Why does FDTD inject a pulse when I want a steady state, single frequency CW source?
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It is very important to understand that you can obtain the CW (single frequency, steady-state) response of the system, even though the source signal was a short, broadband pulse.nFDTD always excites the system with a short pulse, even when you are interested in steady state, continuous wave (CW) results. The steady state response is obtained by doing a fourier transform of the time domain fields. This approach is more efficient than directly using a CW source in the time domain simulation. Details can be found at Understanding frequency domain CW normalizationnSource setupnUse the Frequency/Wavelength tab to set the frequency range of interest. If you're only interested in results at one frequency, just set the start and stop values to the same number. n
nMonitor setupnIf you want steady state CW results, (at one frequency or many frequencies) use a frequency monitor. These monitors calcualte the steady state response of the system via a fourier transform of the time domain fields. Typically you just need to specify the number of frequency points to collect. If the source start & stop frequency are the same number, then the monitor will automatically collect data at just that one frequency.n
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