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Scattering by rotationally symmetric anisotropic spheres: potential formulation and parametric studies
Cheng-Wei Qiu1, Le-Wei Li, Tat-Soon Yeo
1Department of Electrical and Computer Engineering, National University of Singapore, Kent Ridge, Singapore 119260.
Summary
Material anisotropy significantly impacts electromagnetic scattering from spheres. For absorbing spheres, radar cross section (RCS) can be greatly reduced by controlling electric (Ae) and magnetic (Am) anisotropy parameters.
Area of Science:
- Electromagnetics and wave propagation.
- Computational physics and numerical methods.
Background:
- Electromagnetic scattering from anisotropic objects is complex.
- Understanding material property effects on scattering is crucial for applications.
Purpose of the Study:
- To investigate electromagnetic scattering of rotationally symmetric anisotropic spheres.
- To analyze the influence of electric (Ae) and magnetic (Am) anisotropy ratios on radar cross section (RCS).
Main Methods:
- Vector potential formulation for electromagnetic fields.
- Derivation of TE/TM modes using fractional-order Ricatti-Bessel functions.
- Parametric studies of scattering behavior with varying Ae and Am.
Main Results:
- Material anisotropy significantly affects scattering from dielectric spheres.
- Anisotropic effects are less pronounced in absorbing spheres, with predictable RCS dependence.
- Hybrid effects of Ae and Am allow for significant RCS reduction in absorbing spheres.
Conclusions:
- Anisotropy is a key factor in electromagnetic scattering phenomena.
- Controlling material parameters offers a method for managing RCS.
- The study provides a theoretical and numerical framework for analyzing anisotropic scattering problems.
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