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Compact folded dipole metasurface for high anomalous reflection angles with low harmonic levels
1Department of Electrical Engineering, University of Ulsan, Ulsan, 44610, Korea.
Scientific Reports
|October 23, 2020
Summary
Compact metasurfaces using folded dipole unit cells achieve high reflection angles with reduced parasitic reflections and lower harmonic levels. This design offers a practical solution for millimeter-wave communication links.
Area of Science:
- Electromagnetics
- Metamaterials
- Antenna Theory
Background:
- Dense unit cell arrays in metasurfaces for high reflection angles cause significant coupling and parasitic reflections.
- Existing patch-based metasurfaces for high reflection angles are electrically large, limiting practical applications.
- A need exists for compact metasurface designs that maintain high reflection performance.
Purpose of the Study:
- To design and demonstrate compact metasurfaces capable of high reflection angles using folded dipole unit cells.
- To investigate the reduction of parasitic reflections and harmonic levels compared to conventional patch-based metasurfaces.
- To evaluate the suitability of the proposed metasurface for millimeter-wave communication links.
Main Methods:
- Utilized folded dipole unit cells with closed-loop currents to minimize near-field coupling.
- Arranged unit cells based on a non-linear phase boundary condition to suppress harmonic reflections.
- Designed and experimentally validated compact metasurfaces (approx. 40 λ²) for reflection angles of 56° and 70° at 10 GHz.
- Compared performance against a conventional patch-shaped metasurface with identical reflection phases.
Main Results:
- The folded dipole metasurface exhibited lower harmonic levels (0° and -70°) compared to the patch-shaped metasurface.
- Anomalous reflection at 70° was comparable between the folded dipole and patch-shaped metasurfaces.
- Time-domain analysis indicated reduced scattering from guided waves and edge scattering in the folded dipole design, contributing to lower harmonics.
Conclusions:
- Compact folded dipole-based metasurfaces offer a viable solution for high reflection angles with reduced parasitic effects.
- The proposed design achieves low undesired harmonic reflections, enhancing practical applicability.
- This technology holds promise for developing practical reflect-arrays in millimeter-wave communication systems.
