Conducted　electromagnetic　interference　has　been　analyzed　in　many　papers,　and　few　papers　deal　with　the　problem　of　radiation　electromagnetic　interference.　However,　as　the　switching　frequency　increases,　wide　bandgap　devices　became　popular,　the　radiation　generated　by　the　power　converter　electromagnetic　interference　becomes　more　and　more　serious,　the　product　it　is　difficult　to　through　the　standard　radiation　electromagnetic　interference,　so　it　is　necessary　to　establish　general　radiation　EMI　model,　and　measure　the　relevant　noise　and　its　analysis,　and　more　intuitive　to　solve　the　problem　of　radiation　EMI.　Therefore,　this　paper　develops　a　radiation　model　based　on　the　flyback　converter,　and　then　studies　the　relationship　between　the　radiated　noise　current　and　the　radiated　electric　field　on　the　basis　of　this　model,　and　designs　a　current　transformer　to　measure　the　noise　and　evaluate　the　radiation　EMI　characteristics　of　the　converter.　Finally,　the　theory　and　technology　proposed　in　this　paper　are　verified　through　experiments.　©　2021　IEEE.