Feed apertures with crosspolarization compensation for linear polarization
AssigneeGeneral Electric Company
InventorRaymond J. Meier
Life of this patent
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Abstract
The crosspolarization components radiated by adjacent orthogonally linearly polarized feed horns of a reflector antenna system are compensated by structural modifications incorporated in the feed horns. In a first embodiment, the modified feed horns have curved walls and included shaped septa. Other embodiments involve the use of shaped walls or shaped septa only. In the case of an offset reflector, asymmetric modifications of the wall shape and septa are employed. For flared feed horns with rectangular cross section, the crosspolarization compensation is provided by curving the forward edges of the horn walls convexly or concavely as required.
Claims40
An antenna system, comprising:
- a reflector;
- at least a pair of feed horns located in the focal region of said reflector, said feed horns being positioned adjacent each other with the axis of each horn pointed at said reflector;
- means for radiating beams in the same frequency band from said pair of feed horns at said reflector effective to reflect a pair of corresponding beams from said reflector;
- and
- compensation means incorporated in the structure of each of said feed horns, each of said compensation means being configured to alter the beam radiated from its feed horn in a manner which reduces crosspolarization components in the corresponding reflected beam, said reduction of crosspolarization components being effective to provide substantially linear polarization in said pair of reflected beams in mutually orthogonal directions.
An antenna system, comprising:
- a reflector;
- a feed horn located in the focal region of said reflector, said feed horn being positioned with its axis pointed at said reflector;
- means for radiating a beam from said feed horn at said reflector effective to reflect a beam from the latter, said radiated beam having a dominant linear polarization accompanies by spurious crosspolarization;
- and
- compensation means incorporated in the structure of said feed horn, said compensation means being configured to provide said radiated beam with a polarization modification adapted to reduce crosspolarization components in said reflected beam to an extent where said reflected beam is substantially linearly polarized.
An antenna system as recited in claiim 38, wherein said edges are curved convexly.
Dependencies are inferred from the claim text.