Effects of Multiple Internal Reflections on the Small-Signal Gain and Phase of a TWT

We formulate and solve a set of equations that model the effects of reflections from an arbitrary number of circuit discontinuities in a traveling-wave tube (TWT) operating under small-signal conditions. Applying this model to a case in which the discontinuities represent a series of small random pi...

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Bibliographic Details
Published in:IEEE transactions on electron devices 2012-05, Vol.59 (5), p.1542-1550
Main Authors: Chernin, D., Rittersdorf, I., Lau, Y. Y., Antonsen, Thomas M., Levush, B.
Format: Article
Language:English
Subjects:
Applied sciences
Boundary conditions
Electronic tubes, masers
Electronics
Equations
Exact sciences and technology
Gain
Gain variation
Integrated circuit modeling
Joints
Mathematical model
phase variation
Scattering
tolerance analysis
traveling wave tube
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Summary:We formulate and solve a set of equations that model the effects of reflections from an arbitrary number of circuit discontinuities in a traveling-wave tube (TWT) operating under small-signal conditions. Applying this model to a case in which the discontinuities represent a series of small random pitch variations due to fabrication errors in a helix TWT, we find that reflections may significantly increase the statistical effects on the gain and output phase first reported in the work of Pengvanich In another example, we report on a study of the effects of many small pitch errors on gain ripple in a 220-GHz folded waveguide TWT.
ISSN:0018-9383
1557-9646
DOI:10.1109/TED.2012.2186141