This article presents a novel dielectric support for RF circuits of helix traveling wave tubes (TWTs) for the backward wave cancellation. RF circuit comprised two sections: the first section is a conventional dielectric material and the second section is a ferrite rod which replaces the dielectric support. Considering nonreciprocal electromagnetic property of ferrites, the proposed solution acts as a one-way tunable bandstop filter which only affects the propagating waves in one direction. By tuning this filter in the backward wave frequency, the backward wave can be suppressed without any effect on the forward wave. The electromagnetic characteristics and hot test behavior of ferrite-added slow wave structure (SWS) are observed through the numerical simulations. The proposed structure successfully damps the backward wave oscillation and higher gain is achieved in comparison with conventional TWTs.

中文翻译：

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一种利用铁氧体材料消除行波管放大器后向波的新方法

本文介绍了一种用于反向波消除的螺旋行波管 (TWT) 射频电路的新型电介质支持。RF 电路由两部分组成：第一部分是传统的介电材料，第二部分是替代介电支撑的铁氧体棒。考虑到铁氧体的非互易电磁特性，所提出的解决方案充当单向可调带阻滤波器，仅影响一个方向的传播波。通过在后向波频率中调谐该滤波器，可以抑制后向波而不会对前向波产生任何影响。通过数值模拟观察了添加铁氧体的慢波结构（SWS）的电磁特性和热测试行为。