Abstract: A dielectric layer is located between two capacitor electrodes and is heated by a radio frequency transmitted from a radio frequency generator. In order to conduct a high energy from the generator into the load, a coaxial line having a length which corresponds to 1/4 of the wavelength of the desired frequency is utilized and its characteristic impedance is formed from the geometrical mean of real load resistance and optimum working resistance of the generator.

Abstract: A device for attenuating electromagnetic cavity interference waves, which occur in the vacuum system of a high-frequency electron tube, in particular a transmitting tube, comprising a wave-guide portion coupled to the cavity of the electron tube, which may or may not form a part of the vacuum system of the electron tube, and which wave-guide portion may have a length corresponding approximately to a quarter wave length of the interference waves, and is provided with a high-ohmic resistive coating, the high resistance of which is transformed by the wave-guide portion into a low resistance with respect to the cavity interference waves which are to be attenuated, in the cavity of the electron tube.