Kanyevs'kyj V. Methods of expansion of a frequency range in diode structure with negative conductivity

Thesis is devoted to methods of expansion of a frequency range in diode structure with negative conductivity. Two-dimensional model of Gunn diode with complex cathode is developed. It's shown that expansion of the frequency range of Gunn diode in some times is possible if to use structure of the cathode which consists of island areas and launcher of carriers. It is shown also that the use of advanced periphery of areas of the cathode that ingects the current, allows to avoid deterioration of frequency propeties of the diode in result of heating. Model of vacuum diode with the spike cathode that carried out as p-n-junction is developed. Opportunity of electrical reorganization of a frequency range of vacuum diode negative conductivity in operating time is shown.