Fabrication and Test of a W-band Three-Slot-Staggered-Ladder Coupled-Cavity TWT Circuit

In this paper, we report the fabrication and test of a W-band three-slot-staggered-ladder coupled-cavity TWT slow wave circuit. The process of fabrication involves coupled-cavity diaphragms, transition waveguides, and ceramic-window structures machining. Meanwhile the assembly is realized by the specially designed molds. The cold test was carried out using the Vector Network Analyzer (VNA). The measured S-parameters S
₁₁
is less than -10dB in the band of 92-99 GHz. The voltage stand wave ratio (VSWR) shows a good agreement with the simulation results. These results lay the foundation for the realization of the W-band three-slot-staggered-ladder coupled-cavity TWT.