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Question 563

What impedance does a 1/8-wavelength transmission line present to an RF generator when the line is shorted at the far end?

  1. A capacitive reactance
  2. The same as the characteristic impedance of the line
  3. An inductive reactanceCorrect answer
  4. Zero

Explanation

A shorted line shorter than a quarter wavelength behaves as an inductor. At one eighth wavelength the electrical length is 45 degrees, so the input reactance is inductive and numerically equal to the line's characteristic impedance.

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Question 563: What impedance does a 1/8-wavelength transmission line… · FCC Amateur Extra Class (Element 4) · Questena