Antennas

Yagi Antenna (3)

  • Where no RF energy is fed to these extra elements they are called parasitic elements and they get power through electromagnetic coupling with the driven element
  • The three element Yagi shown on the previous slide has a parasitic reflector, a parasitic director and a dipole driven element to which the RF signal is fed
  • Parasitic reflectors and directors are respectively about 5% longer and shorter than the driven element and further directors would usually get progressively shorter