Liquid sensing using active feedback assisted planar microwave resonator

DOI	Resolve DOI: https://doi.org/10.1109/LMWC.2015.2451354
Author	Search for: Zarifi, Mohammad H.; Search for: Farsinezhad, Samira¹; Search for: Shankar, Karthik¹; Search for: Daneshmand, Mojgan
Name affiliation	NINT
Format	Text
Type	Article
Journal title	IEEE Microwave and Wireless Components Letters
ISSN	1531-1309 1558-1764
Volume	25
Issue	9
Pages	621–623
Subject	S-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	2015-09
Publisher	IEEE
Language	English
Peer reviewed	Yes
NPARC number	23001550
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Record identifier	f8af7f5c-1a38-4679-b6f1-46a9f5403e09
Record created	2017-03-06
Record modified	2020-02-06