How to add S-parameterof diode to HFSS

[Akbar Ali]

Hi,

I am working on reconfigurable antennas and want to add pin diodes in HFSS-13 using its equivalent circuit model. But I don't know how to do it?
Plz help me if any one know about it.

 

[rodgerwxh]

non-linear devices are power dependent, that means on 1V, it has a circuit model, on 10V, it is going to have a completely different circuit model. Usually, people use small signals on biased non-linear devices so that it can behave approximately linear, but this is not the ideal solution. It is very inconvenient to extract equivalent circuit at every input power and it is not quite accurate.

Back to your question, there should have no S-parameter defined over non-linear networks, S-parameter assumes pure passive linear network. You will have >0 components and out-of-input-freq-range components if you calculate your S-parameter in the traditional way.

 

[PlanarMetamaterials]

there should have no S-parameter defined over non-linear networks, S-parameter assumes pure passive linear network. You will have >0 components and out-of-input-freq-range components if you calculate your S-parameter in the traditional way.

I don't believe this statement is correct. In what definition of S-Parameters does one assume a passive, linear network? The typical definition of S-parameters is, from Pozar (3rd E.) 4.41,

\[{S}_{ij} = {\frac{V_i^-}{V_j^+}}_{(V_k^+ = 0)}\] for k ≠ j

There are no assumptions made regarding the linearity or passivity of the network, therefore they are valid for any of these.

Unfortunately, Akbar Ali, I don't know how to do that in HFSS, but I would assume it is possible to at least model the on and off states.