Professor Dragan Poljak from the Department of Electronics, University of Split, Croatia presented a special half-day seminar at WIT entitled; Frequency Domain Analysis of Wire Antennas. The aim of the seminar was to introduce participants to the analysis of thin wires in a way in which they could solve complex problems by using sophisticated numerical modeling tools.
Dragan firstly explained the single wire model in the frequency domain and then derived the set of coupling Pocklington integro-differential equations.
This set of integro-differential equations has been numerically solved via the Galerkin-Bubnov scheme of the indirect Boundary element method and the currents along all wires of the array have been obtained. Knowing the currents induced along the particular wire configuration provides the assessment of other important antenna parameters such as radiated field, radiation pattern, or input impedance.
During the Course Dragan covered the following topics, in detail:
- Fundamentals of electromagnetic radiation
- Modeling of thin wire integral equations in the frequency and time domain
- Frequency domain analysis: Thin wire arrays in free space
- Frequency domain analysis: Thin wire arrays above a lossy half-space
Both antenna and scattering mode have been analyzed throughout the course and a number of illustrative computational examples, pertaining not only to academic, but also to some real world problems regarding analysis of thin wire arrays (in free space and in a presence of a half-space, respectively) have been presented.
All the results Dragan presented were obtained by using the TWiNS (Thin Wire Numerical Solver) code accompanied by the book: CAD Design of Wire structures: Frequency and Time Domain Analysis, by Poljak et al. published by WIT Press in January 2007.
This course ended up with a lively and long discussion related to possible wire antenna applications, (including short-pulse radar, lightning protection devices, wide-band radio communication, grounding systems, etc.) and some particular features of the TWiNS code.
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