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Passive devices can be designed using lumped element features if both the operating frequency of the device and the insertion loss of lumped elements are low. To do this, you include a Time Dependent study step using a lumped port in the Electromagnetic Waves, Transient interface, and then include a Time to Frequency FFT study step to perform the transform of the results from the first study step.Īpplication Library path for an example calculating S-parameters from transient simulations using a time-to-frequency FFT: RF_Module/Filters/coaxial_low_pass_filter_transient Updated Tutorial Model: A Low-Pass Filter Using Lumped Elements Then, the S-parameters are calculated using a time-to-frequency fast Fourier transform (FFT) on the results. Good for calculating wide-band frequency responses with a fine frequency resolution, models are first built using a transient physics interface.
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The electric field pattern (cone) resembles that of a short dipole antenna.Ĭalculate S-Parameters from Transient Simulationsįrequency-domain S-parameters of a circuit can now be calculated from time-dependent simulations by using a two-step solving process.
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Surface magnetic current density (blue arrows) on a cylindrical coil through use of the Surface Magnetic Current Density boundary condition in the Electromagnetic Waves, Frequency Domain interface.