What question did this study set out to answer?

The aim is to develop an omnidirectional wireless power transfer system to enhance energy charging flexibility for multiple IoT devices.

A Single Transmitter and Multiple Receivers Omnidirectional Wireless Power Transfer System for Powering Neighbor IoT Devices

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Randomized trial demonstrates omnidirectional power transfer for IoT devices, suggesting enhanced spatial flexibility in charging systems.

The aim is to develop an omnidirectional wireless power transfer system to enhance energy charging flexibility for multiple IoT devices.
Propose a new flexible printed circuit board coupler to generate a centrally symmetric magnetic field
Manufacture three different shapes of receiving coils (cylinder, square prism, triangular prism)
Conduct practical experiments to validate the omnidirectional operation and performance of the system
Achieved a total output power of 15 W when all coils activated simultaneously
Demonstrated an energy transfer efficiency of 68.18%
Flexible PCB coils allow charging regardless of device rotation or positioning

Gao et al. (2026) studied this question.

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Randomized trial demonstrates omnidirectional power transfer for IoT devices, suggesting enhanced spatial flexibility in charging systems.