Antennas

Parabolic Antenna

  • An antenna located at the focal point of a parabolic reflector (dish) can provide considerable gain with a large capture area
  • A 1.2m diameter parabolic dish at 432 MHz (70 cms) provides about 10dB gain over a half wave dipole
  • The beam width of the signal will be very narrow provided all of the signal energy is at the focal point of the dish
  • These antennas are used at UHF and microwaves and specialised feed systems, often using waveguides (a rectangular section of tube) are used