介电常数对PCB板性能影响的四个方面

摘要

This text elaborated dielectric constant effecting on PCB’s function in transmission speed of signal,bibulous rate,characteristic impedance,ant-ionic migratority and etc.From the applied angle and measure method of dielectric constant,this paper analyzed dielectric constant how to influence on transmission speed in PCB,concrete measure on lowering dielectric constant and loss tangent,and reasons ion migrate in electric field and coping ways.%从应用的角度阐述了介电常数对PCB板在信号传输速度、吸水率、特征阻抗、耐离子迁移性等性能方面的影响以及介电常数的测量方法,重点分析了介电常数是如何影响PCB信号传输速度的,降低介电常数和介电损耗的具体措施,以及离子在电场作用下迁移的原因和应对办法。