Calculation of interaction in 0.22 THz high efficiency traveling wave tube
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摘要: 利用CST Microwave Studio 计算双排矩形梳状慢波结构的色散并据此确定了0.22 THz左右频段（D波段）行波管用慢波结构的尺寸参数。将相速再同步技术应用于基于双排矩形梳状慢波结构的D波段行波管中，用CST PIC模拟计算了4例具有不同周期构型的D波段行波管。结果证实：对于无集中衰减器的D波段行波管，在218~232 GHz范围内，相速再同步技术使得输出功率从10~13 W提高到19~28 W，电子效率从1.4%~2.2%提高到2.6%~3.9%；对于具有集中衰减器D波段行波管，在218~232 GHz范围内，相速再同步技术使得输出功率从8~16.8 W提高到32~41 W，电子效率从1.5%~2.8%提高到4.4%~5.7%。此外，无论行波管有无集中衰减器，相速再同步技术都明显改善了行波管的增益平坦度。
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关键词:
- D波段行波管 /
- 相速再同步技术 /
- 双排矩形梳状慢波结构 /
- 色散 /
- PIC 模拟
Abstract: Using CST Microwave Studio，the dispersion characteristics of a staggered double rectangular grating slow wave structure(SDRG SWS) is calculated, and the structure parameters of SDRG SWS for a 0.22 THz（D band） traveling wave tube(TWT) are determined based on the dispersion data. Then phase velocity re-synchronization techniques are applied in D band TWT based on SDRG SWS, and four D band TWTs which have different period configurations are simulated by CST PIC solver. The results demonstrate that the phase velocity re-synchronization techniques have raised output power level from 10-13 W to 19-28 W, as well as electron efficiency from 1.4%-2.2% to 2.6%-3.9% within 218-232 GHz in those TWTs which has a concentrated attenuator, and have raised output power level from 8-16.8 W to 32-41 W, as well as electron efficiency from 1.5%-2.8% to 4.4%-5.7% within 218-232 GHz in those TWTs which has not a concentrated attenuator. Besides, whether a TWT has a concentrated attenuator or not, phase velocity re-synchronization techniques have obviously improved its gain flatness. -
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