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非平行微带线作为电路板上常见的电气连接方式,因夹角的存在导致线间耦合复杂且很难预测,一直未被给予足够的关注。基于此情况,建立非平行微带线耦合模型,在验证模型有效性的基础上,使用有限元法(FEM)详细研究由平行到非平行转变导致的串扰曲线演变过程。验证使用防护带及宽度变化对非平行微带线间串扰抑制的有效性。为保证衰减效果和节约制板费用,提出使用短防护带进行串扰抑制,同时研究短防护带起始位置对抑制效果的影响。考察串扰对接地孔半径变化时的依赖性,通过计算得到了与已有文献不同的结论。通过对这些关系的详细分析进而总结相应的规律,为非平行微带线及防护带的优化设计提供理论指导。
Non-parallel microstrip line as a common electrical connection on the circuit board, due to the existence of the angle between the wire coupling complex and difficult to predict, has not been given enough attention. Based on this, a nonparallel microstrip coupling model is established. Based on the validation of the model, the finite element method (FEM) is used to study the evolution of the crosstalk curve caused by parallel to non-parallel transition. Verify the effectiveness of using guard bands and variations in width to suppress crosstalk between non-parallel microstrip lines. In order to ensure the attenuation effect and save the board cost, the paper proposes the use of a short guard band for crosstalk suppression and studies the effect of a short guard band starting position on the suppression effect. The dependence of the crosstalk on the radius of the ground hole was investigated. The conclusion different from the existing literature was obtained by calculation. Through the detailed analysis of these relations and then the corresponding laws are summarized, providing theoretical guidance for the optimal design of non-parallel microstrip lines and guard bands.