Optimization of the Coupling Coefficient of the Inductive Link for Wireless Power Transfer to Biomedical Implants

Figure 5

Simulation results for k of WPT with a solenoid Rx coil. The turn number of Rx coil n₂ is swept from 2 to 6, and the wire pitch of Rx coil s is swept from 0.1 mm to 1.1 mm. A single-turn circular Tx coil is used, R₁ = 20 mm and r₁ = 0.287 mm. For the Rx coil, R₂ = 5 mm, and r₂ = 0.04 mm. f_p = 30 MHz and h = 20 mm.