Feeders

Matching – Quarter Wave Transformer (1)

  • On an unmatched transmission line impedance at any point varies due to standing waves
  • A transmission line stub that is an electrical quarter wavelength long (λ/4) at the operating frequency (i.e. velocity factor is taken into consideration) may be used as a matching transformer to match an antenna and feeder
  • The relationship is …
  • Zstub = √(Zantenna × Zfeeder)