IEC TR 63239:2020

IEC TR 63239 ®
Edition 1.0 2020-02
TECHNICAL
REPORT
Radio frequency beam wireless power transfer (WPT) for mobile devices
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IEC TR 63239 ®
Edition 1.0 2020-02
TECHNICAL
REPORT
Radio frequency beam wireless power transfer (WPT) for mobile devices

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.99 ISBN 978-2-8322-7869-7

– 2 – IEC TR 63239:2020 © IEC 2020
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Introduction to RF beam WPT . 5
4.1 Overview of the RF beam WPT type . 5
4.2 Requirements for RF beam WPT . 6
4.2.1 General . 6
4.2.2 Power transfer system design of RF beam WPT . 7
4.2.3 Available candidate frequencies of RF beam WPT . 8
4.2.4 Operating principle of omnidirectional RF beam WPT . 8
4.2.5 Operating principle of directional RF beam WPT . 9
4.3 Operating scenario of RF beam WPT . 11
4.3.1 Possible requirement for RF beam WPT . 11
4.3.2 Operating scenario of omnidirectional RF beam WPT . 12
4.3.3 Operating scenario of directional RF beam WPT . 12
5 Trends in standards, regulations, and technologies related to RF beam WPT . 14
5.1 Trends in standards related to RF beam WPT . 14
5.2 Trends in regulations related to RF beam WPT . 15
5.3 Trends in global products related to RF beam WPT . 19
6 Summary . 22

Figure 1 – TX and RX structures of RF beam WPT . 7
Figure 2 – Beam pattern diagram of omnidirectional RF beam WPT . 8
Figure 3 – Example of high-output omnidirectional RF beam WPT in the space . 9
Figure 4 – Beam pattern diagram of directional RF beam WPT . 9
Figure 5 – Electromagnetic wave transmission/reception at each pattern antenna of
directional RF beam WPT . 10
Figure 6 – Direction RF beam WPT (a) description on delay generation at each pattern
antenna (b) delay adjustment method to transmit desired signals. 10
Figure 7 – Example of beam pattern formation by the delay and direction adjustment
of the transmission signals of each antenna . 11
Figure 8 – Expected operating scenario of omnidirectional RF beam WPT . 12
Figure 9 – Expected operating scenario sequence of directional RF beam WPT – Pilot
signal transmission from the single RX in case of an obstacle . 13
Figure 10 – Expected operating scenario sequence of directional RF beam WPT –
Directional WPT to the single RX in case of an obstacle . 13
Figure 11 – Expected operating scenario sequence of directional RF beam WPT –
Directional WPT from multiple TXs to multiple RXs in case of an obstacle . 14

Table 1 – Overview of the RF beam WPT type . 6
Table 2 – Characteristics of candidate frequencies for RF beam WPT . 8
Table 3 – Activities of domestic/overseas standardization organizations related to RF
beam WPT . 15
Table 4 – Major recommendations and regulations of standardization organizations
related to WPT for mobile devices. 16

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RADIO FREQUENCY BEAM
WIRELESS POWER TRANSFER (WPT) FOR MOBILE DEVICES

FOREWORD
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example "state of the art".
IEC TR 63239, which is a Technical Report, has been prepared by technical area 15: Wireless
power transfer, of IEC technical committee TC 100: Audio, video and multimedia systems and
equipment.
The text of this Technical Report is based on the following documents:
Draft TR Report on voting
100/3212/DTR 100/3317/RVDTR
Full information on the voting for the approval of this Technical Report can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – IEC TR 63239:2020 © IEC 2020
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RADIO FREQUENCY BEAM
WIRELESS POWER TRANSFER (WPT) FOR MOBILE DEVICES

1 Scope
This Technical Report presents the surveyed technologies, product development trends,
international standards, and regulation trends of RF beam WPT. This report can be used for
the research and analysis of projects that apply small-output remote WPT to mobile devices,
such as smartphones, Internet of Things (IoT) devices, and ultra-small sensors.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
IoT
Internet of Things
service-based facilities to provide advanced services by connecting the various things of the
physical world and the virtual world based on information communication technology
Note 1 to entry: Infrastructure computing devices for realizing ubiquitous space are embedded in environments and
things to make them intelligent and to expand the machine-to-machine (M2M) concept, which is capable of intelligent
communication between humans and things or between things to the internet.
Note 2 to entry: The concept has evolved into a concept that interacts with all the information of reality and the
virtual world as well as things. The major technologies of IoT include sensing technology, wired and wireless
communication and network infrastructure technology, IoT interface technology, and service technology through IoT.
3.2
Wi-Fi
Wireless-Fidelity
certification mark provided to products compatible with
...