A Methodology for Determining the Level and Nature of Scattering from Measurements of Material Samples in RF Propagation Modeling: System Calibration at 3.5GHz

For accurate RF propagation modeling, material
parameters must be realistically determined for tools like
Ray Tracing. This paper presents a reliable method for
measuring RF scattering by sample materials and outlines
the process for deriving usable modeling parameters.
Traditional reliance on conductive and dielectric properties
alone can lead to accuracy issues at higher frequency. The
method is, however scalable across frequencies, with a
focus on 3.5 GHz. It accommodates small-dimension
samples, with calibration being a critical component. The
paper emphasizes calibration using a flat metal plate (34cm
x 17cm) and highlights key outcomes used to discern the
scattering behavior of various materials based on gain,
beamwidth, and sidelobe levels. The results closely match
theoretical expectations for a uniformly illuminated metal
sheet, with a beamwidth ranging approximately 40°- 50°,
sidelobe levels below 11 dB than the main beam, and a
cross-polarization ratio (XPR) around 18-20 dB. This data
enhances RF propagation modeling.