题目： The Physics and Engineering of Metamaterial-inspired Electrically Small Scattering and Radiating Systems
The introduction of metamaterials and metamaterial-inspired structures into the tool set of RF engineers and Optical physicists has led to a wide variety of advances in discovery within research areas treating structures that radiate (e.g., RF antennas) and scatter (e.g., optical nano-antennas). The increased awareness of complex media, both naturally occurring and artificially constructed, which has been stimulated by the debut of metamaterials, has enabled paradigm shifts in terms of our understanding of how devices and systems operate and our expectations of their performance characteristics. These shifts include the trends of miniaturization, enhanced performance (total radiated power, bandwidth and directivity) and multi-functionality. New techniques have been developed that are impacting practical realizations. These include dispersion engineering (tailoring material and geometry resonances), scattering mitigation (cloaking, active jamming, perfect absorbers), field localization (sensors, nonlinearities), and output beam shaping (leaky wave broadside radiators, sub-diffraction limit resolution in remote sensing, and highly directive beams for energy transfer and low probability of intercept systems).
A number of advances in the use of metamaterial-inspired constructs to improve the overall efficiency, directivity and bandwidth performance of electrically small antennas (ESAs) in several frequency regimes will be reviewed briefly. A variety of metamaterial-inspired designs have been fabricated and tested; these measurement results are in very nice agreement with predictions. While initial efforts emphasized simply high overall efficiencies without using any external matching networks, more recent resonant near-field parasitic (NFRP) designs have also explored the ability to exhibit multi-functional performance, enhanced bandwidths, and higher directivities in electrically small systems. Multi-functionality is achieved by combining multiple NFRP elements with simple driven radiators. Enhanced bandwidths and loss mitigation are achieved by augmenting the NFRP antenna internally with non-Foster (active) elements. Higher directivity is obtained by simultaneously exciting balanced electric and magnetic NFRP elements, leading to broadside radiating Huygens sources. These interrelated metamaterial-inspired engineering paradigms will be described.
Richard W. Ziolkowski received the Sc. B. (magna cum laude) degree (Hons.) in physics from Brown University, Providence, RI, USA, in 1974; the M.S. and Ph.D. degrees in physics from the University of Illinois at Urbana-Champaign, Urbana, IL, USA, in 1975 and 1980, respectively; and an Honorary Doctorate degree from the Technical University of Denmark, Kongens Lyngby, Denmark in 2012. He is currently a Distinguished Professor in the Global Big Data Technologies Centre in the Faculty of Engineering and Information Technologies (FEIT) at the University of Technology Sydney, Ultimo NSW, Australia. He became a Professor Emeritus at the University of Arizona in 2018, where he was a Litton Industries John M. Leonis Distinguished Professor in the Department of Electrical and Computer Engineering in the College of Engineering and was also a Professor in the College of Optical Sciences. He was the Computational Electronics and Electromagnetics Thrust Area Leader with the Engineering Research Division of the Lawrence Livermore National Laboratory in Livermore, CA, USA before joining The University of Arizona, Tucson, AZ, USA, in 1990.
Prof. Ziolkowski is the recipient of the 2019 IEEE Electromagnetics Award (IEEE Field Award). He is a Fellow of the Institute of Electrical and Electronics Engineers (IEEE, 1994), the Optical Society of America (OSA, 2006), and the American Physical Society (APS, 2016). He served as the President of the IEEE Antennas and Propagation Society in 2005. He is also actively involved with the URSI, OSA and SPIE professional societies. He was the Australian DSTO Fulbright Distinguished Chair in Advanced Science and Technology from 2014-2015. He was a 2014 Thomas-Reuters Highly Cited Researcher. He and Prof. Nader Engheta, University of Pennsylvania, are Co-Editors of the best-selling 2006 IEEE-Wiley book, Metamaterials: Physics and Engineering Explorations.