Strongly Enhanced Sensitivity in Planar Microwave Sensors Based on Metamaterial Coupling
By M. Abdolrazzaghi, M. Daneshmand, Ashwin K. Iyer. IEEE transactions on microwave theory and techniques, 2017
288 citations recorded by the source corpus.
Limited sensitivity and sensing range are arguably the greatest challenges in microwave sensor design. Recent attempts to improve these properties have relied on metamaterial (MTM)-inspired open-loop resonators coupled to transmission lines (TLs). Although the strongly resonant properties of the resonator sensitively reflect small changes in the environment through a shift in its resonance frequency, the resulting sensitivities remain ultimately limited by the level of coupling between the resonator and the TL. This paper introduces a novel solution to this problem that employs negative-refractive-index TL MTMs to substantially improve this coupling so as to fully exploit its resonant properties. A MTM-infused planar microwave sensor is designed for operation at 2.5 GHz, and is shown to exhibit a significant improvement in sensitivity and linearity. A rigorous signal-flow analysis of the sensor is proposed and shown to provide a fully analytical description of all salient features of both the conventional and MTM-infused sensors. Full-wave simulations confirm the analytical predictions, and all data demonstrate excellent agreement with measurements of a fabricated prototype. The proposed device is shown to be especially useful in the characterization of commonly available high-permittivity liquids as well as in sensitively distinguishing concentrations of ethanol/methanol in water.
Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/96f43f929bad1096e4288012b5feca02776ef13c
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Biomedical Engineering
In Electrical and Electronic Engineering
In Electronic, Optical and Magnetic Materials
Citations in the corpus
- Transmission Lines Terminated With LC Resonators for Differential Permittivity Sensing (2018, background): “TRANSMISSION lines loaded with planar resonators are popular in microwave sensor designs due to their high sensitivity, low cost, and real-time detection [1].”
- Ultrahigh-Sensitivity Microwave Sensor for Microfluidic Complex Permittivity Measurement (2019, methodology): “The sensors in [28], [41], and [47] use SRRs for microfluidic dielectric sensing in different configurations.”