The theory of characteristic modes is a popular physics-based deterministic approach, which has found several recent applications in the fields of radiator design, electromagnetic interference modeling, and radiated emission analysis. To apply the characteristic mode analysis of a given structure, proper selection of significant modes is an essential requirement for the correct conclusion of the resultant field. This paper reviews the development of the conventional modal significance measure together with other related significance criteria that have been proposed over the last few decades. In particular, the thought process that relates to the development of initial measures to the excitation of the induced current vector will be explained. The common problems with the existing measures will also be identified. Later a suitable modal metric will be suggested and validated with an example. The proposed measure will be further applied for approximating the shielding response of the aperture examples for both the infinite and finite cases.

中文翻译：

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主要特征模式的选择

特征模式理论是一种流行的基于物理学的确定性方法，最近在辐射器设计、电磁干扰建模和辐射发射分析等领域得到了一些应用。为了应用给定结构的特征模式分析，正确选择有效模式是正确得出合成场的基本要求。本文回顾了传统模态显着性度量以及过去几十年中提出的其他相关显着性标准的发展。特别是，将解释与开发感应电流矢量激励的初始措施相关的思考过程。现有措施的共同问题也将被确定。稍后将建议并通过示例验证合适的模态度量。建议的措施将进一步应用于近似无限和有限情况下孔径示例的屏蔽响应。