Inside Secure

Verimatrix, Inc.

Florian Pernisek

Bruno Charrat

Nicolas Cordier

Frédéric Bernard

In a general aspect, a method can include producing, by an inductive antenna circuit, a first periodic signal that is based on an alternating external magnetic field; producing, by an oscillator circuit, a second periodic signal that is based on the first periodic signal; and transmitting, in correspondence with a data-carrying modulation signal, a sequence of data bits. The transmitting can include sequentially and repetitively: applying, with the oscillator circuit operating in a free oscillation mode, the second periodic signal to the inductive antenna circuit; and inhibiting, with the oscillator circuit operating in a synchronous oscillation mode, application of the second periodic signal to the inductive antenna circuit. The synchronous oscillation mode of the oscillator circuit can cause the second periodic signal to be synchronized to the first periodic signal.

Method and device for modulating an active load

A method for sending data by inductive coupling includes: extracting an antenna signal from an antenna circuit, extracting from the antenna signal a first periodic signal, producing a second periodic signal by way of a synchronous oscillator, placing the oscillator in a free oscillation mode and applying to the antenna circuit the second periodic signal, modifying the impedance of the antenna circuit, restoring the amplitude of the antenna signal, then resynchronizing the oscillator on the first periodic signal.

In a general aspect, a mobile communications apparatus can include a housing and inductive coupling communication circuitry configured to communicate in peer-to-peer mode with a like apparatus. The inductive coupling communication circuitry can include a communication controller and an inductive antenna. The inductive antenna can have at least one loop arranged in series between a first connection point and a second connection point and be proximate to a back wall of the housing. The inductive antenna can be, when the mobile communications apparatus is placed back-to-back in longitudinal and latitudinal alignment with a like mobile communications device, asymmetric with a like inductive antenna of the like mobile communications device, where a ratio of a sum of respective surface areas of mutually opposite surfaces of loops of a same rank of the inductive antenna divided by a sum of respective surface areas of the like inductive antenna is 0.8 or less.

Apparatus comprising inductive coupling communication means

In a general aspect, an electronic device can include a device configured to transmit data by intracorporeal current. The device configured to transmit data by intracorporeal current can include a first electrode configured to be capacitively coupled with a body of a user or capacitively coupled in an intracorporeal current conduction path of the electronic device. The electronic device can further include a circuit configured to electrically bias the first electrode. The circuit can include an electric coil arranged near the first electrode. The electric coil can be configured to, in response to an alternating-current (AC) signal, generate an alternating magnetic field having field lines incident on the first electrode. The field lines incident on the first electrode can induce a current in the first electrode, where the current induces an electric field that generates an intracorporeal current.

Electronic device for transmitting data by inductive coupling and intracorporeal current

In a general aspect, a portable electronic device can include a digital display including a first electrically conductive plane. The first electrically conductive plane can be configured to neutralize electromagnetic radiation produced by the digital display. The portable electronic device can also include a data transmission device configured to transmit data by intracorporeal current. The data transmission device can include a first electrode that is configured to be capacitively coupled with a body of a user and a second electrode that includes the first electrically conductive plane. The first electrically conductive plane can be electrically coupled with an electrical ground of the data transmission device. The portable electronic device can further include a printed circuit including a second electrically conductive plane. The second electrically conductive plane can be included in the second electrode of the data transmission device.

Portable device including an electrode for transmitting data by intracorporeal current

An apparatus including inductive coupling communication circuitry configured to communicate in peer-to-peer mode with an identical apparatus includes an antenna coil presenting, relative to a longitudinal median or a transversal median axis of the antenna coil, an asymmetry corresponding to a coverage rate less than or equal to 0.6 if the antenna coil comprises 4 or more loops, less than or equal to 0.7 if the antenna coil comprises 3 loops, or less than or equal to 0.8 if the antenna coil comprises 1 or 2 loops.

Method and device for modulating an active load with damping of auto oscillation

A data emission/reception device by inductive coupling includes an inductive antenna circuit in which an antenna signal appears, a mechanism configured to for extracting a first periodic signal from the antenna signal, a synchronous oscillator receiving the first periodic signal and supplying a second periodic signal, and an active load modulation circuit configured to apply bursts of the second periodic signal to the antenna circuit. The device is configured to place the oscillator in the synchronous oscillation mode before each application of a burst of the second periodic signal to the antenna circuit, then place the oscillator in the free oscillation mode.

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Aix-en-Provence, France

Florian Pernisek