Novel G-Band Slot-Loaded Folded Waveguide Traveling Wave Tube

In this letter, we report a novel G-band high-power traveling wave tube (TWT) using a modified slot-loaded folded waveguide (SLFWG) slow-wave structure (SWS). Firstly, it can be found that the coupling impedance of the modified SWS is greatly improved compared with the conventional structure by simulation results. Next, the whole tube is designed and fabricated using the SLFWG SWS. Finally, under the condition of 10% duty cycle, the experimental results show that the device has a maximum output power of 215 W at the frequency of 219 GHz, a 3-dB bandwidth of more than 3 GHz, and a power-bandwidth product of 666.5 W·GHz, which is basically consistent with the simulation results.