Equivalent circuit analysis of inductively coupled NFC antennas

Wang, Meng-Shuang; Guo, Yong‐Xin; Wu, Wen

doi:10.1109/aps.2014.6905096

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…The relatively high values of R t and R r could be caused by the loss due to the thin traces [15] and the lumped components. The value of M is derived from the simulated S-parameters of the NFC system [13,29]. The calculated values of M at different d are shown in Fig.…”

Section: Near-field Performancementioning

confidence: 99%

“…In NFC systems, a smaller separation distance can enhance the mutual coupling. Nonetheless, once the mutual coupling coefficient exceeds a critically coupled value, the over-coupling effect occurs, which will result in resonant frequency splitting and deteriorate the transmission efficiency significantly [13][14][15]. To overcome this issue, several methods have been proposed, including the automatic frequency tuning method [14], the reverse loop method [15] and the optimisation of matching network [16].…”

Section: Introductionmentioning

confidence: 99%

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Near‐field and far‐field shared structure for NFC and CNSS applications

Wang

Guo²,

2017

IET Microwaves, Antennas & Propagation

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This study presents a shared structure for both near‐ and far‐field operations using magnetic resonance coupling and electromagnetic radiation. The proposed structure is composed of a rectangular loop and two monopoles. A duplexer is designed to route the near‐ and far‐field signals. For far‐field operation, both dual‐band resonance and dual‐sense circular polarisation required by the compass navigation satellite system (CNSS) are achieved. For near‐field operation, a wireless communication link operating at 13.56 MHz is established. The effect of matching distance on the transmission performances is studied and the optimal matching network is obtained. The proposed design is fabricated and verified experimentally. In the far‐field regime, it can achieve 10 dB impedance bandwidths of 17.2 and 15.8% and 3 dB axial ratio bandwidths of 4.6 and 12.8% and the two CNSS bands are fully covered. In the near‐field regime, an average transmission coefficient of 0.59 is achieved within the operation range of 5–30 mm by the proposed design. The obtained good performance reveals that the proposed shared structure is suitable to be applied in handheld devices for near‐field communication and CNSS applications.

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Section: Near-field Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Near‐field and far‐field shared structure for NFC and CNSS applications

Wang

Guo²,

2017

IET Microwaves, Antennas & Propagation

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“…The mutual inductance on NFC antennas is another popular research area, which affects impedance matching and transmission efficiency for NFC applications. Some studies [ 50 , 51 ] provide Equivalent Circuit Analysis for inductively coupled NFC antennas to examine the mutual inductance parameters.…”

Section: Nfc Technology Essentialsmentioning

confidence: 99%

The Survey on Near Field Communication

Çoşkun

Özdenizci

2015

Sensors

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Near Field Communication (NFC) is an emerging short-range wireless communication technology that offers great and varied promise in services such as payment, ticketing, gaming, crowd sourcing, voting, navigation, and many others. NFC technology enables the integration of services from a wide range of applications into one single smartphone. NFC technology has emerged recently, and consequently not much academic data are available yet, although the number of academic research studies carried out in the past two years has already surpassed the total number of the prior works combined. This paper presents the concept of NFC technology in a holistic approach from different perspectives, including hardware improvement and optimization, communication essentials and standards, applications, secure elements, privacy and security, usability analysis, and ecosystem and business issues. Further research opportunities in terms of the academic and business points of view are also explored and discussed at the end of each section. This comprehensive survey will be a valuable guide for researchers and academicians, as well as for business in the NFC technology and ecosystem.

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