PROJECT TITLE :

High-Frequency Characteristics of the Axisymmetric TM Modes in a Coaxial Staggered Double-Grating Slow-Wave Structure

ABSTRACT:

The formulas of dispersion and interaction impedances of the axisymmetric TM modes in an exceedingly coaxial double-grating slow-wave structure (SWS) are obtained utilizing the sector matching technique, in which the higher order terms of the sector in the grooves are thought of. The high-frequency characteristics of lowest two modes—the elemental mode and also the TM01 mode—in the SWS were mentioned by adjusting its structure parameters. The calculated results show that the dispersion curve and also the interaction impedance are in sensible agreement with those simulated by the CST-MWS code. Yet, the parameter analysis demonstrates that the rational selection of the position of the beam tunnel and the relative position of the upper and lower gratings are helpful for the event of the traveling-wave tube and the back-wave oscillator to improve the bandwidth and enhance the interaction impedance.