Printed circuit boards (PCBs) commonly use the dielectric material FR-4 for the

Question

Printed circuit boards (PCBs) commonly use the dielectric material FR-4 for the insulation substrate. FR-4 can be characterized with mu = mu0, epsilon = 4.8 epsilon 0, and sigma = 0. To make a microstrip line, thin copper foils are laminated to both sides of the dielectric substrate. The breakdown voltage of dielectric is 2x107 V/m (20 MV/m). Use a safety factor of 10 so that the allowed maximum electric field strength is 2*106 V/m. If we choose the microstrip line with the dimensions a = 0.15 cm, w = 0.71 cm, where a is the dielectric thickness and w is the width of the stripline. (1) What is the cutoff frequency for the TEM mode? (2) Find the maximum time-average power that the stripline can transmit. "Neglect the ohmic loss.

Explanation / Answer

Microstrip is the type of microwave circuit interconnection thatwe will use in this course. This

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