Piezoceramic Electrodynamic Wireless Power Receiver Using Torsion Mode Meandering Suspension

Joseph Samman

Authors:  Abdul Halim Miah, Joseph Samman, Spencer Smith, David Arnold

Faculty Mentor:  David Arnold

College:  Herbert Wertheim College of Engineering


This paper reports the design, fabrication and experimental characterization of an electrodynamic wireless power transmission (WPT) receiver that utilizes a meander-shaped suspension and two piezo-ceramic transducers to achieve up to 8.2 mW/cm3 ·mT2 normalized power density (NPD). The system operates at its torsion mode mechanical resonance of 211 Hz. The 2.5 cm3 prototype generates 3.3 mW average power (1.3
mW/cm3 power density) at a distance of 3 cm from a transmitter coil that is operating at the maximum allowable human exposure limit (a maximum 2 mTrms field generated at the center of the coil). Compared to prior works, the proposed design affords the use of multiple piezo transducers within a compact footprint while maintaining a form factor suitable for low-profile system implementation for bio-implantable and wearable applications.

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4 Responses
  1. Jennifer Bridge

    Nice poster! I have two questions:

    Can you explain the meaning of “meandering suspension”?

    What ways could you optimize the structure for better power performance?

    Thank you!

    1. Joseph Samman

      Hey Jennifer,

      All that is meant by meandering suspension is the shape that is cut into the spring steel. It’s called meandering due to its winding, spiral type pattern.

      We can optimize the structure in many ways. Things like the materials used, the thicknesses of said materials, the shape cut into the spring steel, the shape and placement of the magnets, etc.

      Since this project was finished, we’ve already created devices using silicon and titanium, and created new meandered shaped based on our results from this project! Still a work in progress…