DOI: 10.1109/TMTT.2024.3429536   IEEEXplore: https://ieeexplore.ieee.org/document/10612268

Transmission-Mode Phase-Variation Planar Microwave Sensor

2 GHz (1-3 GHz)

The sensitivity is significantly enhanced by applying a cascade of inverters shunt-connected to the host line in a "T" junction terminated with the sensing resonator. Significant attention is paid to the losses in the theoretical sensitivity analysis discussion to predict the sensitivity in the limit of small perturbations.

Defect detection in samples, micrometer-scale proximity detection, liquid level, temperature, humidity and many other measurement applications.

Transmission-Mode Phase-Variation Permittivity Sensor: 0.0288 λ2 sensing size, 0.3515 λ2 overall size, 227.9° maximum sensitivity, 7912 °/ λ2 figure of merit. Microwave Linear Displacement/Proximity Sensor: 2684 °/mm maximum sensitivity; 0.01 mm resolution; <0.1 mm dynamic range.