February 2018

I am pleased that a paper titled “A Time-Domain Measurement System for UWB Microwave Imaging” has been published in IEEE Transactions on Microwave Theory and Techniques, in 2018, that I am a co-author on through work with the Celadon Research Division of Ellumen Inc. This paper discusses a fully automatic time domain measurement system for microwave imaging using a pair of movable antennas to transmit and receive custom UWB pulse designs. The system described in the paper incorporates some elements from the Microwave Imaging Device patent previously discussed where a pair of movable antennas are independently controlled to rotate around a region of interest. This paper builds upon work previously presented in 2017, in IEEE Transactions on Microwave Theory and Techniques in the paper “A Phase Confocal Method for Near-Field Microwave Imaging” and at the IEEE AP-S Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting in the the poster presentation titled “Experimental Microwave Near-field Detection with Moveable Antennas.” The prior two works discussed using the system in the frequency domain with a vector network analyzer to generate and receive signals. In this new paper the time domain use of the system is described using an arbitrary waveform generator to generate signals and a digital phosphor oscilloscope to receive signals.

I have included an excerpt from the accepted version of the paper below. DOI: https://doi.org/10.1109/TMTT.2018.2801862 © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

microwave imaging time domain device

Figure 2 in the paper shows the system as was set up at Ellumen Inc. along with a PVC cylinder placed in the middle tray. A reconstructed image from data collected using the setup in Figure 2 using the delay multiply and sum (DMAS) imaging algorithm is shown in Figure 9. In Figure 10(a) the object was changed to a metallic object and a long wood square object both placed in the middle tray. A reconstructed image produced using DMAS is shown in Figure 10(b). Also note that the DMAS algorithm was programmed on eight nVidia Tesla GPUs which allowed images to be produced in under 1 minute. A comparison between the time domain system and frequency domain system was performed in the paper but is not included in the above excerpt. This analysis showed that both methods of data collection can allow for accurate reconstructed images to be obtained. The software to control the data collection was also updated as presented in this paper so that it takes 20 minutes to complete both incident and total field data collections. I encourage you to download and read the full “A Time-Domain Measurement System for UWB Microwave Imaging” paper from IEEE for full details and analysis.

I was able to attend a college basketball game at Allstate Arena in Rosemont, Illinois, on Saturday, February 17, 2018. The Northwestern University Wildcats played the Michigan State University Spartans. All homes games for the 2017 to 2018 Northwestern University basketball season are being played at Allstate Arena while Welsh-Ryan Arena undergoes a renovation.

Northwestern faced a tough opponent in Michigan State as they were the #2 AP ranked men’s college basketball team in the U.S. coming into the game. Northwestern played extremely well in the first half and led by 27 points at one point before going into halftime up 49 to 27. However, Northwestern struggled in the second half scoring only 11 points total. Michigan State won the game with a score of 65 to 60.

Northwestern forward Vic Law lead the team with 21 points and 5 assists. Northwestern forward Gavin Skelly added 11 points and 2 rebounds and center Dererk Pardon had 8 points and 6 rebounds; however, both had foul trouble late and had trouble staying on the floor. Michigan State guard Cassius Winston had 17 points, 10 rebounds, and 7 assists. Northwestern had a chance to knock off a top team, but failed to score for more than than 11 minutes in the second half.

Below are some pictures I took while at Allstate Arena during the Michigan State vs Northwestern college basketball game.

Northwestern Michigan State basketball

Northwestern Allstate Arena starting lineup

Northwestern Michigan State tip off

Northwestern Michigan State huddle

Allstate Arena college basketball

Northwestern cheerleading

Northwestern Michigan State halftime

Michigan State basketball bench

Michigan State Northwestern Allstate Arena

Northwestern basketball pass

Northwestern Michigan State dribble