Anechoic chamber performance can be significantly improved if microwave absorbers with optimized characteristics will be installed over the entire inner surface of shielded room. The selection criteria for absorbers may include the attenuation levels for normal and oblique incident angles, operating frequency, bandwidth, type of bulk materials, size, shape, weight and etc. Analysis of Pyramidal absorber attenuation properties are performed using fullwave MoM three-dimensional model.

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