Reduction of EMI Due to Common-Mode Currents using a Surface-Mount EBG-Based Filter
Common-mode (CM) noise on differential signals can be suppressed by planar electromagnetic bandgap (EBG) technologies. In this study, two new CM filter structures were designed, fabricated, and measured. The filters are based on a previously proposed geometry, a "sandwich-type" EBG structure that resonates at the desired filter frequency; however, the new filters are placed on the top of the PCB as a surface-mount component, instead of being implemented within the PCB stackup. Stripline and microstrip versions of the surface-mount filter are considered. The filters can be easily removed and substituted with another one that is designed to filter a different frequency but maintains the same footprint and external dimensions. In addition, the surface-mount filter allows us to incorporate dc blocking capacitors into the microstrip version of the filter, thus providing two functions in one package. The total radiated power (TRP) of the implemented filter is investigated and discussed. RF absorbing material and traditional shielding are considered to reduce the TRP.
Q. Liu et al., "Reduction of EMI Due to Common-Mode Currents using a Surface-Mount EBG-Based Filter," IEEE Transactions on Electromagnetic Compatibility, vol. 58, no. 5, pp. 1440-1447, Institute of Electrical and Electronics Engineers (IEEE), Oct 2016.
The definitive version is available at http://dx.doi.org/10.1109/TEMC.2016.2580701
Electrical and Computer Engineering
Electromagnetic Compatibility (EMC) Laboratory
Keywords and Phrases
Common-mode (CM) filter; differential pair; electromagnetic bandgap structures (EBG); narrowband filter
International Standard Serial Number (ISSN)
Article - Journal
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