NDLI: The Minimum Noise Figure of Microwave Beam Amplifiers

Content Provider	IEEE Xplore Digital Library
Author	Haus, H.A. Robinson, F.N.H.
Copyright Year	1931
Abstract	A matrix description of microwave amplifiers such as klystrons, traveling-wave tubes, and backward-wave amplifiers, in which an electron beam interacts with longitudinal RF fields, is developed. Certain relations between the matrix elements are derived as a consequence of the conservation of energy and these relations set a lower limit to the noise figure attainable with amplifiers of this class. It is shown that the minimum noise figure of any amplifier of this type with lossless RF structures is identical with that already found by several authors for the traveling-wave tube and is entirely determined by the noise parameters of the beam. These in turn depend only on conditions in the immediate neighborhood of the cathode. Special cases involving lossy structures are investigated and in each case the presence of loss is shown to increase the noise figure. The method is also applied to calculate the minimum noise figure of a double-stream amplifier.
Starting Page	981
Ending Page	991
Page Count	11
File Size	2279715
File Format	PDF
ISSN	00968390
Volume Number	43
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1955-08-01
Access Restriction	Subscribed
Rights Holder	The Institute of Radio Engineers, Inc. (IRE)
Subject Keyword	Noise figure Microwave amplifiers Electron beams Radiofrequency amplifiers Klystrons Electron tubes Laboratories Radio frequency Low-noise amplifiers Noise reduction
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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