Question

Using a transmission line simulator, the p.u.I. capacitance of a microstrip line has been measured as 250pF/m. In a second simulation, the dielectric has been replaced with air, and a p.u.l. capacitance of 100pF/m has been obtained.

a) Find the effective dielectric constant for the microstrip line.

Answer 1

The effective dielectric constant for the microstrip line can be found by dividing the p.u.I. capacitance with the actual dielectric by the p.u.l. capacitance with air as the dielectric.

Step-by-step explanation:

To find the effective dielectric constant for the microstrip line, we can use the formula:

K = C_air / C_dielectric

where K is the effective dielectric constant, C_air is the p.u.l. capacitance with air as the dielectric, and C_dielectric is the p.u.I. capacitance with the actual dielectric.

Substituting the given values, we have K = 100pF/m / 250pF/m = 0.4

Therefore, the effective dielectric constant for the microstrip line is 0.4.