Research On Wearable Antenna Of Body Area Network Based On Artificial Magnetic Conductor

Wireless body area network is an important part of the fifth generation of mobile communication,its application scenarios focus on the range of human activities.It is used to monitor the physiological or environmental data of human,and has a broad application prospect in the fields of medical treatment,personal monitoring and military activities.As an important part of the wireless body area network system,wearable antenna's performance determines the stability of the system,meanwhile,taking into account the health impact to human body.Therefore,the research on wearable antenna with low profile and SAR has great significance.In this paper,the artificial magnetic conductor is used to design wearable antenna,the result shows that the profile of antenna and the radiation of antenna to human body is reduced,and the antenna has good working characteristics.The main research content as follows:(1)The coplanar waveguide structure was analyzed.Based on the broadband characteristics of the coplanar waveguide structure,a dual frequency antenna working at2.45 GHz and 5.8GHz is designed by means of slot coupling and branch coupling.The working performance of the Y-axis bending is modeled and analyzed.The results show that the antenna can work in the required frequency band under different deformations.(2)To address the problem of large specific absorption rate value and the interaction between human tissue and antenna performance in the above mentioned antenna.The artificial magnetic conductor structure is used,using the characteristic of in-phase reflection of the artificial magnetic conductor structure,an artificial magnetic conductor structure working in 2.45 GHz and 5.8GHz was designed,and a miniaturized dual-frequency antenna working in same spectrum was designed,and the artificial magnetic conductor structure was loaded under the miniaturized dual-frequency antenna.The results show that the radiation of the antenna to human body is significantly reduced.When the antenna is 10 mm away from the human body surface,the maximum specific absorption ratio of human body is 0.86W/kg,which meets the international standard.The finally designed antenna based on artificial magnetic conductor structure has the characteristics of compactness and low profile,and theantenna has a small frequency deviation when placed on the surface of the human body,which can maintain a stable matching state.