A Resonant System for In Vitro Studies Emulating Wireless Power Transfer Exposure at 13.56 MHz

Area of Science:

• Bioelectromagnetics
• Biomedical Engineering
• Cellular Biology

Background:

• Wireless power transfer (WPT) is crucial for in vitro cell studies.
• Ensuring uniform energy deposition is vital for accurate experimental results.
• Standard incubators impose size constraints on WPT system design.

Purpose of the Study:

• To design a resonant WPT system for emulating in vitro cell exposure.
• To maximize specific absorption rate (SAR) uniformity and efficiency.
• To compare different coil geometries for optimal performance within incubator constraints.

Main Methods:

• Designed and simulated three WPT systems with varying coil geometries (cylindrical circular, cylindrical square, annular).
• Numerically and experimentally characterized system performance (reflection/transmission coefficients, E- and H-fields).
• Computed SAR at the cellular monolayer level within a standard incubator.

Main Results:

• Cylindrical coils with square cross-sections achieved high electromagnetic field uniformity.
• E-field and SAR uniformity at the cell layer were within 7.9% and 5.5%, respectively.
• H-field variation remained below the ±5% limit.

Conclusions:

• The proposed WPT system with square cross-section cylindrical coils is effective for uniform in vitro cell exposure.
• This design offers high SAR efficiency and uniformity crucial for bioelectromagnetic research.
• The system is suitable for integration into standard incubators for cell-based assays.