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In this paper a new numerical method for determining the current distribution and input impedance of thinwire radial antennas in the presence of a perfectly conducting sphere is given. Two particular cases, a radial dipole antenna and a monopole antenna above the sphere are analysed. The method is based on Green's function for the Hertz dipole above the sphere and on the integral equations of Hallén type. The integral equations are numerically solved by the point-matching method combined with the polynomial approximation of the current distribution on the antenna conductors. The obtained results are compared with the corresponding results of other authors.
Übersicht
In diesem Artikel wird eine neue numerische Methode für die Bestimmung der Stromverteilung und des Eingangsscheinwiderstandes von einer dünnen, radianlen Drahtantenne in Anwesenheit einer vollkommen leitenden Kugel angegeben. Darin werden zwei verschiedene Antennen behandelt: die radikale Dipol-Antenne und die Monopolantenne, die im Fußpunkt gegen der Kugel erregt ist. Die aufgestellten (Halléns Art) Integralgleichungen werden numerisch mit der Stützstellenmethode gelöst. Die Stromverteilungsfunktion längs der Antenne wird durch ein Polynom approximiert. Die numerischen Ergebnisse stimmen mit den Resultaten der anderen Autoren überein.
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References
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Milovanović, B.D. Thin-wire antenna in the presence of a perfectly conducting sphere. Archiv f. Elektrotechnik 62, 317–319 (1980). https://doi.org/10.1007/BF01579000
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DOI: https://doi.org/10.1007/BF01579000