Hi all,
I try to simulate a simple case of rectangular cavity resonator. I've found the resonance frequency analyticaly and by using eigenfrequency method that is published in COMSOL model gallery (Model ID: 9618). But when I try to simulate spectral response, I get a strange result:
I use rectangular port BC with TM mode, mode number: 11
1. I get "peak" instead of "dip"
2. At frequencies that are higher than resonance frequency (in agreement with my prev. calcs), I get no response (attached an image)
I use COMSOL 4.2a
Does anybody have any idea what might be the problem?
I try to simulate a simple case of rectangular cavity resonator. I've found the resonance frequency analyticaly and by using eigenfrequency method that is published in COMSOL model gallery (Model ID: 9618). But when I try to simulate spectral response, I get a strange result:
I use rectangular port BC with TM mode, mode number: 11
1. I get "peak" instead of "dip"
2. At frequencies that are higher than resonance frequency (in agreement with my prev. calcs), I get no response (attached an image)
I use COMSOL 4.2a
Does anybody have any idea what might be the problem?