| Wireless environmental monitoring system can realize large-range and long-term continuous environmental monitoring,so it is widely used in facility condition monitoring,environmental monitoring and other fields.However,wireless environment monitoring often has higher requirements for related monitoring technology due to the characteristics of its complex detection environment.More applicable methods need to be developed to contribute to environmental monitoring and make the wireless monitoring system more stable.In this paper,a new type of soil water content monitoring and metal crack monitoring antenna sensor is proposed,which provides a new technical idea for environmental monitoring methods.The main work of the thesis is as follows:（1）To improve the sensitivity of the antenna sensor for detecting soil water content.A novel metamaterial structure is designed and its function of improving sensitivity is verified.Loading the EBG array above the antenna can improve the sensitivity of the sensor by 19.2%and 23.4%when the soil water content is10%～29%and 30%～44%,respectively.Moreover,the sensitivity of the antenna sensor is also improved by sputtering a 60-nm-thick SiO2film on the antenna surface.SiO2film is sputtered on the antenna patch,which can improve the sensitivity of the sensor by 30.3%and 57.9%when the soil water content is 10%～29%and 30%～44%,respectively.（2）To achieve the goal of miniaturization and compactness of metal crack monitoring technology,this study designs an antenna sensor with a three-layer dielectric substrate structure.The sensor can measure the crack depth inside the alumina and transmit it wirelessly,the measurement range is 1～16mm,and a new metamaterial structure is designed,which verifies its function in improving sensitivity. |
