Radiated magnetic field of a low-frequency ferrite rod antenna

Author

Stadler, Alexander

Author_Institution

STS Spezial-Transformatoren Stockach GmbH & Co. KG, Stockach, Germany

fYear

2011

fDate

1-3 June 2011

Firstpage

283

Lastpage

288

Abstract

The frequency range below 135kHz is preferred for inductively coupled radio frequency identification (RFID) systems. At low frequency, the magnetic field coupling between reader and transponder can be increased by using a ferrite core transponder antenna. In this paper, the magnetic field pattern of such a device is investigated. A semi-numerical procedure is presented, how to calculate the magnetic fields resulting from coil and core with avoidance of virtual boundaries. Consequently, calculations at short as well as at large distances can be conducted with high accuracy and minimum computational expense. The model is finally verified by measurements and further simulation based on finite element method (FEM).

Keywords

UHF antennas; antenna radiation patterns; ferrite devices; finite element analysis; magnetic fields; radiofrequency identification; transponders; RFID systems; coil; ferrite core transponder antenna; finite element method; inductive coupled radio frequency identification system; low-frequency ferrite rod antenna; magnetic field coupling; magnetic field pattern; radiated magnetic field; reader; transponder; Coils; Ferrites; Magnetic cores; Magnetic fields; Magnetic flux density; Windings;

fLanguage

English

Publisher

ieee

Conference_Titel

Compatibility and Power Electronics (CPE), 2011 7th International Conference-Workshop

Conference_Location

Tallinn

Print_ISBN

978-1-4244-8806-3

Electronic_ISBN

978-1-4244-8805-6

Type

conf

DOI

10.1109/CPE.2011.5942246

Filename

5942246