Frequency scanning non-diffraction beam by metasurface

A reflective metasurface that can form a non-diffraction beam is proposed in this article. This metasurface is designed based on the artificial admittance modulation surface, and the metallic square patch on the grounded dielectric substrate is utilized to construct the whole surface. The beam can change its propagation direction with the change of frequency and have good non-diffraction characteristics. The metasurface is fabricated, and the measurement results demonstrate good performance of generating non-diffraction beams.