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

作者：Wang, Meng-Shuang; Guo, Yong-Xin^*; Wu, Wen

来源：IET Microwaves Antennas & Propagation, 2017, 11(15): 2116-2123.

DOI：10.1049/iet-map.2017.0049

• near-field communication
• satellite navigation
• monopole antennas
• magnetic resonance
• electromagnetic waves
• electromagnetic wave polarisation
• satellite antennas
• near-field shared structure
• far-field shared structure
• NFC application
• CNSS application
• near-field communication
• compass navigation satellite system
• near-field operation
• far-field operation
• magnetic resonance coupling
• electromagnetic radiation
• rectangular loop
• monopoles
• duplexer
• near-field signals
• far-field signals

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 13.56MHz 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 10dB impedance bandwidths of 17.2 and 15.8% and 3dB 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 5-30mm 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.

• 出版日期2017-12-10
• 单位南京理工大学