Minkowski-like fractal resonator-based dielectric sensor for estimating the complex permittivity of binary mixtures of ethanol, methanol and water

Gulsu M. S., BAĞCI F., CAN S., YILMAZ A. E., AKAOĞLU B.

SENSORS AND ACTUATORS A-PHYSICAL, cilt.330, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 330
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1016/j.sna.2021.112841
  • Dergi Adı: SENSORS AND ACTUATORS A-PHYSICAL
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Biotechnology Research Abstracts, Chemical Abstracts Core, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: Dielectric sensor, Complex permittivity, Microstrip line, Metamaterial, SPLIT-RING RESONATOR, LEVEL MEASUREMENT
  • Ankara Üniversitesi Adresli: Evet

Özet

A microwave dielectric sensor with defected ground structure including a Minkowski-like fractal resonator is proposed for estimating the complex permittivity of ethanol-water, methanol-water and ethanol-methanol mixtures. Positioned glass capillary tubes at the center of the metamaterial normal to the sensor surface, it is possible to see the fast impact of the shift of the transmission response for different liquid mixtures. The dimension of the proposed sensor is as small as 0.17 lambda(0) x 0.17 lambda(0) x 0.010 lambda(0), where 10 indicates the resonance wavelength in free-space. Complex permittivity of the liquid mixtures are estimated based on the shift of the resonance frequency and the magnitude of the S-21 values by using a first-order model incorporating in characteristic matrix formulation. Estimated values indicated a very good agreement with the values in the reported studies. The sensitivity of the proposed sensor related to 0.07 mu L effective sample volume is obtained to be 0.52 MHz/er. The attractive features of the sensor, such as being label-free, reusable, easy to fabricate, practical, non-invasive and real-time, assure accurate determination of the complex permittivity of unknown liquid mixtures for applications in chemistry and medicine. (C) 2021 Elsevier B.V. All rights reserved.