Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.00 vteřin. 
Modeling frequency selective surfaces in COMSOL Multiphysics
Höhn, Tomáš ; Oliva, Lukáš (oponent) ; Raida, Zbyněk (vedoucí práce)
Finite Element Method (FEM) implemented in COMSOL Multiphysics is used to analyze free-standing frequency selective surfaces (FSS) in a 3-dimensional (3D) space. Practical procedures for using periodic boundary conditions were developed and tested. A case study concerning mesh grid density (number of elements) vs. results' accuracy in a tight relationship with the calculation time needed was worked out. Outcomes were compared with results published in [5]. The procedure how to generate the m-file for a middle placed rectangular patch is described in the last part of the thesis. Also, PSO is used to adjust element's dimensions to shape the module of reection coefficient so it approaches the shape of the objective function.
Modeling frequency selective surfaces in COMSOL Multiphysics
Höhn, Tomáš ; Oliva, Lukáš (oponent) ; Raida, Zbyněk (vedoucí práce)
Finite Element Method (FEM) implemented in COMSOL Multiphysics is used to analyze free-standing frequency selective surfaces (FSS) in a 3-dimensional (3D) space. Practical procedures for using periodic boundary conditions were developed and tested. A case study concerning mesh grid density (number of elements) vs. results' accuracy in a tight relationship with the calculation time needed was worked out. Outcomes were compared with results published in [5]. The procedure how to generate the m-file for a middle placed rectangular patch is described in the last part of the thesis. Also, PSO is used to adjust element's dimensions to shape the module of reection coefficient so it approaches the shape of the objective function.

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