A low-noise traveling-wave amplifier with octave bandwidth coverage

In recent years a considerable amount of work has been done on the development of low-noise traveling-wave amplifiers. Most of the tubes developed to date have had a relatively narrow frequency band over which both low-noise and high gain have been achieved simultaneously. Recently work in this laboratory has been done toward building traveling-wave tubes with high gain as well as low-noise figure over a 2:1 frequency band.