Earlier [1] code Dev.5.0 has been developed. This code is intended for computation of the performances of coupled cavity TWTs (CCTWT) and hybrid 0-type devices. This code is based on the model of circuit cavity as lumped elements scheme of the common kind [2]. The ability of adequately simulate the output frequency characteristics of multiple-section CCTWT with the shifted band of intermediate section beyond the working frequency band is the most important test of code. In this report the results of simulation the performances of three-sectional Ku1-band f2 fa fl f3 f4 GHz Tel./Fax: +7 495 745 15 57 CCTWT and three-sectional X-band interdigital structure TWT (ISTWT) (both TWTs are produced by FSUE "Istok") are presented. The frequencies of 7r-mode cutoffs of the second sections are shifted up beyond the working bands. Particular feature of test is that the lower band is ''cavity" band and the upper band is 'slot" band in CCTWT (Fig. la) but in ISTWT the lower band is 'slot" band and the upper band is "cavity" band (Fig. lb). In the other words ISTWT has inverse bands sequence. GHz Figure 1. Dispersion curves of regular parts of the 1-st and the 3-d section of Ku-band CCTWT (a) and X-band ISTWT (b)
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