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Compare and contrast Prime Focus fed Parabolic Reflector Antenna, Offset fed Parabolic Reflector Antenna, and Cass grain Antenna for use as an Earth Station Antenna.

written 8.5 years ago by teamques10 ★ 68k

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This question appears in Mumbai University > Satellite Communication and Network subject

Marks: 5 M

Year: May 2015

satellite communication and network

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written 8.5 years ago by teamques10 ★ 68k

Parameters	Prime Focus-fed Parabolic Reflector Antenna	Offset-fed Sectioned Parabolic Reflector Antenna	Cass grain-fed Reflector Antenna
Form	Main paraboloid and a feed horn in the centre to focus the beam	Main paraboloid and a feed horn outside the main reflector area	Main paraboloid and a sub reflector (hyperboloid)
Diagram
Used for antenna diameter of	Less than 4.5 meters	Less than 2 meters	Between 2.5 meters and 12 meters
Advantage(s)	Even reflection of beam	Eliminates blockage of main beam, improves efficiency, reduces side lobe levels	No beam obstruction, sharp beam focussing, even reflection of beam

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