Patent · US Active

NFC or RFID device RF detuning detection and driver output power regulation

US10164600B2 · kind B2 · utility

6Cited by

16References

19Claims

0Family size

Assignee

NXP B.V. · NL

Inventors

Leonhard Kormann · Gratwein-Straßengel, AT
Markus Wobak · Graz, AT
Fred George Nunziata · Graz, AT

Key dates

Filing date	Oct 12, 2015
Grant date	Dec 25, 2018
Priority date	—
Expiry date	Oct 12, 2035

Classification

Technology area (CPC H)Electricity
CPC primaryH04B5/77
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

A near field communication (NFC) or Radio Frequency Identification (RFID) reader device for contact-less communication includes a transmitter block connected to an antenna via a matching circuitry. An electromagnetic carrier signal and modulated data information are emitted via this main antenna. Any secondary object brought into the vicinity of the main antenna influences the primary resonant circuit resulting in a load change seen by the transmitter. This detuning can cause increased power consumption, RF (Radio Frequency) standard incompliance, and device damage. The present disclosure describes devices and methods on how to detect detuning and how to regulate the transmitter's output.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.