Patent ID: 8438990

Claim:
An apparatus, comprising: a chamber; a plurality of electrodes disposed in the chamber; an RF power source coupled to the plurality of electrodes such that adjacent electrodes are driven out of phase with each other; a first matchbox consisting of a load capacitor and a tuning capacitor, the first matchbox coupled to the RF power source; a second matchbox consisting of two capacitors and an inductor positioned therebetween, the second matchbox coupled to the plurality of electrodes and the tuning capacitor of the first matchbox; a susceptor disposed opposite the plurality of electrodes; and at least one electrically insulating member coupled between adjacent electrodes and electrically isolating the adjacent electrodes, the at least one electrically insulating member having a plenum formed at least partially therein and at least one opening facing the susceptor, the at least one electrically insulating member having a length greater than a width.