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Comparison of the up-over-down approximation with the quasi-electrostatic approximation for ELF fields in layered media

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4 Author(s)
Rebich, R.T. ; Univ. of Idaho, Moscow, ID, USA ; Young, J.L. ; Wagner, C.L. ; Olsen, R.G.

Two approximate methods are presented that quantify low frequency field effects of a horizontal electric dipole in a layered environment. The first is a far-field approximation (relative to water) that is interpreted as the up-over-down effect. In this situation, wave processes are characterized using classical ray optics arguments and equations. The second method focuses on the quasi-static nature of the fields to arrive at an infinite image representation of the field. Both yield good results when compared to the exact solution, albeit the quasi-electrostatic solution does better at extremely low frequencies (e.g. 30 Hz) and the up-over-down solution does better at ultra-low frequencies (e.g. 1,000 Hz).

Published in:

Antennas and Propagation (APSURSI), 2011 IEEE International Symposium on

Date of Conference:

3-8 July 2011