Electromagnetic scattering from microwave absorbers: Laboratory verification of the coupled wave theory

Abstract

Laboratory W-band measurements of the bistatic scattering function of some common microwave absorbing structures have been made. The structures investigated include periodic wedge-type and pyramid-type iron-epoxy calibration loads and flat carbon-foam 'Echosorb' samples. Measurements were made using an HP 8510 network analyzer interfaced with a focused-lens scattering range. The test set provided a dynamic range of approximately 55 dB. Swept frequency measurements over the 75-100-GHz band have revealed specular and Bragg reflection characteristics in the measured data.<>