Set up Modelithics SELECT+ Library™.
mdlxSetup('C:\mdlx_library\SELECT')
Create a new Modelithics library object related to the library you set up.
Search the library for a component that you can mount on the Rogers4350B4mil substrate with the vendor name AVX. This command displays the search results of the components based on your search criteria.
search(mdlx,'Rogers4350B4mil',Vendor='AVX')
Select the Substrate tab to view the the component properties such as substrate, thickness, and many more.

The AVX 600S capacitor on a 4 mil Roger 4350B substrate fits the search criteria. Create a Modelithics component object that mAVXhes these characteristics.
pobj = mdlxPart(mdlx,'600S','Capacitors','AVX','Rogers4350B4mil',Value=1.2e-12);
Create a circuit named C_AVX_600S_Rogers4350B4mil.
hckt = circuit('C_AVX_600S_Rogers4350B4mil');
Add the Modelithics component to the circuit.
Set the ports of the circuit.
setports(hckt, [1 0],[2 0]);
Display the Modelithics component.
Calculate the S-parameters of the circuit.
S = sparameters(hckt,freq);
Plot the S-parameters characteristics.
figure;
rfplot(S)
ylim([-40 0])