Combining Metamaterials and Electromagnetic Bandgap Structures to Enable Multifunctional Compact Microwave and Millimeter-wave Circuits and Antennas
Metamaterials (MTMs) and electromagnetic bandgap structures (EBGs) are related technologies that have seen growing adoption in microwave and millimeter-wave circuits and antennas. However, the utility of the EBG bandgap often comes at the expense of the typically large EBG unit cells that limits their inclusion in highly space-constrained scenarios, e.g. within microstrip devices and antennas. On the other hand, many MTMs, such as the transmission-line (TL) MTM, afford very small unit cells through reactive loading but aren’t specifically designed to support controllable bandgap behaviour. A new technology known as the metamaterial-based electromagnetic bandgap structure (MTM-EBG) has proven successful in achieving strong and predictable bandgaps in compact microstrip structures. The bandgap behaviour is achieved in a compact fashion by embedding a multiconductor TL within the microstrip, and then using TL MTM-based reactive loading concepts to force the contradirectional coupling of supported TL modes. Importantly, the MTM-EBG is uniplanar, without vias, and can be fully printed, making it particularly useful for simple and cost-effective integration into microstrip antennas and feed networks. The utility of the MTM-EBG is further established by the fact that its dispersion properties may be rigorously and accurately designed using multiconductor TL theory, eliminating ad-hoc approaches and minimizing arbitrary tuning.
This talk will review the many examples of MTM-EBG usage in microwave and millimeter-wave circuits, antennas, and antenna systems combining MTM-EBG devices that have been demonstrated in the recent literature. These include multi-band microstrip impedance transformers, matching networks, Wilkinson power dividers, and directional couplers, as well as a variety of multi-band/multi-polarization patch antennas, all fabricated in a uniplanar, via-less, and often fully printed fashion. The talk will invoke concepts from traditional RF/microwave and antenna engineering, metamaterials, and electromagnetic bandgap structures and spans theory to numerical and experimental validation to application; importantly, it shows that the intriguing properties of metamaterials and electromagnetic bandgap structures have feasible, tangible industry applications enabling more functional and lower-cost devices for current and future microwave and millimeter-wave systems.
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- 2500 University Dr NW
- Calgary, Alberta
- Canada T2N1N4
- Building: ICT Building
- Room Number: 516
- Starts 05 April 2023 09:21 PM UTC
- Ends 14 April 2023 09:00 PM UTC
- No Admission Charge
Speakers
Ashwin Iyer
Biography:
Ashwin K. Iyer (Senior Member, IEEE) received the B.A.Sc. (Hons.), M.A.Sc., and Ph.D. degrees in electrical engineering from the University of Toronto, Toronto, ON, Canada, in 2001, 2003, and 2009, respectively, where he was involved in the discovery and development of the negative-refractive-index transmission-line approach to metamaterial design and the realization of metamaterial lenses for free-space microwave subdiffraction imaging. He is currently a Professor and Vice Chair with the Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, Canada, where he leads a team of graduate students investigating novel RF/microwave circuits and techniques, fundamental electromagnetic theory, antennas, sensors, and engineered metamaterials/metasurface, with an emphasis on their applications to microwave and optical devices, defence technologies, and biomedicine. He has co-authored a number of highly cited papers and four book chapters on the subject of metamaterials.
Dr. Iyer is a member of several IEEE AP-S committees including its Administrative Committee, and he served as a Technical Program Committee Co-Chair for the 2020, 2016, and 2015 AP-S/URSI International Symposia. He was a recipient of the IEEE AP-S R. W. P. King Award in 2008, the IEEE AP-S Donald G. Dudley Jr. Undergraduate Teaching Award in 2015, the University of Alberta Provost’s Award for Early Achievement of Excellence in Undergraduate Teaching in 2014, and the University of Alberta Rutherford Award for Excellence in Undergraduate Teaching in 2018. His students are the recipients of several major national and international awards for their research.
He serves as Chair for the IEEE Northern Canada Section’s award-winning joint chapter of the MTT-S and AP-S. From 2012 to 2018, he was an Associate Editor of the IEEE Transactions on Antennas and Propagation, and currently serves as a Track Editor. He was also a Guest Editor for the IEEE Transactions on Antennas and Propagation Special Issue on Recent Advances in Metamaterials and Metasurfaces. He is a Registered Member of the Association of Professional Engineers and Geoscientists of Alberta.