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An integral equation with non-conformal and non-overlapping domain decomposition method has aroused wide interest in the engineering community. The contribution of this paper is twofold: (I) In the framework of IE-DDM, phase-extracted (PE) basis function is employed to reduce the required number of unknowns in the large and smooth sub-domain. (II) A reverse operation self-consistent evaluation (ROSE)...
In this paper, a surface integral equation domain decomposition method (SIE-DDM) with phase extracted (PE) basis function is presented for the solution of electrically large problems. This kind of basis functions with the traveling wave variation can be defined on the relative large grids. so they are suitable for the decomposed smooth large subdomains to further reduce the required number of unknowns...
In this paper, a hybrid volume-surface electric field integral equation approach is developed to calculate the electromagnetic scattering from planar thin dielectric structures (dielectric materials or composite conductor-dielectric objects). The volume integral equation (VIE) is used for thin dielectric layers. To reduce the number of unknowns and accelerate the solution, the prism elements are employed...
A non-conforming and non-overlapping domain decomposition preconditioning method based on the surface integral equations is presented for analyzing electromagnetic scattering from electrically large perfect electric conducting (PEC) objects. A new consistency term is introduced in the discontinuous Galerkin electric field integral equation by means of the interior penalty approach in time-harmonic...
An efficient preconditioner for analysis of electromagnetic scattering and radiation of the composite dielectric and thin conductive plate objects is proposed in this paper. In the conventional method, metal and dielectric are generally considered to be independent to each other. Therefore the accuracy of the solution cannot be guaranteed, when dealing with radiation problems. While the traditional...
A modified model is presented to simulate the electromagnetic properties of the conformal capacitive frequency selective surfaces (FSSs). By employing a duel set of quasi-orthogonal rooftop basis functions for the surface current distribution over the FSSs conducting surface, the conditioning of the system matrix is significantly improved without decreasing the solution accuracy or increasing the...
The nonconformal domain decomposition method (DDM) of the hybrid finite element-boundary element(BEM) with FETI (finite element tearing and interconnecting) like algrithm and multilevel fast multipole algorithm (MLFMA) are presented for computing large electromagnetic scattering problems in this paper. Due to the Robin-type transmission conditions, it is possible to employ nonconformal interface discretizations...
A novel passive feeding network is proposed to achieve isolation enhancement for the dual-polarized antenna in this paper. The proposed feeding network is composed of two 50 ohm transmission lines, a rectangular loop with an open-ended and another two short-circuited transmission lines. Compared with the antenna without this feeding network, the simulated results show that the isolation improvement...
A novel dual-polarized antenna with low profile and high port isolation is proposed in this paper. The proposed antenna consists of two dipoles perpendicular with each other. One dipole is composed of a pair of trapezoidal patches with four triangular parasitic patches, which is the same as the other one. Each trapezoidal patch has two rectangular slots. Both of the dipoles are printed on the upper...
A novel kind of hierarchical loop-flower basis function is proposed to solve the low frequency scattering problem. The hierarchical loop-flower is defined on a hierarchical mesh. The hierarchical loop basis function is used to expand the solenoidal current and the hierarchical flower basis function is used to expand the nonsolenoidal current and thus the low frequency breakdown problem can be remedied...
An integral equation with non-conformal and non-overlapping domain decomposition method has aroused wide interest in the engineering community. The contribution of this paper is twofold: (I) In the framework of IE-DDM, phase-extracted (PE) basis function is employed to reduce the required number of unknowns in the large and smooth sub-domain. (II) A reverse operation self-consistent evaluation (ROSE)...
This paper investigates influence of the regularization parameter L on the performance of subspace-based optimization method in reconstructing uniaxial anisotropic objects. Some criteria are obtained to determine the regularization parameter L. If L is too small, the cost function may not converge well. If L is too large, the noise will be amplified and deteriorate the inverse process. It is found...
Cloud cover impacts the quality of optical remote sensing images. Generally, temporal methods and inpainting methods are used to remove the clouds. The temporal methods reconstruct cloudy areas via a series of multi-temporal images, thus suffer from the assumption that the landscape does not change over a period of time. The inpainting methods fill the areas via image patches from the image itself...
Direction of Arrival (DOA) estimation of low-altitude target is a difficult problem due to the multipath coherent interference from the ground reflection, especially for meter-wave radar whose antenna is restricted severely in its aperture and height. A novel precise angle measurement for meter-wave radar based on multipath cancellation is proposed in this paper. First, combine vertical polarized...
This paper is based on the application requirements of fully polarimetric radar for near ground and sea targets detection. We have used numerical modeling based on integral equation and multilevel fast multipole algorithm to study and calculate the fully polarimetric far field scattering data of simple manmade targets in a half space to conduct radar imaging. We also have compared the differences...
Focusing on the design of the large number of antennas in massive multiple input multiple output (MIMO), this paper has proposed a configuration of the antennas for massive MIMO, and presented a possible working model based on the idea of dynamic combination of the multiple antennas and the antenna arrays. The upper limit of the number of antenna elements for beamforming in the massive MIMO system...
This work present a new aggregation procedure to improve the efficiency of the Nested Complex Source Beam (NCSB) method. The procedure is based on the application of the singular value decomposition (SVD) to the complex source beams (CSBs) aggregation matrices. The matrices, which represent the CSBs relationship between two adjacent levels, are decomposed into new combinations of the original CSBs...
When using the Method of Moment (MoM) and MLFMA to calculate the scattered field of the perfect electric conductors (PEC), it is hard to calculate monostation RCS in case of the targets with electrically extreme large size. In this paper, an efficient numerical modeling method of monostation RCS for electrically extreme large PEC targets has been proposed based on the phase extracted basis functions...
A novel set of multilevel basis functions is proposed in this paper to improve the system matrix conditioning of the radiation problem for line-fed patch antenna. The proposed basis functions are formulated in a wavelet-like manner. As a result, they possess spatial resolutions and mutual orthogonality which are significant for a well conditioning of the system matrix. Compared with the conventional...
An efficient method for analysis of electromagnetic scattering from three-dimensional objects straddling the interface of a half space has been presented. The analysis of scattering from objects within a half space has been equivalent to the analysis of scattering from composite dielectric objects in free space to enhance the computational efficiency. Different from the traditional method, the Green's...
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