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Optimization of passive microwave devices through geometrical parameterization—Application to the design of a cylindrical dual‐mode cavity filter
Author(s) -
Mahanfar Alireza,
Bila Stéphane,
Aubourg Michel,
Verdeyme Serge,
Boichon Christelle,
Puech Jérôme,
Lapierre Luc
Publication year - 2009
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.20319
Subject(s) - microwave , finite element method , filter (signal processing) , convergence (economics) , parametric statistics , quadratic equation , mode (computer interface) , polynomial , computer science , acoustics , mathematics , topology (electrical circuits) , geometry , mathematical analysis , physics , engineering , structural engineering , telecommunications , electrical engineering , statistics , economic growth , operating system , economics , computer vision
A new algorithm, based on geometrical parameterization and finite element method is presented for the optimization of microwave devices. Using geometrical parameterization, the field quantities are expressed as a polynomial in design parameters. Automatic differentiation is used for calculation of higher order derivatives. To ensure continuous gradients, an integrated mesh deformation algorithm is deployed to morph initial finite elements mesh into the perturbed geometry. The resulting parametric model is deployed through quadratic surface reconstruction to find local minimum at each stage. The convergence of the optimization through the reconstructed surfaces is discussed. As an example, a 5‐pole dual‐mode cavity filter is designed and optimized using the presented algorithm. © 2008 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2009.