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Modes computation in arbitrarily shaped waveguides by a transformation optics approach
Author(s) -
Gentili Gian Guido,
Giannetti Giacomo,
Khosronejad Misagh,
Pelosi Giuseppe,
Selleri Stefano
Publication year - 2021
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.22480
Subject(s) - computation , optics , transformation (genetics) , physics , transformation optics , integrated optics , geometrical optics , computer science , metamaterial , algorithm , chemistry , biochemistry , gene
This article applies a new method to analyze modes in empty waveguides having perfectly conducting walls and a rather generic cross‐section. The method is based on a coordinate transformation that maps the generic profile of the waveguide cross‐section to a circular waveguide (CW) filled with an anisotropic material. Modes in this latter waveguide can be represented as a series over the corresponding free‐space CW modes. This representation is particularly useful if used as a modal expansion over the port of a 2.5D or 3D device treated with a transformation optics approach. The method is particularly efficient when the waveguide is “similar” to a CW. Applications are shown to the analysis of some waveguides of arbitrary cross‐section with a view on practical applications.