研究目的
To evaluate the effective permittivity and permeability of a medium consisting of an infinite number of ferromagnetic microwires for arbitrarily incident uniform plane waves with arbitrary polarization angles.
研究成果
The medium formed by a ferromagnetic microwire grid behaves as a DNG medium for a frequency band of 5–10 GHz only for T Mz polarization. For other polarizations, the real part of effective permittivity and permeability are not negative simultaneously. The proposed method provides a more comprehensive analysis compared to existing literature, enabling evaluation of effective permittivity and permeability for arbitrary polarizations and oblique incidence.
研究不足
The analysis assumes the radius of the microwire is much smaller than the wavelength, which may not hold for all practical applications. The study is limited to numerical simulations and lacks experimental validation.
1：Experimental Design and Method Selection:
The analysis is based on local and average field components within a unit cell of the ferromagnetic microwire grid. The method involves evaluating the diagonal components of tensor effective permittivity and permeability for different polarizations and incident angles.
2：Sample Selection and Data Sources:
The study uses a Cobalt based ferrite microwire grid with specific parameters: radius a = 1 μm, conductivity σ = 6.7 × 105 S/m, gyromagnetic ratio γ = 2 × 1011 T?1 s?1, saturation magnetization μ0Ms = 0.55 T, magnetic loss factor δ = 0.02, internal magnetization H0 = 113.45 kA/m along the z-coordinate, and an operating frequency band of 5–15 GHz.
3：7 × 105 S/m, gyromagnetic ratio γ = 2 × 1011 T?1 s?1, saturation magnetization μ0Ms = 55 T, magnetic loss factor δ = 02, internal magnetization H0 = 45 kA/m along the z-coordinate, and an operating frequency band of 5–15 GHz.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials:
The study involves numerical simulations performed using MATLAB.
4：Experimental Procedures and Operational Workflow:
The analysis involves calculating the scattering field coefficients for a generalized case of scattering from a ferromagnetic microwire grid, then using these to obtain the effective permittivity and permeability of the medium.
5：Data Analysis Methods:
Numerical results are obtained for the principal diagonal components of the tensor effective permittivity and permeability for T Mz, T Ez, and arbitrary polarizations at an angle of incidence θ0 = 45?. The results are compared with existing literature for validation.
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