An electrodeless lamp waveguide structure includes tuned absorbers for spurious RF signals. A lamp waveguide with an integral frequency selective attenuation includes resonant absorbers positioned within the waveguide to absorb spurious out-of-band RF energy. The absorbers have a negligible effect on...http://www.google.com.au/patents/US5910710?utm_source=gb-gplus-sharePatent US5910710 - Method and apparatus for powering an electrodeless lamp with reduced radio frequency interference
