Author(s)

D. Poljak & S. Kresic

Abstract

Transient behaviour of plane waves in the presence of a two media configuration is analysed in this work. The time domain formulation of the problem is based on simplified reflection and transmission coefficient expressions arising from the modified image theory. Knowing the impulse response of the finitely conducting half-space the reflected and transmitted fields respectively, can be obtained by using a convolution operator. Some illustrative numerical results for transient earth-reflected waves are presented. Keywords: Transient analysis, plane waves, reflection and transmission coefficients, modified image theory, imperfectly conducting half-space. 1 Introduction In many electromagnetic compatibility (EMC) applications it is important to determine the transient behaviour of plane waves reflected from imperfectly conducting earth [1] or transient waveform fields penetrating into a lossy medium [2]. The analysis of electromagnetic waves behaviour in the presence of lossy media can be modelled via the rigorous Sommerfeld integral approach [3], [4] or via the approximate reflection and transmission coefficient approach [5], [6] and can be carried out in the frequency or in the time domain, respectively. One of the most cited papers dealing with a frequency domain analysis of transient waves reflected from a lossy half-space is the work performed by Dudley et al. [7]. Yet direct time domain modelling is a more demanding task in both analytical and numerical sense, it certainly provides a deeper insight into the particular

Keywords

Transient analysis, plane waves, reflection and transmission coefficients, modified image theory, imperfectly conducting half-space