Modelling of pyramidal microwave absorber with a lossy slab in 400–1600 MHz frequency range

In this paper the reflectivity of a pyramidal absorber as a building part of an anechoic chamber was studied. A full-wave simulation software was used to compute the reflectivity of an EHP pyramidal absorber in different frequencies. Then a normalized reflectivity versus incident angle has been introduced. Finally a simple lossy slab with an effective fix permittivity and permeability has been introduced to model the reflectivity of the pyramidal absorber. This model can be used in simulation of the huge number of absorber in anechoic chamber instead of the pyramidal absorber.