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Single-Layer Phase Gradient mmWave Metasurface Lens for Incident Angle Independent Focusing
Lee Wonwoo,Jo Semin,Kim Yongchan,Choi Keun-Yeong,Yun Eseudeo,Lee Ryungyu,Moon Jinho,Kim Hyunwoo,Lee Hojin 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
Metasurfaces allow the rapid development of flat electromagnetic devices owing to their ability in exploiting the wavefront of electromagnetic waves. Particularly, with respect to the metasurface lenses, wide operating bandwidth and wide incident angle characteristics are critical features for practical applications. Herein, a single-layer phase gradient metasurface lens is presented to realize millimeter-wave focusing at a focal point of 13 mm regardless of the incident angle. The proposed metasurface lens is designed with subwavelength-thick (<λ/10) phase elements composed of two metallic layers separated by a single dielectric substrate that exhibits low-Q resonance properties and a wide phase modulation range with satisfactory transmissivity. By controlling the spatial phase distribution, the proposed metasurface lens realizes effective wavefront manipulation properties and high performance electromagnetic wave focusing characteristics over a wide operating frequency range from 35 to 40 GHz with incident angle independency up to 30°.