The Shielding-Effectiveness Based Magnetic Field Shielding Theory and Its Application in Mobile Payment Systems

Author

Yejun He ; Jiefeng Ao ; Jie Yang ; Xiaorong Tang

Author_Institution

Shenzhen Key Lab. of Adv. Commun. & Inf. Process., Shenzhen Univ., Shenzhen, China

fYear

2014

fDate

14-17 Sept. 2014

Firstpage

1

Lastpage

5

Abstract

In this paper, we firstly introduce theory of magnetic coupling. Then, the shielding-effectiveness based electromagnetic shielding theory is studied, and the effectiveness of shielding materials to the coupling process is analysed in mobile payment systems. Simulation results show that when the feed frequency is low, plastic and lithium cell cause almost no attenuation to the magnetic field. If a shielding material is common metal, the magnetic field intensity is reduced to 20%-70% of the original. In the low frequency condition, the time-varying magnetic field produced by the transmitting coil is very stable and can resist the external interference. A convenient simulation software to calculate magnetic field coupling with shielding materials is also developed.

Keywords

electromagnetic shielding; mobile radio; radiofrequency interference; electromagnetic shielding; external interference; frequency condition; magnetic coupling; magnetic field intensity; magnetic field shielding; mobile payment systems; shielding effectiveness; shielding materials; time-varying magnetic field; transmitting coil; Coils; Couplings; Magnetic noise; Magnetic shielding; Materials; Mobile handsets;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference (VTC Fall), 2014 IEEE 80th

Conference_Location

Vancouver, BC

Type

conf

DOI

10.1109/VTCFall.2014.6966203

Filename

6966203