Selection of Dominant Characteristic Modes
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 modelling and radiated emission analysis. The modal theory is based on the approximation of the total induced current in an electromagnetic structure in terms of a weighted sum of multiple characteristic current modes. The resultant outgoing field is also a weighted summation of the characteristic field patterns. Henceforth, a proper modal measure is an essential requirement to identify the modes which play a dominant role for a frequency of interest. The existing literature of significance measures restricts itself for ideal lossless structures only. This paper explores the pros and cons of the existing measures and correspondingly suggests suitable alternatives for both radiating and scattering applications. An example is presented in order to illustrate the proposed modal method for approximating the shielding response of a slotted geometry.
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Citation : Ghosal, S., De, A., Duffy, A. and Chakrabarty, A. (2019) Selection of Dominant Modes. IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY,
Research Institute : Institute of Engineering Sciences (IES)
Peer Reviewed : Yes