Effect of inhomogeneous dispersion shaping of a helical SWS on the backward-wave oscillation criterion

Author

Seshadri, R. ; Rao, Prahlada ; Rao, K.V. ; Datta, Soumya Kanti ; Kamath, Sanmati ; Jain, P.K.

Author_Institution

BE Complex, Microwave Tube R&D entre, Bangalore, India

fYear

2009

fDate

22-24 Dec. 2009

Firstpage

421

Lastpage

425

Abstract

The effect of inhomogeneous dispersion shaping of a helical SWS on the backward-wave has been studied. Theoretical simulations of three types of dispersion, namely, positive, flat and negative, achieved in an inhomogeneous structure and the interaction impedance characteristics thereof were carried out. The analysis of backward-wave oscillation criterion has been carried out to assess the effects of dispersion shaping and the beam-filling factor. A negative dispersion structure has been found to be advantageous in improving the threshold for backward wave oscillation.

Keywords

backward wave oscillators; dispersion (wave); slow wave structures; backward-wave oscillation criterion; beam-filling factor; flat dispersion; helical slow-wave structures; inhomogeneous dispersion shaping; interaction impedance characteristics; negative dispersion structure; positive dispersion; Circuits; Dispersion; Electron tubes; Frequency; Impedance; Microwave devices; Optical coupling; Power system harmonics; Shape; Structural rods;

fLanguage

English

Publisher

ieee

Conference_Titel

Emerging Trends in Electronic and Photonic Devices & Systems, 2009. ELECTRO '09. International Conference on

Conference_Location

Varanasi

Print_ISBN

978-1-4244-4846-3

Type

conf

DOI

10.1109/ELECTRO.2009.5441076

Filename

5441076