A novel method is proposed to reduce the ultra-wideband (UWB) far-end crosstalk (FEXT) of the parallel microstrips (MSs), in which subwavelength periodically loaded transmission lines (PLTLs) with discontinuous structured guard lines (DSGLs) are appropriately used. The motivation is to innovate a structure to eliminate the FEXT for devices in microwave and millimeter-wave band. In the scheme, the single PLTL has enhanced self-inductance, and the PLTL pairs with interline DSGLs can realize added mutual capacitance and slightly changed mutual inductance, comparing with the conventional MS pairs. Therefore, the equalization of capacitive coupling ratio and the inductive coupling ratio is realized, which dramatically reduce the FEXT in a wide bandwidth range. The lumped parameters are extracted for mechanism validation, then several MS circuits are designed on FR-4 PCB by full-wave simulation. The comparisons with the previous methods indicate that the best cancellation of the FEXT is achieved by the proposed method. To demonstrate the design strategies, MS circuits operating from DC to 40 GHz are designed using the above proposed method and further fabricated on Al2O3 ceramic board of 0.127-mm thickness. The measured results reveal that more than 35-dB FEXT suppression is obtained from DC to Ka-band, indicating the validity of the proposed method.

中文翻译：

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减少具有不连续结构保护线的平行周期性负载传输线的微波和毫米波频段中的 UWB 远端串扰

提出了一种减少平行微带 (MS) 的超宽带 (UWB) 远端串扰 (FEXT) 的新方法，其中适当地使用了具有不连续结构保护线 (DSGL) 的亚波长周期性加载传输线 (PLTL) . 其动机是创新一种结构，以消除微波和毫米波频段设备的 FEXT。在该方案中，单个PLTL具有增强的自感，与传统MS对相比，具有跨线DSGL的PLTL对可以实现增加的互电容和略微改变互感。因此，实现了电容耦合比和电感耦合比的均衡，从而在宽带宽范围内显着降低了 FEXT。提取集总参数用于机制验证，然后通过全波仿真在FR-4 PCB上设计了几个MS电路。与先前方法的比较表明，所提出的方法实现了对 FEXT 的最佳消除。为了演示设计策略，使用上述方法设计了从 DC 到 40 GHz 的 MS 电路，并在 0.127 毫米厚的 Al2O3 陶瓷板上进一步制造。测量结果表明，从 DC 到 Ka 波段获得了超过 35 dB 的 FEXT 抑制，表明所提出方法的有效性。使用上述方法设计了从 DC 到 40 GHz 的 MS 电路，并在 0.127 毫米厚的 Al2O3 陶瓷板上进一步制造。测量结果表明，从 DC 到 Ka 波段获得了超过 35 dB 的 FEXT 抑制，表明所提出方法的有效性。使用上述方法设计了从 DC 到 40 GHz 的 MS 电路，并在 0.127 毫米厚的 Al2O3 陶瓷板上进一步制造。测量结果表明，从 DC 到 Ka 波段获得了超过 35 dB 的 FEXT 抑制，表明所提出方法的有效性。