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On the application of Kirchhoff's approximation to scattering from discontinuities in large waveguide ducts
Author(s) -
Ling Hao,
Kim Hyeongdong
Publication year - 1994
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.4650070403
Subject(s) - classification of discontinuities , duct (anatomy) , scattering , transverse plane , inlet , wavelength , optics , waveguide , physics , mathematical analysis , mechanics , acoustics , computational physics , mathematics , engineering , structural engineering , mechanical engineering , medicine , pathology
A simple Kirchhoff‐based approximation is presented to account for the mode conversion at discontinuities such as bends and steps in open‐ended waveguide ducts. Comparisons with other more numerically exact approaches and with experimental results for a variety of two‐ and three‐dimensional inlet duct configurations show that this approximation is surprisingly accurate when the transverse dimension of the duct is above 5 wavelengths. This approximation reduces the computational burden of predicting the scattering from large inlet ducts. © 1994 John Wiley & Sons, Inc.