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Power losses of microwave radiation in dielectric window

To evaluate power losses of microwave generators, the transmission of radiation of the open end of a circle waveguide with the TM0n-type waves through a dielectric disc is considered. The field inside the disc presents a set of modes of a dielectric waveguide. Some part of modes is shown to participate in the energy transfer through a window, another part causes energy scattering at large angles to the generator axis. The part of energy spent for scattering depends on the radiated mode type, transverse disc dimensions, and distance to the radiator. Energy losses due to reflection depend as well on the window thickness.