Generation of Broadband Dual Tilted Bessel Beams with Polarization Conversion Metasurface

In this paper, broadband dual tilted Bessel beams with the aid of a polarization conversion meta-surface is generated. The transmission meta-surface consists of 32*32 subwavelength unit cells, which can effectively convert incident linear polarized wave to zero order Bessel beam with different direction based on time reversal. The designed three-layer unit cell combining mirrored and size changed approach can meet the need of full 360° phase coverage from 10GHz to 18GHz with high transmission magnitude (>0.9). The developed dual Bessel beams propagate along the $\mathrm{e}=30^{\mathrm{o}}, \varphi=45^{\mathrm{o}}$ and $\Theta=-30_{J}\varphi=180^{\mathrm{o}}$.And their simulated magnitude distributions in near field are provided.