The Gain Analysis of the 345 GHz Traveling-Wave Amplifier with Nonuniform Grating

The preliminary analysis of operation of the 345 GHz sectioned traveling-wave amplifier with the three-stage nonuniform grating has been presented. The design is based on both the simulation and the experimental results obtained for the W-band amplifier earlier. The THz amplifier is designed for the operation with the nonrelativistic sheet electron beams and the oversized beam-wave system. The result of calculations, carried out with the use of the large-signal theory, demonstrated the power gain up to 23 dB for the frequency region from 335 GHz to 365 GHz in the proposed amplifier. The output power of at least 1 W was predicted for the reasonable level of driving signal, that is less than 50 mW.