Important tips about Microwave Antenna

[Mohamed.Saeed]

• It’s directional antenna, which means it focus the signal in one beam.

• Antenna transmit & receive the signal point to point and it generate lobes.

• There’s 2 types of lobes:

  1. Main lobe : it contain majority of power and it directed towards farend antenna.

  2. Side lobe : act as Interference.

• Antenna has 2 types :

  1. Short haul: small size, used for short distance , use high frequency.

  2. Long haul: large diameter , used for long distances with low frequency range.

• Antenna in microwave use frequency range from 4-86 GHz (traditional band , V band , E band)

• Large antennas should be assembled because it consists of:

  1. Wwaveguide interface
  2. Reflector
  3. Radome
  4. Shield / absorber
  5. Antenna feed
  6. Antenna mount

• The most important part is the antenna feeder , other parts used to mount the antenna and reduce the side lobe.

• Antenna diameter is from 20 cm to 4 meters.

• Antenna gain is the ability of the dish to focus and direct the beam to the far end.

• Antenna gain= directivity and it measured by dbi (referred to isotropic).

• Antenna gain could reach 40 d|Bi or more.

• Antenna installed with outdoor unit using these 2 methods:

  1. Direct mounting
  2. Separate mounting

• If separate mounting used, we should connect the dish antenna with outdoor unit using waveguide

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