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Time domain analysis of thin‐wire antennas over lossy ground using the reflection‐coefficient approximation
Author(s) -
Fernández Pantoja M.,
Yarovoy A. G.,
Rubio Bretones A.,
González García S.
Publication year - 2009
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2009rs004152
Subject(s) - ground plane , reflection coefficient , lossy compression , reflection (computer programming) , method of moments (probability theory) , antenna (radio) , perfect conductor , fourier transform , conductor , mathematical analysis , mathematics , optics , acoustics , computer science , geometry , physics , telecommunications , statistics , estimator , scattering , programming language
This paper presents a procedure to extend the methods of moments in time domain for the transient analysis of thin‐wire antennas to include those cases where the antennas are located over a lossy half‐space. This extended technique is based on the reflection coefficient (RC) approach, which approximates the fields incident on the ground interface as plane waves and calculates the time domain RC using the inverse Fourier transform of Fresnel equations. The implementation presented in this paper uses general expressions for the RC which extend its range of applicability to lossy grounds, and is proven to be accurate and fast for antennas located not too near to the ground. The resulting general purpose procedure, able to treat arbitrarily oriented thin‐wire antennas, is appropriate for all kind of half‐spaces, including lossy cases, and it has turned out to be as computationally fast solving the problem of an arbitrary ground as dealing with a perfect electric conductor ground plane. Results show a numerical validation of the method for different half‐spaces, paying special attention to the influence of the antenna to ground distance in the accuracy of the results.