TAISEI CORPORATION and Mitsubishi Electric are jointly developing the T-iPower Beam wireless power supply system, which uses the 5.7 GHz band to supply power to IoT sensors and devices inside buildings. The companies have also disclosed why they selected the 5.7 GHz band, which offers higher power transmission capability than the 920 MHz band and allows antennas to be made smaller.
TAISEI CORPORATION, a major general contractor, is conducting demonstrations and research and development into wireless power transmission through space. In 2022, it jointly developed the T-iPower Beam technology with Mitsubishi Electric, installing power transmission equipment on cleaning and security robots and other devices to supply power to IoT sensors and devices inside buildings. The initiative aims to address the wiring work and operating costs associated with expanding the installation of sensors in buildings.
Wireless power transmission through space, or spatial WPT, is attracting attention as a technology that converts electricity into radio waves and transmits power to equipment located several to more than 10 meters away. The market was worth approximately US$17.37 billion as of 2025 and is forecast to grow to approximately 2.6 times that size by 2034. Distinct from near-field coupling, the technology is expected to be applied to powering IoT equipment and supplying electricity to sensors in factories.
Yamaguchi (山口) explained that the 5.7 GHz band was selected because the 920 MHz band provides less transmission power, while its longer wavelength makes it difficult to reduce antenna size. The 5.7 GHz band, by contrast, can combine compact antennas with high-capacity power transmission. The companies are expected to continue demonstrations of power supply systems as the use of sensors in buildings expands, helping reduce the risk of power outages affecting robots and IoT equipment.