Liquid sensing using active feedback assisted planar microwave resonator

From National Research Council Canada

DOIResolve DOI: http://doi.org/10.1109/LMWC.2015.2451354
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Name affiliation
  1. NINT
TypeArticle
Journal titleIEEE Microwave and Wireless Components Letters
ISSN1531-1309
1558-1764
Volume25
Issue9
Pages621–623
SubjectS-parameters and high resolution sensing; active device; liquid sensing; microwave passive resonator
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.
Publication date
PublisherIEEE
LanguageEnglish
Peer reviewedYes
NPARC number23001550
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