Traveling Wave Tube Amplifier Theory

A traveling wave tube twt is an electron device used for radio frequency amplification at microwave frequencies above 500 mhz and is the primary means of signal amplification utilized in communication satellites.

Traveling wave tube amplifier theory.

Traveling wave tubes abbr. The twt belongs to a category of linear beam tubes such as the klystron in which the radio wave is amplified by absorbing power from a beam of electrons as it. For years when discussing high field strength electromagnetic compatibility emc radiated susceptibility testing traveling wave tube amplifier twta technology has been the only available option for pulsed field generation. An rf signal is thus supplied to.

Traveling wave tube twt is an attractive solution for wideband and high power sources or amplifiers in the terahertz thz band. Like the multicavity klystron the traveling wave tube working is a linear beam tube used as a microwave amplifier. Traveling wave tube working twt. The operation of the da can perhaps be most easily understood when explained in terms of the traveling wave tube amplifier twta.

Twit are vacuum tubes used as high gain low noise wide bandwidth microwave wideband amplifiers a twt is capable of gains from 40 to 70 db with bandwidths exceeding two octaves. A traveling wave tube twt pronounced twit or traveling wave tube amplifier twta pronounced tweeta is a specialized vacuum tube that is used in electronics to amplify radio frequency rf signals in the microwave range. In this article a novel slow wave structure sws for twt named. Unlike the klystron however it is a device in which the interaction between the beam and the rf field is continuous.

The da consists of a pair of transmission lines with characteristic impedances of z 0 independently connecting the inputs and outputs of several active devices. The main attraction of these devices is their very high gain 30 60 db linear characteristics and 1 2 octave bandwidth. Twts are also used for ground broadcast stations guidance systems and military aircraft radar. The essential features of a typical travelling wave tube introduction in the past few years several radio amateurs have employed travelling wave tubes twts colloquially known as twits as microwave power amplifiers.

A bandwidth of 1 octave is one in which the upper frequency is twice the lower frequency. Traveling wave tube amplifiers are widely used in satellite applications to provide signal power amplification at high frequencies. Now there is a very attractive alternative to this technology.