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High-frequency description of the Kirchhoff-type modal coupling between open ended waveguides

  • Author(s): Mioc, F
  • Capolino, F
  • Sabbadini, M
  • Maci, S
  • et al.
Creative Commons 'BY' version 4.0 license

The equivalence between physical optics (PO) and aperture integration (AI) is extended to evaluate the coupling between two open-ended waveguides of arbitrary cross-section. Furthermore, a Kirchhoff-type coupling coefficient is derived in terms of a double line integration of incremental coupling coefficients. A useful tool when the mutual impedance of two modal distributions has to be calculated in the framework of a method of moment procedure is provided which is formulated in terms of mode-shaped basis functions.

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