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Open AccessArticle

Microwave Differential Frequency Splitting Sensor Using Magnetic-LC Resonators

School of Engineering, RMIT University, Melbourne, VIC 3001, Australia
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Sensors 2020, 20(4), 1066; https://doi.org/10.3390/s20041066
Received: 7 January 2020 / Revised: 30 January 2020 / Accepted: 30 January 2020 / Published: 15 February 2020
(This article belongs to the Special Issue Microwave Sensors Based on Resonant Elements)
A differential microwave permittivity sensor and comparator is designed using a microstrip transmission line loaded with a magnetic-LC resonator. The microstrip transmission line is aligned with the electric wall of the resonator. The sensor shows a single transmission zero, when it is unloaded or loaded symmetrically on both halves. A second notch appears in the transmission response by asymmetrical dielectric loading on the two halves of the device. The frequency splitting is used to characterize the dielectric properties of the samples under test. The sensitivity of the sensor is enhanced by removing the mutual coupling between the two halves of the magnetic-LC resonator using a metallic wall. The sensors’ operation principle is explained through a circuit model analysis. A prototype of the designed sensor is fabricated and measurements are used for validation of the sensing concept. The sensor can be used for determination of the dielectric properties in solid materials or detecting defects and impurities in solid materials through a comparative measurement with a reference sample.
Keywords: Differential sensors, microwave sensors, microwave comparator, permittivity sensing. Differential sensors, microwave sensors, microwave comparator, permittivity sensing.
MDPI and ACS Style

Ebrahimi, A.; Beziuk, G.; Scott, J.; Ghorbani, K. Microwave Differential Frequency Splitting Sensor Using Magnetic-LC Resonators. Sensors 2020, 20, 1066.

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