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US 4,208,661 AGranted
Antenna with two orthogonally disposed parabolic cylindrical reflectors
OwnerVaclav J. Vokurkainventor
Life of this patent
Estimating the term…
Abstract
An antenna set-up comprising a first and a second reflector in the form of substantially parabolic cylinder surfaces and a feed source, directed to the first reflector and placed on the focal line of that reflector and in which set-up the directrix of the cylindrical wave front obtained by exposure of the first reflector coincides with the focal line of the second reflector and the focal line of the first reflector is not parallel to the symmetry plane of the second reflector.
Claims3
An antenna system, comprising:
- first and second reflectors in the form of substantially parabolic cylindrical surfaces and having respective first and second focal lines and first and second symmetry planes, said first focal line being skewed with respect to said second symmetry plane and said first and second symmetry planes being crossed with one another;
- the directrix of said first reflector being coincident with said second focal line in said second plane of symmetry,
- a point feed source directed towards said first reflector having a phase center and located on said first focal line, said feed source have an axis disposed at an angle other than 90.degree. from said first focal line so as not to cast a shadow on said second reflector;
- and
- whereby the apparent line source of the cylindrical wave front produced by illumination of said first reflector coincides with said second focal line.
2 more elements
An antenna system, comprising:
- first and second reflectors in the form of substantially parabolic cylindrical surfaces and having respective first and second focal lines and respective first and second symmetry planes, said first and second symmetry planes being crossed with respect to one another;
- the directrix of said first reflector being coincident with said second focal line in said second plane of symmetry, said first focal line being skewed with respect to said second symmetry plane;
- A point feed source directed towards said first reflector and located on said first focal line, said feed source having an axis which is disposed at an angle other than 90.degree. from said first focal line and which is lying in said first symmetry plane so as not to cast a shadow on said second reflector;
- whereby the apparent line source of the cylindrical wave front produced by illumination of said first reflector coincides with said second focal line.
1 more element
An antenna system, comprising:
- first and second reflectors in the form of substantially parabolic cylindrical surfaces and having respective first and second focal lines and respective first and second symmetry planes crossed with one another;
- the directrix of said first reflector being coincident with said second focal line in said second plane of symmetry, said first focal line being skewed with respect to said second symmetry plane;
- a point feed source directed towards said first reflector having a phase center located on said first focal line, said feed source having an axis which is disposed at an angle other than 90.degree. from said first focal line and which is being skewed with respect to said symmetry plane so as not to cast a shadow on said second reflector;
- and
- whereby the apparent line source of the cylindrical wave front produced by illumination of said first reflector coincides with said second focal line.
2 more elements
Dependencies are inferred from the claim text.