Patent ID: 7439839

Claim:
An electrical coil of at least two turns, comprising: a first electrically-conductive element of a thin, flat, annular configuration formed with a gap to define a first turn of the coil; a second electrically-conductive element also of a thin, flat, annular configuration and also formed with a gap to define a second turn of the coil, said second electrically-conductive element being disposed coaxially with respect to said first electrically-conductive element; and electrical insulation between said first and second electrically-conductive elements insulating said first turn from said second turn except for one end of each turn to be electrically connected together; characterized in that said insulation includes an electrically-insulative element also of a thin, flat, annular configuration disposed coaxially between said first and second electrically-conductive elements and formed with a gap aligned with said one end of each turn to permit said ends to be electrically connected together.