The development in wireless communication indrirectly gives impact on complexties of electronics circuit design both in the transmitter and receiver. One of the complexities is PCB trace design. Designer, as one of the considerations, has to estimate crosstalk between trace carefully. This paper proposed a method to estimate crosstalk using scattering matrix. A parallel microstrip line was modelled in straight form. For the second, a parallel microstrip was modelled in bending form. The simulation result shows that crosstalk in term of reflected voltage tend to increase with frequency. But there was an anomaly, certain frequency give a minimum crosstalk. Crosstal decrease when the distance between separated lines increaed