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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...
In this work, the authors proposed a new method for the above field calculation, which utilizes the analytical expression for the near fields radiated by an electrically small dipole. The proposed method is found to be well suited for mitigating the problem of singularities encountered in the process of field computation while constructing the MoM matrix.
In this paper, we present a method to accurately and efficiently compute the radiation from a numerically-defined set of currents represented in terms of a modified version of the classical rooftop basis functions. The shape of the scatterer is completely arbitrary and may be defined by NURBS surfaces [4], Since a NURBS representation is used in most of the CAD design software, this formulation enables...
The paper presents a new dipole-moment-based approach for formulating MoM-type problems. The method is universal in nature and it applies equally well to PEC and dielectric objects. The dipole moment (DM) formulation neither suffers from the singularity problem associated with the Green's functions, nor does it experience any difficulties at low frequencies, as do the conventional MoM formulations.
Specific absorption rate (SAR) is an important measure for evaluating cell phones and other electronic devices. The IEEE Standard 1528 does not give a detailed description of simulation parameters to be used in the FDTD method. In this paper, we attempt to fill this gap by providing a detailed description of the FDTD evaluation of the SAR by using the configuration given in IEEE Standard 1528.
This letter presents an interpolation algorithm to reduce the computation time needed to generate the reduced matrix in the characteristic basis function method (CBFM). The first step in this approach is to identify the observation points and calculate the electric fields at those points that are produced by the induced currents represented by the macro basis functions (MBFs) called the characteristic...
A new efficient technique for calculating the reaction between characteristics basis functions has been presented. The proposed method enables us to bypass the computation of the off-diagonal of the MoM matrix. For the case of contiguous blocks, an efficient hybrid approach has been developed that combines the conventional MoM matrix approach with the interpolation technique. Numerical results show...
In this paper we determine the weights of the spatial harmonics in a periodic structure, with quasi-periodicity along the propagation direction, by detailed analysis of the fields inside the unit-cells. We use both the Pronypsilas method and Fourier transform to extract the spectrum of the fields inside the unit cells along the propagation direction and compare the results obtained by each method...
This paper presents a novel and systematic approach for enhancing the directivity of an antenna/EBG composite, comprising of a microstrip patch antenna covered by an FSS superstrate. The method is based on the initial simulation of the composite operating in the receive mode, mapping the field distribution in the Fabry-Perot type cavity region formed by the superstrate and the ground plane. Additionally,...
This paper presents an interpolation scheme to reduce the computation time needed to generate the reduced matrix in the Characteristic Basis Function Method (CBFM). The first step in this approach is to identify the observation points and calculate the electric fields at those points that are produced by the induced currents represented by the macro-basis functions called the Characteristic Basis...
We have presented herein a procedure for the generation of high-level Characteristic Basis Functions by using a chained SVD-based technique. The proposed method reduces the overall number of basis functions to be considered for the generation of the reduced matrix and, furthermore, it is very well suited for combining it with a CBFM-MLFMA implementation, because of the similarities between the hierarchical...
Results of in vitro studies on EM field risks provide the most convincing evidence of direct RF exposure effects on biological cells, even if the mechanisms for such effects remain uncertain [1-2-3].
In this work we present a novel approach to constructing the layered medium Green's function using the BOR (body of revolution) version of the FDTD, which has several desirable attributes: (a) It poses no difficulty when handling n-layer problems, even when n is large; (b) it is easy to analyze lossy layers, including RAM materials; (c) the location of the observation point can be arbitrary in terms...
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