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Title: Rectangular modes and dyadic green's functions in a rectangular chirowaveguide: Part I-theory
Authors: Li, L.-W. 
Leong, M.-S. 
Kooi, P.-S. 
Yeo, T.-S. 
Tan, K.-H.
Keywords: Dyadic green's functions
Electromagnetic-wave theory
Microwave propagation
Rectangular waveguide
Vector wave functions
Issue Date: 1999
Citation: Li, L.-W.,Leong, M.-S.,Kooi, P.-S.,Yeo, T.-S.,Tan, K.-H. (1999). Rectangular modes and dyadic green's functions in a rectangular chirowaveguide: Part I-theory. IEEE Transactions on Microwave Theory and Techniques 47 (1) : 67-73. ScholarBank@NUS Repository.
Abstract: An analytic solution of electromagnetic-wave propagation in a rectangular chirowaveguide is represented in this paper in terms of spectral-domain dyadic Green's functions (DGF's) in a general form. The method used here is a combination of a wavefleld decomposition method and DGF eigenfunction expansion technique. This DGF decomposition method avoids having to use the modified and normalized vector wave functions, which are found difficult to satisfy the boundary conditions of chirowaveguides in which the reconciliation of Dirichlet and Neumann conditions is impossible. On the other hand, this method can be generalized to chirowaveguide of arbitrary cross section and is found reducible to a nonchiral case. It is observed that in a similar fashion to the conventional rectangular waveguide, the duality between the electric and magnetic types of DGF's in the rectangular chirowaveguide does not exist. To show the reducibility of the generalized DGF's for bi-isotropic media, we summarized the procedure of utilizing the formulas and proved in detail that the form of the DGF's can be reduced to that for chiral media and achiral (isotropic) media. Exactly the same DGF's are obtainable for the isotropic media by reducing the general formulas. In Part II of this paper, a practical application of the DGF's will be presented. The electric and magnetic fields in the rectangular chirowaveguide due to a point dipole excitation oriented in the y -direction will be derived. The detailed numerical analysis will include the novel features of the dispersion relations, the effects of chirality on the novel features of the rectangular chirowaveguides, some newly discovered features, and vector field plots and contour plots of higher order modes of electric and magnetic fields. © 1999 IEEE.
Source Title: IEEE Transactions on Microwave Theory and Techniques
ISSN: 00189480
DOI: 10.1109/22.740078
Appears in Collections:Staff Publications

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