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answer for both question is yes. is not must be but it will be!! its because since single stub is unilateral. bilateral devices (transistors and etc) will have S11 not equal to S22. but unilateral S11 = S22.
I design single stub to match 50 ohm transmission line to zl=60-80j in HFSS as shown in the following figure but the result show that S11 is matched but S22 isn't.
Just a quick note.
If your scale is in dB, then something is wrong. Because you actually have gain in this passive matching structure...
So maybe check your HFSS setup.
Ok.
I can only tell you that it is a passive structure(circuit) and you can not have S-parameters greater than zero dB.
So there must definetly be something with your simulation setup or drawing in HFSS.
I can only tell you that it is a passive structure(circuit) and you can not have S-parameters greater than zero dB.
So there must definetly be something with your simulation setup or drawing in HFSS.
According to the image, a lumped port is being used -- thats one problem. It's very likely the impedances are not matched. Use waveports and see what values they give you -- I'd suspect they will be different than the ones you have entered.
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