Subject Area
Electrical, Electronics Engineering
Abstract
Nonionizing electromagnetic waves provide a noninvasive evaluation of biological tissues affected by dielectric property variations. The interactions of electromagnetic waves with tissues in different dielectric properties affect wave scattering. The tissue type and condition can be determined by evaluating resonant frequency shift and magnitude changes in reflection or transmission coefficients. Planar resonators provide a compact size and can be fabricated on monolithic, flexible substrates conforming to the skin, making it potentially wearable that can continuously monitor body functions in the long term. However, most planar resonators fail to provide sufficiently high-intensity field densities and spatial resolutions into the tissues due to their poor resonance at microwaves, suffering from low sensitivity. Additional dynamic matching circuits may achieve a high-quality factor but are bulky with design constraints, increase insertion losses, and limit resonance frequency ranges. It is challenging for wide-band impedance matching to achieve a high-quality factor in a conformal microwave resonator without losing the advantages of being small and planar. Targeting the challenges, my work developed a self-tuned method for impedance-matching. Based on this novel method, this work aims to develop biomedical sensing applications such as human hydration assessment, glucose level monitoring, subcutaneous tumor detection, vein finder, etc.
Degree Date
Summer 2024
Document Type
Dissertation
Degree Name
Ph.D.
Department
Electrical and Computer Engineering
Advisor
Jung-Chih Chiao
Second Advisor
Carlos E. Davila
Third Advisor
Behrouz Peikari
Fourth Advisor
Jianhui Wang
Fifth Advisor
Changzhi Li
Sixth Advisor
Yang Li
Number of Pages
231
Format
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Bing, Sen, "Noninvasive Electromagnetic Biomedical Sensing" (2024). Electrical Engineering Theses and Dissertations. 80.
https://scholar.smu.edu/engineering_electrical_etds/80
Included in
Biomedical Commons, Biomedical Devices and Instrumentation Commons, Electrical and Electronics Commons, Electronic Devices and Semiconductor Manufacturing Commons, Other Biomedical Engineering and Bioengineering Commons, Signal Processing Commons