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首页> 外文期刊>International journal of surface engineering and interdisciplinary materials science >Attenuation Measurement of Lossy Coatings of Carbon for Ka- Band Helix TWT Applications
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Attenuation Measurement of Lossy Coatings of Carbon for Ka- Band Helix TWT Applications

机译：Ka带螺旋TWT应用中碳的有损涂层的衰减测量

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摘要

In a high efficiency traveling wave tube (TWT) amplifier, any reflections present in the device may cause oscillations and hence instability. A coating of lossy material on appropriate parts of the tubes (known as attenuators) is done to suppress these reflections. Carbon is a very commonly used material for this type of coating, and may be deposited by a number of techniques. In the present work, coatings of carbon were done on the dielectric substrate and evaluated for the attenuation performance at microwave frequencies. Three dielectric rods (APBN material) were coated with carbon by pyrolytic deposition method for different thickness. An experimental setup involving a rectangular wave-guide with a hole has been used for measuring the attenuation of the coated rods in the Ka-band frequency range. The same structure has been simulated using the Ansoft High Frequency Simulator (HFSS) and both the experimental and simulated results have been compared.
机译：在高效率行波管（TWT）放大器中，设备中存在的任何反射都可能引起振荡，从而导致不稳定。在管的适当部分（称为衰减器）上涂覆有损耗的材料以抑制这些反射。碳是用于此类涂层的非常常用的材料，并且可以通过多种技术进行沉积。在当前的工作中，在介电基板上完成了碳涂层，并评估了在微波频率下的衰减性能。通过热解沉积法将三个介电棒（APBN材料）涂有碳，以形成不同的厚度。已经使用一种包括带有孔的矩形波导的实验装置来测量涂覆棒在Ka频带频率范围内的衰减。使用Ansoft高频模拟器（HFSS）对相同的结构进行了模拟，并对实验结果和模拟结果进行了比较。

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