Reduction of the dependence of the frequency of a passive resonant surface acoustic wave sensor with magnetic coupling on the angle of rotation of the shaft

The effect of connecting a rotating ring joint on the frequency of a passive contactless surface acoustic wave resonant sensor with the combined use of a model based on connected transmission lines and its equivalent electric circuit with lumped elements is analyzed. The considerable reduction in the dependence of the frequency of the sensor on the angle of rotation of the shaft and the reduction in the error of measurements carried out on the shaft when both rotating ring joints are completely symmetrically connected are demonstrated.