Seminar: John Volakis

“Ultra Wideband Millimeter-Wave Simultaneous Transmit/Receive Radios”
Thursday, Oct. 26 at 1:00pm
LAR 234
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Next-Generation wireless radios will rely on the millimeter-wave (mm-Wave) spectrum to deliver faster data speeds in the context of spectrally agile resource allocation for reliable communications. Realizing this promise requires high speed digital technology and wideband RF hardware that are not prone to in-band and out-of-band interferers. While modest bandwidths have been sufficient in the past, higher data rates, multiple beams, and higher transmit/receive gains are likely to be the norm for future applications. With this in mind, there is a need to develop ultra wideband hardware for full duplex radios. A technology, referred to as simultaneous time/frequency domain duplexing or simultaneous transmit and receive (STAR) or in-band full duplexing (IBFD), can enable existing and future radios to achieve two-fold improvement in spectral efficiency.

Our group has been an early leader in developing and demonstrating wideband full-duplex systems for over a decade. Wideband antennas with suitable feed networks can provide 40 dB suppression of the coupled high-power self-interference Tx signal. In addition, a first-ever FIR-based wideband RF-self interference cancellation (SIC) filter with delays and attenuators was demonstrated to achieve a combined cancellation of 70dB across 500MHz bandwidth. Further analog and digital stage cancellations can allow for 120dB total self-interference cancellation. Even more, cognitive radio and customized Machine Learning (ML) and Artificial Intelligence (AI) algorithms can provide for smart and reconfigurable full duplex radios that adapt to different environment.
In this presentation, we will present techniques to achieve full-duplex radios with 120dB cancellation across at least 500MHz.


John L. Volakis is the Dean of the College of Engineering and Computing at Florida International University (FIU), and a Professor in the Electrical and Computer Engineering Dept. He is an IEEE, AAAS, NAI, URSI and ACES Fellow. Prior to coming to FIU, he was the Roy and Lois Chope Chair in Engineering at Ohio State and a Professor in the Electrical and Computer Engineering Dept. (2003-2017). He also served as the Director of the Ohio State Univ. ElectroScience Laboratory for 14 years. His career spans 2 years at Boeing, 19 years on the faculty at the University of Michigan-Ann Arbor, and 15 years at Ohio State. At Michigan he also served as the Director of the Radiation Laboratory (1998-2000).

Dr. Volakis has 40 years of engineering research experience, and has published over 450 journal papers, 950 conference papers, over 30 chapters and 31 patents. In 2004, he was listed by ISI Web of Science as one of the top 250 most referenced authors, and his google h-index=76 with over 31000 citations. He mentored over 107 Ph.Ds/Post-Docs and has written with them 43 papers which received best paper awards. He is one of the most active researchers in electromagnetics, RF materials and metamaterials, antennas and phased array, RF transceivers, textile electronics, millimeter waves and terahertz, EMI/EMC as well as EM diffraction and computational methods. He is also the author of 9 books, including the Antenna Handbook, referred to as the “antenna bible.” His research team is recognized for introducing and/or developing 1) hybrid finite method for microwave engineering, now defacto methods in commercial RF design packages, 2) novel composite materials for antennas & sensor miniaturization, 3) a new class of wideband conformal antennas and arrays with over 30:1 of contiguous bandwidth, referred to as tightly coupled dipole antennas, already garnering over 6 million citations, 4) textile surfaces for wearable electronics and sensors, 5) battery-less and wireless medical implants for non-invasive brain signal collection, 6) diffraction coefficients for material coated edges, and for 7) model-scaled radar scattering verification methods.