# US 2017/0288733 A1 · Method of Connecting One or More Contactless Components to a Single Antenna, and Corresponding System > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0288733 A1 - Document ID: US20170288733A1 - Status: Published application - Kind: A1 - Application number: 15/629,525 - Filed: 2017-06-21 - Published: 2017-10-05 - Earliest claimed: 2011-02-04 - Assignees: STMicroelectronics (Rousset) SAS - Applicants: STMicroelectronics (Rousset) SAS - Inventors: Pierre Rizzo; Alexandre Tramoni - Web page: https://patentgrep.com/patent/US20170288733A1 ## CPC - H03H 7/40: Automatic matching of load impedance to source impedance - H04B 5/22: Capacitive coupling - H04B 5/26: using coils - H04W 76/14: Direct-mode setup - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract An electronic device includes an antenna, an irremovable component, a removable component, an impedance matching circuit, and a controller. The impedance matching circuit is arranged in a first configuration corresponding to the removable component connected to the irremovable component. The impedance matching circuit has a first capacitor, a second capacitor, and a third capacitor. The controller is configured to arrange the impedance matching circuit in a second configuration corresponding to the removable component being disconnected from the irremovable component. ## Claims ### Claim 1 An electronic device comprising: an antenna; an irremovable component; a removable component; an impedance matching circuit arranged in a first configuration corresponding to the removable component coupled to the irremovable component, the impedance matching circuit comprising a first capacitor, a second capacitor, and a third capacitor; and a controller configured to arrange the impedance matching circuit in a second configuration corresponding to the removable component decoupled from the irremovable component. ### Claim 2 (depends on 1) The electronic device of claim 1, wherein the second and third capacitors are deactivated in the first configuration. ### Claim 3 (depends on 2) The electronic device of claim 2, further comprising a MOS transistor configured to deactivate the second and third capacitors. ### Claim 4 (depends on 3) The electronic device of claim 3, wherein the controller is further configured to transmit a control signal to the MOS transistor to deactivate the second and third capacitors. ### Claim 5 (depends on 1) The electronic device of claim 1, wherein a resonant circuit between the removable component and the antenna in the first configuration has a resonant frequency compatible with a carrier frequency. ### Claim 6 (depends on 1) The electronic device of claim 1, wherein a resonant circuit between the irremovable component and the antenna in the second configuration has a resonant frequency compatible with a carrier frequency. ### Claim 7 (depends on 1) The electronic device of claim 1, wherein the irremovable component comprises a Near Field Communication (NFC) compatible component. ### Claim 8 (depends on 1) The electronic device of claim 1, wherein the antenna comprises an NFC antenna. ### Claim 9 A method of configuring an impedance matching circuit, the method comprising: configuring the impedance matching circuit in a first configuration corresponding to a removable component coupled to an irremovable component, wherein the first configuration a first capacitor is active, a second capacitor is deactivated, and a third capacitor is deactivated in the impedance matching circuit; and configuring the impedance matching circuit in a second configuration in accordance with a decoupling of the removable component from the irremovable component, wherein the second configuration the first capacitor, the second capacitor, and the third capacitor are active in the impedance matching circuit. ### Claim 10 (depends on 9) The method of claim 9, wherein the irremovable component is configured in a card mode. ### Claim 11 (depends on 9) The method of claim 9, wherein the configuring the impedance matching circuit in the second configuration comprises: transmitting a control signal to a first MOS transistor to activate the second capacitor; and transmitting the control signal to a second MOS transistor to activate the third capacitor. ### Claim 12 (depends on 9) The method of claim 9, wherein the configuring the impedance matching circuit in the second configuration comprises transmitting a control signal from a controller to a MOS transistor to activate the second capacitor and third capacitor. ### Claim 13 (depends on 9) The method of claim 9, further comprising: configuring a resonant circuit between the removable component and an antenna having a resonant frequency compatible with a carrier frequency; and configuring a resonant circuit between the irremovable component and the antenna having a resonant frequency compatible with a carrier frequency. ### Claim 14 An electronic device comprising: a first antenna comprising a contactless communication protocol compatible component; an irremovable component coupled to the first antenna in a first configuration; a removable component coupled to the first antenna; an impedance matching circuit coupled to the first antenna comprising a first capacitor, a second capacitor, and a third capacitor, wherein the second capacitor and the third capacitor are deactivated when the irremovable component is coupled to the first antenna in the first configuration; and a controller coupled to the impedance matching circuit configured to activate the second capacitor and the third capacitor when the removable component is decoupled from the first antenna in a second configuration. ### Claim 15 (depends on 14) The electronic device of claim 14, further comprising a second antenna comprising a cellular mobile telephone compatible component. ### Claim 16 (depends on 14) The electronic device of claim 14, wherein the controller comprises a MOS transistor configured to receive a controlling signal to deactivate the second and third capacitor. ### Claim 17 (depends on 14) The electronic device of claim 14, wherein the irremovable component comprises a Near Field Communication (NFC) compatible component. ### Claim 18 (depends on 14) The electronic device of claim 14, wherein the first antenna comprises an NFC antenna. ### Claim 19 (depends on 14) The electronic device of claim 14, wherein the controller comprises: a first MOS transistor configured to deactivate the second capacitor; and a second MOS transistor configured to deactivate the third capacitor. ### Claim 20 (depends on 14) The electronic device of claim 14, wherein a resonant circuit between the removable component and the antenna in the first configuration has a resonant frequency compatible with a carrier frequency.