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Most of the metasurfaces are composed with subwavelength building blocks of passive metallic and dielectric resonators; therefore, once the structures are designed and fabricated, their electromagnetic (EM) properties and spectral responses cannot be changed. However, dynamic control of EM wave propagation is often demanded in many practical applications, such as the dynamic beam-forming and scanning...
This paper reports a polarization selective one-way microwave absorber based on composite metamaterial slabs. The polarization selective one-way absorber allows a linearly polarized electromagnetic wave to be absorbed along one particular incident direction and to penetrate through it along the opposite direction. For the cross-polarized wave, the direction dependent propagation properties are reversed...
In this paper, a flat meta-surface constructed by an ensemble of unit cells using I shaped resonant structure is proposed and designed to provide phase discontinuity for electromagnetic wave front manipulation. We demonstrate experimentally that electromagnetic wave deflection is achieved in compliance with the generalized Snell's law at the designed frequency band (around 10 GHz). In addition, the...
In this paper, the efficient analysis of electromagnetic scattering from objects is performed utilizing the characteristic basis function method (CBFM) with the compressed sensing (CS) technique. CBFM generates sets of high-level basis functions, i.e. the characteristic basis function (CBF), defined over macro domains of the object under discussion, to significantly reduce the matrix size and storage...
Transformation electromagnetics provided an effective tool to design devices that could control the electromagnetic wave with desired ray traces. However, the resulted material constitutive parameters for these devices are mostly inhomogeneous and anisotropic, which usually rely on large number of precisely defined sub-wavelength artificial structures, or metamaterials. In this paper, we show that...
This paper presents the design, simulation and measurement of a chiral metamaterial with double spiral unit cell structure that can be used to convert the polarization states of linearly polarized electromagnetic (EM) wave. The metamaterial is composed of a dielectric slab sandwiched by a double spiral metallic structure. By full-wave EM simulations and free space measurements, a strong polarization...
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