Thin foil pulse transformer coil for reducing distributed and leakage inductance

Claim 1

A transformer coil for a high-frequency pulse transformer comprising; a bobbin having four sides and a hollow center for placement about a core; a thin sheet of foil attached along its width to said bobbin and wound lengthwise about the bobbin in a coil; a first metal strip lead-in conductor having a width substantially covering one side of said bobbin and attached to said foil along the entire width of said foil on the inner end of said coil adjacent to said bobbin, said first metal strip extending lengthwise in a single direction beyond said coil adjacent to one side of said bobbin; a sheet of insulating material disposed between turns of said coil and extending beyond the edges thereof so as to provide insulation between turns; a second lead-in conductor attached to said foil along the entire width of said foil on the outer end of said coil and extending lengthwise beyond said coil in a single axial direction so as to form a region where said first lead-in and said second lead-in extend beyond the coil and are parallel and extending in width across a substantial portion of one side of the bobbin; and a layer of dielectric material sandwiched in said region between said first lead-in connector and said second lead-in connector so as to form a stripline connector to said coil and extending axially from one end thereof to facilitate assembly of said coil in a pulse transformer.