Finite Element Simulation of Impedance Measurement Effects of NFC Antennas

Author

Bauernfeind, Thomas ; Preis, Kurt ; Renhart, Werner ; Biro, Oszkar ; Gebhart, Michael

Author_Institution

Inst. for Fundamentals & Theor. in Electr. Eng., Graz Univ. of Technol., Graz, Austria

Volume

51

Issue

3

fYear

2015

fDate

Mar-15

Firstpage

1

Lastpage

4

Abstract

In this paper, the problem of connecting the unbalanced measurement setup on the balanced antenna of the near-field communication (NFC) system is addressed. The parameters of the antenna´s equivalent circuit were determined using quasi-static and full-wave vector field finite element simulations. Measurements and simulations are carried out on three different prototypes of 13.56 MHz NFC rectangular four turns antenna printed on FR4 substrate material. The obtained results concerning the RLC equivalent circuit parameters show that a direct connection of the unbalanced measurement devices to the balanced antenna structure impairs the accuracy of the obtained measurement data because of the mode mismatch at the antenna terminals.

Keywords

antennas; finite element analysis; near-field communication; FR4 substrate material; NFC antennas; NFC rectangular; NFC system; RLC equivalent circuit parameters; antenna equivalent circuit; antenna terminals; balanced antenna; balanced antenna structure; finite element simulation; full wave vector field finite element simulations; impedance measurement effects; near field communication; quasistatic simulations; unbalanced measurement devices; unbalanced measurement setup; Antenna measurements; Antennas; Copper; Equivalent circuits; Ferrites; Frequency measurement; Impedance measurement; Equivalent circuit; Galerkin method; impedance measurement; near-field communication (NFC) antenna; unbalanced measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2354982

Filename

7093401