ELECTROMAGNETIC WAVE ANEHOIC CHAMBER FOR EMC TEST AND SHIELDING MATERIAL THEREFOR

摘要

PURPOSE:To reduce the size of a testing chamber while realizing correct EMC test by constructing all the structural inner walls of the shielded chamber with electromagnetic absorber panels consisting of ferrite. CONSTITUTION:All the inner walls of an electromagnetic wave anechoic chamber 10, namely the side walls, ceiling and floor thereof are constituted of panels 13 of an electromagnetic wave absorber, namely ferrite. Electromagnetic waves from the outside are absorbed and reflected by a shielding member 12 having a double shielding structure consisting of a copper plate and an iron plate and will not affect a test to be conducted within the chamber in any way. In order to evaluate radiant electromagnetic noise within the electromagnetic wave anechoic chamber, electromagnetic waves radiated by a device to be tested 16 are received by an antenna 18 and measured by a measuring device 20. Among the electromagnetic waves radiated by the device to be tested 16 in this test, most of the waves toward the floor, ceiling and side walls of the anechoic chamber are absorbed by the electromagnetic absorber panels basically consisting of ferrite. Accordingly, the waves that the antenna 18 principally receive are linear waves.