Patent ID: 9265138
Filing Date: 2016-02-16
CPC Classification: H05H

Claim Text:
1. An apparatus, comprising: an electromagnetic waveguide having a length and height; a first iris slot crossing the waveguide at a first position along the length of the waveguide having a height less than that of the waveguide; a second iris slot crossing the waveguide at a second position along the length of the waveguide having a height less than that of the waveguide; and a plasma torch having a longitudinal axis crossing the waveguide at a position between the first and second iris slots; wherein the first iris slot and the second iris slot are configured to transmit electromagnetic fields substantially transverse to the longitudinal axis of the plasma torch to excite plasma in the plasma torch; and wherein the heights of the first iris slot and the second iris slot are less than 70% of the diameter of the torch.