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HFSS15: Selecting Solution Quantities to Plot

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When you create a report of Modal or Terminal solution data, each trace in the report includes a quantity that is plotted along an axis. The quantity being plotted can be a value that was calculated by HFSS such as S₁₁, a value from a calculated expression, or an intrinsic (inherent) variable value such as frequency or theta. The valid categories available depend on the type of quantity (real or complex) that is being plotted, the setup, the solution type, and the plot domain.

To select an S-parameter quantity to plot:

1. In the Report dialog box, Trace tab, select one of the following categories:

Variables	Intrinsic variables, such as frequency or theta, or user-defined project variables, such as the length of a quarter-wave transformer.
Output Variables	User defined expressions applied to derive quantities from the original field solution.
S-parameter	S-parameters from the S-matrix. For designs which include a Frequency Selective Surface (FSS)-referenced radiation boundary, S₁₁ and S₂₁ represent the extracted reflection and transmission coefficients, respectively.
Y-Parameter	Admittance matrix parameters computed from the S-parameters and port impedances.
Z-Parameter	Impedance matrix parameters computed from the S-parameters and port impedances.
VSWR	Voltage standing wave ratio, calculated from the equation.
Gamma	Propagation constants for the S-parameters.
Port Z_o	Characteristic port impedances.
Lambda	Guided wavelength.
Epsilon	Effective permittivity.
Group Delay	Quantity calculated as rate of change of the total phase shift with respect to angular frequency,
TDR Impedance	TDR (Time-Domain Reflectometry) impedance for non-terminal problems. The idea behind TDR is to excite a structure with a step function, and inspect the reflections as a function of time. If you select the Time Domain for the plot, the Category list includes the TDR Impedance and the TDR options button is enabled. Selecting the TDR Impedance category displays the (TDRZ) of every terminal or mode in the ports. The list of available Functions includes those that can operate on the TDRZ values.
Active S-parameter	Active S, Y, Z, VSWR is supported only for driven modal projects. Given a driven model project with a total of N port modes, let a_k denote the complex excitation fro the k-th mode specified in the Edit Sources dialog. Also let S denote the computed N x N scattering matrix. Ifdefine active-S_m, m = 1..., N by If S is renormalized or deembedded, the interpretation is that the stimulations are applied to the renormalized external transmission lines at the plane of deembedding. The other relative active quantities are simply transformations on the active S_m.
Active Y-parameter	Y₀^(M) is the port admittance of the m-th mode.
Active Z-parameter	Z₀^(m) is the impedance of the m-th mode.
Active VSWR	Active Voltage standing wave ratio is supported only for driven modal projects.
Passivity	A scalar quantity based on the matrix Q = I - conjugate(transpose(S)) * S For every frequency, the value must be no larger than 1.
Design	Enables you to plot or tabulate properties of objects, such as their volumes.
Expression Cache	The values of expressions listed in the Expression cache of the Solution setup can be plotted, for example, as a function of adaptive pass to monitor their convergence.
Expression Convergence	This is intended to plot convergence, as a function of adaptive pass, of expressions in the Expression cache of the Solution setup. In defining the report, for “Context”, select Solution: SetupN:Adaptive Pass. ExprDelta will show the change in the value of the expression as a function of adaptive pass, while ExprGoal will show, for comparison, the convergence goal for this expression, as defined in the Analysis Setup under the panel Expression Cache.