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

Personal Author(s):

• Bannister, Peter R.

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.

Descriptors:

• *BURIED OBJECTS
• *DIPOLE ANTENNAS
• *ELECTROMAGNETIC FIELDS
• NUMERICAL ANALYSIS
• DEPTH
• IMAGES
• HORIZONTAL ORIENTATION
• RANGE(DISTANCE)
• STATICS
• AIR TO AIR
• THEORY
• MEASUREMENT
• PROPAGATION
• NUMERICAL INTEGRATION

Subject Categories:

• Electrical and Electronic Equipment
• Radiofrequency Wave Propagation
• Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE