A Study of Characteristics of a Semi-anechoic Chamber with an Equivalent Earth Ground Plane below 30MHz

Abstract

Measurement methods of radiated disturbance below 30MHz and characteristics of semi-anechoic chambers to be used for the measurement are currently being discussed at CISPR/SC-D. Hence, theoretical calculation and comparative reviews between values measured in semi-anechoic chamber and those measured on various types of road surface are implemented. The aim of the experiments is to incorporate the equivalent earth ground plane in semi anechoic chamber which approximates to Japanese car manufactures’ unique ground reflective characteristics into the CISPR standard.