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.