Report ITU-R SM.2505-1 (06/2026) Impact studies for wireless power transmission via radio frequency beam, including human hazard issues
Foreword
Policy on Intellectual Property Right (IPR)
TABLE OF CONTENTS
1 Introduction
2 Radio characteristics of beam WPT
3 Studies on the impact to the incumbent systems
     3.1 Study A (915-921 MHz)
     3.2 Study B (915-921 MHz)
     3.3 Study C (917-920 MHz, 2 410-2 486 MHz, and 5 738-5 766 MHz)
          3.3.1 Frequency bands and incumbent radiocommunication systems and services considered in the study
          3.3.2 Specifications and parameters used for the study
          3.3.3 Building entry loss consideration
          3.3.4 Use case scenarios and conditions for Impact Studies on beam WPT
          3.3.5 Study results
               3.3.5.1 917-920 MHz
               3.3.5.2 2 410-2 486 MHz
               3.3.5.3 5 738-5 766 MHz
     3.4 Study D (2 483.5-2 500 MHz)
          3.4.1 General description
          3.4.2 Parameters used in this study
          3.4.3 Study results
     3.5 Study E (915-921 MHz)
     3.6 Study F (24.1-24.15 GHz)
          3.6.1 United States industrial, scientific and medical regulations
          3.6.2 24 GHz ISM band and radiation limits
          3.6.3 24 GHz ISM beam WPT parameters
          3.6.4 Human hazard issues for 24.1-24.15 GHz WPT
          3.6.5 Protection of co-channel and adjacent allocations
          3.6.6 Protection of adjacent passive bands
          3.6.7 Radio astronomy
          3.6.8 RAS regulation
          3.6.9 RAS discussion
          3.6.10 Earth exploration-satellite service (EESS) passive sensors
          3.6.11 General considerations for EESS
          3.6.12 EESS protection criteria
          3.6.13 EESS (active)
          3.6.14 Terrestrial component of IMT (24.25-27.5 GHz)
          3.6.15 Summary
     3.7 Study G (61-61.5 GHz)
          3.7.1 Radio services considered in the study
          3.7.2 Considerations for 61-61.5 GHz
          3.7.3 Impact 61-61.5 GHz beam WPT
          3.7.4 Human hazard issues for 61-61.5 GHz WPT
     3.8 Study H (915-921 MHz, 2 410-2 486 MHz and 5 738-5 766 MHz)
          3.8.1 Radio services and bands considered in the study
          3.8.2 Details of the calculations
               3.8.2.1 Radiation at WPT frequencies
               3.8.2.2 Radiation at radio astronomy frequencies
               3.8.2.3 Calculations
          3.8.3 Results
          3.8.4 Summary
4 Human hazard issues
5 Summary
Annex 1  Radio frequency exposure environmental control to comply with the Radio Radiation Protection Guidelines – The case of Japan
     A1.1 Beam WPT installation environments
          A1.1.1 WPT controlled environment
          A1.1.2 WPT general environment
     A1.2 Compliance with the RRPG
          A1.2.1 Separation distance
          A1.2.2 Directions
Annex 2  Details of impact studies of beam WPT on EESS (passive), RAS, and IMT in Study F
     A2.1 EESS (passive) and beam WPT
          A2.1.1 Modelling impact of 24 GHz beam WPT devices on EESS (passive) sensors
     A2.2 Summary of results
     A2.3 RAS and beam WPT
     A2.4 Terrestrial component of IMT (24.25-27.5 GHz)
References