Slow-wave structure (SWS) is a core part of traveling-wave-tube (TWT) amplifier. In this letter, the planar microstrip meander SWS on dielectric substrate at V-band (50-70 GHz) studied. The basic electromagnetic parameters are calculated. circuits designed and fabricated, good transmission characteristics measured. developed characterized by wide bandwidth relatively-large slow-wave factor, suitable for low-voltage TWT with sheet electron beam.

Results of numerical simulation a miniaturized sub-THz traveling-wave tube amplifier with sheet electron beam and planar grating slow wave structure (SWS) are presented. Cold characteristics the SWS calculated. Small-signal large-signal gain regimes studied by 1-D parametric frequency-domain code. The results verified simulations using 3-D particle-in-cell codes.

For advanced telecommunications and radar systems, high-power miniaturized millimeter-band traveling-wave tubes (TWTs) are required. In this letter, we propose a meander-line slow-wave structure (SWS) that is suitable for multiple sheet beam interaction helps achieve high power. The simulation of cold electromagnetic parameters the V-band SWS demonstrates good transmission characteristics, wide bandwidth, impedance. Hot performance TWT amplifier with proposed also studied. 3-D...

We report the results of design, simulation, fabrication, and cold-test measurements millimeter-band 2D planar microstrip slow-wave structures (SWSs) on dielectric substrates. Such have a high factor, which allows for low-voltage operation reduction in size weight device. A low-cost flexible fabrication technology based magnetron sputtering subsequent laser ablation has been developed is reported paper. Microstrip meander-line SWS circuits at V-, W-, D-bands fabricated characterized. The...

Planar meander line slow-wave structure (SWS) for traveling wave tubes at THz frequency band is studied. The SWS circuit 180-230 GHz designed and fabricated. Basic electrodynamic parameters of the are calculated. simulation shows a rather high coupling impedance.

Self-injection locking of a gyrotron by delayed signal is considered. The results theoretical analysis and numerical simulations explaining frequency stabilization time-delayed part the output power are presented. A simple quasi-linear model studied, formulas for frequency-stabilization rate bandwidth derived. theory verified simulation 0.67-THz gyrotron.

Complex-cavity resonator with mode conversion is a promising way of improving selection properties terahertz gyrotron. In this paper, enhancement the frequency tunability second-harmonic 0.4-THz gyrotron by using complex-cavity considered. Results detailed numerical study cold-cavity electromagnetic parameters are presented. Using results simulations, start-oscillation currents for different modes calculated.

We present the first experimental proof of hyperchaotic regimes in a gyrotron. Based on data analysis, we calculate spectrum Lyapunov exponents and estimate correlation dimension attractors non-stationary oscillation Ka-band prove existence chaotic behavior characterized by one two positive exponents, respectively. Estimations dimensions obtained show values higher than 4 developed chaos regimes.

Planar slow-wave structures (SWS) on dielectric substrates at V-band (50-70 GHz) are studied. The SWS circuits designed and fabricated. Basic electromagnetic parameters of the calculated. We consider meander interdigital SWSs, which for operation in O-type traveling-wave tube amplifier backward-wave oscillator, respectively.

Nowadays, there is a strong interest in miniature and high-power vacuum electron devices (VEDs) operating millimeter sub-THz bands. VED sources of coherent radiation are required for many applications, especially future advanced high-data-rate telecommunication systems. In this work, we present the results design study meander-line slow-wave structure (SWS) suitable multiple-sheet-beam operation to achieve high level output power. The cold-test electromagnetic simulation show possibility at...

Sources of millimeter and submillimeter (terahertz) band radiation are very important in modern society due to their broad application from telecommunication non-destructive evaluation chemical analysis. In this work, we present a review technological approaches for fabrication RF structures μVEDs. Technological the microfabrication planar slow-wave (SWS) on dielectric substrates operating with sheet electron beam considered. Such SWSs attractive simplicity structure, compact dimensions, low...

Field emitter arrays (FEA) are promising electron sources for vacuum microelectronic microwave amplifiers and oscillators. In this paper, analogs of “classic” devices considered. Traveling wave klystrons, klystrodes cross-field with FEA described. Basic output parameters (gain, efficiency, etc.) these calculated. A model a self-excited microtriode oscillator is developed. The studied numerically, as well by experimental investigation the circuit analog model. Chaotic generation in under...

In this paper, nonstationary and chaotic dynamics of a gyrotron with nonfixed field structure have been studied. We discuss the mechanism transition to self-modulation oscillations present plane parameters different kinds regimes in gyrotron. For attractors, set Lyapunov exponents has calculated. estimated dimensions attractors from Kaplan-Yorke formula found it be anomalously high. The explanation fact is based on presence large number high-Q eigenmodes resonator operating near critical...

Microfabricated sheet-beam traveling-wave tubes for THz and sub-THz operation have attracted a considerable interest. In this paper we discuss design issues of double-vane slow-wave structure (SWS) 0.2 amplifier. A fast accurate code calculation electrodynamic characteristics the SWS is developed.

A theoretical approach based on the electromagnetic theory of optical fibers has been applied in analysis evanescent modes a chalcogenide fiber bend used as probe fiber-based spectroscopic sensor, by example detection small amounts an antigel additive diesel fuel. The absorbance loop calculated for each mode was compared with results spectrometer-based measurements. role higher-order revealed. efficiency using shown to depend conditions light launching into probe.

Results of research aimed on development miniaturized O-type medium power sheet beam amplifier in sub-THz band are presented. Dispersion characteristics and coupling impedances for planar grating slow-wave structures (SWS) calculated. The double-grating half-period staggered SWS circuit is designed fabricated.

The guided and leaky modes of the optical waveguides (fibers) are analyzed by finite-element method (FEM) with integral boundary conditions. initial equations reduced to algebraic general eigenvalue problem, which is solved Arnoldi algorithm. mode dispersion characteristics, fields, cutoff frequencies calculated for several waveguide structures, including flat multilayer fibers different shapes cross sections.

Properties of microfabricated V-band (50-70 GHz) meander slow-wave structures (SWS) for low- voltage tubes with sheet electron beam are studied by numerical simulation and cold-test measurement. The SWS was using magnetron sputtering laser ablation processes. Transmission reflection proposed were measured experimentally calculated numerically. experimental results in good agreement the ones.

Properties of a microfabricated W-band (75-110 GHz) meander slow-wave structures (SWS) for low-voltage tubes with sheet electron beam are studied by numerical simulation and cold-test measurement. The SWS was following previously published protocol based on magnetron sputtering laser ablation processes. Transmission reflection losses proposed were measured experimentally evaluated numerically. experimental results in good agreement the ones.

Microfabricated vacuum-tube THz sources are of great interest for numerous applications such as communications, radar, sensors, imaging, etc. Recently, miniaturized sheet-beam traveling-wave tubes and sub-THz operation have attracted a considerable interest. In this paper, we present the results modeling development medium power (10-100 W) G-band tube amplifiers with sheet electron beam.