Odjel za antene i širenje elektromagnetskih valova
Odjel za teoriju i primjenu mikrovalova (MTT), Odjel za antene i širenje elektromagnetskih valova (APS), Združeni odjel AES i GRS, Odjel komunikacijskih sustava HATZ te Zavod za radiokomunikacije Fakulteta elektrotehnike i računarstva pozivaju vas na predavanje
Metasurfaces for Manipulating Electromagnetic Waves
koje će održati prof. Anthony Grbic, PhD, profesor na University of Michigan (Ann Arbor, SAD), u ponedjeljak 20. listopada 2014. u 13:00 sati u seminaru Zavoda za radiokomunikacije, XII kat (C12-02).
Sažetak predavanja i životopis predavača pogledajte u nastavku obavijesti.
Metamaterials have provided unprecedented control over electromagnetic fields. However, their notable thickness has often led to fabrication challenges and added loss. This has motivated the development of metasurfaces: the two dimensional analog of metamaterials. Metasurfaces are surfaces textured at a subwavelength scale to achieve tailored electromagnetic properties. They fall into two broad categories. The first class of metasurfaces manipulate electromagnetic wavefronts incident from free space. This type of metasurface tailors the wave transmitted through it, or reflected from it. The second class of metasurfaces guide or radiate waves. The metasurface acts as either a waveguiding structure or supports leaky waves that radiate directive far-field patterns. This talk will describe the development of both types of metasurfaces.
Reflectionless metasurfaces (Huygens’ metamaterial surfaces) that can steer, focus and manipulate the polarization of transmitted electromagnetic waves will be described. These metasurfaces possess both electric and magnetic responses, which allow them to be impedance-matched to the surrounding space. Different metasurfaces that allow polarization control, beam deflection and focusing will be presented. Bianisotropic metasurfaces with enhanced field tailoring properties will also be touched upon. A systematic approach to designing these new metasurfaces will be introduced, and a few experimental devices reported to demonstrate the capabilities of this technology. Next, a new approach to designing 2D inhomogeneous, anisotropic media will be described. The design methodology allows the design of 2D media that support desired spatial distributions of the wave vector and Poynting vector direction. Its utility in the design of metasurfaces will be demonstrated through different design examples. The proposed method allows arbitrary control of electromagnetic fields within a 2D medium. Such spatial control of phase and power flow allows one to mold the phase and amplitude of an aperture field. Preliminary results of a beamformer designed using the proposed methodology will be shown. Finally, the synthesis of radiation patterns using conductor-backed metasurfaces (impedance surfaces) will be explored. A synthesis procedure enabling the design of low-profile, leaky-wave antennas with prescribed far-field patterns will be demonstrated.
Anthony Grbic received the B.A.Sc., M.A.Sc., and Ph.D. degrees in electrical engineering from the University of Toronto in 1998, 2000, and 2005, respectively. In January 2006, he joined the Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, where he is an Associate Professor. His research interests include engineered electromagnetic structures (metamaterials, electromagnetic band-gap materials, frequency selective surfaces), antennas, microwave circuits, plasmonics, wireless power transmission systems, and analytical electromagnetics.
Anthony Grbic received an AFOSR Young Investigator Award as well as an NSF Faculty Early Career Development Award in 2008. In January 2010, he was awarded a Presidential Early Career Award for Scientists and Engineers. In 2011, he received an Outstanding Young Engineer Award from the IEEE Microwave Theory and Techniques Society, a Henry Russel Award from the University of Michigan, and a Booker Fellowship from the United States National Committee of the International Union of Radio Science (USNC/URSI). In 2012, he was the inaugural recipient of the Ernest and Bettine Kuh Distinguished Faculty Scholar Award (an Endowed Associate Professorship) in the Department of Electrical and Computer Science, University of Michigan. Anthony served as Technical Program Co-Chair for the 2012 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting. He is currently an Associate Editor for IEEE Antennas and Wireless Propagation Letters and Vice Chair of the Antennas and Propagation Technical Activities for Chapter IV of the IEEE Southeastern Michigan section.