Corrugated cylindrical resonators for short-wavelength relativistic microwave oscillators

Comparitive Study of Coaxial Bragg Resonators

“…As many authors pointed out, the Bragg resonators with a step of corrugation phase always causes a narrow pass band in the stop bands, which can be controlled by selecting the Bragg reflector parameters [26][27][28][29][30][31][32][33]. This phenomenon corresponds to the sharp dip appearing in the stop bands in Figs.…”

“…If the regular waveguide section between the two reflectors is absent, the Bragg resonator is simplified to consist of only two Bragg reflectors, where connection of these two reflectors is smooth with corrugation-phase difference Δ=0, or is step-changed with phase difference Δ = +π or −π, respectively. In previous literatures the latter was refereed to as a Bragg resonator with a localized defect, or with a step of corrugation phase [26][27][28][29][30][31][32][33]. As was demonstrated by the experiment in Ref.…”

“…Previous studies on the Bragg resonators with a step of corrugation phase were mainly concentrated on planar or cylindrical structures [26][27][28][29][30][31]. Up to date, even though very few literatures have been devoted to the coaxial Bragg resonator with a step of corrugation phase, only transmission was discussed within the restriction that the operating mode was TEM mode [32], or that both the upstream and downstream reflectors have equal length [33].…”

Microwave pulse compression using a helically corrugated waveguide

“…When the corrugation amplitude l is small compared with the wavelength, the modes of the helically corrugated waveguide can be found using the method of perturbation and the coupled-mode theory [7,8] leading to the eigenmode dispersion equation:…”

New Approaches to High Power Microwave Computation and Experimentation

“…A widespread method to provide spatial coherence of output radiation in relativistic generators is the application of selective feedback through the use of Bragg reflectors placed at each end of an oversized electrodynamic system [15][16][17][18][19][20][21]. To achieve selective feedback while not interfering with the electron beam in different types of resonant traveling wave tubes such as Cherenkov generators, ubitrons, or free electron lasers, Bragg reflectors made from cylindrical periodically corrugated waveguides are iised.…”