Abstract A noncontacting card containing a coil circuit has at least two spiral windings connected in parallel for electromagnetically coupling the card to a terminal and a processing circuit connected to the coil circuit for signal processing. A terminal for a noncontacting card including a coil circuit has at least two spiral windings connected in parallel for electromagnetically coupling the terminal to a noncontacting card and a processing circuit connected to the coil circuit for signal processing. A noncontacting transmission system includes a noncontacting card having a coil circuit including at least two spiral windings connected in parallel and a terminal having a coil circuit including at least two spiral winding connected in parallel, the coil circuits of the noncontacting card and the terminal being electromagnetically coupled for transmitting electrical power to the noncontacting card and exchanging data between the terminal and the noncontacting card.
A noncontacting card comprising: a printed circuit board; a plurality of spiral windings having respective centers and disposed on opposite sides of said printed circuit board with the centers of two of said spiral windings on opposite sides of said printed circuit board directly opposite each other, spiral windings on opposite sides of said printed circuit board being connected in series as respective coil circuits for electromagnetically coupling the noncontacting card with a terminal; selection means for selecting a desired number of said coil circuits from among said plurality of coil circuits and connecting the selected coil circuits in parallel; and a processing circuit connected to said selected coil circuits for signal processing.
Claim 2
Dependent Claim
113 words
A noncontacting card comprising: a printed circuit board; a plurality of spiral windings having respective centers and disposed on opposite sides of said printed circuit board with the centers of two of said spiral windings on opposite sides of said printed circuit board directly opposite each other, spiral windings on opposite sides of said printed circuit board being connected in series as respective coil circuits for electromagnetically coupling the noncontacting card with a terminal; selection means for selecting a desired number of said coil circuits from among said plurality of coil circuits and connecting the selected coil circuits in parallel; and a processing circuit connected to said selected coil circuits for signal processing.
Claim 3
Dependent Claim
15 words
The noncontacting card as defined in claim 1 wherein said selection means comprises a switch.