title: Frequency-controls of electromagnetic multi-beam scanning by metasurfaces.
abstract: We propose a method to control electromagnetic (EM) radiations by holographic metasurfaces, including to producing multi-beam scanning in one dimension (1D) and two dimensions (2D) with the change of frequency. The metasurfaces are composed of subwavelength metallic patches on grounded dielectric substrate. We present a combined theory of holography and leaky wave to realize the multi-beam radiations by exciting the surface interference patterns, which are generated by interference between the excitation source and required radiation waves. As the frequency changes, we show that the main lobes of EM radiation beams could accomplish 1D or 2D scans regularly by using the proposed holographic metasurfaces shaped with different interference patterns. This is the first time to realize 2D scans of antennas by changing the frequency. Full-wave simulations and experimental results validate the proposed theory and confirm the corresponding physical phenomena.
authors.affiliation: State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing 210096, China.
authors.forename: Yun Bo
authors.initials: YB
authors.lastname: Li
authors.affiliation: State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing 210096, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Wan
authors.affiliation: State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing 210096, China.
authors.forename: Ben Geng
authors.initials: BG
authors.lastname: Cai
authors.affiliation: State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing 210096, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Cheng
authors.affiliation: State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing 210096, China.
authors.forename: Tie Jun
authors.initials: TJ
authors.lastname: Cui