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Input admittance of a horizontal antenna over a two‐layered lossy half‐space
Author(s) -
Ridd P. V.,
Nicol J. L.
Publication year - 1990
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/rs025i001p00027
Subject(s) - admittance , antenna (radio) , sensitivity (control systems) , dipole antenna , overburden , dipole , resonance (particle physics) , optics , wavelength , acoustics , physics , lossy compression , geology , electrical impedance , mathematics , telecommunications , electronic engineering , computer science , engineering , mining engineering , particle physics , quantum mechanics , statistics
Calculations of the input admittance of a thin cylindrical horizontal dipole antenna over a two‐layered lossy half‐space have been carried out. This has allowed an evaluation to be made of the sensitivity of admittance measurements to variations in the electrical characteristics of the Earth below a conducting overburden and hence to determine the potential of such measurements in geophysical surveying. The results show that maximum sensitivity to changes in the complex permittivity of the lower half‐space is obtained by the use of a band of frequencies about the first antenna resonance. The maximum depth of sensitivity of the observations was found to be approximately one quarter of the resonance wavelength or 8 m for an antenna of length 15 m, indicating that admittance measurements provide a potentially useful and simple geological surveying technique.