Fig. 3: COMSOL simulation of the ME antenna and the Tx coil misalignment. | Nature Communications

Fig. 3: COMSOL simulation of the ME antenna and the Tx coil misalignment.

From: Ultra-compact dual-band smart NEMS magnetoelectric antennas for simultaneous wireless energy harvesting and magnetic field sensing

Fig. 3

a Measured PTE of the ME antenna in the XY plane at a fixed distance of z = 8 mm from the Tx coil. The black figure inside the plot shows the coordinate of the Tx coil in the XY plane; b COMSOL simulation results of magnetic flux (Bx) in the XY plane at z = 8 mm distance from the coil. The simulation results confirm the PTE measurements and show that the longer PCB trace on the right side of Tx coil produces a much larger (> 11×) magnetic flux focal point than the shorter trace on the left; c and d show the magnetic flux densities By and Bz in the XY plane at z = 8 mm distance from the Tx coil, respectively. The magnetic flux By reaches a maximum above the lower copper trace because the current is flowing along the X axis in this direction. The magnetic flux Bz is peaking at the center of the Tx coil because the field loops from copper traces are constructively interfering and giving a field stronger than Bx and By.

Back to article page