An Application of the Subwavelength Periodic Microstrip Guard Trace in High-Speed Circuits

This paper proposed a kind of guard traces based on subwavelength periodic structure to reduce the far-end crosstalk (FEXT) parallel microstrip lines in PCB. technology can be used improve false triggering and signal transmitting capacity multiconductor transmission line circuit system. In order explore present novel trace effect isolating electromagnetic interference (EMI), frequency response mutual capacitance inductance overall system was provided an equivalent model built. comparison conventional for EMI between lines, efficiently Thus, it is favorable suppressing lines. The $S$ -parameters calculation result showed that this isolate two more effectively. Particularly, grounded needs lot dense holes, which severely influences wiring design various layers multilayer board. However, requires only one hole, has little influence each layer printed our experiment, step function 30 ps rise time imported into measure FEXT other line. It demonstrated by measurement below 5% amplitude flexible practice. compliance with actual demand high-speed circuit, three isolation structures were proposed, their effects coupling verified individually.