# US 8,540,162 B2 · Microcircuit device including a near-field communication antenna circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,540,162 B2 - Document ID: US8540162B2 - Status: Granted - Kind: B2 - Application number: 13/197,686 - Filed: 2011-08-03 - Published: 2012-02-16 - Granted: 2013-09-24 - Earliest claimed: 2010-08-03 - Assignees: Oberthur Technologies - Applicants: Loïc Le Garrec; Agnès Duval - Inventors: Loïc Le Garrec; Agnès Duval - Web page: https://patentgrep.com/patent/US8540162B2 ## CPC - G06K 19/07749: {the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card} - G06K 7/10178: {including auxiliary means for focusing, repeating or boosting the electromagnetic interrogation field (comparable booster antennas integrated on the record carrier itself G06K19/07794)} - G06K 19/0726: {the arrangement including a circuit for tuning the resonance frequency of an antenna on the record carrier} - G06K 19/07767: {the first and second communication means being two different antennas types, e.g. dipole and coil type, or two antennas of the same kind but operating at different frequencies} - G06K 19/07779: {the inductive antenna being a coil} - G06K 19/07783: {the coil being planar} - G06K 19/07784: {the inductive antenna consisting of a plurality of coils stacked on top of one another} - G06K 19/07794: {the record carrier comprising a booster or auxiliary antenna in addition to the antenna connected directly to the integrated circuit} - G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS ## Abstract This circuit (32) comprises a first antenna (34) connected to the microcircuit (14) and capable of supplying power to the microcircuit (14) by electromagnetic coupling with an external terminal and a second antenna (36) electromagnetically coupled to the first antenna (34) while remaining electrically isolated from the latter. In addition, the first (34) and second (36) antennas consist respectively of first and second windings having opposite winding directions as defined from the same observation point. ## Claims ### Claim 1 A microcircuit device comprising a near-field communication antenna circuit comprising: an antenna connected to a microcircuit of the device and configured to supply to the microcircuit power provided to the antenna by an external terminal at a supply frequency of the microcircuit; and a coupled coil inductively coupled with a coil of the antenna while still remaining electrically isolated from the antenna, the coil of the antenna and the coupled coil having opposite winding directions as defined from the same observation point. ### Claim 2 (depends on 1) The device according to claim 1, wherein the coil of the antenna and the coupled coil are arranged substantially facing each other in distinct but substantially parallel planes. ### Claim 3 (depends on 1) The device according to claim 1, wherein the antenna and the microcircuit comprise a circuit oscillating at a first resonance frequency and the coupled coil comprises a second circuit oscillating at a second resonance frequency distinct from the first frequency such that the first resonance frequency is independent of the coupled coil. ### Claim 4 (depends on 3) The device according to claim 3, wherein the first resonance frequency is substantially equal to the resonance frequency of the antenna circuit. ### Claim 5 (depends on 3) The device according to claim 3, wherein the second resonance frequency is greater than or equal to double the first resonance frequency. ### Claim 6 (depends on 3) The device according to claim 3, wherein the first resonance frequency is comprised between 10 and 20 MHz. ### Claim 7 (depends on 3) The device according to claim 3, wherein the second resonance frequency is greater than or equal to 30 MHz. ### Claim 8 (depends on 3) The device according to claim 3, wherein the second frequency is equal to 50 MHz. ### Claim 9 (depends on 1) The device according to claim 1, wherein the coupled coil is open, two ends of the coupled coil being separated by an electrically insulating material. ### Claim 10 (depends on 1) The device according to claim 1, wherein the coupled coil is closed on a capacitive element. ### Claim 11 (depends on 10) The device according to claim 10, wherein the capacitive element comprises two metal plates separated from one another by an electrically insulating material. ### Claim 12 (depends on 11) The device according to claim 11, wherein the electrically insulating material is a material of a substrate of the coupled coil. ### Claim 13 (depends on 1) The device according to claim 1, wherein the coil of the antenna and the coupled coil have the same number of electrically conductive turns. ### Claim 14 (depends on 1) The device according to claim 1, wherein the antenna circuit is borne on a substrate delimiting two opposite faces; one face of the two opposite faces bears the antenna, and another face of the two opposite faces bears the coupled coil. ### Claim 15 (depends on 1) The device according to claim 1, further comprising: a body provided with a cavity for receiving a microcircuit module, the module comprising a substrate bearing the microcircuit and the antenna circuit. ### Claim 16 (depends on 1) The device according to claim 1, wherein the device is a microcircuit card having outside dimensions which are delimited by its body. ### Claim 17 (depends on 16) The device according to claim 16, wherein said microcircuit card is in an ID-000 format.