What is the velocity of a signal propagating along the strip line of Exercise 15.6? Express your answer in m/s and in a percentage of the speed of light. What is the strip line's propagation delay? Is the delay for the Teflon® PCB longer or shorter than the FR4 PCB?
Exercise 15.6
A 12-in. strip line trace is fabricated on an FR4 PCB with a width of 15 mils. It is separated from its ground plane by a spacing of 12 mils. Using the refined estimates of Figures 15.10 and 15.16, calculate the strip line's parasitic capacitance per meter and inductance per meter. What is the strip line's characteristic impedance? Repeat the exercise for the same strip line fabricated using a Teflon® PCB.