Reduced-Order Modeling
When designing bandpass-filter type high-Q devices in the frequency domain, it may be necessary to apply many frequency samples to describe the passband accurately. The reduced-order modeling technique can help accelerate the modeling of such devices as a fine frequency resolution can be used for a modest simulation time.
Two simulation methods: the asymptotic waveform evaluation (AWE) and frequency-domain modal methods, both are designed to help overcome the conventional issue of a longer simulation time when using a very fine frequency resolution or running a very wideband simulation. The AWE is efficient when it comes to describing smooth frequency responses with a single resonance or no resonance at all. The frequency-domain modal method, meanwhile, is useful for quickly analyzing multistage filters or filters of a high number of elements that have multiple resonances in a target passband.
In this section:
•
Adaptive Frequency Sweep Using Asymptotic Waveform Evaluation (AWE) Method
•
Frequency Domain, Modal Method
Adaptive Frequency Sweep
and
Frequency Domain, Modal
in the
COMSOL Multiphysics Reference Manual
