NFC Loop Antenna in Conjunction With the Lower Section of a Metal Cover

This letter proposes a near-field communication (NFC) antenna for smartphones with a metal cover that includes an embedded narrow slot, therein splitting the metal cover into upper and lower sections. The proposed NFC antenna is a simple loop structure that is formed by incorporating a three-dimensi...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2017-01, Vol.16, p.3131-3134
Main Authors: Zhu, Jia-Qi, Ban, Yong-Ling, Xu, Rui-Min, Sim, Chow-Yen-Desmond, Yu, Zhe-Feng
Format: Article
Language:English
Subjects:
Coupling
Couplings
Directive antennas
Eddy current
Eddy currents
Europay
Inductive coupling
Loop antennas
MasterCard and Visa (EMV)
metal cover
Metals
narrow slot
Near field communication
Slot antennas
Smartphones
Strips
three-dimensional (3-D) coupling strip
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Summary:This letter proposes a near-field communication (NFC) antenna for smartphones with a metal cover that includes an embedded narrow slot, therein splitting the metal cover into upper and lower sections. The proposed NFC antenna is a simple loop structure that is formed by incorporating a three-dimensional coupling strip with the upper edge of the metal cover in the lower section. Because this antenna structure can substantially reduce the eddy current, excellent inductive coupling can be achieved through the clearance zone of the narrow slot. The proposed NFC antenna is relatively thin and achieves excellent performance in the read/write mode. Furthermore, in the card emulation mode verified by Europay, MasterCard, and Visa test, it even surpasses the performance of certain other NFC antennas in smartphones with non-metal covers.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2017.2764493