A step-type, broadband, X-band ceramic waveguide window

This paper describes a broadband-type ceramic output window for use in X-band microwave power tubes. This vacuum-tight window is capable of passing average cw power outputs of more than 250 watts, and can withstand temperatures as high as 750°C. The window introduces a standing-wave ratio of less than 1.2 over a frequency range of more than 2,000 megacycles per second, and, due to lengthening of the arc path, shows little tendency toward arc-over.