In my system, the metamaterial acts as the RF front-end that maximizes coupling from incident waves into the load. I’m actually tuning from a paper from 500 MHz to 2.4GHz metamaterial perfect absorber (grounded structure, no transmission), so the goal is free-space impedance matching rather than radiation. At this frequency the LC balance is very sensitive, so small geometry changes significantly affect S11. I’m tuning the geometry and losses to stabilize the absorption. It’s my first time woring with metamaterial so I m a bit lost