On the New Analytical Design of Efficient Inductive Links with Maximum Biomedical Wireless Power Transfer Capability and Area Controllability

This paper presents a new analytical design technique to implement a generic, highly efficient, non-radiative inductive coupling (NRIC) system with maximum biomedical wireless power transfer (BWPT) capability and area control-lability. To achieve this, the configuration of the NRIC link comprises two planar spiral coils and two L-section impedance matching networks (IMN). A comprehensive theoretical analysis is conducted to arrive at a set of completely new and rigorous design equations utilizing the unique power transmission efficiency (PTE) vs frequency behavior for any system of 2-coils. The dependence of PTE on the coil area is also explored. Further, the corresponding S-parameters equations are derived, which determine the optimum PTE. To validate the proposed design concept, a prototype working at 20MHz is simulated, incorporating the human body tissue as the power transfer medium. This EM-simulated prototype laden with the IMNs exhibits excellent agreement with the theoretical aspects. Hence, the proposed design approach is envisaged to be an effective guideline in the realm of NRIC system design that will pave the way to implement the targeted BWPT.