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Technical Requirements for the Outdoor Use of 920 MHz Band Beam Wireless Power Transmission Systems
Executive Summary
This document identifies the technical requirements for expanding Beam Wireless Power Transmission (WPT) systems in the 920 MHz band to include outdoor use. It outlines technical conditions for operation on premises as specified low-power radio stations, supporting applications like wireless sensor powering.
Last Updated
02-FEB-26
Technical Requirements for Outdoor 920 MHz Band Beam WPT Systems
This standard identifies the technical requirements for the outdoor application of Beam Wireless Power Transmission (WPT) systems operating in the 920 MHz band. These systems are designed to transmit power wirelessly over distances of 5 to 10 meters, primarily to support sensors and industrial equipment in environments such as factories and warehouses.
Scope and Radio Technologies
- Technology: Beam Wireless Power Transmission (WPT) systems.
- Frequency Band: 920 MHz band.
- Primary Application: Wireless power supply for low-power devices and sensors.
- Operational Environment: Expanded from indoor-only use to include outdoor use on premises and as specified low-power radio stations.
Key Technical Requirements
- Power Output: Currently optimized for low-power delivery in the range of several tens of milliwatts.
- Transmission Range: Effective wireless power transfer over distances of 5 to 10 meters using radio waves.
- Emission Limits: Requirements are being established to ensure outdoor operation is restricted to specific premises or categorized under specified low-power radio station limits to prevent interference.
Compliance and Testing Procedures
The Ministry of Internal Affairs and Communications (MIC) is utilizing a partial report from the Information and Communications Council to develop official regulations for these systems. Compliance will be measured against the following criteria:
- Regulatory Classification: Devices must meet the criteria for "specified low-power radio stations" with limited power output.
- In-Country Requirements: Equipment must comply with Japan's Radio Act and the specific technical ordinances derived from the MIC's ongoing regulatory development.
- Deployment Restrictions: Technical conditions focus on ensuring that outdoor use on premises does not conflict with existing 920 MHz band users.
Regulatory Evolution
This initiative represents an expansion of the "Technical Requirements for Beam Wireless Power Transmission Systems." It modifies the existing framework by introducing technical provisions specifically for outdoor use, providing greater flexibility in installation locations and widening the range of industrial applications. Based on the October 2025 report, the MIC is currently developing the formal regulations that will govern the certification and type approval for these outdoor 920 MHz systems.
Attached Documents & Source Files
Technical Requirements for the Outdoor Use of 920 MHz Band Beam Wireless Power Transmission Systems
Author / Agency: Ministry of Internal Affairs and Communications, JAPAN
Key Regulatory Timeline & Dates
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