France Telecom

L'etat Francais Represente Par Leministre Des Pastes Telecommunications

Claude Terret

Jean-Pierre Blot

Ala Sharaiha

Jean-Marc Toureilles

Ala Sharatha

Leonid Aupy

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.

Helix antenna with a built-in broadband power supply, and manufacturing methods therefor

Disclosed is a new antenna structure having a quasi-hemispherical radiation pattern and capable of having a relatively wide passband, so that it is possible to define two neighboring transmission sub-bands therein or, again, a single wide transmission band. The antenna is of the type comprising a quadrifilar helix (11) formed by two bifilar helices (11.sub.1, 11.sub.2, 11.sub.3, 11.sub.4) positioned orthogonally and excited in phase quadrature, and including at least one second quadrifilar helix that is coaxial and electromagnetically coupled with said first quadrifilar helix (11). Preferred application to L band communications among geostationary satellites or transiting satellites with moving bodies fitted out with such antennas.

Growing community of inventors

Rennes, France

Claude Terret