access icon free Real-time non-intrusive RF biochemical sensor

© The Institution of Engineering and Technology
Received 05/06/2020, Published 07/07/2020

In this Letter, a non-destructive microwave resonant sensor based on the modified complementary split-ring resonator has been proposed and analysed with respect to its sensitivity for detecting the aqueous biochemicals. This technique is based on the perturbation theory and only requires to measure resonant frequency and hence, achieving a substantial reduction in the computation time and cost. The proposed sensor is designed to achieve high sensitivity performance with a measured quality factor of the sensor in the bare state, Q B = 631.5, at the centre frequency of f o = 6.31 GHz. The proposed sensor has a maximum sensitivity of S = 6.23 MHz with respect to a unit change in the dielectric constant value. A numerical model is developed for the dielectric constant of the biochemicals as a function of the resonant frequency. The proposed sensor, therefore, provides high sensitivity, simple structure layout and real-time response with cost effectiveness. The proposed structure can be a potential candidate for the non-intrusive sensing of aqueous biochemicals.

Inspec keywords: Q-factor measurement; split ring resonators; microwave measurement; biological techniques; microwave resonators; perturbation theory; frequency measurement; chemical variables measurement; biochemistry; microwave detectors; numerical analysis; chemical sensors

Other keywords: nonintrusive RF biochemical sensor; dielectric constant value; modified complementary split-ring resonator; quality factor measurement; frequency 6.31 GHz; aqueous biochemical detection; frequency 6.23 MHz; nondestructive microwave resonant sensor; numerical model; perturbation theory

Subjects: Microwave measurement techniques; Metamaterials and structures (microwave); Chemical sensors; Chemical sensors; Microwave circuits and devices; Biological engineering and techniques; Waveguide and microwave transmission line components; Other numerical methods; Numerical approximation and analysis; Biophysical instrumentation and techniques; Time and frequency measurement; Chemical variables measurement; Frequency measurement

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