Study Of Flexible Antenna Based On Body Area Network And Antenna Sensor

With the continuous development of wireless communication technology,the body area network is studied as an important component of the fourth generation mobile communication(4G).In order to achieve body-area network communication,using flexible electronic technology for antenna design,a new type of antenna with characteristics of flexibility and wearability can be obtained,which has a wide application prospect in medical,military,sports,and other fields.In this paper,we study the flexible wearable antenna and use different technologies to design three types of flexible wearable antennas and apply them to the sensing field.Its main research content can be summarized as:In study of the wearable theories and design methods of the flexible antenna under body area network;we analysis the electromagnetic propagation characteristics of wearable antennas on human tissues and understand the effects of generated radiation of wearable antennas on the human body.Considering the influence of human electromagnetic characteristics on the performance of the antenna,we build a threelayer human tissue model.Then the performance of the antenna under bending of the antenna is studied.The PDMS of the fluid forming technology and the PET flexible microstrip antenna of the inkjet printing are designed respectively.The microcharacteristics of the conductive properties of the two antenna surfaces were respectively characterized,and the return loss and radiation pattern of the antennas were tested.The return loss of PDMS and PET antenna at the center frequency of 2.45 GHz is-27.6 dB and-23.7 dB respectively,and the bandwidth is 2020-2770 MHz,1900-2690 MHz,respectively.The measurements show that the flexible microstrip antennas implement the curved curvature radius sensing while satisfying the ISM bandwidth.Conductive silver fabrics were used to design a flexible stretchable conductive fabric antenna.The measurements showed that the dipole stretchable fabric antenna can achieve tensile stress sensing.We designed a variety of flexible antennas for wearable applications and applied them to the field of sensing by studying the antenna design and sensing theory.The flexible antenna designed in this paper satisfies the basic requirements of wearable,and it is of great significance to the practical application of the flexible antenna.