I am trying to study the radiated and conducted EMI fields of my PCB using ANSYS SIwave. I did the DC IR drop analysis, and that was okay. Next I did the "Compute Near-field" and "Compute far-field" for the same board configuration. Here is the result I got for far-field (frequency range = 150 kHz to 30 MHz)

Far Field Plot

Could somebody please help me interpret the results?

  • \$\begingroup\$ You need to find out what the Y axis represents. \$\endgroup\$
    – Andy aka
    Oct 4, 2020 at 11:08
  • \$\begingroup\$ @Andyaka The Y axis is selected under Max far field parameters.So, if I change my frequency range to 30MHz - 1GHz range and find this plot, it will give me the maximum radiated electric fields? Why is it in decibels? \$\endgroup\$
    – SM32
    Oct 4, 2020 at 11:17
  • \$\begingroup\$ I don't know. That's why I asked you to reveal what the axis was. I suspect it might be in dB relative to 1 microvolt/metre but i don't use that software. \$\endgroup\$
    – Andy aka
    Oct 4, 2020 at 11:19
  • \$\begingroup\$ @Andyaka yes it is indeed a measurement relative to 1uV/m. Which software do you suggest I use? Also, what does the y-axis quantity mean usually in other softwares? I checked this graph against limits of Class A & B and it seems to be satisfying both. \$\endgroup\$
    – SM32
    Oct 10, 2020 at 4:51
  • \$\begingroup\$ I don't have any suggestions to make and I can't advise what y axis other software uses. \$\endgroup\$
    – Andy aka
    Oct 10, 2020 at 7:26


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