Efficiency Enhancement of a Millimeter-Wave, Two-Beam Extended Interaction Oscillator Based on All-Period Field Optimization

In this paper, a scheme by optimizing electric field distribution with a two-output structure of the extended interaction oscillator (EIOs) is proposed to permit a significant increase in the efficiency at Ka-band. The distribution of the axial electric field and the synchronous conditions are optimized to make more fast electrons of the entire two-beam EIO circuit fall into the deceleration region and transfer energy to the electric field. Simulation results show that the efficiency is firstly improved from 28