T型微带线间串扰问题的FDTD分析与抑制

Analysis and Suppression of Crosstalk for T-shaped Microstrip by Using FDTD

T型微带线的串扰是高速电路信号完整性问题中的重要组成部分。采用PML(Perfectly Matched Layer)-FDTD方法首次对T型微带线间的串扰问题进行全波分析,并给出抑制串扰的具体措施。PML-FDTD仿真结果表明,不同的改进结构参数对串扰的影响不同:(1)开口距离S越大线间串扰越小,最多减小10dB;(2)开口角度α越小线间串扰越小,减小幅度最多达14dB。由此得出,在T型微带线上开三角形口,通过改变开口距离S和开口角度α可实现对邻近微带线串扰的有效抑制。

The crosstalk of T-shaped microstrip is the important component in signal integrity of a high-speed circuit. In this paper, the fullwave analysis of the crosstalk is carried out by adopting the Perfectly Matched Layer Finite-Difference Time-Domain （PML-FDTD） method, and then the measures of reducing crosstalk are proposed in detail. The different structure parameters of improved T-shaped microstrip have different influence on the crosstalk. That is, （1） the crosstalk between microstrips is smaller as the orifice distance S is becoming bigger, and the amplitude of crosstalk is reduced to 10dB; （2） The value of α is smaller as the crosstalk between microstrip is becoming smaller correspondingly, and the amplitude of crosstalk is reduced to 14dB. Thus opening an orifice on the T-shaped microstrip can reduce the crosstalk between one T-shaped microstrip and another adjacent one remarkably by changing orifice distance S and angle α.