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US 4,220,957 AGranted
Dual frequency horn antenna system
AssigneeGeneral Electric Company
InventorPope P. Britt
Life of this patent
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Abstract
A feature of this invention is the provision of an antenna system providing two, coaxial, copolarized, independently focused beams: a relatively wide, low frequency, searching beam, and a relatively narrow, high frequency, tracking beam; and comprising a dual frequency, dual polarization feedhorn; a polarization dependent subreflector; a concave polarization reversing reflector; a concave polarization twisting reflector; and a planar frequency dependent dielectric lens.
Claims8
An antenna system comprising:
- a feedhorn system providing
- a first, relatively low frequency wavefront of energy which is polarized in a first direction, and
- a second, relatively high frequency wavefront of energy which is polarized in a second direction at 90.degree. to said first direction;
- a polarization dependent subreflector for said first frequency spaced forward of said feedhorn system;
- a concave polarization twisting reflector for said first frequency spaced aft of said polarization dependent subreflector;
- a concave polarization reversing reflector spaced aft of said concave polarization twisting reflector by 1/4 wavelength of said first frequency;
- and
- a dielectric lens for said second frequency spaced forward of said polarization dependent subreflector.
5 more elements
Dependencies are inferred from the claim text.