研究目的
To suppress the transformation optics cloaking singularities by proposing a mechanism-based method that uses a scattering cancellation cloaked circle as the virtual space for transformation, aiming for non-singular constitutive parameters and reduced variation range.
研究成果
The proposed mechanism-based technique successfully suppresses singularities in transformation optics cloaks, achieving non-singular constitutive parameters and reduced variation range, as validated numerically, bringing practical implementation closer.
研究不足
The method relies on numerical simulations and may have constraints in practical implementation due to material requirements; bandwidth and loss aspects are not fully addressed.
1：Experimental Design and Method Selection:
The method involves a coordinate transformation from a virtual space with a low-scattering small circle (implemented via scattering cancellation using a cylindrical metasurface) to a real space, based on the invariance of Maxwell's equations.
2：Sample Selection and Data Sources:
A metallic cylindrical obstacle of specific radii (e.g., λ, 3λ) is used, with cloaking layers defined by transformation optics.
3：List of Experimental Equipment and Materials:
COMSOL Multiphysics software for numerical simulations; metasurfaces with specified sheet impedances (e.g., Zs = -j93Ω for isotropic cloak).
4：Experimental Procedures and Operational Workflow:
Numerical simulations are conducted using COMSOL Multiphysics at 2GHz frequency, with plane wave incidence, to compute total and scattered electric fields.
5：Data Analysis Methods:
Field amplitudes are analyzed on circular paths at specified distances, and constitutive parameters are compared between conventional and proposed methods.
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