Calibration of fully anechoic rooms and correlation with OATS measurements

Fully anechoic rooms may gradually replace open area test sites as the preferred type of testing facility for the measurement of radiated emissions. The fully anechoic room offers several advantages over the open area test site. Immunity to high ambient signal levels, the capability of being located in metropolitan areas close to the customer base, more uniform field over a larger area a reduction in test time since there is no need to scan the receiving antenna in height, and the capability of being used for both emissions and susceptibility testing. Measurements of site attenuation in a fully anechoic room show excellent correlation with the mathematical model for normalized site attenuation in free space. The mathematical model and the measurement results are presented.