Sheet Beam Traveling Wave Tube Focused by Cross-Field

In this paper, cross-field is tried to focus a sheet beam traveling wave tube (TWT) for obtaining both high gain and high net efficiency due to electron selection. The device is analyzed by a non-linear code. And the results show that, at the input power of 0.8W and in varied operation bands from 8GHz to 250GHz, compared with traditional cross-field amplifiers, higher gains are obtained, and compared with the same sheet beam TWT without cross-field focusing, higher efficiency is obtained. At 12GHz, the sheet beam TWT focused by cross-field gets both high gain and high efficiency when the input power varied from 0.01W to 0.8W.