Accession Number : AD0289542

Title :   LOW-NOISE C-BAND TRAVELING-WAVE AMPLIFIER

Corporate Author : GENERAL ELECTRIC CO PALO ALTO CALIF TRAVELING WAVE TUBE PRODUCT SECTION

Personal Author(s) : HARMAN,W.A.

Report Date : 11 SEP 1962

Pagination or Media Count : 1

Abstract : Research is presented on the development of an ultralow-noise traveling-wave tube operating in the 5.4- to 5.9-gigacycle band. Data are presented on 29 tubes built and tested during the course of the program. Most of these tubes were test vehicles used to evaluate a number of lownoise gun geometries. Final tubes were constructed with a two-section helix which permitted independent 360-degree phase shift control without any measurable deterioration in noise figure. Of the basic gun geometries tested, the magnetron injection gun exhibited the most promising noise figure data. Using this gun, a room-temperature noise figure of 4.1 db was achieved at 1650 gauss focusing field, which decreased to 3.8 db at a field fo 3500 gauss. With the tube immersed in liquid nitrogen the noise figure dropped to 3.4 db at 1650 gauss, and to 3.1 db at 3500 gauss. The 0.7-db improvement in noise figure that was observed at liquid nitrogen temperatures is in accord with theory. (Author)

Descriptors :   *MICROWAVE AMPLIFIERS, *TRAVELING WAVE TUBES, AMPLIFIERS, DESIGN, ELECTRON BEAMS, HELIXES, NOISE (RADIO), REDUCTION

Distribution Statement : APPROVED FOR PUBLIC RELEASE