| Body area network is a human-centered communication network composed of various terminals,sensors,networking devices and other communication elements placed around the human body,on the body surface and in the body.Through body area network,the human body can be transformed into a part of the communication network,and communicate and interact with other data networks.It has broad application prospects in many fields such as medical health,personal entertainment,disaster relief and individual soldier system.In the application of body area network,it is necessary to realize the miniaturization of equipment to ensure the convenience of users,to realize the multi-frequency working characteristics of equipment to meet the needs of multi-mode work of body area network system,and to develop independent energy supply technology to reduce carbon emissions.In response to these needs,this paper has done extensive research on miniaturized implantable antennas,dual-band wearable antennas and flexible substrate rectifier circuits.The research work mainly includes:(1)Research on ISM band implantable capsule antenna.Aiming at the design requirements of implantable temperature detection capsule antenna,a miniaturized implantable capsule antenna working in ISM band is designed.The antenna plane layout structure makes full use of the capsule hemisphere space,reduces the interference of the electronic components inside the capsule to the antenna signal,and reduces the antenna volume by folding the antenna radiator.By adjusting and optimizing the main direct parameters of the antenna,it works in the corresponding frequency band.The antenna has strong robustness when facing different human tissue environments.The simulation and measurement results show that the antenna resonance is at 2.45 GHz,covering the ISM frequency band,and has a good radiation gain pattern,which meets the safety requirements of implanted devices.It has certain application prospects in body area network implanted devices.(2)Research on UHF RFID and WLAN band wearable glove antenna.Aiming at the problem of data reading and data networking in wearable smart glove antenna,a miniaturized wearable antenna working in UHF RFID and WLAN dual-band is designed.ACS waveguide feeding technology is used to reduce the grounding area of the antenna,and the dual-frequency operation is realized by folding the antenna radiator to further reduce the antenna area.The simulated and measured results show that the antenna covers 900 MHz and 2.40 GHz bands,and realizes dual-band communication between UHF RFID and WLAN.When the antenna is attached to gloves of different materials and different wearer carriers,the antenna has strong robustness.The antenna has simple design,stable performance,stable radiation direction and less harm to human body.It has certain application prospects in the field of smart gloves in body area network.(3)Research on wearable flexible rectifier circuit in ISM band.Aiming at the problem that body area network equipment cannot work for a long time and wear conformal,a flexible rectifier circuit working in ISM band is designed.The circuit consists of two HSMS-285 C rectifier diodes,two 100 p F capacitors and a 1000 Ω load resistance.The flexible EPDM material is used.The T-type structure matching network ensures the impedance matching between the input end and the rectifier part.The bridge rectifier circuit structure ensures a higher output voltage and realizes 900 MHz RF energy collection.The simulation and experimental results show that the circuit can generate different voltage outputs in different low input power ranges.When the actual input power is 10.0 d Bm,the maximum output voltage is 2.039 V and the maximum conversion efficiency is 55.5 %. |
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