Satellite Communications/satellite footprint
Can you please explain how a satellite footprint was being shaped?
ANSWER: Hi Alfredo,
Satellite footprint is shaped based on the Required Region of Coverage. The antennae of satellite are shaped for the coverage beam width. The beam shaping is dependent on the Frequency of the transponders and particularly the higher the frequency the smaller the beam width: so there may be multiple SPOT beams for single Uplink for Ku and Ka Bands. The footprint is actually the Ground Trace of the specific shaped beam Antenna pattern. The antenna feed design and the location decide the footprint in stabilised mode of the satellite.
---------- FOLLOW-UP ----------
QUESTION: Hi GTRao,
This is a follow up question. In most satellite footprint, the beam shaped is not irregular in shape, does this mean that the antenna is also irregular shape?
I think you are confused between Beam Shaping and the foot print, i wish my assumption is wrong! Foot print is not in regular shape because of the geographical nature of the Earth and beam shaping is done by dsigning the antenna with offsetting the feed position or using reflectors and directors based on the requirements. There is no physical irregularity in Antenna.. it is electronically steered for getting the beam pattern for coverage.