Visible to the public Criteria for Determining Maximum Theoretical Oscillating Frequency of Extended Interaction Oscillators for Terahertz Applications

TitleCriteria for Determining Maximum Theoretical Oscillating Frequency of Extended Interaction Oscillators for Terahertz Applications
Publication TypeJournal Article
Year of Publication2018
AuthorsBahman Soltani, Hooman, Abiri, Habibollah
JournalIEEE Transactions on Electron Devices
Keywords2π standing-wave modes, beam geometries, Cavity resonators, composability, Conductivity, critical unloaded oscillating frequency, current density, cylindrical beam, double-ridge slow-wave structures, electron beams, extended interaction oscillators, Extended interaction oscillators (EIOs), Geometry, high-frequency behavior, high-frequency vacuum-electronic source, high-power submillimeter wavelengths, load-lines, maximum theoretical oscillating frequency, Metrics, millimeter-wave, millimeter-wave radiations, O-type microwave tubes, one ring-loaded waveguide, oscillating behaviors, Oscillators, privacy, pubcrawl, Radio frequency, resilience, Resiliency, Resonant frequency, sheet electron beam, slow wave structures, slow-wave structure, specified EIO geometry, terahertz (THz) sources, terahertz applications, terahertz radiations, vacuum microelectronics, waveguides

Extended interaction oscillators (EIOs) are high-frequency vacuum-electronic sources, capable to generate millimeter-wave to terahertz (THz) radiations. They are considered to be potential sources of high-power submillimeter wavelengths. Different slow-wave structures and beam geometries are used for EIOs. This paper presents a quantitative figure of merit, the critical unloaded oscillating frequency (fcr) for any specific geometry of EIO. This figure is calculated and tested for 2p standing-wave modes (a common mode for EIOs) of two different slowwave structures (SWSs), one double-ridge SWS driven by a sheet electron beam and one ring-loaded waveguide driven by a cylindrical beam. The calculated fcrs are compared with particle-in-cell (PIC) results, showing an acceptable agreement. The derived fcr is calculated three to four orders of magnitude faster than the PIC solver. Generality of the method, its clear physical interpretation and computational rapidity, makes it a convenient approach to evaluate the high-frequency behavior of any specified EIO geometry. This allows to investigate the changes in geometry to attain higher frequencies at THz spectrum.

Citation Keybahman_soltani_criteria_2018