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Impedance measurements of Deception Island as a natural very‐low‐frequency antenna
Author(s) -
Morgan M. G.
Publication year - 1979
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/rs014i001p00019
Subject(s) - antenna (radio) , electrical impedance , range (aeronautics) , resonance (particle physics) , deception , transmission line , geology , acoustics , physics , telecommunications , materials science , computer science , atomic physics , psychology , social psychology , quantum mechanics , composite material
In 1960 I suggested that Deception Island, near the northern end of the Antarctic Peninsula, might serve as a useful naturally resonant VLF slot antenna. Connection across the island was subsequently made and impedance measurements were obtained. Contrary to theoretical predictions by Galejs and by Staras, a strong resonance was obtained. However, it occurred at 9.5 kHz, rather than at 5 kHz as anticipated. This is ascribed to a short, low cut through one of the arms of the island which otherwise range from 500 to 1000 ft high. A composite transmission line model is constructed to represent the data. A first approximation to the efficiency suggests that it is in the range of 10–25%.