relationhsip of coupling factor to distance

hi guys!

anyone out there knows what is the relationship between coupling factor and the distance, say in a coreless transformer? i am trying to simulate wireless transmission using OrCAD PSpice 15.7. =)

thanks!

- al

You can use FEM software to extract Spice parameters from geometry, e. g. FastHenry http://www.fastfieldsolvers.com. Or calculate an analytical solution for simple geometries from elementary field formulas.

thanks man!

i was studying fast henry a while ago. got a FastHenry 3.0wr version. but as i was reading the user guide, it didn't say how to model spiral (round) inductors. it did tell me how to do it with rectangular inductors. am i supposed to make like 20 segments? any one got experience using fasthenry? or other tools at par with fasthenry?

- al