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Summary form only given.The development of terahertz power amplifiers presents significant new challenges as it brings into focus design, fabrication, and measurement issues that are not important factors at lower frequencies. We will describe our design approach to meet these challenges with particular emphasis on a 0.67 THz Extended-Interaction Klystron (EIK).One of the key design challenges is...
Traveling-wave tubes (TWTs) based on the transverse interaction between an electron beam and a circularly polarized circuit wave were investigated starting in the 1960s. Small-signal theory based on a pencil beam suggested that these devices would have high efficiency and good linearity. Further analysis showed that the effect of a finite beam radius would limit these advantages. We present results...
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