Patent ID: 8776720

Claim:
A linear-type microwave-excited plasma source using rectangular waveguide with a biased slot as the plasma exciter, comprising: a reaction chamber; a rectangular waveguide, disposed above the reaction chamber, the waveguide having a biased slot configured on a bottom wall of the waveguide at the position with a biased distance from the center line of the rectangular waveguide thereof while enabling the waveguide to communicate with the reaction chamber through the biased slot, the bottom wall of the rectangular waveguide being a longer wall, and enabling the bottom wall to be divided by the biased slot into a wide region and a narrow region; the rectangular waveguide being coupled at its two ends to two microwave transmitters; a first vertical wall of the rectangular waveguide, being disposed connecting to the wide region; a second vertical wall of the rectangular waveguide, being disposed connecting to the narrow region; reaction gas inlets located in the biased slot as well as on the inside walls of the reaction chamber; a quartz plate, detachably inset into the biased slot while being arranged at a position between the slotted rectangular waveguide and the reaction chamber; and an adjustment device, movably arranged inside the rectangular waveguide so as to move perpendicular to a length of the biased slot, comprising a dielectric screw rod and a dielectric movable block in a manner that the movable block is connected to the screw rod while being movably received inside the rectangular waveguide so as to be driven to move by the screw rod along the wide region of the bottom wall, thereby controlling distribution of linear plasma density in the reaction chamber; wherein the dielectric screw rod is arranged passing through and normal to the first vertical wall so as to connect to the dielectric movable block by an end inside the rectangular waveguide, enabling distance between the second vertical wall and the dielectric movable block to be adjusted by the driving of the screw rod as the movable block is driven by the screw rod to move the dielectric movable block relative to the biased slot such that microwave energy radiating through the biased slot into the reaction chamber is controlled and adjusted to provide uniform distribution of the linear plasma density in the reaction chamber.