An iterative time reversal high-power microwave approach to detect resonant frequencies of electronics

Iterative time reversal is a signal processing technique used with wideband electromagnetic pulse reflections from scatterers that has been shown to self-focus on the dominant frequency of simple resonators. Frequency selective iterative time reversal can be implemented to converge on the most dominant resonance of the scatterer within the desired frequency range. In this work, an automated frequency selective iterative time reversal resonance detection measurement system was constructed and evaluated in both a large GTEM and with an antenna in a semi-reverberant room. The GTEM setup was validated using three different wires of known resonance (via simulation) and converged to within a 5% difference of the expected resonant frequency out of a gigahertz of bandwidth using both time and frequency-domain background subtraction methods to isolate the DUT response from the environment. The GTEM setup was further validated using an additional four studies to compare the measured response to the expected theoretical response and succeeded in all four cases. The semi-reverberant room setup was able to converge even closer to the expected value for the simple scatterers despite ambient noise that was higher in power than the reflection of the DUT but was outside of the filtered frequency range. Three electrically complex DUTs were then measured in the GTEM and one in the semi-reverberant room. The results of the GTEM and semi-reverberant room agreed for the one electrically complex DUT and two of the three electrically complex DUT produced resonances at known frequencies of the devices’ wireless operation inside the GTEM (which was shielded from ambient RF). The GTEM and semi-reverberant room setups accurately measured the response of known resonators, responded as expected based on theory, and matched the measured resonance of an electrically complex DUT. Therefore, the resonant frequencies measured from all three electrically complex DUTs using the frequency selective iterative time reversal signal processing method are believed to be accurate.

Name thesis:degree_name

M.S. (Master of Science)

Level thesis:degree_level

Masters

Discipline thesis:degree_discipline

Mechanical Engineering (UMKC)

Grantor

University of Missouri--Kansas City

Year dc:date.issued

2024

Author dc:creator

• Karnes, Simeon

Advisor dc:contributor.advisor

• Fields, Travis

Handle dc:identifier.uri

https://hdl.handle.net/10355/106904

OAI identifier oai:identifier

oai:mospace.umsystem.edu:10355/106904