印制板实测阻抗反推介质介电常数的研究

Research of Using Measured Impedance to Deduce Dielectric Constant

为实现印制板的阻抗精确设计,通过设计阻抗测试图形和借助阻抗模拟计算软件,用迭代分析反推出介电常数,然后用介电常数再计算出理论阻抗,并将其与实际阻抗测试结果进行比较分析。结果表明:将试验反推得出叠层结构中各不同介质的介电常数用于阻抗设计,理论设计阻抗值与实测阻抗值吻合。

To realize the accurate design of impedance of printed circuit board, the dielectric constant was deduced by impedance simulation software with iterative method, then the dielectric constant was used to calculate theoretical impedance, and the theoretical impedance was compared with the actual measured impedance. The results show that using the deduced dielectric constant to impedance design, the theoretical impedance value coincides with the actual measured impedance value.