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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...
In this paper, a single-layer transmission-type metasurface is proposed to generate vortex beams and converge the beam in microwave region. Utilizing the abrupt phase changes introduced by the unit cells, the required phase differences accumulated along the propagation path in conventional optical lens can be easily achieved, resulting in a planar structure of the proposed microwave lens. The results...
An ultrathin flat metasurface experimentally realizing bi-functional microwave manipulation has been demonstrated to be able to approach the theoretical limit of cross-polarization (cross-pol) conversion efficiency of the transmission. With the excitation of a localized waveguide mode, an abrupt helicity-dependent phase change is introduced to the transmission and can be engineered by assembling the...
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