Wearable Antenna And Research On Interaction With Human Body

In recent years,with the development of wireless communication technology and the continuous improvement of people's quality of life requirements,the human body center network has become an important part of the fourth generation of mobile communication,directly promoting the emergence of antenna design and new technology.In the study of human center network antennas,wearable flexible antennas are one of the important research directions.It is of great research significance to study wearable flexible antennas with miniaturization,wide frequency band and multi-purpose characteristics,and to study antennas and human bodies.At the same time,studying the interaction between the antenna and the human body is also an important issue in the study of wearable antennas.This paper will study the interaction between the wearable antenna and the human body and the antenna.The main research contents are as follows:1.Understand the development status of wearable antennas at home and abroad,clarify the development trend and requirements of wearable antennas,master the theoretical basis and design principles of antennas,explain the feeding methods and analysis methods of antennas,and introduce the electromagnetic characteristics of human tissues and the measurement standards of antenna radiation.Summary of dielectric substrate materials and radiation patch materials commonly used in wearable antenna designs.2.This paper introduces the theory of ultra-wideband and planar monopoles,and designs an ultra-wideband planar monopole antenna with wearable properties based on PDMS flexible dielectric material and copper foil.The antenna has a frequency range of 2.7 to 12.3 GHz below-10 dB,covers the working range of the ultra-wideband antenna,and has good radiation characteristics.According to the implementation method and principle of the antenna band-stop characteristic,the wearable ultra-wideband monopole antenna realizes band-stop characteristics in the WiMAX and WLAN bands,respectively,and prevents its influence on the ultra-wideband communication system.By establishing a human tissue model,theinfluence of the human body and the antenna on the antenna at different distances is studied to verify the feasibility of the wearable antenna.3.Based on the advantages of the coplanar waveguide structure,a wearable antenna for coplanar waveguide feeding in the 2.45 GHz ISM band is designed based on the PI flexible dielectric substrate.Explain the design of the antenna structure and study the influence of different parameter sizes of the antenna on the antenna performance.The center frequencies of the antenna simulation and measurement are2.45 GHz and 2.43 GHz,respectively,and the return loss is-49 dB and-41 dB,respectively,and the radiation pattern has good consistency.Study the influence of bending on the performance of the antenna,analyze the influence of different parts of the human body on the antenna,and study the radiation degree of the antenna to the human body according to the SAR value of the human tissue model and the antenna at different distances,thereby further verifying the wearability of the antenna.In order to comply with the rapid development of wireless communication systems,a dual-band coplanar waveguide-fed wearable antenna operating at 2.45 GHz and 5.8GHz was designed,and the simulation and measured results were compared and analyzed.