ANSYS HFSS three-dimensional electromagnetic simulation software,and samples of different roughness surfaces were made for measurement with reference to the model.It is proved that the insertion loss of transmission line will gradually increase with the increase of surface roughness,but the increase amplitude will gradually be gentle.When the surface roughness is<1μm,the change of the surface roughness has a significant effect on the insertion loss,but when the surface roughness is>1μm,the change of the surface roughness has a small effect on the insertion loss.At the same time,the influence of different copper plating methods and pretreatment methods on surface roughness was studied,and the combination of copper plating and surface treatment methods with relatively minimum roughness was obtained.

关 键 词：高频印制电路板(PCB/FPC) 表面粗糙度 插入损耗 微蚀体系 

分 类 号：TN41[电子电信—微电子学与固体电子学]