毫米波行波管返波振荡的仿真研究
doi: 10.3724/SP.J.1146.2007.00479
Simulation Investigation of Backward Wave Oscillation of Millimeter-wave TWT
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摘要: 该文利用HFSS仿真了工作在Ka波段的螺旋线、反绕双螺旋线及耦合腔等慢波系统，通过傅里叶分析得到空间谐波，进而分析和比较了上述慢波系统的返波振荡特性。结果表明：螺旋线慢波系统中出现明显的角向谐波次数和轴向谐波次数不相等的空间谐波分量，在模附近，有产生返波振荡的危险；而反绕双螺旋线通过提高基波耦合阻抗及可工作的归一化频率来提高了抑制返波振荡的能力；为了避免返波振荡，耦合腔工作频带的选择应尽可能远离单腔相移为,2的频点。Abstract: HFSS is used to simulate helical, contrawound helix and coupled-cavity Slow-Wave Structures(SWS), which work in Ka-band, to investigate the backward-wave oscillation of millimeter-wave TWT. The results show that, space harmonics, which axial space harmonic number and azimuth space harmonic number are unequal, are evident in helical SWS, the SWS runs a risk of backward oscillation near the mode. Relatively, contrawound helix shows excellent ability in restraining backward oscillation by improving interaction impedance and the normalized frequency which can work without backward oscillation. And coupled-cavity should avoid working around those frequencies where phase shifts per cavity are or 2.
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