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ESE Seminar: “Surpassing Fundamental Limits through Time Varying Electromagnetics”
March 16, 2021 at 11:00 AM - 12:00 PM
Surpassing the fundamental limits that govern all electromagnetic structures, such as reciprocity and the delay-bandwidth-size limit, will have a transformative impact on all applications based on electromagnetic circuits and systems. For instance, violating principles of reciprocity enables non-reciprocal components such as isolators and circulators, which find application in full-duplex wireless radios, radar, bio-medical imaging, and quantum computing systems. Overcoming the delay-bandwidth-size limit enables ultra-broadband yet extremely-compact devices whose size is not fundamentally related to the wavelength at the operating frequency.
The focus of my talk will be on using time-variance as a new toolbox to overcome these fundamental limits and re-imagine circuit design. Specifically, I will focus on CMOS-integrated time-varying circuits and systems that have enabled: (i) integrated non-reciprocal components operating across frequencies ranging from RF to millimeter waves with multi-watt power handling, (ii) reconfigurable microwave passive components with 100-1000× form-factor reduction, (iii) integrated full-duplex wireless radios with wideband self-interference cancellation, and (iv) the first non-reciprocal Floquet electromagnetic topological insulator with an ultra-wide bandgap. Our prototypes achieve the stringent performance envelopes that are required by practical wireless applications, thus bringing the fields of integrated non-reciprocity and synthetic topological insulators to real-world applications.
Looking to the future, I will briefly describe early-stage cross-disciplinary collaborative research projects that investigate the use of time-varying circuits in cryogenic quantum computing applications and simultaneous-transmit-and-receive MRI.
Ph.D. Candidate, Columbia University
Aravind Nagulu is currently a Ph.D. student in the Department of Electrical Engineering at Columbia University. He received his B.Tech. and M.Tech. degrees in electrical engineering from IIT Madras, Chennai, India, in 2016. His research interests lie in the intersection of integrated circuits, electromagnetics, and communication systems. In particular, he is interested in analog, RF and millimeter-wave circuits, metamaterials, and systems with applications in next-generation communications, imaging, and quantum information processing.
He has authored/co-authored papers in top-tier journals and conferences, including Nature Electronics, Nature Communications, Physical Review X, IEEE JSSC, IEEE TMTT, IEEE ISSCC, IEEE RFIC and IEEE IMS. He was a recipient of the IEEE RFIC Symposium Best Student Paper Award (First Place) in 2018, the IEEE Solid-State Circuits Society Predoctoral Achievement Award 2018-2019, the ISSCC Analog Devices Outstanding Student Designer Award in 2019, the IEEE MTT-S Graduate Fellowship in 2019, and an IEEE RFIC Symposium Best Student Paper Finalist nomination in 2020.