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Single-layer phase gradient mmWave metasurface for incident angle independent focusing
Wonwoo Lee1, Semin Jo1, Kanghyeok Lee1
1Department of Information Communication Convergence Technology, Soongsil University, Seoul, 0678, South Korea.
Scientific Reports
|June 17, 2021
Summary
This study presents a novel single-layer metasurface lens for millimeter-wave focusing. The flat, compact device achieves high-performance focusing independent of incident angle and across a wide frequency range.
Area of Science:
- Electromagnetics and Optics
- Materials Science
Background:
- Metasurfaces enable compact, flat electromagnetic devices by manipulating electromagnetic waves.
- Metasurface lenses require wide operational bandwidth and wide incident angle performance for practical use.
Purpose of the Study:
- To present a single-layer phase gradient metasurface lens for millimeter-wave focusing.
- To achieve focusing independent of incident angle and over a broad frequency range.
Main Methods:
- Fabrication of a subwavelength-thick (< 009λ/10) metasurface lens.
- Utilized phase elements composed of two metallic layers and a dielectric substrate.
- Controlled spatial phase distribution for wavefront manipulation.
Main Results:
- Achieved millimeter-wave focusing at a 13 mm focal point.
- Demonstrated incident angle independency up to 30°.
- Exhibited high-performance focusing over a wide operating frequency range (35–40 GHz).
Conclusions:
- The proposed metasurface lens offers low-Q resonance and a wide phase modulation range with satisfactory transmissivity.
- The design enables effective wavefront manipulation and high-performance electromagnetic wave focusing.
- The device is suitable for practical applications requiring angle and bandwidth independence.
