Figure 3

RF coil geometry and 3D EM field simulations at self-resonance (ca. 48 MHz). (a) Exploded view model of the stacked figure-8 coil. The total height of the pressed PCB stack is approximately 1.1 mm. A \(6~\hbox{mm}\times30~\hbox{mm}\) sized slot is milled into the mid layer spacer (ca. 0.8 mm in height) to accept the fluidic insert featuring the MW resonator. (b) Zoomed-in details of the coil traces. The slot and sample region are indicated by dashed lines. (c) Density plot (top- and cross-sectional view) of the \(B_{\mathrm {y}}\)-field component, showing three distinct high magnetic field regions due to in-phase field superposition. (d) \(B_{\mathrm {y}}\)-field profiles along the y- (\(x=z=0\)) and z-direction (\(x=y=0\)) of the coil, as well as normalised data shown over the sample region (gray rectangles). Figure used with permission⁴¹.