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This paper illustrates the use of Characteristic Mode Analysis in FEKO to synthesize a desired combined antenna pattern of multiple antennas mounted on an aircraft, and to mitigate co-site interference between antennas on an aircraft.
The purpose of this work Is to Introduce the Iterative Domain Green's Function Method (DGFM) that may be used for the analysis of large, disjoint finite antenna arrays. The iterative DGFM presents an improvement over the conventional DGFM in terms of accuracy. The convergence rate of the technique will be illustrated at the hand of an example.
This work considers the analysis of finite antenna arrays in the presence of arbitrary electromagnetic structures, e.g. a focal plane array illuminating a parabolic dish antenna, or an antenna array located above a finite sized ground plane. The fast solution approach applies domain decomposition where the finite array is considered as one domain and the remainder of the geometry as the other. Two...
Characteristic mode analysis (CMA) is an eigenanalysis technique that is particularly useful for gaining insight into the radiating properties of arbitrary electromagnetic structures. This work reviews a numerically efficient implementation for solving the generalised eigenproblem that results from separating the Method-of-Moments (MoM) impedance matrix in its real and imaginary components. Furthermore,...
In this work, antenna arrays will be analysed in the presence of ground planes that are both of finite extent. A hybrid approach between a partitioned MoM scheme called the Numerical Green's Function (NGF) and the Domain Green's Function Method (DGFM) is presented, viz., the NGF-enhanced DGFM. The method allows for computationally efficient simulations, in that various array configurations can be...
The Domain Green's Function Method (DGFM) is a Method-of-Moments (MoM) based domain decomposition approach that is useful for the analysis of large, irregular antenna arrays. Mutual coupling between array elements is accounted for with the formulation of an active impedance matrix equation for each of the domains/array elements. The active current distribution on the entire array geometry is then...
Characteristic mode analysis (CMA) is a useful design tool that enables antenna designers to follow a systematic approach for extracting the radiating properties of a structure. These properties are quantified with CMA in the form of eigenvalues and eigenvectors, i.e., the solutions of a generalised eigenvalue equation that is formulated from the Method-of-Moments (MoM) impedance matrix. One particular...
The purpose of this work is to present a quantitative comparison between three Method-of-Moments based domain decomposition techniques that are used for the analysis of large, disjoint finite antenna arrays. The methods considered are the Characteristic Basis Function Method, the Domain Green's Function Method, and a newly proposed improved version of the DGFM, i.e., the i-DGFM. The computational...
This paper considers the efficient numerical analysis of large, finite antenna arrays comprising of disjoint subarrays by using the Domain Green's Function Method (DGFM) [1] in conjunction with the Characteristic Basis Function Method (CBFM) [2]. In the CBFM-enhanced DGFM we consider large arrays consisting of multiple disjoint subarrays and impose the infinite array type assumption, i.e. that the...
This paper considers the efficient numerical analysis of large and complex electromagnetic structures by using domain decomposition techniques such as the Numerical Green's Function (NGF) [1] and the Domain Green's Function Method (DGFM) [2] in connection with hierarchical higher order basis functions [3, 4]. Both the NGF and DGFM methods are applicable to problems that can be subdivided into distinct...
This paper discusses the GPU acceleration of FEKO, a versatile commercial CEM software package. Specifically, some of the challenges in accelerating complex software with many interdepen-dencies are presented. It is shown that despite the advances made in the field of GPGPU computing, and impressive speedups for parts of a program or simplified problems, there are a number of factors to consider before...
One of the results of the ACE benchmarking activity was a paper in the AP Magazine in 2009, where a commercially available GSM antenna was benchmarked with six simulation tools. The results were revealing. This structure showed a quite astonishing dispersion in the simulated results. However, there were some issues left uncovered. This year, within the yearly benchmarking cycle of the EuRAAP Working...
This paper considers the efficient numerical analysis of arbitrary finite antenna array structures using the Domain Green's Function Method (DGFM). The DGFM is implemented in the comprehensive 3D electromagnetic field solver, FEKO [1], and uses the Method-of-Moments (MoM) formulation. The technique is based on that initially presented in [2] and is a perturbation approach where mutual coupling between...
This paper considers the characteristic mode analysis (CMA) of arbitrary electromagnetic structures using the comprehensive 3D electromagnetic field solver, FEKO [1]. The theory of characteristic modes, as presented in [2], is used to derive the real orthogonal current modes. These modes are obtained by solving a generalised symmetric eigenvalue problem defined by the real and imaginary parts of the...
This paper introduces several extensions and accelerations to the Method of Moments (MoM) formulation in the computer code FEKO, which all aim in solving large problems faster or using less memory.
This paper introduces some of the latest extensions and improvements to the electromagnetic kernel of the field computation package FEKO as made available in Suite 6.0: The accelerated MoM with different enhancements and extensions like e.g. acceleration of the hybrid FEM-MoM with MLFMM, ACA compression of MoM matrices, GPU computing and a hybrid MPI/OpenMP parallelisation strategy for mixed distributed/...
In order to solve complex electromagnetic radiation or scattering problems, there is often not a single method of choice. Different components or parts of such a complex problem are best solved with different numerical techniques, which then also need to be coupled within a hybrid framework. This paper provides an overview of a number of such hybrid techniques as available in the field solver package...
This paper introduces some of the latest extensions and improvements to the field computation package FEKO: Support for aperture modeling in the planar multilayer Green's function using magnetic surface currents, the integration of SPICE subcircuits in combination with electromagnetic models, accurate shielding computations in the modeling of geometrically thin lossy layers and acceleration by GPUs...
Many new features have been included in the latest release of the electromagnetic simulation package FEKO suite 5.4 from July 2008. This paper aims at giving an overview of the major new features added to the computational kernel, which are: Modelling of periodic boundary conditions for 1-D and 2-D periodic structures, the inclusion of waveguide port excitations within the MoM/PO hybrid method, the...
The application of a parallelized multilevel fast multipole method (MLFMM) is described and illustrated through examples for the solution of large scale and complex EMC problems. Furthermore, to reduce the modeling complexity of such EMC problems, we propose a combination of field with network theory to split large problems into smaller sub-problems which can be analyzed individually and then again...
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