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Engineering Passive and Active Metamaterial-inspired Electrically Small Radiating Systems
时间:2017-10-10 10:28    点击:   所属单位:电子工程学院
讲座名称 Engineering Passive and Active Metamaterial-inspired Electrically Small Radiating Systems
讲座时间 2017-10-20 11:00:00
讲座地点 西安电子科技大学北校区图书馆西裙楼三楼报告厅
讲座人 Prof. Richard W. Ziolkowski
讲座人介绍 Richard W. Ziolkowski (ScB, Magna cum Laude with Honors, 1974, Brown University; MS, 1975, and PhD, 1980, from the University of Illinois at Urbana-Champaign, all in Physics) is a Distinguished Professor with the Global Big Data Technologies Centre (GBDTC) at the University of Technology Sydney in Ultimo NSW, Australia. He is also a Litton Industries John M. Leonis Distinguished Professor in the Department of Electrical and Computer Engineering and a Professor in the College of Optical Sciences at the University of Arizona. He was awarded an honorary doctoral degree (Doctor Technish Honoris Causa) from the Technical University of Denmark in 2012. He is a Fellow of the IEEE, OSA and APS professional societies. 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 was the 2014-2015 Australian DSTO Fulbright Distinguished Chair in Advanced Science and Technology and was attached to the Aerospace Composite Technologies team of the Defence Science and Technology Organization at Fisherman’s Bend, Melbourne, Australia. He was President of the IEEE Antennas and Propagation Society in 2005 and remains very active in the IEEE AP-S, URSI, OSA, and SPIE professional societies. 
讲座内容 The introduction of metamaterials and metamaterial-inspired structures into the tool set of RF engineers has led to a wide variety of advances in discovery within the antennas and propagation research areas. The enhanced 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, and multi-functionality of antenna systems for wireless platforms; dispersion engineering to modify the properties, for example, of transmission lines and antennas; scattering mitigation (cloaking, active jamming, perfect absorbers) and enhancements (sensors, detectors); and the tailoring output beams (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 the VHF, UHF and microwave regimes will be reviewed. Several metamaterial-inspired ESA designs have been fabricated and tested; these measurement results are in 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, higher directivity and enhanced bandwidths. Multi-functionality is achieved by combining multiple NFRP elements in an electrically small package. Higher directivity from an electrically small system is obtained by combining electric and magnetic NFRP elements to realize Huygens dipole antennas. Enhanced bandwidths are achieved in an electrically small system by augmenting the NFRP antenna internally with non-Foster (active) elements, which are implemented as negative impedance convertor (NIC)-based inductors and capacitors. The development an electrically small system sharing all of these interesting characteristics has been achieved and will be discussed. Connections to similar enhanced radiation and scattering performance characteristics at higher frequencies, such as optical nanoantenna systems, will also be described. 
天线与微波技术国家重点实验室      IEEE AP/MTT  Xi’an Chapter
天线与电磁散射研究所              国际合作与交流处         电子工程学院
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