Branko M. Kolundzija

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In this work numerical simulation and measurements of three-dimensional radiation patterns of a mobile handset model in the presence of a human head phantom were performed at 1800 MHz. Based on theoretical and experimental results, the influence of the human head on the radiation efficiency of the handset has been investigated as a function of the handset(More)
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(More)
1. Introduction Many problems in radar scattering, antenna and microwave fields can be solved by applying the Method of Moments (MOM) to the Surface Integral Equations (SIEs). In the general case very efficient modeling is achieved using quadrilateral patches and higher order basis functions [l]. However, such modeling can show poor accuracy if proximity(More)
—This letter discusses the connection of a dynamic electromagnetic variable, the radar cross section, and a static parameter , the polarizability. It is shown that with full-wave electromagnetic computation of the scattering of a sphere, its static response can be enumerated with good accuracy with remarkably few un-knowns. The result suggests that the code(More)
There are several sensitive spots in the WIPL analysis of the interdigital microwave filters. If it is not treated properly, the end effect causes significant errors in determination of their central frequencies. Coarse segmentation leads to underestimated coupling among transmission lines. Proper and careful modeling in WIPL can improve the overall(More)
This paper presents a novel formula for the complex permittivity of lossy dielectrics, which is valid in a broad frequency range and is ensuring a causal impulse response in the time domain. The application of this formula is demonstrated through the analysis of wet soil, where the coefficients of the formula are tuned to match the measured data from the(More)
The log-periodic dipole array (LPDA) has become the most popular commercial antenna for reception of TV signal in VHF and UHF bands in Europe. The antenna consists of two booms of a square cross section to which dipoles are attached (Figure 1). The booms play the role of the feeding two-conductor line. The dimensions of the boom are relatively large(More)
Efficient algorithms are proposed for power balance calculations in the case of lossy composite metallic and dielectric structures, when they are analyzed by using method of moments (MoM) applied to surface integral equations (SIEs). In particular, the algorithms are applied in the case when Galerkin variant of MoM is used to solve electric field integral(More)
Electric size of scatterers that can be analyzed by Method of Moment (MoM) is limited by memory and time resources. This limit can be significantly extended by using physical optics (PO) driven MoM. In this paper PO driven MoM is accelerated using Graphics Processor Units (GPUs). Thus, solution of scatterers requiring 1 million unknowns is enabled in one(More)
– Recently we introduced a new iterative method for analysing large perfectly conducting scatterers, called Physical Optics Driven Method of Moments (PDM). PDM performs grouping of original basis functions and creates macro basis functions using these groups. In this paper we present PDM results using variable number of groups per iteration.