Feeders

Lines as Tuned Circuits

  • Electrical quarter wave of short-circuited line, at the resonant frequency for which the line is cut, acts as a parallel tuned circuit with high impedance
  • Electrical quarter wave of open-circuited line, at the resonant frequency for which the line is cut, acts as a series tuned circuit with low impedance – can be used to bypass an interfering signal at its resonant frequency