A measurement system for EMC analysis of far field disturbance in the range 2–8 GHz

摘要

The measurement of far field disturbance radiated by printed circuit boards (PCBs) is here dealt with. In particular an efficient measurement system is proposed by means of which electronic designers can assess the effectiveness of a given electromagnetic compatibility (EMC) solution to be applied to a PCB in order to reduce the radiated disturbance in the 2–8 GHz band. The effectiveness of the system in terms of measurement repeatability is assessed, and one meaningful case study described. The values of measurement repeatability obtained, even in the order of 0.2 dB, show that the system can profitably be used for experimental procedures aimed at verifying the effectiveness of EMC solutions. The system is also suitable for experimental comparisons in terms of electromagnetic emissions of communication devices operating in the 2.45 GHz industrial, scientific and medical (ISM) band, such as those of ZigBee, Wi-Fi and Bluetooth standards.