Abstract
In this paper, the wavefront characteristics of Orbital angular momentum (OAM) wave after transmitting glasses with different thicknesses at 30 GHz are investigated. Through full-wave simulation and measurement, the wavefront distribution of OAM wave passing through various glasses are recorded. From the perspective of amplitude, it is found that when the glass thickness increases, the amplitude attenuation of the OAM wave increases, which is greater than the theoretical attenuation constant. From the perspective of phase, the mode purity of OAM wave decreases with the increase of glass thickness, but the vortex state can still be well maintained.
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