The improvement of signal quality and far-end crosstalk for coupled microstrip line over a completely split ground plane

In the modern generation of digitally high-speed data transmission, multiple power level demands may be required. In the view of signal integrity, the worst case is to cut completely a slit on the ground plane during traces traversing over because the scenario like that will lead to serious signal quality and crosstalk problems. So here we proposed one new solution to improve signal quality and far-end crosstalk (FEXT) by using interdigital capacitor. The basic working principle of this structure is by the property of the displacement capacitor and it needs no extra components. The experimental results indicated that our solution could improve signal quality and reduce FEXT by 29.87% and 8.87% in the time domain, respectively. And the result of eye diagram under 6 Gbps bit rate also showed the improvement of eye height 59% and eye width 7%. The statement above showed that our design requires no extra components to improve signal quality and reduce FEXT.