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need debugging attached hfss design

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THUNDERRr

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please
anyone help me debugging this
i simulate 9 conductors surronded by sio2 (insulators) and all in a si substrate
i try to get the z,y paramters they are always zero why?
 

toonafishy

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your wave ports are the same diameter as the copper cylinder (25um), normally you want wave ports larger than the conductor they are illuminating
 

THUNDERRr

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why? could u please modify it and supply the file again?

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i mean if i make the waveport larger than the copper it will intersect with the silicon dioxide surrounding copper is it ok?
 

toonafishy

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i found the problem - you have assigned bulk conductivity to the silicon and silicon dioxide. remove this and the simulation works. i have not been able to use conductivity in a dielectric and wave ports together. in those cases, i use lumped ports and terminal mode solution.

in general, wave ports should be much larger than the conductor they are illuminating. they should cover the conductor and a large portion of the dielectric. otherwise the results will not be accurate. you can see this in the HFSS manual example 6.5.
 

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