What impedance does a 1/4-wavelength transmission line present to an RF generator when the line is shorted at the far end?
Very high impedance✓Bonne réponse
Very low impedance
The same as the characteristic impedance of the transmission line
The same as the generator output impedance
Explication
A quarter-wave line inverts what is on its far end, turning a short circuit into an open one. The generator therefore sees a very high impedance, and the section behaves like a parallel-resonant circuit at that frequency.