Abstract
In this work, a compact dielectric sensor for the detection of adulteration in solid and liquid samples using planar resonators is presented. Six types of filter prototypes operating at 2.4 GHz are presented, optimized, numerically assessed, fabricated and experimentally validated. The obtained experimental results provided an error less than 6% with respect to the simulated results. Moreover, a size reduction of about 69% was achieved for the band stop filter and a 75% reduction for band pass filter compared to standard sensors realized using open/short circuited stub microstrip lines. From the designed filters, the miniaturised filter with Q of 95 at 2.4 GHz and size of 35 mm × 35 mm is formulated as a sensor and is validated theoretically and experimentally. The designed sensor shows better sensitivity, and it depends upon the dielectric property of the sample to be tested. Simulation and experimental validation of the designed sensor is carried out by loading different samples onto the sensor. The adulteration detection of various food samples using the designed sensor is experimentally validated and shows excellent sensing on adding adulterants to the original sample. The sensitivity of the sensor is analyzed by studying the variations in resonant frequency, scattering parameters, phase and Q factor with variation in the dielectric property of the sample loaded onto the sensor.
Highlights
In the last decades, there has been a growing interest in microwave sensors [1] in various domains of science and engineering
The work discussed in the paper demonstrates the design and miniaturisation of planar microstrip resonator filter to make it operational as a sensor with high sensitivity in testing adulteration in food samples
An optimised size reductions of 69% for BSF and 79% for BPF filters were achieved, in comparison with the standard design, using open and short-circuited, quarter wavelength stubs and other state of the art sensors
Summary
There has been a growing interest in microwave sensors [1] in various domains of science and engineering. [41] presents a four-cell CSRR hexagonal configuration for measuring the glucose level, and the sensitivity of the design is included Another application of the microwave sensor is the characterization of concrete samples of building materials and is discussed in [42]. The work in [46] discusses the multi-band RF planar sensor fabricated on FR4 epoxy operating in microwave sensors operating at different bands, namely, 1.5 GHz, 2.45 GHz, 3.8 GHz and 5.8 GHz. With the extensive literature survey, the application of planar-resonator-assisted sensors for detecting adulteration in food is carried out in this paper. Microwave-based microfluidic sensors discussed in [53] for glucose monitoring in aqueous solution is initiated from a band stop filter and is a biosensor consisting of a quarter wave-length stub implemented in a thin film microstrip technology.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
