Characterization of Nanocrystalline Cores for EMI Suppression in Cables

Abstract

Electromagnetic interferences (EMI) can cause different kinds of problems in digital and analog systems, leading to malfunctions, system reboots, or even permanent damage to the system if this is not adequately designed or protected. Nowadays, most electronic products are connected to the main power network or are designed to be interconnected with others through cables. These cable interconnections are becoming more difficult due to the rigid restrictions related to the accomplishment of electromagnetic compatibility (EMC) compliance. When the cables of a system represent an EMI source, it cannot pass the conducted or radiated emissions test. A widely used technique to reduce these problems is applying an EMI suppressor such as a sleeve core. This EMI suppressor provides selective attenuation of undesired interference components that the designer may wish to suppress, and it does not significantly affect the intended signal. This contribution focuses on analyzing different nanocrystalline (NC) EMI suppressors’ performance intended for attenuating interferences in cables. Some NC novel samples are characterized and compare to MnZn and NiZn cores to determine this novel material’s effectiveness compared to the conventional ceramic solutions by analyzing samples with different dimensions.

Design and Study of a Wide-Band Printed Circuit Board Near-Field Probe

“…The security of an electronic system where there are devices that produce electromagnetic disturbances and elements or small-signal circuits, sensitive to such disturbances, depends on the compatibility of the signal levels used. Hence, it is convenient to comply with specific design rules that make the disturbance levels generated by the interferences source elements compatible with the signal levels used by the possible victim elements or elements sensitive to such interferences [6][7][8][9].…”

“…Detection and correct characterization of the EMI is an important factor in designing a suitable solution. Thus, it is essential to perform EMI measurements using different instrumentation, measuring probes and antennas to detect the electromagnetic fields that can provide information to the designer from undesired signals [7].…”