What impedance does a 1/8-wavelength transmission line present to an RF generator when the line is open at the far end?
The same as the characteristic impedance of the line
An inductive reactance
A capacitive reactance✓Correct answer
Infinite
Explanation
An open-ended line shorter than a quarter wavelength behaves as a capacitor. At one eighth wavelength the electrical length is 45 degrees, so the input reactance is capacitive and numerically equal to the characteristic impedance.