interdigital capacitor design
yes, change the MSUB to FR4, and the frequency and the capacitance in the smart component to the desired values ( or the other parameters).
There is some analitically approximation, but they aren't accurate. But, you know the FR4 isn't a good material, so relative permittivity is not so accurate, so simulate with 20% variation if you want to design a cheap, mass product. Don't bother with theoretical formulas, I think they aren't useful for you.