Channel Master Limited

Gerard King

Jamie Stokes

Andrew Patrick Baird

Stephen John Flynn

The present invention relates to antenna feeds ( ) for use in linear or circularly polarised systems. In one embodiment of the invention, a cross-type antenna feed ( ) comprises a cylindrical metal waveguide housing ( ) and a cross-type metal feed body ( ) coupled to the front of the waveguide housing ( ). The feed body ( ) has four peripherally spaced corrugated arm portions ( ) arranged in a mutually orthogonal relationship, where the arm portions ( ) extend radially outwardly from a longitudinal axis ( ) of the feed body ( ). Ridges ( ) on each arm portion ( ) are arranged concentrically around the axis ( ) and parallel thereto, with successive ridges spaced from the axis ( ) in a tiered arrangement. In another embodiment the antenna feed is a dielectric lens. The antenna feed is used in an antenna system having a reflector antenna in addition or in a low noise block (LNB) receiver.

Antenna feed and a reflector antenna system and a low noise block (LNB) receiver, both with such an antenna feed

Multi-frequency antenna feed

The present invention relates to antenna feeds ( ) for use in linear or circularly polarized systems. In one embodiment of the invention, a cross-type antenna feed ( ) comprises a cylindrical metal waveguide housing ( ) and a cross-type metal feed body ( ) coupled to the front of the waveguide housing ( ). The feed body ( ) has four peripherally spaced corrugated arm portions ( ) arranged in a mutually orthogonal relationship, where the arm portions ( ) extend radially outwardly from a longitudinal axis ( ) of the feed body ( ). Ridges ( ) on each arm portion ( ) are arranged concentrically around the axis ( ) and parallel thereto, with successive ridges spaced from the axis ( ) in a tiered arrangement. In another embodiment the antenna feed is a dielectric lens. The antenna feed is used in an antenna system having a reflector antenna in addition or in a low noise block (LNB) receiver.

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Reading, United Kingdom

Gerard King