Ansoft HFSS Convergence

Transcription

1 Data Max Delta Matrix Parameters Ansoft HFSS Choose from the Executive Commands window to view information about the solution. If you have solved for a driven solution, the following window appears: Maxwell Online Help System 23 Copyright Ansoft Corporation

2 Data Max Delta Matrix Parameters Ansoft HFSS The following fields indicate the solution status in terms of how many adaptive passes (solve error analysis refine cycles) are completed: The total is set using the Setup Solution command. Data The system displays the following information for each solution: The adaptive pass number. This is displayed only when an adaptive field solution is computed. Completed Remaining The type of solution generated by Ansoft HFSS. The following solution types may be listed: A S P Driven Solutions only. The frequency at which the problem is driven. This is set under Setup Solution. Displays the number of adaptive passes that have been completed. Displays the number of adaptive passes that have yet to be completed. If the solutions converge within the specified criteria, fewer passes than requested may be solved. Indicates that the solution was an adaptive solution. Indicates that the solution was a frequency sweep solution. Indicates that the solution was a ports-only solution. The number of tetrahedra in the finite element mesh that were used during the solution. Maxwell Online Help System 24 Copyright Ansoft Corporation

3 Data Max Delta Matrix Parameters Ansoft HFSS If ports have been defined. The maximum change in the magnitude of the S-parameters between two consecutive passes. The maximum delta S is defined as: where: i and j cover all matrix entries. N represents the pass number. For the first pass the maximum delta S is labeled N/A. If voltage, current sources, or incident waves have been defined and no ports exist. The difference in the relative error from one adaptive solution to the next. This is a measure of the stability of the computed field values from pass to pass. This is available only after the system completes two iterations of the adaptive solution process. Max ij mag S N S N 1 ij ij For each element in the matrix, the mag margin is the difference between the S-parameter delta magnitude and the target delta magnitude, which was specified in the S-Matrix Criteria panel. The mag margin reported in the panel is the maximum of these values over the entire matrix. The mag margin is defined as: Max ij mags N mags N 1 magm ij ij ij where M ij is the matrix convergence entry. The mag margin indicates the solution s proximity to the target delta magnitude. If the solution has converged within the target delta magnitude, a value of zero will be reported for the pass. Maxwell Online Help System 25 Copyright Ansoft Corporation

4 Data Max Delta Matrix Parameters Ansoft HFSS For each element in the matrix, the phase margin is the difference between the S-parameter delta phase and the target delta phase, which was specified in the S-Matrix Criteria panel. The phase margin reported in the panel is the maximum of these values over the entire matrix. The phase margin is defined as: Max ij phases N phases N 1 phasem ij ij ij where M ij is the matrix convergence entry. The phase margin indicates the solution s proximity to the target delta phase. If the solution has converged within the target delta phase, a value of zero will be reported for the pass. Max Delta Eigenmode Solutions only. The percent difference in the resonant frequencies from one adaptive solution to the next. This is a measure of the stability of the computed frequencies from pass to pass and is available only after the system completes two or more iterations of the adaptive solution process. For lossless problems, the maximum delta frequency is the largest percent change in the real part of the frequency for any of the calculated modes. For lossy problems, the maximum delta frequency is the greater of two quantities: the largest percent change in the real part of the frequency over all the modes, and the largest percent change in the imaginary part of the frequency. Maxwell Online Help System 26 Copyright Ansoft Corporation

5 Data Max Delta Matrix Parameters Ansoft HFSS You may also plot the convergence data versus pass. This allows you to view a graphical representation of the solution s convergence. > To plot the convergence data: From the Display menu, select one of the following: Table Displays all of the convergence data in a table. This is the default setting. If all the convergence data does not fit on the screen, use the scroll bars to view the data that doesn t appear. Plot Displays a plot of the number of tetrahedra versus adaptive pass. Plot Max Delta S Displays a plot of the maximum change in the S-parameters versus adaptive pass. This is only available for Driven Solutions in which ports have been defined. Plot Displays a plot of the difference in the relative error from one adaptive solution to the next. Plot Max igenmodes only. Displays a plot of the difference in the resonant frequencies from one adaptive solution to the next. Freq Plot Magnitude Displays a plot of the difference of the magnitudes of the S- Margin parameters normalized to the target delta S. Plot Displays a plot of the difference of the phases of the S-parameters normalized to the target delta S. Plot Matrix Displays the convergence of the S-parameters, Zpi, and Gamma Parameters versus adaptive pass. The plot appears in the model window, replacing any tables or previous plots. To plot the tetrahedra or matrix parameters, you must have solved at least two adaptive passes. To plot the maximum delta S, maximum delta E, or maximum delta frequency, you must have solved at least three passes. Use the Zoom In, Zoom Out, and Fit All buttons to change your view of the plot. Use the Show Coords button to display information about selected points on the plot. Maxwell Online Help System 27 Copyright Ansoft Corporation

6 Matrix Parameters Ansoft HFSS Matrix Parameters Choose Display/Plot Matrix Parameters to create a plot of selected matrix parameters from the adaptive pass solutions. > To plot the matrix parameters: 1. Choose Display/Plot Matrix Parameters. The following window appears: More 2. Select the matrix parameters to plot from the Select Matrix Parameter list. Choose Clear at any time to deselect 3. Select the type of plot to create. 4. Optionally, if you have defined ports and terminals, select Terminal S-matrix to plot the terminal S-matrix for the problem. Maxwell Online Help System 28 Copyright Ansoft Corporation

7 Matrix Parameters Ansoft HFSS 5. Choose OK to accept the settings and create the plot, or Cancel to cancel the plot. You return to the Executive Commands window. As with the tabular convergence display, if you are viewing the plot when another adaptive pass completes, data for it will be added to the plot. Maxwell Online Help System 29 Copyright Ansoft Corporation