Validity of Surface Impedance Model for Electromagnetic Analysis of a Corrugated Gyrotron Cavity

T. Tkachova, V. Shcherbinin, V. Tkachenko
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引用次数: 7

Abstract

An approximate surface impedance model (SIM) is widely used in practice to calculate and optimize the electromagnetic properties of corrugated RF structures. According to this model, the corrugated walls are replaced by a homogeneous surface with averaged anisotropic impedance, which depends on the corrugation parameters. In this study, the SIM validity is investigated for TE waves of a circular waveguide with longitudinal wall corrugations. The investigation is based on the full-wave approach, which accounts for the coupling between the fundamental and higher space harmonics. It is shown that this coupling may invalidate the results of the surface impedance model, even though the widely accepted condition of SIM validity is fulfilled.
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表面阻抗模型在波形回旋管腔电磁分析中的有效性
近似表面阻抗模型(SIM)在实际应用中被广泛用于计算和优化波纹射频结构的电磁特性。根据该模型,波纹壁被具有平均各向异性阻抗的均匀表面所取代,该阻抗取决于波纹参数。本文研究了具有纵壁波纹的圆波导中TE波的SIM有效性。该研究基于全波方法,它考虑了基次和高次空间谐波之间的耦合。结果表明,即使满足广泛接受的SIM有效性条件,这种耦合也可能使表面阻抗模型的结果无效。
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