Well microwave radiation is certainly a large, wide ranging subject in its own right. So I was going to ask you "In what context are you interested in microwave emitters and their construction ?". But clearly microwave emission is happening all the time around us or there would be no microwaves! If the EmDrive works at all, which I doubt, it is all in the tranmission aspect (ie waveguides). So pony up and focus your question please. I take it you are not interested in th