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Impedance boundary condition
Posted Apr 14, 2011, 9:06 a.m. EDT RF & Microwave Engineering Version 3.5a 1 Reply
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HI,
I am modelling a simple semiconductor resistance using the RF module of Comsol 3.5 to study its behavior at frequencies in the tera-hertz regime. I would like to extract the impedance from the S parameters. The geometry i have used is a cuboid having dimension 1mm x 1mm x 2.5mm(x x y x z). I have used the impedance boundary condition at the semiconductor-air interfaces (for the boundaries along the x-z and y-z planes) and specified the port boundary condition for the boundaries along the x-y planes . But i seem to get results which are totally against my thinking.
I am doubtful of what to specify as the source electric field in the impedance boundary condition.... I think that's where i am going wrong.... or is it really something else?
Can someone help me in this regard???
I am modelling a simple semiconductor resistance using the RF module of Comsol 3.5 to study its behavior at frequencies in the tera-hertz regime. I would like to extract the impedance from the S parameters. The geometry i have used is a cuboid having dimension 1mm x 1mm x 2.5mm(x x y x z). I have used the impedance boundary condition at the semiconductor-air interfaces (for the boundaries along the x-z and y-z planes) and specified the port boundary condition for the boundaries along the x-y planes . But i seem to get results which are totally against my thinking.
I am doubtful of what to specify as the source electric field in the impedance boundary condition.... I think that's where i am going wrong.... or is it really something else?
Can someone help me in this regard???
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1 Reply Last Post Apr 15, 2011, 2:02 a.m. EDT
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Posted:
1 decade ago
Hi
are you sure you are respecting the minimum mesh criteria: a few mesh elements (if possible >5) per wavelength IN THE MATERIAL (include the index in your estimation, not the free space wavelength) ?
I believe that is your main issue here
--
Good luck
Ivar
are you sure you are respecting the minimum mesh criteria: a few mesh elements (if possible >5) per wavelength IN THE MATERIAL (include the index in your estimation, not the free space wavelength) ?
I believe that is your main issue here
--
Good luck
Ivar