Abstract
In this paper, we present a multifunctional metasurface (MS) to manipulate electromagnetic wave in the entire-space. First, we propose a MS unit structure which consists of four elaborately designed metal patterns separated by three substrate layers. Through changing the structures of metal layer 2 and layer 4, two different 1-bit units for transmission and reflection modes are obtained. By combining these two working modes together, the proposed MS can adjust the transmitted and reflected phases respectively in the upper and lower half-spaces. Thus we demonstrate some intriguing electromagnetic modulation functions in the entire-space, such as beam forming, anomalous reflection and diffusion. The simulated and experimental results prove that our method offers a feasible strategy for multifunctional MS design and other related practical applications.
Highlights
Metasurfaces (MS) are normally defined as twodimensional metamaterials constructed with a periodic arrangement of subwavelength metallic or dielectric inclusions.1 MS have triggered great interests due to their potential ability of arbitrary manipulation of electromagnetic (EM) wave propagation.2–9 Till plenty of fascinating EM phenomena have been generated using MS such as anomalous refraction/reflection,10–14 polarization rotation,15–19 and surface wave conversion.20–26The advent of multifunctional MS has aroused intensively interests quite recently
Metal layer 4 is to control the phases of the reflected EM wave
The reflection coefficient curves from 3GHz to 18GHz are basically close to 0dB which demonstrates that y-polarized EM wave irradiating from –z direction are completely reflected by MS unit cells
Summary
Metasurfaces (MS) are normally defined as twodimensional metamaterials constructed with a periodic arrangement of subwavelength metallic or dielectric inclusions. MS have triggered great interests due to their potential ability of arbitrary manipulation of electromagnetic (EM) wave propagation. Till plenty of fascinating EM phenomena have been generated using MS such as anomalous refraction/reflection, polarization rotation, and surface wave conversion.. Coding MS have a great application prospect in reflection and transmission array These two methods effectively promoted the development of multifunctional MS. In Ref. 37 and 38, the MS can attain polarization conversion for reflected wave and anomalous refraction for transmitted wave in the entire-space. Diffusion and low scattering properties can be achieved by optimizing the coding sequences in reflection mode. Both simulations and measurements prove that the MS can be used to manipulate EM wave in the entire-space. Different with traditional transmission array, the proposed MS provides a new way in the applications of low scattering transmission array antennas and target stealth domain
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