Artur Noga

Adapting MoM With RWG Basis Functions to GPU Technology Using CUDA

In this letter, a CUDA-enabled graphics processing unit (GPU)-accelerated implementation of the method of moments (MoM) for solving three-dimensional conducting body-wire problems is presented. The solution is based on the mixed potential integral equation (MPIE) discretized using Rao-Wilton-Glisson (RWG) basis functions. The CUDA environment is employed to port a single-CPU sequential code to the parallel GPU platform, and some relevant issues are discussed. Numerical results are given for a helical antenna with a cylindrical cup reflector. The measured speedup of about eight times over the CPU implementation is demonstrated.

Physical optics approximation for PEC objects coated with lossy material

The Physical Optics (PO) approximation is investigated as tool for analysis of scattering problems involving coated electrically large conducting platforms. The PO-derived current is corrected by including additional terms that account for diffraction phenomena. Numerical example demonstrates usefulness and limitations of the approach and compares results for conducting and coated plate.

Using GPU accelerated version of MoM for solving scattering and radiation electromagnetic problems

In this paper, a CUDA-enabled GPU accelerated implementation of Method of Moments (MoM) for solving scattering and radiation electromagnetic problems is presented. The solution is based on the frequency-domain Electric Field Integral Equation (EFIE) formulation for arbitrary configuration of conducting bodies and wires. The CUDA environment is employed to port a single-CPU sequential code to the parallel GPU platform. Numerical results and measured speedups over CPU implementation are given for a testing structure.

Wide-Band Hybrid MM-PO Computational Electromagnetics Technique Using [Z] Matrix Interpolation and Adaptive Frequency Sampling

In this paper, we present a highly efficient computational electromagnetics technique for wide-band analysis of antennas radiating in the presence of electrically large conducting bodies (platforms). The technique is based upon the well known moment method-physical optics (MM-PO) hybrid formulation combined with the impedance matrix interpolation and a dynamic adaptive frequency sampling of the desired observable. Numerical examples are given to demonstrate considerable saving in both computer memory and CPU time offered by the proposed approach.

Application of the Improved PO Technique for Analysis of Scattering Problems

The major drawback of the physical optics (PO) approximation to the solution of scattering problems is that the edge effects can not be taken into account. Therefore, the PO-derived current should be usually corrected by including additional terms that account for diffraction phenomena. In this paper, the effect of the correction terms associated with diffraction on edges of a flat polygonal scatterer, and corresponding to the wedge diffraction is examined. Selected numerical examples demonstrate usefulness and limitations of the approach for analysis of the scattering problems.

Influence of Layer Stackup and Decoupling Capacitors Placement on Power Delivery Network Impedance

This paper discuses frequency properties of power delivery network impedance in multi-layer printed circuit boards. The influence of layer stackup and decoupling capacitors placement are illustrated as result of full-wave analysis performed by means of HyperLynx Power Integrity simulation software. Streszczenie. W artykule analizowano impedancję obwodów zasilania w wielowarstwowych obwodach drukowanych. Omówiono wpływ położenia płaszczyzn odniesienia oraz rozmieszczenia kondensatorów odsprzęgających na przebiegi częstotliwościowe impedancji widzianej na zaciskach układu cyfrowego. Wszystkie symulacje wykonano za pomocą programu HyperLynx PI.(Analiza wpływu rozmieszczenia płaszczyzn odniesienia i kondensatorów odsprzęgających na impedancję obwodów zasilania wielowarstwowych obwodów drukowanych).

Evaluation of the Magnetic Field Inside Grid-Like Large Volume

In this paper, a computationally efficient broadband electromagnetic simulation of lightning protection system is presented. The approach employs a hardware accelerated implementation of the method of moments combined with the Stoer-Bulirsch algorithm and adaptive frequency sampling scheme to explore the frequency response of a large volume grid-like structures directly hit by lightning. Emphasis is placed on the evaluation of the lightning-induced magnetic field intensity and its derivative within the volume protected by singleand double-layer shields. Streszczenie. W referacie opisano efektywną obliczeniowo, opartą na metodzie momentów, technikę szerokopasmowej analizy dużych, ekranujących struktur siatkowych umożliwiających ochronę przed wyładowaniami atmosferycznymi. Skuteczność metody pokazano przy wyznaczaniu natężenia pól magnetycznych indukowanych w trakcie bezpośrednich wyładowań atmosferycznych w obszarach chronionych przez jednoi dwuwarstwowe ekrany. (Wyznaczanie pola magnetycznego indukowanego w trakcie wyładowań atmosferycznych w obszarach chronionych przez duże ekrany siatkowe).

Accelerating frequency-domain simulations using small shared-memory CPU/GPU cluster

Numerical approach to frequency response problems usually requires that the system governing equation is solved repeatedly at many frequencies. The computational efficiency of the overall process can be increased by departing from traditional sequential computing model in favor of utilizing the parallel processing capability commonly offered by modern hardware. In this paper, we consider a hybrid programming pattern, OpenMP + CUDA, from the perspective of a user of a rather typical low-cost multi-core CPU-based workstation that can accommodate up to four GPUs. Such the small-scale heterogeneous platforms have recently gained wide popularity in scientific computing as an inexpensive massively parallel architecture. The relevant programming model issues and performance questions are addressed. Experimental results for the example physics problem, that is, the electromagnetic scattering from perfectly electrically conducting body, show that significant performance improvement can be attained with the OpenMP + CUDA programming model.

Design of dual-polarized MIMO linear antenna arrays with increased port-to-port isolation

In the paper selected issues of feeding networks for dual-polarized linear antenna arrays designed for 2×2 MIMO applications are described. The influence of topology of corporate feeding network on achieved port-to-port isolation is shown as the result of computer simulations. As an example, four element linear arrays of two-layer electromagnetically coupled microstrip antennas designed for U-NII 5.15-5.85 GHz frequency band are examined in CST Microwave Studio.

Kernel execution strategies for GPU-accelerated version of method of moments

In this paper, a CUDA-based parallelization technique for improving performance of the Method of Moments (MoM) for solving three dimensional conducting body-wire problems is presented. The efficiency of the presented approach depends significantly on the kernel execution strategies and configuration of a GPU hardware resources specified in kernel launch. To improve the performance of the CUDA-based body-wire MoM calculations, the computation was split into several separate kernels and overlapped with the data transfer between the host and the device memories. The proposed technique is applied to analyze the radiation of the monopole antenna mounted on a PEC body and backed up with comparison with single-CPU results. A noticeable speedup (up to 10x) of the overall MoM simulation is achieved due to employing CUDA-enabled GPU.