Interpolation using an EMmodel in ADS2016 does not seem to work, or I am doing something wrong...
For example, a model (for a piece of line) with Momentum simulations in the EMmodel database at L=100, 150 and 200um, with interpolation turned on (interpolation delta 50um), does not give interpolated simulation results when entering for example L=125um. The interpolation was correct in ADS2015.
In the meantime I tested emModel interpolation with ADS2016 and it all worked well. No issues in my test.
My guess is that your issue is somewhere in scaling the artwork cell. Did you verify that EM results change at all with parameter changes? Please test that, by inserting the parameterized layout into another layout cell, and check that it does change with parameter changes. A possible error source is that ADS sets artwork to "fixed artwork" by default, even if you have defined cellparameters. You need to use File > Customize PCell to set the artwork type to “AEL Macro” or parameterized subcircuit, otherwise it stays fixed, regardless of the cell parameters.
I described the workflow for parametric EM here:
[url]http://muehlhaus.com/support/ads-application-notes/ael-artwork[/url]
Please contact your local Keysight EEsof Technical Support department for assistance.