The design of W-band broadband output window for TWT

The diamond pillbox window for W-band TWT has been designed in this article, which can cover the 75GHz-120GHz with a ultra-bandwidth over 40GHz. By simulating and optimizing in detail, the reflection coefficient (S11) less than −20dB and the VSWR less than 1.2 was obtained in the whole transmission bandwidth with no any oscillation observed. The influence of key structural parameter on the whole bandwidth was also analyzed thoroughly.