Rationalizing technical issues about globally standardizing free-space type EMC site - proposal to deleting traditional concepts of AF and NSA in the CENELEC's draft for 30MHz through 18GHz bands

摘要

Although rationalizing the EMI test methods for 30MHz through 18GHz bands using the free-space test site are expected to proceed greatly by an official acceptance of the fully anechoic chamber by the CENELEC (European Committee for Electro-technical Standards organized by 18 nations), there still remains inappropriate traditional concepts such as AF (Antenna factor) and NSA (Normalized Site Attenuation). This paper explains how the traditional concepts be unsuitable and then proposes the introduction of the free-space deviation derived from the antenna gain and the free space propagation loss to evaluate the site suitable for ones of the free-space type.