Summary
International Symposium on Electromagnetic Compatibility
2009
Session Number:21Q2
Session:
Number:21Q2-5
Study on Invasiveness and Suppression Effect for Near Electromagnetic Field above PCB by Suppression Material
T. Kasuga,
pp.105-108
Publication Date:2009/7/20
Online ISSN:2188-5079
Summary:
This study is to make clear the suppression effect and influence of the near electromagnetic field by the conductive or magnetic plates put on the PCB. The suppression effect and influence by the copper, ferrite and composite material pasted the copper and ferrite plates together are discussed by the measurement and calculation. The suppression effect by the copper plate increases as the frequency shifts higher. The suppression effect by the ferrite plate is corresponded to the frequency characteristics of permeability of the ferrite. The suppression effect by the composite suppression material is large than that of the copper or ferrite plates by itself at all frequency band. As the influence for the near electromagnetic field by the FDTD is calculated, it is appeared that the invasiveness for the near magnetic field is large. As the composite material mc puts on the PCB, the influence with respected to the electric field between PCB and composite material is small. The invasiveness by the copper plate can be suppressed.