研究目的
To propose and numerically investigate ultrathin microwave devices for polarization-dependent wavefront shaping based on an anisotropic metasurface, enabling independent manipulation of x- and y-polarized wavefronts at 15 GHz with high efficiency.
研究成果
The proposed ultrathin anisotropic metasurface successfully enables independent manipulation of x- and y-polarized wavefronts at 15 GHz with high efficiency (reflective efficiency up to 0.98). Proof-of-concept designs for a polarization beam splitter and a focusing metasurface demonstrate its potential for microwave applications, such as wireless communication, despite limitations in phase coverage and coupling effects.
研究不足
The reflective phase coverage is limited to 320°, not a full 360°, which may cause deviations in wavefront manipulation. Coupling effects between neighboring unit cells can lead to inaccuracies in simulated results compared to theoretical designs. The study is based on numerical simulations without experimental validation, and practical fabrication challenges are not addressed.
1：Experimental Design and Method Selection:
Numerical simulations using CST Microwave Studio to design and analyze an anisotropic metasurface composed of a square metal ring with a cross resonator, dielectric substrate, and metal ground plane. The design is based on the double-phase modulating mechanism for independent control of x- and y-polarized waves.
2：Sample Selection and Data Sources:
The unit cell and metasurface arrays are designed with specific geometric parameters (e.g., p = 7 mm, w = 1.2 mm, w1 = 0.2 mm, dx and dy varied from 4 mm to 6.5 mm). The dielectric substrate is FR4 with relative permittivity of 4.3 and loss tangent of 0.001; metal is approximated as a perfect electric conductor.
3：2 mm, w1 = 2 mm, dx and dy varied from 4 mm to 5 mm). The dielectric substrate is FR4 with relative permittivity of 3 and loss tangent of 001; metal is approximated as a perfect electric conductor.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Simulation software CST Microwave Studio (2015 version), computational resources for electromagnetic simulations.
4：Experimental Procedures and Operational Workflow:
Set periodic and absorbing boundary conditions in simulations; illuminate with plane waves along the z-axis with x- and y-polarization; optimize geometric parameters to achieve desired phase and amplitude responses; design and simulate metasurface arrays for beam splitting and focusing applications.
5：Data Analysis Methods:
Analyze reflective coefficient S11 (amplitude and phase), near-field electric field distributions, return loss, and focusing performance using built-in tools in CST Microwave Studio.
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