A broadband, two megawatt, 30 db gain klystron

A new approach incorporating the use of low Q ceramic loaded center cavities has been used to obtain bandwidths of the order of 10% in L-band. The loaded cavities are tuned to resonant frequencies which, when compensated by the response of a low Q input cavity, give an optimally bunched beam over a frequency bandwidth of more than 100 Mc. The design employed here differs from the conventional stagger-tuned klystron design in that the low Q´s of the center cavities enable them to be tuned out of the frequency band of interest with the result that the phase shift characteristics of the tube is flatter than when the cavities are stagger-tuned within the band.