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Erschienen in:
1963 | OriginalPaper | Buchkapitel
Parametric refregeration discussion and experimental verification of the removal of slow-wave noise
verfasst von : P. A. Sturrock, G. C. van Hoven, A. Karp
Erschienen in: Microwaves
Verlag: Macmillan Education UK
Enthalten in: Professional Book Archive
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It was for some time believed that it is impossible to remove noise from the slow waves of an electron beam [1]. Since the operation of a large class of microwave amplifiers depends on the coupling of the negative energy slow wave to a circuit, this belief led to the statement of various minimum noise figure theorems [2]. As a result of these theorems, much effort has been expended on the development of amplifiers which use the fast beam waves [3]; these waves may, in principle, be stripped of all emission excited noise.