W波段行波管切断位置性能分析与实验

Analysis and experimental study on performance of the W-band TWTs' sever region

摘要:

为分析折叠波导行波管互作用电路切断位置的功率和频谱特性，提出并研制出一只四端口W波段脉冲行波管。对该行波管频带内互作用电路的S参数、切断处功率和对应频谱特性进行测试，分析表明：端口2(输入段的切断)的功率幅值主要取决于饱和状态下行波管的输入功率，与输入段增益不成正比关系分布；端口3(输出段切断)功率主要取决于端口匹配性能，其数值计算功率和测试数据吻合良好。本文研究为毫米波及太赫兹行波管切断设计提供了一种有效方法。

Abstract:

To analyze the power and spectrum performance of the Folded Waveguide(FWG) Traveling Wave Tube(TWT) sever region, a W-band TWT with four-port structure is proposed and developed. The S-parameter of interaction circuit, power and spectrum characteristic at the sever region are obtained and analyzed. The analysis shows that the power amplitude of port 2(sever of the input segment) mainly depends on the input power of the TWT at the saturated state, which is not proportional to the gain of the input segment.The power of port 3(sever of output segment) mainly depends on the matching performance of the ports, and the calculated power is in an excellent agreement with the measured data. The study in this paper provide a practical method for designing sever region of the millimeter wave and terahertz TWTs.