How to use HFSS Designer dynamic link to simulate LC circuit

Dear All,

I am new to HFSS and designer. I am struggling in using HFSS and Designer dynamic link to simulate a LC resonant circuit. I use HFSS simulating a square microstripe with a gap, which I set up two lumped ports to link the cap in the Designer. However, no the resonant frequency does not change with the various of the capacitance in the designer. Can any body tell how to setup the internal ports in the HFSS to link to the cap in the designer?

Attach is the HFSS design.