Faulty excitation in FDTD simulation with a RF exciting source
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I am setting up a configuration whose operating frequency is within the RF range, e.g., 1.5 GHz. When I am modifying the source options, the excitation signal curves (both in frequency and time domains) are noisy and irrational. I know there are examples of RF applications for Lumerical FDTD, e.g., Wilkinson power divider. The excitation curves are reasonable and valid for that example. However, in a new fsp file with a 2D FDTD simulation region, when I enter the same values as input signal excitation parameters for a source, wrong and irrational plots are shown as excitation signals. Please see the attached screenshots. I appreciate any help you can provide.
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This is a frequently met problem when people setup a RF simulation. The root cause is the default simulation time in FDTD. By default it assumes the source is in optical frequency, so the default simulation time is 1000fs, which corresponds to frequency in a few hundreds of THz. At GHz range, The frequency range is 10^5 lower. Thus you will need to change the simulation time much longger, till the signal is fully showing the pulse.
To avoid very large numerical numbers, you can change the units to be used from "Setting" :
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