Accession Number : AD0287057

Title :   DEVELOPMENT OF S-BAND LOW-NOISE PERIODIC PERMANENT MAGNETIC TRAVELING-WAVE TUBE

Corporate Author : WATKINS-JOHNSON CO PALO ALTO CALIF

Personal Author(s) : ISRAELSEN,B.P.

Report Date : 20 SEP 1962

Pagination or Media Count : 1

Abstract : The pin-seal RF input match was evaluated with excellent results. The match is better than 2:1 vswr over an octave bandwidth. A noise figure of 3.2 db was obtained at kmc using this type of match. Reversed magnetic fields were studied, using two permanent magnets. Several schemes for minimizing the reversal distance were tried. The most successful uses two small magnets at the reversal plane, opposed in the same manner as the primary magnets. With this type of assembly, beam transmission of 99 percent was achieved in dc focusing tests. (Author)

Descriptors :   *MICROWAVE AMPLIFIERS, *TRAVELING WAVE TUBES, ANODES, DESIGN, ELECTRON BEAMS, ELECTRON GUNS, FOCUSING, HELIXES, IMPEDANCE MATCHING, MAGNETIC FIELDS, MAGNETS, NOISE (RADIO), REDUCTION, S BAND, STANDING WAVE RATIOS

Distribution Statement : APPROVED FOR PUBLIC RELEASE