Rfid Tag Magnetic Field

An rfid tag in its most simplistic form is comprised of two parts an antenna for transmitting and receiving signals and an rfid chip or integrated circuit ic which stores the tag s id and other information.

Rfid tag magnetic field.

Rfid tags are affixed to items in order to track them using an rfid reader and antenna. Sketch of magnetic ux around an axial conflguration square loop reader operating near a perfect conducting metal surface with an rfid tag on a magnetic rf isolator pad. Magnetic field cross section square readerantenna inductive. Us7772978b1 us12 263 750 us26375008a us7772978b1 us 7772978 b1 us7772978 b1 us 7772978b1 us 26375008 a us26375008 a us 26375008a us 7772978 b1 us7772978 b1 us 7772978b1 authority us united states prior art keywords rfid components.

Its all about speed of the movement of the rfid tag relative to the magnetic field. Inductively coupled rfid tags were powered by a magnetic field generated by the rfid reader. Originally rfid tags were used to track large items like cows railroad cars and airline luggage that were shipped over long distances. The antenna a coil of the rfid chip and the magnet form a generator.

The little bit of research i ve done hasn t been able to uncover any issues of interference to rfid by magnetic fields except for one paper which studied the effects of magnets in the digestive track of cattle on rfid ear tags and found that some interference did occur in some cases. 24 inductive rfid magnetic flux in rfid systems chapter 4 protection at uhf or microwave frequencies.