Electrical engineering

Physics

Microstrip

Permittivity

Resonator

Gene

Engineering

Dielectric

Electric power transmission

Acoustics

Chemistry

Materials science

Sensitivity (control systems)

Electronic engineering

Microwave

Transmission line

Optoelectronics

Biochemistry

Robustness (evolution)

Split-ring resonator

Telecommunications

IEEE Sensors Journal

This paper presents a microwave sensor using a pair of split-ring resonators (SRRs). The sensor is designed by loading a microstrip transmission line by two identical SRRs on its sides. Differential permittivity sensing is performed by loading the SRRs with dielectric samples. One transmission notch is observed for the identical loads, whereas the non-identical samples produce two split notches. The sensor's operating principle is described through a circuit model analysis. A prototype of the designed sensor is fabricated and experimentally validated for verifying the differential sensing concept. The developed device can be used to compare or differentially characterize solid dielectric samples improving the robustness to environmental factors producing cross-sensitivity or miscalibration.

Differential Sensors Using Microstrip Lines Loaded With Two Split-Ring Resonators