Dragan Poljak

Stochastic Collocation Analysis Of The Transient Current Induced Along The Wire Buried In A Lossy Medium

The paper deals with the stochastic collocation analysis of a time domain response of a straight thin wire scatterer buried in a lossy half-space. The wire is excited by a plane wave transmitted through the air-ground interface. Transient current induced at the centre of the wire, governed by corresponding Pocklington integro-differential equation is determined. This configuration, as is the case with many electromagnetic compatibility (EMC) issues, suffers from uncertainties in various parameters, such as ground properties, wire dimensions, position, etc. The obtained results yield additional statistical information thus enabling more accurate and efficient analysis of buried wire configurations.

Electromagnetic field coupling to buried wires: Comparison of frequency domain wire antenna and transmission line model

The paper deals with different frequency domain approaches for the analysis of electromagnetic field coupling to finite length buried wires based on the wire antenna theory, and the transmission line method (TLM). The wire antenna formulation deals with the corresponding Pocklington integro-differential equation, while the transmission line model uses the Telegraphers equations. The Pocklington equation is solved via the Galerkin-Bubnov scheme of the indirect boundary element method (GB-IBEM), while the transmission line equations are treated using the chain matrix method. Some illustrative numerical results for the frequency response of the buried conductor of finite length, obtained via different approaches, are presented in this paper.

Galerkin-Bubnov Boundary Element Analysis of the Yagi-Uda Array

Currents induced along the elements of a wire antenna arrey are calculated by solving the set of electric field integral equations (EFIEs). These coupled integral equations are handled via the Galerkin-Bubnov Boundary Element Method (GB-BEM). Once obtaining the currents along the wires an electric field radiated ba wire structure and the corresponding input ompedance are evaluated.

The Matrix Pencil method applied to smart monitoring and radar

The paper deals with the Matrix Pencil method, an efficient numerical method to identify deterministic signals based on either simulation or measurement. The method is usually referred to as a high-resolution technique as it is capable of identifying non-stationary signals, even in the presence of numerical or measurement noise, respectively. The basis functions are complex exponentials with a damping factor. Those functions are rather appropriate to identify electromagnetic waves or distributed currents with an optimal number of elements. The method is applied either in time domain, in frequency domain or in space domain allowing one to identify the original signal by means of a limited number of singular values, poles and residues.

Boundary Element Modeling Of HorizontalGrounding Electrodes Using The Set OfGeneralized Telegrapher’s Equations

The analysis of a horizontal grounding electrode has been carried out using the set of generalized telegrapher’s equations. The integro-differential relationships arising from the full wave model are numerically handled via the Galerkin– Bubnov scheme of the Indirect Boundary Element Method (GB-IBEM). Some illustrative numerical results for the current and voltage induced along the horizontal electrode are given in the paper.