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Sensitivity analysis of the scattering parameters of microwave filters using the adjoint network method
Author(s) -
El Sabbagh Mahmoud A.,
Bakr Mohamed H.,
Nikolova Natalia K.
Publication year - 2006
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.20182
Subject(s) - microwave , sensitivity (control systems) , scattering , scattering parameters , filter (signal processing) , resonator , waveguide , matching (statistics) , waveguide filter , ridge , mathematics , physics , optics , computer science , electronic engineering , prototype filter , filter design , engineering , telecommunications , statistics , computer vision , paleontology , biology
A novel approach is presented to calculate the sensitivities of the scattering parameters of microwave filters obtained with the full‐wave mode‐matching (MM) technique. Using only the MM simulation of the original network, the sensitivities of the scattering parameters with respect to all designable parameters are obtained. The adjoint network method (ANM) is applied to the generalized scattering matrices of the different filter components. This guarantees good accuracy of the calculated sensitivities. The implementation details are discussed for N ‐resonator ridge waveguide filters. Excellent agreement is obtained between the sensitivities calculated using ANM and those obtained using the expensive central differences. © 2006 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2006.