报告时间：5月10日下午1点30分

报告地点：光学楼525室

Seminar on：Design and advanced applications of planar and conformal, periodic width-modulated microstrip line configurations

Abstract：

The talk will focus on the use of printed periodic structures in the field of advanced electromagnetic applications as leaky wave antennas and synthesis of mantle cloak. Such structures are characterized by the mean of the dispersion diagram (DD), i.e. the representation of the actual wave number versus frequency, and represent the solution of the homogeneous problem formulated in terms of Maxwell's equations. Usually, such diagrams are obtained numerically as the eigenmodes for the unit cell with appropriate boundary conditions. If a media parameter (e.g. the effective dielectric constant) varies in sinusoidal way inside the unit cell, the DD has a closed form solution for both transverse electric (TE) and transverse magnetic (TM) propagations in terms of Mathieu’s or Hill's functions. From such a diagram, one can extract information on wave propagation, like phase and group velocity, effective media parameters, band-gaps, etc.

In the antenna community, leaky wave antennas and wide band cloaking represent fields where characteristics of such configurations can be efficiently exploited from engineering point of view. Experimental validation of the theoretical aspects will be presented for such applications. Some recent findings on the synthesis of non-scattering devices for cloaking applications using composite structures, forming 2D metasurfaces (mantle of invisibility), able to engineer field propagation and radiation will be discussed. The use a novel formulation for invisibility cloaks and their implementation with a conformal metasurface realized with the proposed technique will be shown and described.

Short Bio：