Structure Design And Performance Study Of NFC Antenna

NFC(Near Field Communication)technology is rapidly evolving.As multi-style,multipurpose NFC applications continue to emerge,NFC technology has increasingly become an integral part of our lives.NFC technology has formed a set of international standards in the communication protocol.However,there is no uniform standard in the antenna part.In actual design,NFC antennas usually need to be designed according to the shape and size of the product.The traditional NFC antennas have great limitations and their performance is poor.In this paper,we study the above problems and design two new types of NFC antennas to overcome the limitations of traditional NFC antennas and improve the performance of NFC antennas.This article focuses on the NFC antenna structure optimization and performance improvement issues in-depth study,the main work is as follows:First of all,in order to study the magnetic field distribution of rectangular coil,the paper uses Matlab and HFSS two softwares to simulate,the formula is derived using Matlab simulation,and then through the HFSS software simulation to verify the Matlab simulation results correctness,and then get the rectangular coil magnetic field distribution happening.Secondly,in order to improve the flexibility and performance of the NFC antenna,this paper designs a dual-cell structure NFC antenna and a triple-cell structure NFC antenna.The NFC antenna designed in this paper is consistent with the traditional single-cell NFC antenna in terms of size,material and simulation environment.Based on the theoretical and simulation analysis,the design basis and the structural characteristics of dual-antenna antenna and tripleantenna antenna,the influence of the structure parameters of the NFC antenna on the antenna performance is verified.And in the antenna performance with traditional single-hole NFC antenna comprehensive comparative analysis.Thirdly,in order to maximize the output power of NFC antenna,this paper uses two kinds of matching circuits,namely series resistance matching circuit and parallel resistance matching circuit.Taking the three-cell antenna as a reference,the HFSS simulation analyzes the performance of two matching circuits for antenna performance influence,and then get the best matching circuit.Finally,in order to explore the NFC antenna near-field coupling performance,this paper simulates the coupling performance of single-cell NFC antenna,dual-cell NFC antenna and triple-cell NFC antenna respectively.According to the performance of different NFC antennas,further analysis was done to find the NFC antenna for mobile devices.