DocumentCode :
45049
Title :
Transmission Line Model for Folded Waveguide Circuits
Author :
Antonsen, Thomas M. ; Vlasov, Alexander N. ; Chernin, D.P. ; Chernyavskiy, Igor A. ; Levush, Baruch
Author_Institution :
Sci. Applic. Int. Corp., McLean, VA, USA
Volume :
60
Issue :
9
fYear :
2013
fDate :
Sept. 2013
Firstpage :
2906
Lastpage :
2911
Abstract :
We describe an equivalent circuit model for traveling wave structures based on folded or serpentine waveguides (F/SWs), including a beam tunnel. The model consists of a combination of transmission line segments and lumped electrical elements. Values of the five parameters that characterize the model are found by minimizing the differences between the dispersion and coupling impedance as calculated by the model and those obtained from a 3-D finite element code. We find that the model reproduces the dispersion to better than 0.1% and the coupling impedance to better than 1% over a broad frequency range in different examples in which the dependence of the impedance on frequency tends either to zero or to infinity near the band edge at 2π. The model is also able to capture the effects of asymmetric fields and misalignment of the beam tunnel. We conclude that the model can be used with confidence in codes that simulate the beam-wave interaction in FW and SW traveling wave tubes.
Keywords :
dispersion (wave); equivalent circuits; finite element analysis; travelling wave tubes; waveguides; 3-D finite element code; FW traveling wave tube structure; SW traveling wave tube structure; beam tunnel; beam-wave interaction; coupling impedance; dispersion impedance; equivalent circuit model; folded-serpentine waveguide circuit; lumped electrical element; transmission line segment model; Computational modeling; Couplings; Dispersion; Impedance; Integrated circuit modeling; Mathematical model; Power transmission lines; Coupling impedance; dispersion; folded waveguide (FW); serpentine waveguide (SW); traveling wave tube (TWT);
fLanguage :
English
Journal_Title :
Electron Devices, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9383
Type :
jour
DOI :
10.1109/TED.2013.2272659
Filename :
6560361
Link To Document :
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