I need some guidance regarding the undesired resonances in a waveguide cavity with respect to the position the stubs. I have attached figures to give a background of the problem.
In fig. 1, two stubs were introduced (to create transmission zeros) in the waveguide cavity at the junction near port 1. Two transmission zeros at frequencies equal to 10 GHz and 13.5 GHz were generated with the help of stubs but at the same time two undesired resonances were also generated as shown in the attached results.
In fig. 2, we have changed the position of the stubs. The stubs were introduced in the waveguide cavity at the junction near to port 2. Two transmission zeros were created at the same frequencies but with no undesired resonances.
I want to know the reason why we have undesired resonances in the first case while we don’t have any undesired resonances in the second case. Many thanks.
You have a fairly big mismatch at the step at port 2. Perhaps this is interacting with the stubs when they are at port 1 to give the resonances you see. When they are at port 2, the mismatch at port 1 is a lot smaller, so may not give significant interaction.
Hello,
Undesired resonances occur due to reflection and impedance mismatch. few papers are attached for the help.
Thanks,
Good question and I agree with Dr. Jamil & Dr. Smrity.
Good luck
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