Effect of apex angle on absorption characteristic of pyramidal absorbers

Array of absorbing pyramid cones are widely used in anechoic chambers to measure electromagnetic wave interference Accuracy of measurements is related with absorbing performance of pyramidal structures on chamber walls. Absorbing performance of pyramidal structure depends on various parameters such as dielectric permittivity, magnetic permeability, material used for pyramids, physical dimensions of absorber etc. To determine effect of apex angle on absorption characteristics, absorbers which have different apex angles with same material are investigated. Reflectivity values are calculated. Both normal and oblique incidences of plane wave are analyzed. Results for different incidences angles and frequency bands are presented.