Simulation Analysis of Dual Band Microstrip Antenna Strain Sensor Based on RFID

In this paper, a RFID antenna for structural health detection (SHM) is studied. The antenna is a dual frequency resonant antenna. In the simulation, the law of the strain of the dielectric plate is generated by the Poisson coefficient of the dielectric plate. The change in the shape of the antenna affects the electric current distribution on the antenna patch, causing the resonant frequency to drift, and further determining the nature of the strain through the return loss parameter. The simulation results show that the first resonant frequency of the microstrip antenna can be used to detect the direction of strain, and the second resonant frequency is used to detect the magnitude of strain. Compared with other products of the same type, the requirements of structural strain measurement can be met. It laid a theoretical foundation for experimental research.