Abstract
In this paper, a novel method based on the Poggio–Miller–Chang-Harrington–Wu–Tsai (PMCHWT) integral equation is presented to study the electromagnetic fields excited by vertical or horizontal electric dipoles in the presence of a layered region which consists of K-layered dissipative media and the air above. To transform the continuous integral equation into a block tridiagonal matrix with the feature of convenient solution, the Rao–Wilton–Glisson (RWG) functions are introduced as expansion and testing functions. The electromagnetic fields excited by an electric dipole are calculated and compared with the available results, where the electric dipole antenna is buried in the non-planar air–sea–seabed, air–rock–earth–mine, and multilayered sphere structures. The analysis and computations demonstrate that the method exhibits high accuracy and solving performance in the near field propagation region.
Highlights
The electromagnetic fields excited by a dipole source in a layered dissipative medium structure have been investigated widely because of their applications in Through-the-Earth communication, underwater communication, ground penetrating radar technology, and antenna design [1,2,3,4,5,6]
The developments in electromagnetic field propagation in layered medium structures have been analyzed by many investigators, including Wait [7,8,9] and King [7,10,11] who proposed the asymptotic methods, and the surface-impedance technique has been used for a two-layered region
King et al have obtained the complete formulas for electromagnetic fields excited by horizontal and vertical electric dipoles in two- and three-layered regions by using the proposed method in the recent studies
Summary
The electromagnetic fields excited by a dipole source in a layered dissipative medium structure have been investigated widely because of their applications in Through-the-Earth communication, underwater communication, ground penetrating radar technology, and antenna design [1,2,3,4,5,6]. The numerical results have been verified via a unified method of moments (MoM) model based on the electric field integral equation (EFIE) given by Khamas [14] These algorithms are suitable for analyzing the non-planar electromagnetic problem only when the structure is a concentric sphere, which limits their application in an arbitrary shaped non-planar layered region. In most studies [16,17,18,19], surface integral equation (SIE)-based methods have been adopted in the numerical analysis of the scattering of arbitrary shaped objects and the scattering of objects buried in layered structure, but few of them focus on the electromagnetic fields excited by dipoles in arbitrary layered dissipative media. An SIE-based method to study the electromagnetic fields excited by electric dipole submerged in arbitrary layered homogeneous dissipative media is proposed. The numerical results are presented to discuss the difference of the proposed method in comparison with the Computer Simulation Technology (CST) Studio Suite
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