摘要
Abstract
To effectively incorporate communication sensing terminals into natural conditions with a focus on minimizing weight,size,and power consumption,a novel environmental sensing device in the shape of a maple leaf is proposed.This device utilizes backscatter communication technology.Drawing inspiration from the energy supply mechanism of plants through leaf stems,the terminal antenna,which is designed to mimic a maple leaf,interacts with the reader and is energized by a coaxial cable crafted to resemble a leaf stem.The antenna̓s general form and dimensions closely mimic those of authentic maple leaves and are inconspicuously situated on the top of the tree.It is connected to the terminal circuit through a coaxial transmission line to gather environmental data.The circuit measures approximately 13.0 mm×13.0 mm×0.8 mm in size,allowing for effective concealment within trees.The dimensions of the antenna are approximately 48.0 mm×38.4 mm,and it is connected via an 8 mm-long coaxial cable.This configuration mimics the size of authentic maple leaves and stems.Given that the device does not require autonomous generation of wireless signals for communication,its total power consumption is approximately 50 μW.The total weight of the equipment is around 1.65 g,and it is characterized by compact size,light weight,low power consumption,and independence from batteries.Utilizing the single-frequency radio frequency(RF)signal of the transmitter as a local oscillator,a low-power microcontroller acquires temperature and humidity sensor data in the form of the baseband signal.The signal is modulated through RF switch control utilizing on-off keying(OOK),then dispersed,and subsequently demodulated by the receiver to retrieve environmental data.Solar panels mounted on the branches of the maple tree supply power to the microcontroller and sensors of the terminal circuit.The efficacy of the environmental sensing device is validated through a comprehensive debugging experiment that encompasses the transmitter,receiver,and a camouflaged tree leaf.关键词
环境感知设备/伪装树叶/背向散射通信/免电池技术/OOK调制Key words
environment sensing device/camouflage leaf/backscatter communication/battery-free technology/OOK modulation分类
信息技术与安全科学
