Comparison of Mechanical and Electrical Downtilt

Comparison of Mechanical and Electrical Downtilt
 



 Mechanical

• The downtilt angle varies over the horizontal
  beamwidth. Patterns measured ±90° from the center of
  the beam have decreasing tilt angle until there is no
  tilt 90° from the main beam.
• The horizontal half-power beam width increases with
  greater downtilt angle.
• The resulting gain reduction depends on azimuth
  direction.

Electrical

• There is uniform downtilt over the whole
  azimuth range.
• The horizontal half-power beamwidth is
  independent of the downtilt angle.
• There is identical gain reduction in all azimuth
  directions.

sumber : Katherin Technical Bulletin #116 January 1999