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Port boundary conditions
Posted 2015年6月1日 GMT-4 10:59 RF & Microwave Engineering Version 4.3 0 Replies
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Till today, I worked with COMSOL 3.5 to examine planar waveguides. I used match boundary conditions for excitation and termination at both sides of the waveguide in the RF frequency domain. This boundary condition worked just fine, but I find it very difficult to implement the same BC in COMSOL 4.3 or newer versions. For now, I understood already that I have to use port boundary conditions, and set the power instead of the amplitude. However, I didn't really get the settings for excitation and termination. Upon exictation I switch on the "wave excitation at this port" and set the amplitude function (In my case it is of Hz) and the power (I do not set the phase). I actually think I got it right over here. On the other side of the waveguide (The termination port) , I switched off the excitation, and set the magnetic field to zero (as was in the match BC). In this case I get an error message from COMSOL. I also tried to use the same excitation field (Hz) in the termination port, and got some messy results.
I really don't understand how to use it correctly. Anyone?
Thanks in advance,
Tal.
I attached a simple model of PEC-dielectric-PEC waveguide which is excited on its left end with simple known analytic mode to demonstrate the issue.
Attachments:
Hello Tal Weiss
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