Highly Sensitive CSRR-Based Angular Displacement Sensor with Extended Wide Dynamic Range

This paper presents a novel high-sensitive microwave angular displacement sensor with an extended wide dynamic range. The proposed sensor is implemented using microstrip technology and consists of a pair of stacked triple complementary split-ring resonators (TCSRRs) – a stator and a rotor – positioned above each other. The key innovation involves orienting the gaps of the third rings in orthogonal directions in the two TCSRRs, introducing intentional structural asymmetry that enhances electrical field non-uniformity and improves the dynamic range. As the rotor executes rotation, a noticeable transmission zero shift is observed. The sensor achieves a wide dynamic range from 0° to 200°, with a sensitivity of 19.85 MHz/°, and exhibits an ultra-sensitive region between 100° and 200°, where the sensitivity reaches 31.68 MHz/°.