Patent ID: 6825618
Filing Date: 2004-11-30
Classification: H01J

Abstract:
A circuit for coupling a pair of induction coils to an RF power supply, comprising:an RF power supply having two outputs, one of the outputs being connected to electrical ground, and the other one of the outputs being ungrounded; an impedance matching network having an input and an output, the input of the matching network being connected to the ungrounded output of the power supply; first and second induction coils, each induction coil having a first end and a second end, wherein the first end of the first coil is connected to the first end of the second coil, and the second end of the first coil is connected to the output of the impedance matching network; and a capacitor connected between electrical ground and the second end of the second coil, wherein the capacitor has a capacitance value which resonates with the second coil at the frequency of the RF power supply.