Abstract: Disclosed is a device (D?) for near-field radiofrequency communication with a portable element, the device including: at least one near-field communication primary antenna (A0) having a predetermined communication frequency (Fc); and a microcontroller (30?) electrically connected to the primary antenna, including a power supply source for the primary antenna and a receiver unit for the data (20?) received by the primary antenna. The communication device further includes: at least one passive relay antenna (A1 . . . A8), juxtaposed with the primary antenna, relay frequencies (F1 . . . F8), lying within a range of values around the predetermined communication frequency (Fc), but different from the predetermined communication frequency (Fc), electrically connected to the data receiver unit. Also included is a unit (C4) for adjusting the relay frequency. The communication device can be used to enlarge the near-field communication surface of the communication device.

Abstract: A near-field communication device includes: a processing module and a first antenna arranged in a first near-field communication area and connected to the processing module; a first presence detector arranged in the first area; a second antenna arranged in a second near-field communication area, the first antenna and the second antenna being electrically in series and forming a circuit of antennae; a second presence detector arranged in the second area; and a control circuit designed to place the circuit of antennae into at least two different operating modes: a) a first mode, termed ‘functional mode’, in which the circuit of antennae allows near-field communication, and b) a second mode, termed ‘dysfunctional mode’, in which the circuit of antennae does not allow near-field communication.

Abstract: A near-field communication device includes: a processing module and a first antenna arranged in a first near-field communication area and connected to the processing module; a first presence detector arranged in the first area; a second antenna arranged in a second near-field communication area, the first antenna and the second antenna being electrically in series and forming a circuit of antennae; a second presence detector arranged in the second area; and a control circuit designed to place the circuit of antennae into at least two different operating modes: a) a first mode, termed ‘functional mode’, in which the circuit of antennae allows near-field communication, and b) a second mode, termed ‘dysfunctional mode’, in which the circuit of antennae does not allow near-field communication.

Abstract: Disclosed is a device (D?) for near-field radiofrequency communication with a portable element, the device including: at least one near-field communication primary antenna (A0) having a predetermined communication frequency (Fc); and a microcontroller (30?) electrically connected to the primary antenna, including a power supply source for the primary antenna and a receiver unit for the data (20?) received by the primary antenna. The communication device further includes: at least one passive relay antenna (A1 . . . A8), juxtaposed with the primary antenna, relay frequencies (F1 . . . F8), lying within a range of values around the predetermined communication frequency (Fc), but different from the predetermined communication frequency (Fc), electrically connected to the data receiver unit. Also included is a unit (C4) for adjusting the relay frequency. The communication device can be used to enlarge the near-field communication surface of the communication device.