Antenna having radiation pattern with main lobe of generally elliptical cross-section
AssigneeCSELT - Centro Studi e Laboratori Telecomunicazioni S.p.A.
InventorsSalvatore De Padova, Enrico Pagana, Giorgio Rosenga
Life of this patent
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Abstract
An antenna designed to emit a beam of generally elliptical cross-section has a reflector with a parabolic-elliptical concave surface conforming to the formula (x/p)+(y/q)=2z where p and q are the parameters of its parabolic cross-section in the xz and yz planes, respectively. A microwave feed located on a line interconnecting the foci of these two parabolas, preferably at the outer focus separated from the surface vertex by a distance q/2, generates a beam parallel to the axis whose ellipticity depends on the ratio q/p.
Claims6
An antenna having a radiation pattern with a main lobe of generally elliptical cross-section, comprising:
- a reflector with a concave surface whose cross-sections in two mutually orthogonal planes substantially define segments of respective parabolas of different parameters p and q with p.noteq.q, said parabolas having a common vertex and different foci on a common axis passing through said vertex, said surface intersecting a plane transverse to said common axis in a generally elliptical curve;
- and
- a source of microwaves trained upon said concave surface, said source being located with its phase center of radiation in a zone bounded by two imaginary spherical surfaces of respective radii p/2 and q/2 centered on said vertex and passing through said foci, thereby establishing a radiation pattern with a main lobe of generally elliptical cross-section.
Dependencies are inferred from the claim text.