Hi,
During the EMC qualifying process, it was observed that there are interference
by the PCB above the standard limit at vertical polarization in the frequency
range of 35MHz to 100MHz. Since It was due to power Modules in the PCB, I added
a ferrite bead at the input of the power module.When I measured the emission by
the power module using loop antenna at near field, there is no improvement
before and after adding ferrite bead. I felt that it is mainly due to Magnetic
field emitted by the inductor. What will be the best method to mitigate this
issue.
Thanks
Jack
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