Computer simulation of the helix traveling-wave amplifier with harmonic signals

Both fundamental and second-harmonic output powers have been computed with an axially symmetric three-dimensional model of a helix traveling-wave amplifier. They agree reasonably well with measurements. For three beam power levels, the computed transfer curves show RF drive powers consistently about...

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Bibliographic Details
Published in:IEEE electron device letters Vol. 1; no. 6; pp. 104 - 106
Main Author: MacGregor, D.M.
Format: Journal Article
Language:English
Published: IEEE 01.06.1980
Subjects:
Computer simulation
Equations
Power amplifiers
Power generation
Power measurement
Power transmission lines
Radio frequency
Radiofrequency amplifiers
RF signals
Voltage
ISSN:0741-3106
Online Access:Get full text
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Summary:Both fundamental and second-harmonic output powers have been computed with an axially symmetric three-dimensional model of a helix traveling-wave amplifier. They agree reasonably well with measurements. For three beam power levels, the computed transfer curves show RF drive powers consistently about 3 dB below the measured powers and saturated output powers about 2 dB below the measured values. Inaccuracies in the assumed initial beam radius, density and velocity may have caused these differences. Suppressing the second harmonic raises the computed fundamental output power by 3 dB. The model accurately reproduces a measured 11 dB dip in the second harmonic as the fundamental signal saturates.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0741-3106
DOI:10.1109/EDL.1980.25247