The Message Passing Interface implementation ensures a reduction of the computing time and a distribution of the necessary memory to each processor. The 3D full-wave model for electromagnetic scattering from forest en...
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ISBN:
(纸本)9781509028863
The Message Passing Interface implementation ensures a reduction of the computing time and a distribution of the necessary memory to each processor. The 3D full-wave model for electromagnetic scattering from forest environment, based on the volumetric integral Equation formulation of the electric field, combined with the characteristic basis function method (CBFM) and implemented in Message Passing Interface (MPI) parallelization is described in this paper. This combination of the CBFM and the method of Moments (MoM) allows us to reduce significantly the size of the initial electromagnetic scattering problem.
The propagation of electromagnetic waves through ceramics and composite materials is investigated in this work. The design of complex artificial materials has potential as a valuable tool for application to many new d...
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The propagation of electromagnetic waves through ceramics and composite materials is investigated in this work. The design of complex artificial materials has potential as a valuable tool for application to many new devices, such as high-resolution lenses and electromagnetic imaging devices, as well as for the improvement of currently existing ones. A technique is demonstrated for the characterization of ceramics and other dielectrics, at terahertz frequencies, with the use of terahertz time-domain spectroscopy (THz TDS). Composite materials comprised of complex scatterers, and in particular spherical resonators, are studied using the same system. In order to calculate the scattered fields from a large number of resonant spheres, a new technique is developed, based on the characteristic basis function method (CBFM). This technique improves the computational speed of the calculation, as well as allowing the solution of bigger scattering problems, with a larger number of larger sized spheres. Finally, a technique is developed that allows the characterization of an anisotropic material, at any angle of incidence, to provide all the material tensor coefficients of the material of interest. The material tensors of effective media are related to the structure of the medium's lattice, and the importance of symmetry in the structure is demonstrated. A procedure is demonstrated that allows one to verify that the retrieved parameters are indeed those of the bulk material, by comparing eigenvectors of the extracted extit{T}-matrices. The procedure reveals that for many complex materials, such as dielectric resonators arrays, effective medium approximations do not apply, and so calculation techniques such as the CBFM, or the finite-difference time-domain method must be used to correctly determine the behavior of a composite.
In order to improve the efficiency of characteristic basis function method for analyzing the monostatic scattering problems, the principal component analysis (PCA) is used to compress the excitation matrix, then the n...
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ISBN:
(纸本)9781728181813
In order to improve the efficiency of characteristic basis function method for analyzing the monostatic scattering problems, the principal component analysis (PCA) is used to compress the excitation matrix, then the number of the matrix equation solutions is reduced because of the reduced number of excitation. Secondly, a merged characteristicbasisfunctions (CBFs) method is proposed by considering the mutual interaction among adjacent blocks. The number of matrix equation solutions and the number of CBFs are both reduced by using proposed method. Numerical examples verify and demonstrate that the proposed method is accuracy and efficiency.
This paper describes the PMCHWT-characteristic basis function method (CBFM) to analyze the scattering characteristics of a microstrip array antenna. The PMCHWT-CBFM is an effective numerical method in terms of memory ...
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ISBN:
(纸本)9781479924318
This paper describes the PMCHWT-characteristic basis function method (CBFM) to analyze the scattering characteristics of a microstrip array antenna. The PMCHWT-CBFM is an effective numerical method in terms of memory consumption. To validate the effectiveness of the PMCHWT-CBFM, we analyzed the monostatic radar cross section characteristics of a 64-element microstrip array antenna, which is considered as the terminal condition, using the PMCHWT-CBFM and conventional PMCHWT. Both results agreed well with each other;thus, the effectiveness was verified.
In this paper, the characteristicbasisfunctionmethod (CBFM) is applied to instead of conventional MOM for MLFMA implementations. CBFM includes the mutual coupling effects among different subdomains directly by ...
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ISBN:
(纸本)9781424438631;9781424438624
In this paper, the characteristicbasisfunctionmethod (CBFM) is applied to instead of conventional MOM for MLFMA implementations. CBFM includes the mutual coupling effects among different subdomains directly by constructing the high level basisfunctions, Use of these basisfunctions leads to a significant reduction in the number of unknowns, and results in a substantial size reduction of the coupling matrix;This reduces matrix size improves the convergence properties. The MLFMA is introduced to speed up the matrix-vector multiplications. The advantages of applying the CBFM with MLFMA are illustrated with numerical simulation. The results demonstrate the efficiency and accuracy of the proposed method.
In this paper, the characteristic basis function method (CBFM) is applied to instead of conventional MOM for MLFMA implementations. CBFM includes the mutual coupling effects among different subdomains directly by cons...
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In this paper, the characteristic basis function method (CBFM) is applied to instead of conventional MOM for MLFMA implementations. CBFM includes the mutual coupling effects among different subdomains directly by constructing the high level basisfunctions, Use of these basisfunctions leads to a significant reduction in the number of unknowns, and results in a substantial size reduction of the coupling matrix;This reduces matrix size improves the convergence properties. The MLFMA is introduced to speed up the matrix-vector multiplications. The advantages of applying the CBFM with MLFMA are illustrated with numerical simulation. The results demonstrate the efficiency and accuracy of the proposed method.
In this paper, an improved singular value decomposition-characteristic basis function method (SVD-CBFM) is proposed to efficiently solve multiple incident excitations electromagnetic scattering. ACA-SVD is applied to ...
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ISBN:
(纸本)9781538616093
In this paper, an improved singular value decomposition-characteristic basis function method (SVD-CBFM) is proposed to efficiently solve multiple incident excitations electromagnetic scattering. ACA-SVD is applied to compress incident excitations to accelerate the generation of CBFs instead of compressing the CBFs in the conventional SVD-CBFM. The numerical example demonstrates that the proposed method is more efficiency than the conventional SVD-CBFM under the same precision conditions.
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