Crosstalk between coupled microstrip lines can degrade the signal integrity. To reduce the crosstalk, Guard Trace filled vias which are shorted to reference plane can be inserted in the side of aggressor line to prevent the unwanted noise. In this thesis, the vias of a grounded guard trace to decrease the coupling strength between the microstrip lines is proposed. Additionally, experimental results, while compared with simulations, are presented to demonstrate the effects of guard traces on the prediction and generation of crosstalk noise in time domain. Using guard traces to improve TDR and TDT signal integrity and Eye diagrams are performed in this thesis. In other hands, differential signaling is another popular choice for multi-gigabit digital applications in favor of its low-noise generation and high common-mode noise immunity. In this thesis presented a design frequency dependence method to extract the equivalent trace length of discontinuity bend. It can obtain the best common mode noise.