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Hello pm796,
The Frequency-Domain Profile and Power Monitor provides frequency-domain representations of electromagnetic fields and power, focusing on steady-state field amplitudes and intensities rather than time-dependent oscillations. It captures spatially varying complex amplitudes (both magnitude and phase) of the field, obtained via Fourier transform from the time-domain field.
When observing the E- or H-component in the monitor, you're viewing the field's magnitude (along with a few other basic scalar operations) at a specific frequency — not a snapshot in time. This capability to analyze specific frequencies (using the slider) allows for examining the spectral response of your structure. For instance, you can see how fields or power vary across wavelengths to explore resonance or identify optimal operating frequencies.
For a better understanding of this monitor, please refer to the article: Understanding frequency domain CW normalization.
Best regards,
Kirill