Accession Number:

ADA243164

Title:

Groundscreen Characterization

Descriptive Note:

Corporate Author:

MITRE CORP BEDFORD MA

Personal Author(s):

• Parker, L. W.

Report Date:

1991-10-01

Pagination or Media Count:

25.0

Abstract:

The screen parameter for a Fresnel reflection coefficient model is calculated for a plane wave obliquely incident on a parallel-wire grid of infinite extent, in proximity to and parallel to flat lossy earth. J. R. Wait has published mathematical models for this problem. The numerical results from a computer code implementing Waits expansion models allow an assessment of the range of validity for a simplified screen parameter formula. The screen parameter developed in this paper is not applicable to grids of electrically- small extentsmall compared to a wavelength or to grids consisting of disconnected electrically-small panels of gids because diffraction and reflection at the edge of the grids causes the current distribution on the grids to differ appreciably from that on a grid of infinite extent. Author

Descriptors:

• *COMPUTER PROGRAMS
• DISTRIBUTION
• GRIDS
• PLANE WAVES
• LOSSES
• EXPANSION
• EARTH(PLANET)
• MODELS
• NUMERICAL ANALYSIS

Subject Categories:

• Countermeasures
• Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE