多注集成阵列梳齿型行波管模拟与冷测研究

Simulation and cold test of integrated multi-beam TWT with multi-corrugated waveguide SWS

多电子注集成实现微波放大是毫米波行波管获得大功率微波的一种实用化途径,研究了一种多注集成阵列梳齿型慢波结构(MCW)。该慢波结构具有天然的电子注通道,同时耦合阻抗明显高于单注的梳齿型慢波结构(DCW)。为了验证该特性,使用Ka波段三注集成阵列梳齿型互作用回路进行了仿真和实验研究。互作用电路的材料选取高电导率无氧铜,通过CNC铣削的工艺进行加工。冷测实验发现仿真和测试的结果具有很好的一致性,且在32~39 GHz的带宽内,S11小于-15 dB。在仿真软件CST PIC工作室中,50个周期的慢波结构与三个电子注(每个电子注的电压为12.9kV,电流为67mA)进行注波互作用模拟仿真。仿真表明,MCW在32~36 GHz的带宽内比DCW具有更高的输出功率,增益和电子效率。该器件的最大输出功率约为132.8 W,相应的电子效率为5.12%,增益为41.2 dB,大于DCW的1.2%和25 dB。MCW行波管的高功率和高效率特性,使其在基于点对多点传输的毫米波无线系统中具有潜在的应用价值。

An integrated multi-beam traveling wave tube based on Multi-Corrugated Waveguide SWS(MCW)is investigated by simulation and cold test in this paper.The MCW SWS is adopted here for its high coupling imped⁃ance and its natural multi-beam tunnels,then a Ka-band integrated three-beam traveling wave tube amplifier with MCW is designed.The interaction circuit is fabricated by CNC milling with oxygen-free high conductance cop⁃per.The cold test is found to be in great consistency with simulation and the S11 is lower than-15 dB from 32~39 GHz.Using CST PIC Studio,the PIC simulation is performed for the interaction circuit with 50-periods SWSs and three beams with 12.9 kV voltage and 67 mA current.The simulation shows significantly better output pow⁃er,gain,and electronic efficiency than DCW.The maximum output power is about 132.8 W with corresponding electronic efficiency of 5.12%and gain of 41.2 dB.The high power and high efficiency performance of the pro⁃posed MCW TWT provides potential application for point-to-multipoint transmission based millimeter-wave wire⁃less system.