公开(公告)号：US20180165569A1

公开(公告)日：2018-06-14

申请号：US15894440

申请日：2018-02-12

Applicant: STMicroelectronics International N.V.

Inventor： Vinko Kunc ,  Anton Stern ,  Kosta Kovacic ,  Albin Pevec ,  Maksimiljan Stiglic

IPC: G06K19/077 ,  G06K19/07

CPC classification number: G06K19/07773 ,  G06K19/0715 ,  G06K19/07749 ,  G06K19/0775

Abstract: An RFID transponder device has antenna terminals for coupling an antenna system to the device. A transmitter and a receiver are coupled to the antenna terminals. The device has at least one damping resistance connected to at least one of the antenna terminals. The at least one damping resistance is connected, depending on a voltage swing at the antenna terminals during a transmission burst period, either together with a serially connected switch in parallel to the antenna terminals that are coupled to the receiver, or together with a parallel connected switch between one of the antenna terminals and a terminal of the transmitter. A damping control is configured to activate the at least one damping resistance during a damping period after the transmission burst period by controlling the respective switch.

公开(公告)号：US09946966B2

公开(公告)日：2018-04-17

申请号：US14426146

申请日：2013-09-04

Applicant: STMicroelectronics International N.V.

Inventor： Vinko Kunc ,  Maksimilijan Stiglic ,  Kosta Kovacic

IPC: G06K19/06 ,  G06K19/07 ,  H01Q1/22

CPC classification number: G06K19/0726 ,  H01Q1/2208

Abstract: Tuning an antenna circuit of an actively transmitting tag to a frequency of an interrogator carrier signal after the tag was inserted into a host device is accomplished by detecting presence of the interrogator carrier signal at a location of the actively transmitting tag and hereafter setting capacitances of capacitors and/or inductances of coils comprised in said antenna circuit in a way that resonance of said antenna circuit is established while the antenna circuit is excited by a magnetic field of said interrogator carrier signal. This allows automatic tuning of an antenna circuit of an actively transmitting tag after it was inserted together with a miniature card into a host device, such as a mobile telephone, personal digital assistant, tablet PC and similar devices.

公开(公告)号：US09928458B2

公开(公告)日：2018-03-27

申请号：US15397559

申请日：2017-01-03

Applicant: STMicroelectronics International N.V.

Inventor： Vinko Kunc ,  Anton Stern ,  Kosta Kovacic ,  Albin Pevec ,  Maksimiljan Stiglic

IPC: G06K19/06 ,  G06K19/077 ,  G06K19/07

CPC classification number: G06K19/07773 ,  G06K19/0715 ,  G06K19/07749 ,  G06K19/0775

Abstract: An RFID transponder device has antenna terminals for coupling an antenna system to the device. A transmitter and a receiver are coupled to the antenna terminals. The device has at least one damping resistance connected to at least one of the antenna terminals. The at least one damping resistance is connected, depending on a voltage swing at the antenna terminals during a transmission burst period, either together with a serially connected switch in parallel to the antenna terminals that are coupled to the receiver, or together with a parallel connected switch between one of the antenna terminals and a terminal of the transmitter. A damping control is configured to activate the at least one damping resistance during a damping period after the transmission burst period by controlling the respective switch.