【摘要】 提出了一种Ka波段的周期金属圆柱结构微带曲折线行波管,在原有微带曲折线结构的基础上,将周期金属圆柱结构加载在微带线的平行线中间,可以有效地增加金属面积,降低电荷积累效应,提升曲折线行波管的输出功率及增益平坦度.对该结构进行了冷特性仿真及波注互作用仿真,仿真结果表明,使用MML-PMR结构可以减少42. 65%的介质表面.基于该结构设计了工作在Ka波段的行波管.使用MML-PMR结构改善了介质电荷积累现象,电荷积累导致的升压降低为原有结构的12. 5%.该结构在30 GHz能够实现最大66. 2 W的输出功率,最大增益为26. 74 dB,在22～42 GHz的工作频率范围内该结构的增益范围为24. 83～26. 74 d B,增益波动低于2 dB,较为平坦.射频效率可以提升到12. 79%.更多还原

【Abstract】 A microstrip meander-line( MML) traveling wave tube( TWT) with periodical metallic rods( PMRs) is presented to improve the output power and bandwidth of TWT. Based on original MML structure,PMRs are added between the two parallel metal lines,perpendicular to the transmission direction,for each unit cell. The MML-PMR structure can increase the metal cover area for MML and decease the dielectric charging effect of MML TWT. Cold tests and beam-wave interaction simulations were conducted for this structure. The simulation results show that the dielectric area can be decreased by 42. 65% using MML-PMR. A traveling wave tube is simulated based on the MML-PMR at Ka band. The dielectric charging problem can be greatly improved by MML-PMR,the voltage induced by dielectric charging accumulation can be reduced to 12. 5% that of MML structure. The output power of the MML-PMR TWT is 66. 2 W at 30 GHz,corresponding to a maximum gain of 26. 74 dB; the output power gain varies from 24. 83 to 26. 74 dB across the entire working frequency range from 22 to 42 GHz. The RF efficiency can be increased to 12. 79% for the MML-PMR TWT.更多还原