In　some　special　work　scenarios,　unmanned　aerial　vehicles　(UAVs)　are　un　land　or　need　to　hover　for　a　long　time.　Inflight　wireless　power　transfer　(WPT)　technology　improves　convenience　and　extends　operating　hours.　However,　there　will　inevitably　be　some　offset　during　in-flight　WPT.　Realization　of　in-flight　WPT　for　UAVs　in　any　position　will　greatly　improve　the　availability.　At　the　same　time,　in　order　to　minimize　the　impact　on　the　work　of　the　UAVs　and　to　increase　the　applicability,　the　WPT　system　needs　to　be　specially　designed　in　order　to　meet　requirements　such　as　lightweight.　A　novel　WPT　system　for　the　above　requirements　is　proposed　in　this　paper.　A　rotating　time-varying　magnetic　field　is　generated　by　designed　coils　and　control　of　current　phase.　Wireless　power　can　be　received　when　the　UAV　is　hovering　at　any　azimuth　around　the　transmitter　coil.　The　system　operates　at　6.78　MHz　for　a　lighter　weight　and　a　longer　transfer　distance.　Class-EF　converters　which　designed　for　the　current　requirement　are　used.　A　50　W　experimental　prototype　is　developed　to　verify　the　proposed　WPT　system.　©　2025　IEEE.