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size doe not matter( in a reasonable way;-) ) according my research a frequency around 80-100khz should be used to achiev a good performance. in this phase of the project the surface can have every shape needed.

@VE1BBL: size does not matter. but the leakage into the RF spectrum worries me.this might be a problem. i did not find any papers concerning this issue?

thank you! i even find the application notes you mentioned! http://www.epcos.de/web/generator/Web/Sections/ProductCatalog/Ferrites/FerritesAndAccessories/PMPPCoresHalves/PDF/PDF__ApplicationNotes,property=Data__nn.pdf;/Application_notes.pdf i think this will bring me a step futher!

EPCOS emerged from Siemens Matsushita Components, a joint venture founded in 1989 by Siemens and Matsushita. Since EPCOS went public on October 15, 1999, both former parent companies have remained important shareholders, each holding 12.5% of equity. EPCOS was floated on the Frankfurt and New...

distance less 1cm does not move, but has to be removable. it should transfer power from a basestaion to a portable terminal.

hello could somebody tell if there is a company wich sells systems for contactles power transfer? i need to transfer about 80W-100W at 24V. input does not matter. thank you.