Drazen S. Sumic

Efficient iterative solution of surface integral equations based on maximally orthogonalized higher order basis functions

The goal of this paper is to propose maximally orthogonalized higher order basis functions that automatically satisfy the continuity equation at the boundary elements (BE) edges. As a result, orthogonality was imposed between all basis functions except between the two lowest order functions. Numerical results show that the proposed higher order basis functions enable convergence as fast as low order basis functions, which qualifies higher order basis functions for application with iterative solvers.

Efficient EM modeling based on conversion of triangular mesh into quadrilateral mesh

For efficient EM modeling of real life structures it is very often needed to import these structures from CAD formats. Final step in this procedure is meshing of imported structure. Techniques and algorithms for meshing into triangles are much more developed than those into quadrilaterals. The paper presents novel and efficient technique for conversion of triangular mesh into quadrilateral mesh. Results obtained by MoM/SIE applied to two types of meshes are compared for both, flat and curved surfaces.

Electromagnetic simulation of complex and electrically large structures in WIPL-D Pro [Application Notes]

This article has demonstrated the application of higher order basis functions, smart reduction of expansion orders, and multilevel fast multipole method in efficient 3-D EM simulation of complex and electrically large structures (from compact multiband antenna for wireless applications to 160 lambda long aircraft scatterer) at a desktop computer.

Efficient RCS calculation of fighter airplane on a PC using maximally orthogonalized higher order basis functions

Computation of RCS of electrically large bodies is memory and time-demanding. Various high frequency/asymptotic computational methods have been presented with the aim of reducing memory and time requirements, but with loss of accuracy.

Optimized quadrilateral mesh for higher order method of moment based on triangular mesh decimation

A challenge very often presented to an electromagnetic (EM) expert is to perform EM simulation in order to predict the behavior of an antenna placed in a real-life environment or an RCS of a vehicle/aircraft. In order to meet the challenge, an adequate 3D model needs to be created or an existing model adapted to make it suitable for EM simulation. A well-structured CAD model is then meshed into simple geometrical elements on which one of the EM simulation methods is applied.

Efficient solution of electrically large and complex problems using parallel WIPL-D 3D EM solver

In this paper, we present an overview of parallelization of WIPL-D 3D EM solver and present examples of electrically large structures simulated on a small computer cluster. A helicopter up to 51 lambda long was used as a benchmark example for illustrating parallelization efficiency. Radar cross section from the 51 lambda long helicopter is calculated in 72 minutes on a low-cost 8-node cluster.

Extended limits of WIPL-D on PCs

In the process of electromagnetic modeling and simulation, one encounters various limits imposed by the hardware capabilities of modern computers. As the complexity or the electrical size of the problem grows, so does the need for faster processors and more RAM in order to make the analysis of such projects feasible. With the era of 64 bit computing at our door step, 4 GB is no longer the theoretical maximum addressable memory space on PC computers, which allows the analysis of demanding electromagnetic problems on every desktop. In this paper, several tests have been presented regarding the analysis of a cube of dimensions up to 30lambda times 30lambda times 30lambda. Significant advancements in modeling and analysis of electrically large structures in WIPL-D Pro code are the main focus. Tests include: running WIPL-D Pro code in the Windows and Linux 64-bit environments, employing 2 processors in parallel and speed comparisons between the latest and previous versions of the code