What are the effects to which the displacement in association with tracking feeds gives rise?

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The problem of making a tracking feed can best be understood by considering the field in the focal region of a paraboloid when a satellite beacon transmitter is slightly off axis. The focal plane distribution will be unchanged in form, but displaced from the horn axis and the direction of displacement in angle corresponds to the position of the satellite.

The displacement gives rise to three effects.

1.The additional asymmetric waveguide modes are used to detect and extract information of tracking.

2. The energy contained within the main lobe of focal plane distribution fails to enter the horn that can be detected by additional horns outside the main horns.

3.The reduction in gain can be detected.


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