Three-Dimensional Electromagnetic Analysis of Attenuator-Coated Helix Support Rods of a Traveling-Wave Tube

Author

Naidu, Vemula Bhanu ; Datta, Subrata Kumar ; Rao, P. Raja Ramana ; Agrawal, Avadesh Kumar ; Reddy, S. Umamaheshwara ; Kumar, Lalit ; Basu, Baidyanath

Author_Institution

Defence Res. & Dev. Organ., Microwave Tube Res. & Dev. Centre, Bangalore

Volume

56

Issue

5

fYear

2009

fDate

5/1/2009 12:00:00 AM

Firstpage

945

Lastpage

950

Abstract

Attenuator-coated helix support rods in a helical slow-wave structure (SWS) were modeled by considering them to be made up of lossy dielectric material having equivalent bulk conductivity varied along the length following the loss of the coating. The same conductivity values were used in 3-D modeling of the helical SWS having the helix supported by three such support rods inside a metal envelope, and the attenuation constant of the structure was found. The approach was used for characterizing the attenuation constants in the sever regions of two typical SWSs, one operating in the X-Ku-band and the other in K-Ka-band. The method is general and would be useful for analyzing sever loss in any type of helical SWS having different geometries as well.

Keywords

attenuators; slow wave structures; attenuation constant; attenuator-coated helix support rods; bulk conductivity; helical slow-wave structure; lossy dielectric material; three-dimensional electromagnetic analysis; traveling-wave tube; Assembly; Attenuation measurement; Attenuators; Coatings; Conductivity; Dielectric losses; Electromagnetic analysis; Loss measurement; Optical reflection; Research and development; Structural rods; Helix slow-wave structure (SWS); helix traveling-wave tube (TWT); sever attenuation; sever loss;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/TED.2009.2015613

Filename

4808251