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The end time of the time-dependent study step is set to times that of the period of the modulating sinusoidal function, which could be long enough for a simple passive device to ensure that the input energy is fully decayed. By simulating a circuit in the frequency domain and performing a frequency-to-time FFT, a voltage signal in the frequency domain can be investigated in the time domain. The voltage fluctuation times correspond to the propagation times for the incident pulse to be reflected from the two line discontinuities: The frequency-to-time FFT study step transforms the solution of the dependent variables in the frequency domain to the time domain with a very small time step of ten samples per period, defined by the highest frequency in the model. The first domain results are still accessible, typically through the Solution Store 1 data set. Get the Tutorial Model. Only the postprocessing variables that can be expressed with the dependent variables are valid for results analysis. Say you are simulating a device and want to get a very wideband frequency response with a small frequency step in the frequency domain or the time-domain reflectometry with a long time period. Logarithmic surface plot of the electric field norm and arrow plot of time-averaged power flow in a coaxial low-pass filter at 10 GHz. Each study step uses the Store fields in output option, which defines the selections where the computed results are stored.

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    Frequency domain study step settings. Time-dependent study step settings. When we analyze high-frequency electromagnetics problems using the finite element method FEMwe often compute S-parameters in the frequency domain without reviewing the results in the complementary domain; that is, the time domain. The voltage is converging to zero and S-parameters are in the frequency domain.

    However, from the frequency-domain data, it is difficult to identify sources for this signal degradation.

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    S-parameters and far-field radiation results are computed from the converted frequency domain data.

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    You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' or the latest version listed if standards is not an option.

    Frequency domain study step settings.

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    This works for typical passive circuits, except for closed-cavity-type devices, where the energy decay time can be much longer. The overshoot and undershoot of the signal indicate the discontinuities of the microstrip line. We can run a time-dependent study first and then transform the dependent variable magnetic vector potential A to convert a voltage signal at a lumped port from the time domain to the frequency domain.

    Each study step uses the Store fields in output option, which defines the selections where the computed results are stored. Try performing a time-to-frequency FFT for a wideband evaluation of S-parameters and a far-field radiation pattern in this tutorial model of a coaxial cable:.

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    By choosing only the lumped port boundaries for the Store fields in output settings, it is possible to greatly reduce the size of the model file. Zero-padding is automatically applied to the time-dependent study data before the FFT study step.

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    Lumped port settings in the Electromagnetic Waves, Transient physics interface. Since the transformed solutions typically contain many time steps, it is recommended to use the Store field in output option to reduce the size of the model.

    A sharp resolution of the frequency response of a device can be found from the time-to-frequency FFT, where the ending time of the transient input to the FFT process defines the frequency resolution of the final results.

    Each study step uses the Store fields in output option, which defines the selections where the computed results are stored. The excited energy gradually decays in general as time passes by, and it eventually vanishes.

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    Instead, we can stop the transient simulation when the energy is less than a certain threshold and fill the solutions with zeros in the remaining time before executing the FFT.

    By simulating a circuit in the frequency domain and performing a frequency-to-time FFT, a voltage signal in the frequency domain can be investigated in the time domain.

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    The impacts of the study step input arguments are described in the table below:. The frequency-to-time FFT study step transforms the solution of the dependent variables in the frequency domain to the time domain with a very small time step of ten samples per period, defined by the highest frequency in the model.

    The first domain results are still accessible, typically through the Solution Store 1 data set. The end time of the time-dependent study step is set to times that of the period of the modulating sinusoidal function, which could be long enough for a simple passive device to ensure that the input energy is fully decayed.

    Each study step uses the Store fields in output option, which defines the selections where the computed results are stored.

    Comments

    1. In the above figure, the time-domain results of the voltage bandpass impulse response at lumped port 1 are plotted with a microstrip line that has a couple of line discontinuities.

    2. S-parameters and far-field radiation results are computed from the converted frequency domain data.

    3. Reflection property S 11 and insertion loss S 21 are plotted in a GHz bandwidth.

    4. The voltage is converging to zero and S-parameters are in the frequency domain. Performing a wideband frequency sweep with a small frequency step size could be a time-consuming and cumbersome task.