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Accession Number:
ADA106518
Title:
Image Theory EM Fields of Horizontal Dipole Antennas in Presence of Conducting Half-Space
Descriptive Note:
Technical rept.
Corporate Author:
NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CT
Report Date:
1981-09-18
Pagination or Media Count:
36.0
Abstract:
It is the purpose of this report to extend the use of quasi-static range finitely conducting earth-image theory techniques to the nearfield and farfield ranges. Simple engineering expressions for horizontal electric and magnetic dipole antennas have been derived for the air-to-air, subsurface-to- air, air-to-subsurface, and subsurface-to-subsurface propagation cases. These expressions have been compared with previously derived analytical or numerical integration results. For the air-to-air propagation case, the image-theory expressions are valid from the quasi-static to the farfield ranges, as long as the square of the index of refraction is large and the Sommerfeld numerical distance is small. For the subsurface-to-air, air-to-subsurface, and subsurface- to-subsurface propagation cases, the additional restriction that the measurement distance be greater than three times the burial depth of the source andor receiver must be met.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE