报告题目：Meta-Atoms for 3D Printing Metamaterials
报 告 人：Yiannis教授
摘要：In this talk we will introduce the concept and uses of Meta-Atoms (MTAs) in Electromagnetic metamaterials. MTAs take the form of metallic or dielectric meso scale cuboid inclusions which could be 3D-printed in multi-layered metamaterials with different periodicities. Potentially these meta-atoms could be varied in constitution and geometry to augment a variety of artificial magnetodielectric properties. The effect of their periodicity on the effective EM properties (constitutive parameters) is examined by placing the 3D-printed samples in a waveguide or on a resonator. Some of these structures have been applied in engineering applications such as antennas and microwave lenses, prototypes of which will be shown.
Yiannis Vardaxoglou (DoB: 3 Sept. 1959, place: Athens Greece, Greek and British national). BSc degree in Mathematics (Mathematical Physics) in 1981 and PhD in Electronics in 1985 both from the University of Kent at Canterbury. He joined Loughborough University of Technology in 1988 as a Lecturer, was promoted to Senior Lecturer in January 1992 and in 1998 he was awarded a full professorship. He was the Head and the first Dean of the Electronic, Electrical and Systems Engineering School at Loughborough University from 2006 to 2012. He is internationally recognized for his quality research efforts and professional society activities. He has pioneered developments in the research, design and applications of frequency selective surfaces (FSS) and antennas, and a number of his innovations have been exploited by industry. His broad interests and expertise includes wireless communications, fixed and mobile communication systems and microwave and mm-wave engineering. His research interests include metamaterials, antennas, wearable electronics and 3D printing (additive manufacturing) for RF, microwave and mmwave electronics.
His work on frequency selective surfaces and his discovery of associated closely-coupled surface effects led to efficient electromagnetic (EM) screen designs, which are crucial for low radar cross section radomes. These EM screen designs were exploited by both BAE Systems and Chelton Radomes. More recently he has worked on metamaterials and has promoted this innovative technology widely across Europe. Furthermore, he established the Wireless Communications Research (WiCR) group at Loughborough University. This WiCR group is 28 years old has had research breakthroughs on novel planar metamaterials using negative refractive index (NRI) materials. He was first to publish uniplanar surface designs that exhibit negative effective refractive index at microwave and mm-wave frequencies. Further, he was first to publish completely planar artificial magnetic conductor (AMC) surfaces that are simultaneously electromagnetic band gap structures for surface wave suppression. He has published in excess of 300 papers and has attracted £14M in research grants and contacts from EPSRC, EU and i
As a consequence of the growth in the mobile communication market, Prof. Vardaxoglou in 2001 founded and acts as the Technical Director of Antrum Ltd, a company which supplies antenna solutions to service providers, such as Orange, handset manufacturers and many other small and medium enterprises (SMEs). It also provides testing services to companies such as France and Lewis and Vodafone. Prof. Vardaxoglou has an ongoing collaboration with the European Space Agency (ESA/ESTEC), The Netherlands, on many projects. They commissioned his WiCR Group to research the analysis and design of electromagnetic band gap (EBG) and artificial magnetic conductor (AMC) surfaces and the applications of these and other classes of metamaterials to achieve highly efficient and lightweight leaky-wave antennas for inter-satellite links. Moreover, with a DTI Smart award (granted to Antrum Ltd) and an ESA contract, his WICR group has developed antenna technologies that exploit metamaterials in flexible antennas for search and rescue applications. He has taught extensively in communications related topics at both the undergraduate and postgraduate levels, directed mainly towards electromagnetic aspects, including antennas and microwave engineering. These topics at the undergraduate and the postgraduate levels have included courses on antennas and radar, electromagnetic compatibility and microwave and optical transmission.
He has been the past Chair of the IEEE AP-S Distinguished Lecturer Program. He has been either the Chair or a member of the organizing committee for numerous prestigious international IEEE and IEE/IET Conferences. He was originally involved heavily with the former bi-annual International Conference on Antennas and Propagation (ICAP) which was one of the two conferences that paved the way to the formation of the European Conference on Antennas and Propagation. It was under his chairmanship that the IET’s professional network on antennas and propagation promoted and influenced the network which eventually formed EUCAP. He has had a significant leadership role in the organization and implementation of the EUCAP series. He was the General Chair of the second and very successful 2006 EUCAP event in Edinburgh, Scotland. He also established the extremely successful annual Loughborough Antennas and Propagation Conference (LAPC), which is coming up to its 15th year.
He is the director of Symeta research centre,(www.symeta.co.uk ) funded by an EPSRC Grand Challenge award, researching in a wide-ranging topics applicable to cutting-edge wireless communications technology. His current research focuses primarily on metamaterial structures, additive manufacturing (3D printing) for RF/micro/mm wave engineering. Symeta collaborates with many internationally leading companies and universities. He was recently awarded a prestigious EPSRC’s Grand Challenge £5M (FEC) award: Synthesizing 3D Metamaterials for RF, Microwave and THz Applications, Prof. Vardaxoglou’s outstanding research contributions and professional society service has been recognized many times as evidenced by:
Fellow of the Institution of Engineering and Technology (IET)
Fellow of the Royal Academy of Engineering (FREng)
Fellow of the Institution of Electrical and Electronic Engineers (FIEEE)