niccoh
Junior Member level 1
I need to simulate a microstrip to microstrip (different substrates) transitions which lie inside a metal cavity.
See (b)
[found at mwrf . com / site-files / mwrf .com /files /archive /mwrf .com /Files /30 /19725 /fig_02 .gif]
The cavity cross-section is about a square.
When I simulate by setting the wave ports to the cavity face at the input and output of the trace I get the warning that multiple modes are propagating at these gamma values... I still converge and get my sweep for an S11/S21 measurement. When I go back and set the number of modes of the wave port to identify and simulate all those modes I get a different result for dominant mode when looking at S11/S21.
How do I know which one I should go with? This structure is fed by a coax a little before which has only 1 mode propagation but I don't want to have to model that aswell as that's more computations.
Thank you
See (b)
[found at mwrf . com / site-files / mwrf .com /files /archive /mwrf .com /Files /30 /19725 /fig_02 .gif]
The cavity cross-section is about a square.
When I simulate by setting the wave ports to the cavity face at the input and output of the trace I get the warning that multiple modes are propagating at these gamma values... I still converge and get my sweep for an S11/S21 measurement. When I go back and set the number of modes of the wave port to identify and simulate all those modes I get a different result for dominant mode when looking at S11/S21.
How do I know which one I should go with? This structure is fed by a coax a little before which has only 1 mode propagation but I don't want to have to model that aswell as that's more computations.
Thank you
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