Supplementary material

In the supplementary material, we include for comparison the experiments with the coaxial cable setup, similar to the ones shown in Fig. 2. We also show how the resonator linewidth and the dispersive shift were extracted. Additionally, we present experiments on clamping flexible stripline samples, including a description of the setup, a theoretical model and a discussion of the measured data. Furthermore, we give details on both the flexible stripline as well as the coaxial cable input chain setups.