Microwave office Impedance Definition for Substrate

[Hawaslsh]

Hello All,

Sorry for the oddly specific question, hope someone has run into this before. I want to define an 'impedance' material with in an AWR stackup to try and model some super conductors. Looking through the definitions for the way AWR defines the different definitions left me a bit confused.

Below I posted the AWR stack up materials definition and the dialog that opens up when trying to define an impedance material. I also posted the AWR help that explains how the three different components associated with the material are defined. Lastly I posted the list of parameters that can be frequency dependent. This lead to a number of questions I thought you fine folks may be able to help me with.

1. The verbal definition of the low frequency parameter, which i can only assume to be the low frequency resistance in the material definition, says it is used to define the resistance at DC, but this parameter clearly defines the material over a wider range than DC since it is capable of the a frequency defendant parameter?
2. I will gladly admit i'm clutching at straws to understand this part, but i feel the second paragraph is wrong? Do they mean to imply the high frequency parameter is use when the metal thickness is THINNER than the skin dept? Why else would it include the 1/root(Hz) relationship?
3. If i have a known material definition that includes a frequency dependent complex conductivity (which it seems AWR is setup for here). I need to convert to sheet resistance (Ohms/sq) to fill in the low frequency resistance and excess surface reactance. Is the first question 1/(sigma*thickess) what I need?

Thanks in advance!

 

[BradtheRad]

Superconduction occurs at such low temperatures that we're told molecule-scale movement slows down so that it seems stationary (or so we're told). At the same time electrons travel so freely in metal that resistance is effectivelly zero (or so we're told). To my mind this seems paradoxical. I guess different rules apply when we make conditions that create superconductors.

A few terms that might have to do with how your software expects you to fill in those quantities:
* self-resonant frequency
* skin effect
* Q.