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(a) Analytical model of a focusing plate composed of fifteen unit cells. (b) Focusing plate device implemented via two metallic periodic-ladder structures with a central gap. A snap shot (in time) of the induced current distribution in the device is obtained using comsol multiphysics. (Dimensions: strip width, w = 0.3 mm; gap width, gc = gl = 1 mm; unit cell length, a = w + gc (gl ) = 1.3 mm; device length, L = 15a + w = 19.8 mm; device height, D = 20 mm; device thickness, 0.15 mm; focal distance, d = 1 mm; and conductivity = 5.997 × 107 S/m at 600 kHz).
(Color online) (a) The normalized current (real part) distribution and (b) the curl of the current (real part) distribution at z = 0. The crossed data markers represent the results of the comsol multiphysics simulation. The circled data markers represent the analytical values that are fitted to the numerical results.
(Color online) (a) Magnetic field (real part) distributions at (a) z = 0 and (b) z = 1 mm. The dashed lines are obtained using the analytical model, Fig. 1(a), and the circled markers represent fifteen sampling points at z = 0. The solid lines represent the results of the comsol multiphysics simulation, Fig. 1(b).
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