A new S-band backward-wave crossed-field amplifier

Recent advances in CFA technology have led to new versions of tubes which still operate in the same manner as the magnetron and early CFAs, but are capable of a greater range of performance and mode of operation. These advances are exemplified in the QKS1606 BW CFA which combines all of the recently developed features. The slow-wave circuit of the QKS1606 is a parallel transmission line consisting of 2 straps periodically loaded with 65 vanes. This tube does not employ a drift region. The insertion loss of the slow-wave structure is 1.6 dB.