FES Funded ProjectsOutputs
| Title |
Category |
Date |
Authors |
| Locally Strong-Coupled Microwave Resonator Using PEMC Boundary for Distant Sensing ApplicationsT07-P04, T07-P04NP University of Alberta | Publication | 2019-10-01 | Mehdi Nosrati, Zahra Abbasi, Baghelani, M., Sharmistha Bhadra, Mojgan Daneshmand | | Noncontact high sensitivity chipless tag microwave resonator for bitumen concentration measurement at high temperaturesT07-P04, T07-P04NP University of Alberta | Publication | 2020-04-01 | | | COUPLED MICROWAVE RESONATORS FOR DISTANT SENSING APPLICATIONSShe contributed to MST01-T07-P04NP (UofA) milestone.
"For the past two decades, planar microwave resonators have been used for sensing and monitoring applications due to their unique characteristics such as non-contact and real-time sensing capability, simple and low-cost fabrication process, which make them a high performance alternative to traditional bulky waveguide sensors. However, the limitation of electronic readout circuitry in harsh environment sensing, low-sensitivity, and distance limited sensing performance are the important challenges and limitations for their successful implementation into a wireless sensing system and the Internet of Thing (IoT) ecosystem. The work presented in this thesis focuses on distance and resolution enhancement of coupled split-ring resonator (SRR) based structures, and several highly sensitive distant sensing systems and their applications are presented.
To address the distance limited sensing performance in the conventional SRR-based sensors, a reader-tag structure based on coupled SRR structures is designed. The presence of the second resonator, the tag, enhances the design's sensitivity significantly and enables the sample under the test to be placed at further distances from the reader. Applications of the proposed technology in non-contact real-time hazardous gas sensing, humidity percentage monitoring, and non-invasive glucose concentration sensing is investigated.
In the second step, sensing distance in the reader-tag structure is enhanced using a locally strong coupled microwave resonator. Backed with theory, simulations, optimization, and experimental results, this concept demonstrates the ability to significantly increase the distance between the tag and the reader. The flexible ultra-thin tag resonator empowers the proposed design to perform real-time noncontact sensing using an inexpensive sensing element that could be easily mounted on any material container. The design applications in high-temperature bitumen sensing, humidity monitoring, and disposable microfluidic biomedical sensors are explored.
Furthermore, to enhance the resolution of the sensing, an active feedback loop has been added to the conventional SRR-based planar structure to compensate for different sources of loss and create a sharp high-Q response, capable of high-resolution sensing performance. The application of high-resolution active sensors is investigated for pH level sensing in biomedical and pipeline integrity.
Finally, in order to enable microwave sensing systems to be capable of high-resolution measurement and protect them is harsh environment applications, the active feedback loop and the tag-reader coupled structure are combined in one structure and a flexible low-cost, RF chipless tag-reader sensor is developed, capable of ultra high-quality factor performance. The chipless RF tag is a great candidate for harsh environment sensing applications since the main sensing element in the design is a passive structure. The high level of sensitivity offered by design, empowers it for concentration measurement in nano-liter samples. The presented technique provides a practical solution for highly sensitive, non-invasive, and real-time sensing applications."T07-P04NP | Publication | 2021-01-01 | Zahra Abbasi | | Discrete Microwave Spectroscopy using Planar ResonatorThis work presents wideband harmonic based liquid sensing using planar microwave resonators. A thin layer LTCC substrate is utilized to design and fabricate a ring resonator sensor, monitoring its harmonics up to 40GHz. Non-constant permittivity frequency spectrum of liquids generate correlated nonlinear frequency shifts in the harmonic frequencies. This information can then be employed to backtrack the liquid properties and permittivity across a wideband frequency. Sample reading in a frequency range of 3GHz to 40 GHz represents a satisfactory distinction between different kinds of the liquids under the test. Using de-ionized (DI) water, methanol and propanol, different frequency responses are gathered over the full frequency range of 40 GHz for 5-sample points as reference harmonics.
T07-P04, T07-P04NP University of Alberta | Publication | 2019-05-01 | | | Selective real-time non-contact multi-variable water-alcohol-sugar concentration analysis during fermentation process using microwave split-ring resonator based sensorT07-P04, T07-P04NP University of Alberta | Publication | 2021-01-01 | | | Non-contact real-time water and brine concentration monitoring in crude oil based on multi-variable analysis of microwave resonatorsT07-P04, T07-P04NP University of Alberta | Publication | 2021-01-01 | | | Artificial Intelligence Assisted Non-Contact Microwave Sensor for Multivariable Biofuel AnalysisT07-P04, T07-P04NP University of Alberta | Publication | 2020-01-01 | | | Selective Measurement of Water Content in Multivariable Biofuel Using Microstrip Split Ring ResonatorsT07-P04, T07-P04NP University of Alberta | Publication | 2020-01-01 | | | Selective Volume Fraction Sensing Using Resonant-Based Microwave Sensor and its HarmonicsT07-P04, T07-P04NP University of Alberta | Publication | 2020-01-01 | | | A novel miniaturized asymmetric CPW split ring resonator with extended field distribution pattern for sensing applicationsAPA: N Hosseini, SS Olokede, M Daneshmand, “A novel miniaturized asymmetric CPW split ring resonator with extended field distribution pattern for sensing applications”Sensors & Actuators A: Physical, 304, pp. 111769, https://doi.org/10.1016/j.sna.2019.111769.T07-P04 | Publication | 2020-04-01 | Navid Hosseini, Seyi Olokede, Mojgan Daneshmand | | Volume Fraction Sensing of Multivariable Systems using Multi-Resonances of Planar Microwave ResonatorsHe contributed to MST04-T07-P04NP (UofA) milestone.
"In recent years, sensing and selectivity have been the subject of many types of research due to their practical challenges. The main issue is the limited number of output data that confine the degree of freedom to solve the unknown problem. The majority of multi-variable experiments seek more assisting parameters and independent features for finalizing their solution. Microwave resonators as detecting devices can help gather the required data from the material under test in different experiments. Their resonance shift is one of the features that is mainly utilized for sensing purposes. But, for the detection of multi-variable parameters like multi-subcomponent volumes in a solvent or mixture, more than one independent feature is required. For overcoming this bottleneck, a new material characteristic is required, generating and defining the new independent features. Having more independent features out of the sensor response enables unknown variables identification. In this thesis, the term “harmonic” represents the resonance modes of the microwave resonator. One of the simplest forms of microwave resonators is the split ring resonator (SRR) and ring resonators. These kinds of structures are low-cost, non-invasive, and real-time devices making them a proper candidate for sensing applications. Like any other resonator, their microwave profile can be easily perturbed by introducing the external load and altering their Q-factor as a result. Generally, the rings are resonating structures that generate multiple resonant modes in their frequency response. These resonant mode frequencies are dependent features of the rings as they iterate themselves and their operational band. To make these elements change uniquely and independently, the variant permittivity profile of the materials under test can be considered as a new parameter. Developing the frequency shift of the resonances as a function of real relative permittivity variations defines the multiple independent features and authorizes the multi-variable diagnosis along with material senses. This can be realized by forming the linear system of equations for each independent resonant mode and solving them for volumetric unknowns or sub-component concentrations."
T07-P04NP | Publication | 2021-01-01 | Navid Hosseini |
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