Abstract
The flexible near-field communication (NFC) antennas integrated with Fe3O4/ethylene-vinyl acetate copolymer (EVA) magnetic films were presented, and the influence of the magnetic composite films on the performance and miniaturization capability of the NFC antennas was investigated. Theoretical analysis and experimental results show that the integration of the magnetic composite films is conducive to the miniaturization of the NFC antennas. However, the pattern design of the integrated magnetic film is very important to improve the communication performance of NFC antenna. When magnetic film covers whole antenna, the inductance (L) and quality factor (Q) of the NFC antenna at 13MHz are increased by 60% and 5% respectively, but the communication distance of NFC system is decreased by 70%. When the magnetic film is located at the center of the antenna, the L value, Q value and communication distance of the NFC antenna are increased by 16.5%, 15.5% and 20% respectively. It can be seen that the application of the integrated magnetic film with optimized pattern to the NFC antenna can not only reduce the size of the antenna, but also improve the overall performance of the antenna.
Highlights
Wearable antenna is a critical element in wearable systems, which enables wearable systems to communicate wirelessly with other electronic devices
The purpose of this paper is to investigate the feasibility of integrating flexible magnetic composite film into wearable near-field communication (NFC) antenna and analyze the relationship between magnetic film pattern and the electrical performance of the NFC antenna
To investigate the feasibility of integrating flexible magnetic film into wearable NFC antenna and analyze the relationship between magnetic film pattern and the electrical performance of the NFC antenna, a class of flexible NFC antennas integrated with Fe3O4/ethylene-vinyl acetate copolymer (EVA) magnetic composite films was fabricated
Summary
Wearable antenna is a critical element in wearable systems, which enables wearable systems to communicate wirelessly with other electronic devices. With the rapid development of wearable systems,[1,2] there is an increasing interest in wearable antennas. NFC antenna provides a very secure way of wireless communication by using near field inductive coupling. NFC antenna is widely used and gradually becomes the standard configuration of mobile phones. It is convenient to combine the NFC antenna with wearable electronics. The research on the application of NFC antenna in wearable system can further promote the development of wearable technology
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