用于土壤湿度监测的无芯片RFID传感器设计  

Design of a chipless RFID sensor for soil moisture monitoring

作　　者：邰正一 马润波[1] Tai Zhengyi;Ma Runbo(School of Physics and Electronic Engineering,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学物理电子工程学院,山西太原030006

出　　处：《电子技术应用》2024年第5期84-89,共6页Application of Electronic Technique

摘　　要：为提高土壤湿度传感器的灵活性和可靠性,设计了一种低成本的无芯片RFID传感器,用于无线监测土壤湿度。该传感器由3个互补开口环谐振器(CSRR)以及2个正交放置的宽带圆形微带贴片天线构成。其中两个相同尺寸的CSRR间距较近,容易产生谐振器间耦合,使得高湿度土壤下的谐振频率变化更加明显,另外作为参考谐振器的CSRR则用以消除环境条件的影响,提高测量的可靠性。两个微带贴片天线用于收发信号,实现无线传感功能。分别研究了采用单、双CSRR结构下该传感器的雷达散射截面(RCS),确定了土壤湿度与谐振频率差值之间的线性关系,通过实测进一步证实了这种关系。实验结果表明,该传感器在0%~12%的土壤湿度下具有18.2 MHz/%θ的灵敏度。To improve the flexibility and reliability of soil moisture sensors,a low-cost chipless RFID sensor is designed for wireless monitoring of soil moisture.The sensor consists of three Complementary Split Ring Resonators(CSRR)and two orthogonal broadband circular microstrip patch antennas.Two CSRRs of the same size are closely spaced,which can easily cause coupling between resonators,resulting in more significant changes in resonant frequency in high moisture soil.In addition,the CSRR as a reference resonator is used to eliminate the influence of environmental conditions and improve the reliability of measurement.Two microstrip patch antennas are used for transmitting and receiving signals,achieving wireless sensing function.The Radar Cross Section(RCS)of the sensor with single and double CSRR structures is studied,establishing a linear relationship between soil moisture and the difference in resonance frequency.This relationship has been further confirmed through actual measurements.The experimental results show that the sensor has a sensitivity of 18.2 MHz/%θat soil moisture ranging from 0%to 12%.

关 键 词：无芯片RFID传感器 土壤湿度 互补开口环谐振器 微带贴片天线 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]