CISPR PAS 38:2025

CISPR PAS 38 ®
Edition 1.0 2025-04
PUBLICLY AVAILABLE
SPECIFICATION
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Requirements for radio beam wireless power transfer (RB-WPT)
equipment
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CISPR PAS 38 ®
Edition 1.0 2025-04
PUBLICLY AVAILABLE
SPECIFICATION
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE

Industrial, scientific and medical equipment – Radio-frequency disturbance

characteristics – Requirements for radio beam wireless power transfer (RB-WPT)

equipment
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.100.10  ISBN 978-2-8327-0336-6

– 2 – CISPR PAS 38:2025 © IEC 2025
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references. 6
3 Terms and definitions . 7
4 Frequencies designated for ISM use . 8
5 Classification of equipment . 8
6 Limits of electromagnetic disturbances . 8
7 Measurement requirements for RB-WPT . 8
7.1 General . 8
7.1.1 Compliance verification of RB-WPT equipment . 8
7.1.2 General radiated disturbance measurement requirements . 9
7.2 Primary equipment of an RB-WPT system . 10
7.2.1 EUT . 10
7.2.2 WPT power level . 10
7.2.3 EUT arrangement . 11
7.3 Secondary equipment of an RB-WPT system . 14
7.3.1 EUT . 14
7.3.2 WPT power level . 15
7.3.3 EUT arrangement . 15
7.4 RB-WPT system . 16
7.4.1 EUT . 16
7.4.2 WPT power level . 16
7.4.3 EUT arrangement . 16
Bibliography . 18

Figure 1 – EUT arrangement example when using a turntable (3D view) . 12
Figure 2 – EUT arrangement example without a turntable (top view) . 13
Figure 3 – Tilting the EUT and the secondary equipment (side view) . 14
Figure 4 – Repositioning the secondary equipment (top view) . 14
Figure 5 – EUT arrangement example (top view) . 17

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL, SCIENTIFIC AND MEDICAL EQUIPMENT –
RADIO-FREQUENCY DISTURBANCE CHARACTERISTICS –
REQUIREMENTS FOR RADIO BEAM WIRELESS POWER
TRANSFER (RB-WPT) EQUIPMENT
FOREWORD
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CISPR 38 has been prepared by CISPR subcommittee B: Interference relating to industrial,
scientific and medical radio-frequency apparatus, to other (heavy) industrial equipment, to
overhead power lines, to high voltage equipment and to electric traction. It is a Publicly
Available Specification.
The text of this Publicly Available Specification is based on the following documents:
Draft Report on voting
CIS/B/853/DPAS CIS/B/861/RVDPAS

Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
– 4 – CISPR PAS 38:2025 © IEC 2025
The language used for the development of this Publicly Available Specification is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
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specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
NOTE In accordance with ISO/IEC Directives, Part 1, IEC PASs are automatically withdrawn after 4 years.

INTRODUCTION
This document provides an introduction of information related to radio beam wireless power
transfer (RB-WPT) equipment. Originally, RB-WPT should have been treated in CISPR 11.
However, at the CISPR B meeting in San Francisco in Nov 2022, it was decided to go for a PAS
first (see decision 4 in CIS/B/811/DL) which is started in this document.
This document
• specifies a definition of RB-WPT, and
• provides guidance on test set-up and measurement procedures.
With respect to general aspects of measurement equipment, measurement procedures and
applicable disturbance limits, the contents of CISPR 11 apply.

– 6 – CISPR PAS 38:2025 © IEC 2025
INDUSTRIAL, SCIENTIFIC AND MEDICAL EQUIPMENT –
RADIO-FREQUENCY DISTURBANCE CHARACTERISTICS –
REQUIREMENTS FOR RADIO BEAM WIRELESS POWER
TRANSFER (RB-WPT) EQUIPMENT
1 Scope
This document applies to radio beam wireless power transfer (RB-WPT) as industrial, scientific,
and medical equipment operating in the frequency range of 0 Hz to 400 GHz and designed to
operate up to a distance of 10 m.
This document covers emission requirements related to radio-frequency disturbances in the
frequency range of 150 kHz to 18 GHz.
Radio beam wireless power transfer devices are in the scope of this document only if they are
not classified as radio apparatus.
NOTE 1 Wireless power transfer devices that use a modulated signal to transmit both power and information are
classified as radio apparatus in most countries. While radio beam wireless power transfer devices are included in
the scope of this document, these can be classified as radio apparatus in some countries, even if the transmitted
signal is continuous wave, with no modulation. The user is advised to verify the applicable national radio regulations
before applying this document for these types of devices, especially regarding to limits applicable within the ISM
bands wherein this document allows unrestricted radiation.
NOTE 2 Radio beam wireless power transfer devices can generate significant electromagnetic energy. While this
document does not include requirements for radio-frequency (RF) exposure, the user is warned to take appropriate
measures to ensure testing personnel and other bystanders are not subjected to harmful levels of RF exposure from
the product under test.
This PAS adopts the requirements from CISPR 11 and provides important clarifications on the
application of CISPR 11 for RB-WPT.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
CISPR 11:2024, Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
CISPR 16-2-1:2014, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 2-1: Methods of measurement of disturbances and immunity – Conducted
disturbance measurements
CISPR 16-2-1:2014/AMD1:2017
CISPR 16-2-3:2016, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 2-3: Methods of measurement of disturbances and immunity – Radiated
disturbance measurements
CISPR 16-2-3:2016/AMD1:2019
CISPR 16-2-3:2016/AMD2:2023
3 Terms and definitions
For the purposes of this document, the terms and definitions given in CISPR 11 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
artificial secondary equipment
associated equipment of a WPT system consisting of components with defined technical
parameters, which replaces the intended secondary equipment for the purpose of exercising
the primary equipment during measurement
3.2
associated equipment
AE
apparatus that is not part of the system under test, but needed to help exercise the EUT
[SOURCE: CISPR 16-2-3:2016, 3.1.5]
3.3
primary equipment
equipment that is connected to a source of power by a wired connection, and which can transmit
power wirelessly to secondary equipment
Note 1 to entry: The primary equipment can be marketed independently or as part of a WPT system that includes
both primary and secondary equipment units.
3.4
primary transducer
coupling device that transfers energy wirelessly to other device(s)
Note 1 to entry: In case of RB-WPT, the transducer is an antenna or antenna array.
3.5
radio beam wireless power transfer
RB-WPT
WPT operating via electromagnetic waves, where the primary equipment transmits a directional
beam and the secondary equipment is placed within this beam, within a maximum specified
separation distance from the primary equipment, for receiving power wirelessly
Note 1 to entry: RB-WPT generates the RF energy at one location (i.e., at the location of the primary equipment),
but uses this energy at a different location (i.e., at the location of the secondary equipment), with a separation
distance of up to 10 m between the two.
3.6
secondary equipment
equipment that receives energy, either locally or at a different location, from a primary
equipment through WPT
Note 1 to entry: The secondary equipment can be marketed independently or as part of a WPT system that includes
both primary and secondary equipment units.
Note 2 to entry: The energy can be stored, used immediately by a load, or both.

– 8 – CISPR PAS 38:2025 © IEC 2025
3.7
secondary power component
power electronics device(s) and related components of the secondary equipment, including
corresponding interconnecting cables, from the secondary transducer and up to the load (e.g.,
battery) but not including the secondary transducer itself nor the load
3.8
secondary transducer
coupling device that receives energy wirelessly from another device
Note 1 to entry: In case of RB-WPT, the transducer is an antenna or antenna array.
3.9
wireless power transfer
WPT
transfer of electrical energy from a power source to a power recipient (i.e., load) via electric or
magnetic fields or electromagnetic waves for the purpose of powering or charging the electrical
recipient wirelessly
3.10
WPT system
system realising a WPT function and consisting of one primary equipment unit and one or more
corresponding secondary equipment units
4 Frequencies designated for ISM use
For frequencies designated for ISM use, refer to CISPR 11:2024, Table 1.
5 Classification of equipment
For classification of equipment, refer to CISPR 11:2024, 5.2.
6 Limits of electromagnetic disturbances
For limits of electromagnetic disturbances, apply the group 2 limits specified in CISPR 11.
7 Measurement requirements for RB-WPT
7.1 General
7.1.1 Compliance verification of RB-WPT equipment
Contrary to the air-gap WPT technology (such as used in WPT EV systems), the RB-WPT is
usually able to operate over large separation distances between the primary equipment and the
secondary equipment (up to 10 m). Therefore, in the case of RB-WPT, it is usually not possible
to treat the WPT system (consisting of both the primary equipment and the secondary
equipment) as one EUT, in which case these two sub-components shall be measured separately.
Clause 7 specifies three measurement procedures, as follows.
a) Subclause 7.2, for testing the primary equipment. This procedure shall be applied when
1) the EUT consists exclusively of the primary equipment (such as when the secondary
equipment is manufactured by third parties), or
2) the EUT consists of both the primary and secondary equipment, but these cannot
operate with a separation distance of 100 cm or less between them, or such an
arrangement does not result in the highest emission relative to the applicable limit (see
7.4.1).
b) Subclause 7.3, for testing the secondary equipment. This procedure shall be applied when
1) the EUT consists exclusively of the secondary equipment (such as when the primary
equipment is manufactured by third parties), or
2) the EUT consists of both the primary and secondary equipment, but these cannot
operate with a separation distance of 100 cm or less between them, or such an
arrangement does not result in the highest emission relative to the applicable limit (see
7.4.1).
c) Subclause 7.4, for testing the entire system, consisting of both the primary and the
secondary equipment. This procedure shall be applied when the EUT consists of both the
primary and secondary equipment and either one of the following two conditions applies:
1) the maximum separation distance between the primary and the secondary equipment,
as specified in the instructions of use of the equipment, is 100 cm or smaller; or
2) the EUT is capable of operating over separation distances greater than 100 cm (between
the primary and the secondary equipment) but it is allowed to be tested with a separation
...