Figure 1
From: Improving magnetic resonance imaging with smart and thin metasurfaces
On-bench- characterization of the metasurfaces. (a) Simulation of the first two hybrid eigenmodes (normalized H-field component orthogonal to the metasurface in arbitrary units). (b) Measurement of the effective S21 parameter (magnitude) on the central axis as a function of distance and input power at 123.5 MHz with a 3-axis scanning stage; see the supplementary material. (c) Enhancement factor curves for selected input power levels from (b). (d) Symmetric on-bench setup with untuned sniffer coils that leads to the scattering parameters S11 and S21 shown in (e) and (f) as a function of incident excitation power.
