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In this paper, a planar metasurface operating in microwave region to generate Bessel beam carrying orbital angular momentum (OAM) is proposed. The beam generator is realized by utilizing the abrupt phase changes at the interface of the metasurface, instead of the gradual phase differences in the optical lenses. The proposed planar metasurfaces are designed and simulated respectively, and the results...
This work describes a modified approach for extracting the equivalent circuit parameters, as there are the resonant frequency of each resonator, the coupling bandwidths and the external Qs from multi-port Y-matrix and group delay of the input reflection coefficients. The extractions of equivalent circuit parameters and the fine tuning for three-dimensional simulating models are achieved by utilizing...
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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