This paper reports a rapid microwave biosensor to check forEscherichia coli contamination in water samples, which can thereafter be extended for testing of other microbes as well. The sensor is a 3x3 array of polystyrene cylinders 8 of which are filled with poly vinyl chloride solid cylinders with the centre hollow cylinder holding the sample to be investigated. The sensor takes only 4-5 minutes for sensitive detection of up to 1-2 Colony forming units (CFU) of Escherichia coli. The present technique thus proves better than all presently available techniques in terms of both sensitivity and resolution and speeds up the detection process manifold. Microwave bio-sensing thus presents itself as a promising solution for rapid, sensitive and user-friendly detection of water contamination.
In this paper characterization of dielectric materials in liquid and powder phase using concentric closed and split ring resonators of length λ, λ/2, and λ/4 is reported. Experimental results have been validated by simulations and theoretically modeling. Sensitivity of the resonator with closed rings was maximum. Experimentally extracted values of dielectric constant of ferrite ranged from 14.05 to 15.1 with closed ring resonators and from 13.6 to 14.02 with split ring resonator, respectively. For spirulina platensis the dielectric constant was lying in the range 1.78–1.93 and 1.74–2.04 with closed ring and split ring resonators, respectively. The values extracted experimentally are in good agreement with simulation and theoretically found values. However, the values obtained from closed ring resonator were in agreement with the dielectric constant values of ferrite and spirulina platensis.
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