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

Volume

25

Issue

9

fYear

2015

Firstpage

621

Lastpage

623

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;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2015.2451354

Filename

7156155