Due to the multipactor discharge breakdown, ferrite circulators have become the most susceptible component losing efficacy in high-power applications such as satellite payload systems. To date, effective suppression method of multipactor without affecting the electrical performance while keeping a high level of stability during in-orbit operation is still a technological challenge. In this article, a novel method based on the composite dielectric transformation is proposed for the considerable improvement of the multipactor breakdown threshold. The transformation medium is composed of dielectric rings of different permittivity, which could realize the uniform field transformation from the susceptibility region of multipactor to the dielectric/vacuum interface without acute change and discontinuity. In addition, the transformation medium is designed to guarantee little perturbance of the electrical performance and great convenience of fabrication and assembly. The experimental results of the ${S}$ -band circulator using this method demonstrated that while keeping very low insertion loss and isolation level, this method has improved more than 9 dB (≥850%) of multipactor threshold, showing very promising application potentials in antimultipactor designs for the spacecraft payload system.

中文翻译：

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一种使用变换介电的新型多极抑制环行器

由于多极放电故障，铁氧体循环器已成为最易受影响的组件，在卫星负载系统等大功率应用中失去了功效。迄今为止，在轨道运行期间保持高水平稳定性的同时不影响电气性能的有效的多齿抑制方法仍然是一项技术挑战。在本文中，提出了一种基于复合介电变换的新颖方法，可以大大提高多导极击穿阈值。转换介质由介电常数不同的介电环组成，可以实现从多电极的磁化率区域到介电/真空界面的均匀场转换，而不会发生急剧的变化和不连续性。此外，转换介质的设计可确保几乎不干扰电气性能，并极大地方便了制造和组装。实验结果 $ {S} $ 使用该方法的宽带环行器表明，在保持极低的插入损耗和隔离度的同时，该方法已将多脚架阈值提高了9 dB（≥850％）以上，在航天器有效载荷系统的反多脚架设计中显示出非常有前途的应用潜力。