Ali Ismael Anwer, Zainab S. Muqdad, Taha A. Elwi, Zaid Asaad Abdul Hassain

A New Compact Metamaterial Microwave Sensor Design for Nondestructive Biomedical Measurements

In this work, serval sensor designs are proposed based on developing a basic sensor structure based on a lowcost, highly-sensitive microwave sensor for identifying different liquid samples through monitoring the variation in S21 magnitude. At beginning, this is attempted by applying the use of an interdigital capacitor (IDC) in series connection with a circular spiral inductor (CSI) and connected directly to a photoresistor (LDR). To enhance the sensor insertion losses with a high-quality factor, the proposed sensor is introduced to a Hilbert fractal open stub that is coupled to an interdigital capacitor to operate at 1.22 GHz. The proposed sensor insertion matching is enhanced by using two fractal stubs as matching circuits. The accuracy of the proposed sensor is significantly improved using a back loop trace. Therefore, with such technique, the nonlinear effects due to the multi-layers diffractions are eliminated. Such novel process linearized the sensor response variation with respect to the material under test introduction. An analytical model based on circuit theory is suggested to realize the proposed sensor operation. It is found an observable influence of varying the LDR value on the sensor insertion losses. Such an observation motivated the authors to realize the proposed sensor prototype. The proposed sensor is manufactured and tested experimentally before and after the samples introduction. Therefore, during the measurements, a human urine is mounted on the LDR patch through a glass slicer platform to measure the effects varying the urine properties with fixing the light intensity. Finally, the authors found a readable variation that could be an excellent candidate for new generation of urine microwave sensors.

Reference:

DOI: 10.36244/ICJ.2025.2.11

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Please cite this paper the following way:

Ali Ismael Anwer, Zainab S. Muqdad, Taha A. Elwi, Zaid Asaad Abdul Hassain "A New Compact Metamaterial Microwave Sensor Design for Nondestructive Biomedical Measurements", Infocommunications Journal, Vol. XVII, No 2, June 2025, pp. x-y., https://doi.org/10.36244/ICJ.2025.2.11