Rotation sensing based on the symmetry properties of an open-ended microstrip line loaded with a split ring resonator

This paper proposes the principle for rotation sensing based on an open-ended microstrip line loaded with a split ring resonator (SRR). It is shown that the variations in the depth of the resonance notch in the reflection coefficient of the structure can be used to sense the rotation angle of the SRR. This effect arises from the rotation-induced break of symmetry for the geometry. The proposed sensor benefits from a compact size and a higher dynamic range compared to previously published rotation sensors based on depth of notch. The sensor also benefits from immunity to the environmental changes such as temperature variations.