Evaluation of fibre weaving of substrate on differential microstrip using an analytical approach

Depending on the PCB fiber weave style, electrically long differential microstrip signal traces may introduce significant signal skew due to weave effect that deteriorates the signal quality. As closed-form expression for the effective permittivity that includes the weave effect is not readily available, full-wave method is often used to study the weave effect. As such, a novel analytical method is proposed in this paper to study the fibre weave effect in differential microstrip.