Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Irregular grating modeling using ports or background field
Posted 06.01.2014, 10:04 GMT-5 RF & Microwave Engineering, Wave Optics, Acoustics & Vibrations Version 4.3b, Version 4.4 1 Reply
Please login with a confirmed email address before reporting spam
I am a novice at comsol and has been building my first model for some time. I want to calculate the scattered field caused by a plane wave incident upon an irregular grating (with dozens of periods). First I used port as the excitation, but found that the scattered field is reflected at the port, which appears to be a tricky problem to solve based on the discussion on the Internet.
So instead I use the background field approach. However, after setting a plane wave (like exp(-j*emw.k*y)) as the background field and solving the model, I find that the background field is present both in the air and inside the grating material (with n=1.5). So now I am very suspicious about the correctness of my model, since it is the sum of the background field and scattered field that has to satisfy the wave equation. Can anyone help me? Many thanks!
Tan Jia
Hello Jia Tan
Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.
If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.
Please login with a confirmed email address before reporting spam
Thank you very much!
Katerina