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S21, RF attenuation between two cross-sections
Posted Feb 22, 2016, 5:02 p.m. EST RF & Microwave Engineering Version 5.0 1 Reply
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Hello,
I am trying to simulate a circular wave guide below cut-off to be used as an attenuator. I started with just a cylinder whose boundaries were PECs and each end defined as a port. The S21 followed exponential decay as expected
Now I am exciting the TE11 mode with two parallel wires using a lumped port voltage between them. After simulation I can view the field profile and it is the desired mode. However I would like to know S21 between a short distance after the end of the wires to the end port.
Apparently comsol does not let you define internal boundaries so I am not sure how to do it. I have included a screen shot of my geometry.
Thank you.
I am trying to simulate a circular wave guide below cut-off to be used as an attenuator. I started with just a cylinder whose boundaries were PECs and each end defined as a port. The S21 followed exponential decay as expected
Now I am exciting the TE11 mode with two parallel wires using a lumped port voltage between them. After simulation I can view the field profile and it is the desired mode. However I would like to know S21 between a short distance after the end of the wires to the end port.
Apparently comsol does not let you define internal boundaries so I am not sure how to do it. I have included a screen shot of my geometry.
Thank you.
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1 Reply Last Post Feb 23, 2016, 9:55 a.m. EST
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Posted:
9 years ago
I have tried making a cross-sectional work plane and circle with the same radius as the cylinder, and defining that as a port, and enabling the slit condition. Also i tried defining that as a lumped port with h=0. And I tried calling the the pack plate a port but that failed because of the wires going through it. So no luck with any approach and I cant think what else to do. If anyone has any suggestions for defining ports at arbitrary locations or work arounds to find S21 please reply.