<Li> parabolic reflector, which focuses a beam signal into one point or directs a radiating signal into a beam . </Li> <Li> a passive element slightly longer than and located behind a radiating dipole element that absorbs and re-radiates the signal in a directional way as in a Yagi antenna array . </Li> <Li> a flat reflector such as used in a Short backfire antenna or Sector antenna . </Li> <Li> a corner reflector used in UHF television antennas . </Li>

Define reflector antenna. classify the types of reflector antenna in terms of shapes