Title :
Simple Formulas for Stopband Attenuation Characteristics of Asymmetric Helical Slow-Wave Structures of Traveling-Wave Tubes
Author :
Datta, Subrata Kumar ; Naidu, Vemula Bhanu ; Rao, P. Raja Ramana ; Kumar, Lalit ; Basu, Baidyanath
Author_Institution :
Microwave Tube R&D Centre, Defence R&D Organ., Bangalore, India
fDate :
6/1/2010 12:00:00 AM
Abstract :
Simple closed-form formulas for the estimation of the π-mode stopband and the stopband attenuation in an azimuthally asymmetric helical slow-wave structure (SWS) are developed, following the coupled-mode analysis of multiple reflections. The formulas are simple and amenable to easy computation, and also allow the use of the dispersion characteristics of the structure obtainable from any standard electromagnetic modeling, thereby accruing the accuracy of 3-D electromagnetic analysis. The analysis is benchmarked against published results with close agreement. Based on the analysis, SWS configurations that would reduce the deleterious effects of asymmetry and also would improve TWT efficiency are suggested.
Keywords :
slow wave structures; π-mode stopband attenuation; 3D electromagnetic analysis; TWT efficiency; azimuthally asymmetric helical slow-wave structure; electromagnetic modeling; multiple reflection coupled-mode analysis; stopband attenuation characteristics; traveling-wave tubes; Attenuation; Coupled mode analysis; Dielectrics; Electromagnetic analysis; Electromagnetic reflection; Frequency; Optical reflection; Periodic structures; Research and development; Structural rods; Angularly asymmetric helix; coupled-mode analysis; helix slow-wave structure (SWS); helix traveling-wave tube (TWT); metal segment asymmetry; periodic structures; support-rod asymmetry;
Journal_Title :
Electron Devices, IEEE Transactions on
DOI :
10.1109/TED.2010.2047069
