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A new accurate hybrid SBR/MoM method is presented in this paper. It considers the interaction in MoM region by calculating the near scattered field instead of the conventional multi-bounce field from SBR region. By applying the SBR method, the near scattered field from SBR region impact on the MoM region is calculated and it finally contributes to the modified excitation vector in MoM matrix equation...
A new efficient hybrid technique is presented, which combines the method of moments (MoM) and the shooting and bouncing ray (SBR) for analyzing scattering of complex large structures. By applying the SBR method for the whole structures, a corrected incident field including not only the direct incident field but also the multi-bounce field from the SBR region contributes to the integral equation in...
A comparative study on different singularity extraction techniques of Electric Field Integral Equation (EFIE) is presented Three types of methods which are the Duffy transform, projection integration and the analytic integration are implemented and compared Numerical results show the differences in the efficiency, memory usage and the accuracy of three methods. Furthermore, the best choice of the...
A hybrid technique combining the multi-level fast multipole algorithm (MLFMA) and the physical optics (PO) is presented for analyzing scattering and radiation by electrically large structures. Based on the previously proposed hybrid technique, an extra oct-tree structure is built for the MoM region to accelerate the solving process. What is more, an iteration scheme is proposed to further enhance...
This paper introduces a new PO-MoM hybrid method based on the equivalence principle for the object that can be decomposed into different isolated parts. Each part can be solved by MoM or PO according to its local property. The unknowns on every subscatterer are transferred to its surrounding equivalent surface with a new scheme, and the intersections between different parts are also considered by...
In this paper, a novel improved PMCHWT equations are developed to achieve fast and accurate solution of electromagnetic scattering from 3-D homogeneous dielectric objects. By adding the current operator into the existing PMCHWT operator, a well-conditioned improved PMCHWT matrix is achieved. The initial guess of the currents and update process are required for reasonable accuracy and convergence performance...
A hybrid technique combining the multilevel fast multipole algorithm (MLFMA) and the physical optics (PO) is presented for analyzing scattering and radiation by electrically large structures. In this technique, MLFMA is used to characterize the complex parts such as antennas that cannot be analyzed by high-frequency asymptotic methods. The large smooth bodies are calculated using PO method because...
This paper proposes a strict ray-based shadowing rule to compute the visibility between two facets in the iterative physical optics (IPO) method. This computation is further accelerated through the kd-tree structure to reduce the number of intersection tests between a ray and facets. Compared with previous IPO with a simplified shadowing rule, the proposed method is more efficient, accurate, and stable.
Real coded genetic algorithms (RCGAs) have been widely studied and applied to deal with continuous optimization problems for years. However, how to improve the degree of accuracy so as to produce high quality solutions is still one of the main difficulties that RCGAs face with. This paper proposes a novel mutation scheme for RCGAs. The mutation operator is defined as a linear map in the space of chromosomes...
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