Time-domain Electromagnetic Field Distribution Calculation for Waveguide-Fed Resonant Cavities

Please login with a confirmed email address before reporting spam

Dear experts, I currently need to perform time-domain electromagnetic field calculations for a resonant cavity fed by a waveguide. However, unlike in frequency-domain calculations, I cannot directly apply a rectangular waveguide port excitation. Is there a suitable method to achieve equivalent excitation, so as to obtain results consistent with those of frequency-domain calculations?


1 Reply Last Post 2025年6月29日 GMT+8 00:45
Robert Koslover Certified Consultant

Please login with a confirmed email address before reporting spam

Posted: 5 hours ago 2025年6月29日 GMT+8 00:45

There are a number of ways to do this. Here are two: (1) You can set one end of the waveguide as a scattering boundary condition and define an appropriate surface field distribution on it, along with a time-domain function. That will launch your wave just fine. (2) You could model a coax to waveguide adapter, and use a lumped coaxial port to drive your time domain function on the coax. Either way, the waveguide will exhibit dispersion as the wave propagates, so bear that in mind.

-------------------
Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
There are a number of ways to do this. Here are two: (1) You can set one end of the waveguide as a scattering boundary condition and define an appropriate surface field distribution on it, along with a time-domain function. That will launch your wave just fine. (2) You could model a coax to waveguide adapter, and use a lumped coaxial port to drive your time domain function on the coax. Either way, the waveguide will exhibit dispersion as the wave propagates, so bear that in mind.

Reply

Please read the discussion forum rules before posting.

Please log in to post a reply.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.