Patent ID: 6867401

Claim:
A waveguide system for passing microwave energy while blocking foreign particles from a moving gas passing through the system, comprising: first and second waveguide sections; a low loss microwave window disposed between the first and second waveguide sections to allow microwave energy to pass from the first waveguide section through the window to the second waveguide section; and a gas bypass filtration system having a first port in communication with the first waveguide section, the first port having a plurality of orifices sized so as to provide preliminary filtering of particals out of a stream of gas; a filter element in communication with the first port; and a second port in communication with the filter element and with the second waveguide section; whereby a gas flowing through the first waveguide section is blocked by the window and flows through the gas bypass filtration system and enters the second waveguide section after passing through the filter.