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Asif Iftekhar Omi, Anyu Jiang, Baibhab Chatterjee

IEEE Transactions on Biomedical Circuits and Systems

|March 3, 2025

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This study optimizes wireless power transfer for implantable bioelectronics by co-designing inductive links and matching networks. It achieves high power transfer efficiency (PTE) within implantable area constraints, offering guidelines for future biomedical applications.

Area of Science:

Biomedical Engineering
Implantable Bioelectronics
Wireless Power Transfer

Background:

Optimizing power transfer efficiency (PTE) for implantable bioelectronics is challenging due to spatial constraints.
Existing inductive link designs require further development for enhanced performance in biological tissues.

Purpose of the Study:

To systematically develop and optimize inductive links for maximizing biomedical wireless power transfer (BWPT).
To address the specific challenges of PTE optimization within the spatial/area constraints of bio-implants embedded in tissue.

Main Methods:

Derivation of optimal self-inductance using S-parameter analyses.
Co-design of planar spiral coils and L-section impedance matching networks.
Fabrication and testing of symmetric (type-1) and asymmetric (type-2) coil prototypes in pork tissue.

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Main Results:

Type-1 coil achieved 4% PTE (15 mm channel length) and 20 dB return loss (RL) within 1818 mm² area.
Type-2 coil achieved 2% PTE and 15 dB RL with a 55 mm² receiving coil area.
A 65 nm test chip with an integrated energy harvester produced a stable 1V DC output.

Conclusions:

The proposed design methodology enhances PTE for implantable bioelectronics.
Demonstrated state-of-the-art performance for inductive links in biomedical applications.
Provided comprehensive guidelines and resources for advancing BWPT systems.