Differntial mode currnts and EM radiation

[myatham]

Hello,

I have read that common mode currents are primarily responsible for most of the radiation problems. Does it mean that differential mode current will cause any issue in radiation point of view?

In radiation susceptibility, will it cause differential current in the design or only common mode currents?

Please help me on this

 

[jiripolivka]

Everything depends on the wave propagation in a given line structure.
If you have a twisted-line cable, then the AC or RF power travels in it using the "differential" mode. If the line is well balanced ad far from any other conductors, it would not radiate. Once there appears a close conductor, common-mode currents are induced in it, and radiation can occur due to it. The only good solution is to surround the twisted-line with a conductive tbe, so nothing can radiate outside.