Low cost high performance antenna for use in interactive satellite terminals
First Claim
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1. Interactive Satellite Terminal antenna system comprising:
- an elliptical parabolic main reflector for reflecting an electromagnetic field having a fundamental mode and a cross polar component; and
a compensated feed horn for feeding said electromagnetic field to said elliptical parabolic main reflector, said compensated feed horn having along a longitudinal axis from said elliptical parabolic main reflector an outer elliptical aperture, a step section with at least one slot to excite a higher order mode of reflected electromagnetic field and counteract said cross polar component, and an inner cylindrical waveguide.
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Abstract
The invention relates to a Interactive Satellite Terminal antenna system comprising an antenna to which is associated a feed horn. This antenna systems characterized in that it comprises an elliptical parabolic main reflector and a corrugated feed horn (2) having an outer elliptical aperture and an inner cylindrical waveguide with an inner portion (7) and a step section (8) and in that cavity elements (10) are added to the step section (8) for compensating cross-polar components. The invention can be used in antenna systems.
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Citations
18 Claims
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1. Interactive Satellite Terminal antenna system comprising:
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an elliptical parabolic main reflector for reflecting an electromagnetic field having a fundamental mode and a cross polar component; and
a compensated feed horn for feeding said electromagnetic field to said elliptical parabolic main reflector, said compensated feed horn having along a longitudinal axis from said elliptical parabolic main reflector an outer elliptical aperture, a step section with at least one slot to excite a higher order mode of reflected electromagnetic field and counteract said cross polar component, and an inner cylindrical waveguide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification