Abstract: The invention relates to a method for manufacturing an antenna for a radiofrequency transponder, said antenna including a spiral comprising turns which extend, at least in part, over an insulating substrate; the method is characterised in that it includes the step ac-cording to which at least one first portion of each turn is deposited on said substrate at a first plane level, at least one second portion of each turn being formed or kept at a distance from the first plane level of the substrate, the axis of the spiral being parallel to the plane of the substrate. The invention also relates to a portable electronic object comprising, in a fixed or removable manner, the obtained antenna.

Abstract: Provided is a method for manufacturing a radiofrequency chip card. The method comprises the steps of: forming a card body comprising a relay antenna and an insulating cover layer on at least one main face of the card, arranging a module equipped with a radiofrequency module antenna on the card body opposite the relay antenna for radiofrequency coupling; forming a metal insert in the card body, the insert extending up to the edges of the card and comprising a space permeable to the radiofrequency field opening on at least one of the two main faces of the insert and comprising the relay antenna inside and/or opposite this space. Provided also is a corresponding card produced by the method.

Abstract: A method for producing a metal insert for a radio-frequency chip card includes the steps of forming or providing an assembly comprising an insulating substrate bearing: at least one antenna coil resting on the substrate, comprising a connection interface to a radio-frequency module, a metal plate comprising radio-frequency permittivity perforations and a cavity for receiving a radio-frequency chip module, respectively arranged facing the antenna coil and its connection interface. The perforations comprise at least two longitudinal slots extending along and facing a portion of the antenna coil, each slot also opening onto the edge of the plate via a passage arranged on the edge. The invention also relates to a corresponding card produced by the method.

Abstract: A method for producing a metal insert for a radio-frequency chip card includes the steps of forming or providing an assembly comprising an insulating substrate bearing: at least one antenna coil resting on the substrate, comprising a connection interface to a radio-frequency module, a metal plate comprising radio-frequency permittivity perforations and a cavity for receiving a radio-frequency chip module, respectively arranged facing the antenna coil and its connection interface. The perforations comprise at least two longitudinal slots extending along and facing a portion of the antenna coil, each slot also opening onto the edge of the plate via a passage arranged on the edge. The invention also relates to a corresponding card produced by the method.

Abstract: The invention relates to a radiofrequency antenna circuit comprising at least one electrically conductive portion, in particular in the form of a track or wire, forming a first spiral having first turns and two end portions. The invention includes a second spiral extending substantially away from one of the end portions, along and between the turns of said first spiral. The invention also relates to a radiofrequency device comprising the antenna circuit.

Abstract: The invention relates to a radiofrequency antenna circuit comprising at least one electrically conductive portion, in particular in the form of a track or wire, forming a first spiral having first turns and two end portions. The invention includes a second spiral extending substantially away from one of the end portions, along and between the turns of said first spiral. The invention also relates to a radiofrequency device comprising the antenna circuit.

Abstract: The invention relates to a method for manufacturing an antenna for a radiofrequency transponder, said antenna including a spiral comprising turns which extend, at least in part, over an insulating substrate; the method is characterised in that it includes the step ac-cording to which at least one first portion of each turn is deposited on said substrate at a first plane level, at least one second portion of each turn being formed or kept at a distance from the first plane level of the substrate, the axis of the spiral being parallel to the plane of the substrate. The invention also relates to a portable electronic object comprising, in a fixed or removable manner, the obtained antenna.