France Telecom

Jean-Marc Toureilles

Jean-Pierre Blot

Ala Sharaiha

Claude Terret

The invention relates to a helix antenna with integrated duplexing means comprising two decoupled coaxial helices, each formed by radiating strands ( to ) printed on a substrate, each of the helices being associated with an independent and miniaturized structure ( ) for the wideband supply of the radiating strands, the supply structures being printed on the corresponding substrate and comprising at least one hybrid coupler ( ) made out of semi-localized elements so as to reduce the dimensions thereof. Advantageously, the helices are wound in opposite directions of winding ( ) and their points of excitation are offset with respect to each other, in a plane perpendicular to the axis of the helices. Corresponding methods of manufacture are used to form the helix antenna.

Helical antenna with built-in duplexing means, and manufacturing methods therefor

A resonant helix antenna comprising at least one helix formed by at least two radiating strands (,to,) printed on a substrate. This antenna comprises a miniaturised structure for the wideband supply of the radiating strands that is printed on the substrate and comprises at least one hybrid coupler made out of semi-localised elements so as to reduce the dimensions thereof. In the case of a quadrifilar helix, formed by four radiating strands, the supply structure comprises three hybrid couplers, for example in the form of a first 180&deg; hybrid coupler (,) associating a supply input and/or output (,) of the antenna with two intermediate outputs and/or inputs (,) phase-shifted by 180&deg; and two 90&deg; hybrid couplers (,) each associating one of the intermediate outputs and/or inputs of the hybrid coupler with one of the ends of two of the radiating strands.

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Lorient, France

Jean-Marc Toureilles