Accession Number:

ADA443787

Title:

Material Surface Design to Counter Electromagnetic Interrogation of Targets

Descriptive Note:

Corporate Author:

NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION

Report Date:

2004-12-08

Pagination or Media Count:

32.0

Abstract:

Utilization of controllable ferroelectric and ferromagnetic layers coating a conducting object to provide an attenuation capability against electromagnetic interrogation is discussed. The problem is formulated as a differential game andor a robust optimization. The scattered field due to interrogation can be attenuated with the assumption of an uncertainty in the interrogation wave numbers. The controllable layer composed of ferromagnetic and ferroelectric materials 9, 10 is incorporated in a mathematical formulation based on the time-harmonic Maxwell equation. Fresnels law for the reflectance index is extended to the electromagnetic propagation in anisotropic composite layers of ferromagnetic and electronic devices and used to demonstrate feasibility of control of reflections. Our methodology is also tested for a non-planar geometry of the conducting object an NACA airfoil in which we report our findings in the form of reduced radar cross sections RCS.

Subject Categories:

  • Active and Passive Radar Detection and Equipment
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE