Vacuum microelectronics

On June 1, 2022, the Department of Electronics, Oscillations and Waves of SSU turned 70 years old. Over the years, the Department has passed a brilliant way. Three of its leaders at different times were rectors of Saratov State University. Graduates and staff of the department are known in the scientific world not only in our country, but also far beyond its borders.

The School of Corresponding Member of the Russian Academy of Sciences, Doctor of Physical and Mathematical Sciences, Professor Dmitry Ivanovich Trubetskov is a unique phenomenon widely known to the scientific community both in Russia and abroad. Its includes science, education and a lot of educational activities. The uniqueness of the School of D. I. Trubetskov is that it covers a wide range of current scientific areas: vacuum electronics, magnetoelectronics, nonlinear dynamics, etc. The School of D. I.

Results of the theoretical analysis of the diode oscillator with a field-emission cathode placed in a photonic crystal resonator are considered. The analysis of conditions of self-excitation in the small signal approximation is carried out. The nonstationary numerical model of the oscillator based on the nonstationary equation of excitation of the resonator and the particle-in-cell method is developed. Numerical simulation of the processes of oscillation build-up is performed.

Design of a diode oscillator with a field­emission cathode placed in a photonic crystal (PC) resonator is described. Results of numerical calculation of basic electrodynamic parameters of the PC resonator are presented. The 3D electrodynamic simulation by using the modern software package HFSS shows that varying the design of the energy output allows control of the loaded Q­factor in a wide range. Selection of the optimal value of the loaded Q­factor provides rather high output power and efficiency for reasonable values of the field­emission cathode current density.

The development of the terahertz frequency range is one of the priority problems of modern vacuum microwave electronics. For increasing power and efficiency of such devices, it is favorable to use spatially developed slow-wave structures (SWSs) and electron beams with a large cross section. For miniaturization of vacuum-tube devices, reducing of the accelerating voltage becomes a problem of principal importance. In this respect, planar SWSs on dielectric substrates are very promising.