A Substitution Method for antenna calibration by the use of broadband antenna (30 to 1000 MHz)

ANSI C63.5-2006 [1] provides two annexes, Annex G and Annex H, for the use of antenna factors for NSA measurements. Annex G applies Tables G2 and G3 for Biconical dipole antennas as derived from free space antenna factors using a simulation technology to the specified geometry of Geometry-specific Correction Factor (GSCF). Annex H describes the measurement procedure and reference site requirements in order to measure GSCF for a pair of antennas intended to be used in the normalized site attenuation (NSA) testing. Use of the Annex H assumes the user cannot apply the calculated GSCFs in Annex G. For example, calculated GSCFs have not yet been developed for hybrid broadband antennas and therefore the Annex H would be applied. This paper proposes an alternative calibration method to the Annex G and H, that is, a Broadband Antenna Substitution Method (SUB) in 10-m semi-anechoic chambers (SAC).