Ultra-thin single-layer transparent geometrical phase gradient metasurface and its application to high-gain circularly-polarized lens antenna

Abstract

A new method to design an ultra-thin high-gain circularly-polarized antenna system with high efficiency is proposed based on the geometrical phase gradient metasurface (GPGM). With an accuracy control of the transmission phase and also the high transmission amplitude, the GPGM is capable of manipulating an electromagnetic wave arbitrarily. A focusing transmission lens working at Ku band is well optimized with the F/D of 0.32. A good focusing effect is demonstrated clearly by theoretical calculation and electromagnetic simulation. For further application, an ultra-thin single-layer transmissive lens antenna based on the proposed focusing metasurface operating at 13 GHz is implemented and launched by an original patch antenna from the perspective of high integration, simple structure, and low cost. Numerical and experimental results coincide well, indicating the advantages of the antenna system, such as a high gain of 17.6 dB, the axis ratio better than 2 dB, a high aperture efficiency of 41%, and also a simple fabrication process based on the convenient print circuit board technology. The good performance of the proposed antenna indicates promising applications in portable communication systems.

High-efficiency dual-modes vortex beam generator with polarization-dependent transmission and reflection properties

“…Different from currently reported vortex beam generator 1 – 16 , our design can not only realize vortex beams with different topological charges, but also with very high efficiencies, which results from the independent manipulation of vortex beams based on the polarization-dependence of the metasurfaces. To ensure a compact structure, we excite the metasurface with a self-made Vivaldi antenna, which can radiate quasi-spherical waves at a wide frequency range 49 . Thus, the metasurface should incorporate two distinct phase profiles of a lens and a vortex plate, which can be calculated as with F 1 and F 2 being two focal lengths which can be chosen freely and arbitrarily, m 1 and m 2 denoting the topological charges which are integers.…”

Ultra‐broadband function‐integrated stealth antenna based on asymmetric transmission metasurface

“…Simply adopting traditional stealth technologies is difficult to effectively achieve the in‐band low RCS effect of the antenna. Since the emergence of metasurface (MS), 1–10 due to its powerful ability to manipulate EM waves, 11–14 it has shown great advantages compared with traditional antenna design techniques in the domain of antenna function integration and stealth 15–20 . In recent years, MS has provided a new method for the design and implementation of function‐integrated stealth antenna and achieved fruitful results.…”

“…Since the emergence of metasurface (MS), [1][2][3][4][5][6][7][8][9][10] due to its powerful ability to manipulate EM waves, [11][12][13][14] it has shown great advantages compared with traditional antenna design techniques in the domain of antenna function integration and stealth. [15][16][17][18][19][20] In recent years, MS has provided a new method for the design and implementation of function-integrated stealth antenna and achieved fruitful results. Exciting the multifunctional MS by Vivaldi antenna, the designed MS antenna can integrate the transmission array antenna and the reflection array antenna, but the radiation bandwidth of the antenna is narrow and the stealth performance of the antenna is not considered.…”

Design of Ultra-wideband Low RCS Reflecting Screen Based on Phase Gradient Metasurface

“…The emergence and development of Electromagnetic Material (EM) undoubtedly opens the door of new stealth technology. Left Handed Material (LHM) [12], [13], Electromagnetic Band Gap (EBG), Frequency Selective Surface (FSS), Artificial Magnetic Conductor (AMC), Phase Gradient Metasurface (PGM) [14][15][16] and other new EMs arise at the historic moment. Among them, PGM has attracted much attention because of its unique characteristics of abnormal refraction.…”