A Multifunctional Microwave Filter/Sensor Component Using a Split Ring Resonator Loaded Transmission Line

This research is focused on the design and realization of a microwave component with multifunctional filter/sensor operation using a resonator-loaded transmission line (TL). It is shown that while the structure acts as a bandstop filter, the phase of the reflection coefficient from the loading resonator(s) on a movable layer can be used for displacement sensing, thus allowing for combining filtering with sensing in one device. The proposed multifunctional mechanism is validated through electromagnetic (EM) simulation of the structure. The concept and the performance of the proposed device are further examined through the fabrication and measurement of a multifunctional filter/sensor component based on a microstrip TL loaded with movable split ring resonators (SRRs).