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Filter Design Using Ansoft HFSS - University of …

Filter Design Using Ansoft HFSSDr. Rui ZhangDepartment of Electrical and Computer Engineering University of WaterlooWaterloo, Ontario, Canada N2L 3G1 OutlineIntroductionFinite Element Method (FEM) Employed by HFSSD esign Examples:Eigen Mode: Dielectric ResonatorDriven Mode: Dielectric Resonator FilterMicrostrip Line Structure1 Features of HFSSG eneral Design ProcedureIntroductionThe Ansoft High Frequency Structure Simulator ( hfss ) is a full-wave electromagnetic (EM) software package for calculating the electromagnetic behavior of a 3-D hfss , you can compute:Basic electromagnetic field quantities and, for openboundary problems, radiated near and far fields;The eigenmodes, or resonances, of a structure;Port characteristic impedances and propagation constants;Generaliz

Filter Design Using Ansoft HFSS. Dr. Rui Zhang. Department of Electrical and Computer Engineering University of Waterloo. Waterloo, Ontario, Canada N2L 3G1

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Transcription of Filter Design Using Ansoft HFSS - University of …

1 Filter Design Using Ansoft HFSSDr. Rui ZhangDepartment of Electrical and Computer Engineering University of WaterlooWaterloo, Ontario, Canada N2L 3G1 OutlineIntroductionFinite Element Method (FEM) Employed by HFSSD esign Examples:Eigen Mode: Dielectric ResonatorDriven Mode: Dielectric Resonator FilterMicrostrip Line Structure1 Features of HFSSG eneral Design ProcedureIntroductionThe Ansoft High Frequency Structure Simulator ( hfss ) is a full-wave electromagnetic (EM) software package for calculating the electromagnetic behavior of a 3-D hfss , you can compute:Basic electromagnetic field quantities and, for openboundary problems, radiated near and far fields;The eigenmodes, or resonances, of a structure;Port characteristic impedances and propagation constants.

2 Generalized S-parameters and S-parameters renormalizedto specific port impedance;2 FEM3 FEM is a numerical method for solving Maxwell Scheme:2D-triangles3D-tetrahedraFeatures of HFSS4 Capabilities:Accurate full-wave EM simulationImport/export of 3D structures Automatic adaptive mesh generation and refinementAdaptive Lanczos-Pad Sweep for fast frequency sweepsInclusion of skin effect, lossesDirect and iterative matrix solversEigen mode matrix solverFeatures of hfss (cont.)5 Solution Data (Visualization):S-, Y-, Z-parameter matrix (2D plot, Smith Chart)Port characteristic impedanceCurrent, E-field, H-field (3D static and animated field plot in vector display or magnitude display)Far-field calculation (2D, 3D, gain, radiation pattern)Material losses, radiation lossesGeneral Design Procedure6 Design Examples (Eigen mode: DR)7 Opening a hfss ProjectTo open a new project in a hfss window:Select File > New, select Project > Insert hfss DesignTo open an existing project.

3 Design Examples (Eigen mode: DR) Manager9 Design Examples (Eigen mode: DR) TypeDriven Modal: S-matrix solutions will be expressed in terms of the incident and reflected powers of waveguide Terminal: S-matrix solutions of multi-conductor transmission line ports will be expressed in terms of terminal voltages and Mode: finding the resonant frequencies of the structure and the fields at those resonant Set the Solution TypeSelect hfss > Solution TypeDesign Examples (Eigen mode: DR) ModelerDesign Examples (Eigen mode: DR) Model CreationYZXZD esign Examples (Eigen mode: DR) VariablesDesign Examples (Eigen mode: DR) SettingsAdd new variablesDesign Examples (Eigen mode: DR) and Modifying Dimensions in 3D Modeler Tree3D Modeler TreeDesign Examples (Eigen mode: DR) Materials15 Design Examples (Eigen mode: DR) of the Objects16 Design Examples (Eigen mode.)

4 DR) Boundary Conditions17 Surface approximations- Perfect electric or magnetic surfaces- Radiation surfaces- Symmetry planes- Background or outer surfacesMaterial properties- Boundary between two dielectrics- Finite conductivity of a conductorExcitations (Driven mode)- Wave ports (External)- Lumped ports (Internal) Design Examples (Eigen mode: DR) Boundaries18 Design Examples (Eigen mode: DR) Setup19 Design Examples (Eigen mode: DR) Meshing20 The mesh in hfss is automatically constructed and tuned to give the most accurate and efficient mesh adaptive meshing algorithm searches for the largest gradients in the E-field or error and sub-divides the mesh in those regions.

5 It also targets singularities, such as the edge of a conductor, as locations to add extra mesh growth for each adaptive pass is controlled by the Tetrahedron Refinement in percentage, which ensures that between each pass the mesh is sufficiently perturbed and guarantees the correct the mesh has been refined, a full solution is performed and the process is repeated until Examples (Eigen mode: DR) each adaptive pass, hfss compares the results (Frequencies for eigen mode, S-Parameters for driven mode) from the current mesh to the results of the previous mesh.

6 If the answers have not changed by the user defined value or Delta Freq (for eigen mode)/Delta S (for driven mode), then the solution has converged and the current or previous mesh can be used to perform a frequency sweep (for driven mode). If the solution has converged, then technically, the previous mesh is as good as the current mesh. In this case, hfss will use the previous mesh (less than current mesh) to perform frequency sweeps (for driven mode) if they have been Examples (Eigen mode: DR) Check and Starting AnalysisDesign Examples (Eigen mode: DR) the Solution Processand Checking Solution Data23Q will be provided for lossy casesDesign Examples (Eigen mode: DR) MeshDesign Examples (Eigen mode: DR) Distributions25 Design Examples (Driven mode.)

7 DR Filter )263D Model of the DR FilterExcitation27 ProbePortThe height of the cylinder is 0 = a sheet in a circular shapeDesign Examples (Driven mode: DR Filter ) Port28 Design Examples (Driven mode: DR Filter ) Port29 Design Examples (Driven mode: DR Filter ) assumes that the Wave Port is connected to a semi-infinite long waveguide that has the same cross-section and material properties as the ports calculate characteristic impedance, complex propagation constant, and generalized PortLumped ports are similar to traditional wave ports,but can be located internally and have a complex user-defined Setup30 Single FrequencyDesign Examples (Driven mode: DR Filter ) Setup (cont.

8 Frequency SweepDesign Examples (Driven mode: DR Filter ) Examples (Driven mode: DR Filter ) Data32 Design Examples (Driven mode: DR Filter ) Solution Data33 Design Examples (Driven mode: DR Filter ) Field Display34 Design Examples (Driven mode: DR Filter ) Analysis35 Design Examples (Driven mode: DR Filter ) Examples (Driven mode: DR Filter ) (cont.)37 Design Examples (Driven mode: MSL) 3D Model of the MSL38 Design Examples (Driven mode: MSL) Port Field Display39 Design Examples (Driven mode: MSL) Solution Data40


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