Accession Number : ADA308236

Title :   Anechoic Chamber Simulation and Verification.

Descriptive Note : Master's thesis,

Corporate Author : CALIFORNIA STATE UNIV NORTHRIDGE

Personal Author(s) : Taylor, Robert M.

PDF Url : ADA308236

Report Date : JUN 1993

Pagination or Media Count : 62

Abstract : This project considers an electromagnetic field simulation of an anechoic chamber with verification measurements. The simulation is a Geometric Optics (Ray Tracing) mathematical model of the direct path between two antennae and interfering scattering. There are two separate models due to the frequency dependent nature of the pyramidal absorbing material. The measurements and simulations were based on an azimuth cylindrical scan. The model for the frequency range of 30 to 500 MHz was used to characterized lossy specular scattering as a lossy, tapered, TEM transmission line in an inhomogeneous, anisotropic, tensor material. The frequency range of 500 MHz to 18 GHz was characterized by dominant tip diffraction of RAM patches, and the model made use of a Uniform Theory of Diffraction code for a dielectric corner.

Descriptors :   *ANECHOIC CHAMBERS, *RADAR ABSORBING MATERIALS, MATHEMATICAL MODELS, VERIFICATION, DIELECTRICS, DIFFRACTION, CYLINDRICAL BODIES, GEOMETRY, LOSSES, TENSORS, RADAR ANTENNAS, AZIMUTH, RAY TRACING, ELECTRICAL MEASUREMENT, SPECULAR REFLECTION, CONICAL SCANNING, PYRAMIDS(GEOMETRY).

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE