Title :
Liquid Sensing Using Active Feedback Assisted Planar Microwave Resonator
Author :
Zarifi, Mohammad H. ; Farsinezhad, Samira ; Shankar, Karthik ; Daneshmand, Mojgan
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Alberta, Edmonton, AB, Canada
Abstract :
A novel electromagnetic sensor operating at microwave frequencies with quality factor of 22,000 at 1.4 GHz for real-time sensing of fluid properties is presented. The core of the sensor has a planar microstrip resonator, which is enhanced using an active feedback loop. The resonance frequency and quality factor of the sensor show clear differentiation between analytes composed of common solvents. To evaluate the sensor for water based concentration detection, we have demonstrated that KOH dilutions as low as 0.1 mM are detectable. The proposed sensor has advantages of inexpensiveness and high resolution as well as capability for miniaturization and CMOS compatibility.
Keywords :
Q-factor; microstrip resonators; microwave resonators; active feedback assisted planar microwave resonator; active feedback loop; electromagnetic sensor; fluid properties; frequency 1.4 GHz; liquid sensing; planar microstrip resonator; quality factor; resonance frequency; Feedback loop; Liquids; Microwave sensors; Q-factor; Resonant frequency; Sensors; Active device; S-parameters and high resolution sensing; liquid sensing; microwave passive resonator;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2015.2451354
