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Metamaterials, with effective negative permittivity and/or negative permeability, have paid much attention in recent years. We present the results on slow light and omnidirectional resonances in the metamaterial-based structures. We have found that the group velocity vanishes in the planar and cylindrical waveguides consisting of the left-handed metamaterial core and the single-negative-permittivity...
A high gain omnidirectional monopole antenna with a metamaterial cover is proposed in this paper. We show that under proper condition the energy radiated by a source embedded in a cylinder of metamaterial will be concentrated in a narrow cone in the horizontal plane and maintain its omni-directivity in the vertical plane. The ideas developed here are applied in the microwave domain to realize a high...
A new method to improve the gain of patch antenna with metamaterial composed of ring aperture lattice is presented. A comparison between the conventional patch antenna and the new metamaterial patch antenna is given. The experimental results show that this method is effective and metamaterial structure can realize congregating the radiation energy, so the gain of the antenna with metamaterial can...
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