The application of wire mesh ground plane in Open Area Test Site for radiated emission measurement

摘要

Nowadays, the manufacturers apply the radiated emission test for all of their electrical or electronic products in order to avoid disturbance to other electrical or electronic products and to fulfil national or international standards. An Open Area Test Site (OATS) is one of the facilities used in the radiated emission measurement which requires the equipment under test (EUT), a receiving antenna with the antenna mast, the ground plane, and the radiated emission measurement device. The focus of this research is mainly about the ground plane of the OATS which can reflect the emission from the EUT to the receiving antenna. The perfect ground plane is very expensive; therefore the wire mesh ground plane can be used to cut the cost. The investigation of the ground plane could lead to an applicable radiated emission test and the accuracy of the measurement by using the mesh ground plane in OATS. In solving the problems related to the ground plane, the measurement of Normalized Site Attenuation (NSA) will be compared with the theoretical NSA. NSA is measured by transmitting signal from the frequency of 30 Mega Hertz (MHz) until 1000 MHz, assuming only two waves propagation which are direct wave and reflected wave.