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As an effective approach for manipulating propagation of waves, transformation optics has inspired many novel applications during past decades. In this paper, our recent efforts in metamaterial devices for manipulation of waves in microwave region are reviewed with emphasis on (1) multifunctional device with three different kinds of electromagnetic properties, (2) homogeneous illusion device exhibiting...
In this work, a metamaterial resonator based on complementary split ring resonator (CSRR) loaded with square open-loop resonator (OLR) is presented theoretically and experimentally. It is shown through equivalent circuit model that the addition of OLR to the conventional CSRR-loaded cell generates transmission zero in the upper stop band and improves the upper band rejection level without increasing...
In this paper, recent works of metasurface in microwave region are reviewed. First, ultra-thin metasurface based on phase discontinuity is introduced. Different spatial phase functions are adopted to achieve manipulation of wavefront, including bi-polarization metalens and orbital angular momentum. Second, metasurface based on transformation optics is studied. A four-beam antenna is constructed based...
A broadband two-dimensional Luneburg lens is presented based on gradient index metamaterials. The focusing condition of the lens, requiring a gradient refractive index, is achieved by using the electromagnetic resonators. A novel modified split ring resonator is chosen as the unit cell since its permeability and permittivity can keep constants when the operating band is far away from the resonant...
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