Sensitive millimeter wave diagnostics in magnetic confinement plasma fusion experiments need protection from gyrotron stray radiation in the plasma vessel. Modern electron cyclotron resonance heating (ECRH) systems take advantage of multi-frequency gyrotrons. This means that the frequency band of some millimeter wave diagnostics contains more than one narrow-band gyrotron-frequency line, which needs to be effectively suppressed. A compact standard waveguide notch filter based on coupled waveguide resonators with rectangular cross-section is presented which can provide very high suppression of several gyrotron frequencies and has low insertion loss of the passband.

中文翻译：

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用于毫米波等离子体诊断的紧凑型两频陷波滤波器

磁约束等离子体融合实验中的灵敏毫米波诊断需要保护免受等离子体容器中回旋辐射的影响。现代电子回旋共振加热（ECRH）系统利用了多频回旋管。这意味着某些毫米波诊断程序的频带包含多于一条的窄带回旋管频率线，需要对其进行有效抑制。提出了一种基于矩形横截面的耦合波导谐振器的紧凑型标准波导陷波滤波器，该滤波器可以对几个回旋频率进行非常高的抑制，并具有较低的通带插入损耗。