Date of Award

3-2006

Document Type

Thesis

Degree Name

Master of Science

Department

Department of Electrical and Computer Engineering

First Advisor

Michael J. Havrilla, PhD

Abstract

In September 2005, radar cross section (RCS) measurements were made of resistive sheets, or R-cards, wrapped around a polystyrene foam cylinder to compare with a newly developed theoretical RCS prediction technique. The resistivities of the R-cards were initially measured with a direct current (DC) four-point probe. When the RCS measurements were compared to the theoretical predictions, it became clear that DC resistivity alone is not sufficient to accurately predict the scattering from an R-card. This thesis presents alternating current (AC) methods for determining the resistivity of an R-card. Both freespace and waveguide techniques are presented. Experimental verification of the techniques is performed using two R-cards with DC resistivities 892 Ω/sq and 64 Ω/sq. The techniques are compared intraand inter-measurement apparatus. An error analysis is also performed to demonstrate the sensitivity of the techniques to errors in the measurements of the thickness or the permittivity of the support backing.

AFIT Designator

AFIT-GE-ENG-06-24

DTIC Accession Number

ADA449506

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