Method and circuit for tuning an antenna circuit of an actively transmitting tag
US9946966B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 2013 |
| Grant date | Apr 17, 2018 |
| Priority date | — |
| Expiry date | Feb 7, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/2208
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.