Title :
Metamaterial-Inspired Rotation Sensor With Wide Dynamic Range
Author :
Ebrahimi, Amir ; Withayachumnankul, Withawat ; Al-Sarawi, Said F. ; Abbott, Derek
Author_Institution :
Sch. of Electr. & Electron. Eng., Univ. of Adelaide, Adelaide, SA, Australia
Abstract :
A rotation sensor with a wide dynamic range is designed based on tapered U-shaped resonators. The proposed device is composed of a rounded microstrip transmission line that couples to two meandered resonators that are stacked on top of each other. By rotating the upper resonator, the overlapping area between the two resonators is increased causing a stronger coupling that shifts down the resonance frequency of the device. This frequency shift can be read out in the transmission response from which the rotation angle is determined. The operation principle of the sensor is explained in detail by using a circuit model. A sensor prototype is designed for the microwave frequency range and an experiment is presented for validating the proposed sensing approach. This sensing device is well suited for further miniaturization using microelectromechanical systems technology.
Keywords :
angular measurement; coupled transmission lines; microstrip lines; microstrip resonators; microwave detectors; microwave metamaterials; rotation measurement; equivalent circuit model; meandered resonator coupling; metamaterial-inspired rotation angle sensor; microelectromechanical system technology; microwave frequency sensor; resonance frequency; rounded microstrip transmission line; tapered U-shaped resonator; transmission response; Integrated circuit modeling; Microstrip resonators; Resonant frequency; Sensitivity; Sensors; Substrates; Metamaterial-inspired sensor; rotation sensor; split-ring resonator;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2014.2313625
