SIST EN IEC 61726:2022

SLOVENSKI STANDARD
SIST EN IEC 61726:2022
01-november-2022
Nadomešča:
SIST EN 61726:2016
Kabelski sestavi, kabli, konektorji in pasivne mikrovalovne komponente - Meritve
zaslonskega slabljenja z metodo odmevne komore (IEC 61726:2022)
Cable assemblies, cables, connectors and passive microwave components - Screening
attenuation measurement by the reverberation chamber method (IEC 61726:2022)
Konfektionierte Kabel, Kabel, Steckverbinder und passive Mikrowellenbauteile -
Messung der Schirmdämpfung mit dem Strahlungskammerverfahren (IEC 61726:2022)
Câbles, cordons, connecteurs et composants hyperfréquence passifs - Mesure de
l'affaiblissement d'écran par la méthode de la chambre réverbérante (IEC 61726:2022)
Ta slovenski standard je istoveten z: EN IEC 61726:2022
ICS:
33.120.10 Koaksialni kabli. Valovodi Coaxial cables. Waveguides
33.120.30 Radiofrekvenčni konektorji RF connectors
(RF)
SIST EN IEC 61726:2022 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 61726:2022

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SIST EN IEC 61726:2022


EUROPEAN STANDARD EN IEC 61726

NORME EUROPÉENNE

EUROPÄISCHE NORM September 2022
ICS 33.120.01 Supersedes EN 61726:2015
English Version
Cable assemblies, cables, connectors and passive microwave
components - Screening attenuation measurement by the
reverberation chamber method
(IEC 61726:2022)
Cordons, câbles, connecteurs et composants Konfektionierte Kabel, Kabel, Steckverbinder und passive
hyperfréquence passifs - Mesurage de l'affaiblissement Mikrowellenbauteile - Messung der Schirmdämpfung mit
d'écran par la méthode de la chambre réverbérante dem Hallraum-Verfahren
(IEC 61726:2022) (IEC 61726:2022)
This European Standard was approved by CENELEC on 2022-08-22. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 61726:2022 E

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SIST EN IEC 61726:2022
EN IEC 61726:2022 (E)
European foreword
The text of document 46/847/CDV, future edition 4 of IEC 61726, prepared by IEC/TC 46 "Cables,
wires, waveguides, RF connectors, RF and microwave passive components and accessories" was
submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 61726:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-05-22
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-08-22
document have to be withdrawn
This document supersedes EN 61726:2015 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61726:2022 was approved by CENELEC as a European
Standard without any modification.
2

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SIST EN IEC 61726:2022
EN IEC 61726:2022 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 61000-4-21 2011 Electromagnetic compatibility (EMC) - EN 61000-4-21 2011
Part 4-21: Testing and measurement
techniques - Reverberation chamber test
methods
IEC 61196-1 - Coaxial communication cables - Part 1: - -
Generic specification - General, definitions
and requirements
IEC 62153-1 series Metallic communication cables test methods EN 62153-1 series

3

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SIST EN IEC 61726:2022




IEC 61726

®


Edition 4.0 2022-07




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE
colour

inside









Cable assemblies, cables, connectors and passive microwave components –

Screening attenuation measurement by the reverberation chamber method



Cordons, câbles, connecteurs et composants hyperfréquence passifs –

Mesurage de l'affaiblissement d’écran par la méthode de la chambre

réverbérante
















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 33.120.01 ISBN 978-2-8322-3966-7




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Principle of screening attenuation measurement . 7
5 Measurement equipment . 9
5.1 General test instruments . 9
5.1.1 Frequency synthesizer . 9
5.1.2 Spectrum analyser . 9
5.1.3 Reverberation chamber . 9
5.1.4 Mode stirrer . 10
5.1.5 Input antenna . 10
5.1.6 Reference antenna . 10
5.1.7 Stepper motor . 10
5.1.8 Linking devices . 10
5.1.9 Other instruments . 11
5.2 Return loss requirements for linking devices . 11
5.3 Sampling system . 11
5.3.1 General . 11
5.3.2 Normal sampling system . 11
5.3.3 Fast sampling system . 12
6 DUT . 12
6.1 DUT preparation . 12
6.1.1 Cables . 12
6.1.2 Connector . 13
6.1.3 Cable assemblies . 13
6.1.4 Passive microwave components . 13
6.2 Installation of DUT . 13
7 Measurement procedure . 13
8 Caution notes . 14
8.1 Speed of mode stirrer . 14
8.2 Measurement of lossy DUT . 14
8.3 Oscillation and resonance . 14
8.4 Positioning of spectrum analyser . 15
8.5 High power signal test . 15
8.6 High dynamic range test . 15
9 Acceptance criterion . 15
10 Information to be given in the relevant specification . 15
11 Test report . 15
Annex A (informative) Example of a calibrator . 16
A.1 Relationship between transfer impedance and screening attenuation . 16
A.2 Example of a calibrator . 17
Bibliography . 19

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Figure 1 – System configuration example of screening attenuation by reverberation
chamber . 7
Figure 2 – System configuration example of screening attenuation by reverberation

chamber with only one spectrum analyser . 9
Figure A.1 – Basic construction details . 17

Table 1 – Recommended antennas . 10
Table 2 – Number of sampling positions recommended for calibration and test . 12

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

CABLE ASSEMBLIES, CABLES, CONNECTORS AND PASSIVE
MICROWAVE COMPONENTS – SCREENING ATTENUATION
MEASUREMENT BY THE REVERBERATION CHAMBER METHOD

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 61726 has been prepared by IEC technical committee 46: Cables, wires, waveguides, RF
connectors, RF and microwave passive components and accessories. It is an International
Standard.
This fourth edition cancels and replaces the third edition published in 2015. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) reworded Clause 1 "Scope";
b) replaced IEC TS 62153-4-1 by IEC 62153 (all parts) in Clause 2;
c) added the definition of screening attenuation in 3.1;
d) added Clause 4 "Principle of screening attenuation measurement";
e) added the descriptions of some test set-ups, such as frequency synthesizer, spectrum
analyser, stepper motor, linking devices and the sampling system, etc. in Clause 5;
f) added Clause 6 "DUT";

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IEC 61726:2022 © IEC 2022 – 5 –
g) reworded Clause 7 "Measurement procedure";
h) added Clause 8 "Caution notes";
i) added Clause 9 "Acceptance criterion";
j) added Clause 10 "Information to be given in the relevant specification".
The text of this International Standard is based on the following documents:
Draft Report on voting
46/847/CDV 46/877/RVC

Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard 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
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.

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CABLE ASSEMBLIES, CABLES, CONNECTORS AND PASSIVE
MICROWAVE COMPONENTS – SCREENING ATTENUATION
MEASUREMENT BY THE REVERBERATION CHAMBER METHOD



1 Scope
This document describes the measurement of screening attenuation by the reverberation
chamber measurement method, also called mode stirred chamber method.
This document is applicable to screening attenuation measurements of cable assemblies,
cables, connectors, and passive microwave components, such as waveguides, phase shifters,
diplexers/multiplexers, power dividers/combiners, etc.
Modern electronic equipment has shown a demand for methods for testing screening
attenuation performance of microwave components over their whole frequency range.
Convenient measurement methods have existed for lower frequencies and components of
regular shape. These measurement methods are described in the IEC 62153 series. For much
higher frequencies and for components of irregular shape, the reverberation chamber method
can be used. Theoretically, the reverberation chamber method has no upper limit of the
measurement frequency, but it is limited by the quality and sensitivity of the measurement
system, and the lower limit of the measurement frequency is restricted by the size of the
reverberation chamber.
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.
IEC 61000-4-21:2011, Electromagnetic compatibility (EMC) – Part 4-21: Testing and
measurement techniques – Reverberation chamber test methods
IEC 61196-1, Coaxial communication cables – Part 1: Generic specification – General,
definitions and requirements
IEC 62153 (all parts), Metallic communication cable test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61196-1,
IEC 61000-4-21 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

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IEC 61726:2022 © IEC 2022 – 7 –
3.1
screening attenuation
ratio of the electromagnetic field power coupled to the reference antenna to the electromagnetic
field power coupled to the device under test (DUT), expressed by a in Formula (1):
s

P
REF
a = 10 log
 (1)

s 10
P
DUT

where
a is the screening attenuation of DUT, in dB;
s
P is the power coupled to the reference antenna, in W;
REF
P is the power coupled to the DUT, in W.
DUT
4 Principle of screening attenuation measurement
The reverberation chamber is an electrically large screening cavity with high quality factor,
which is equipped with mode stirrer(s), input antenna and reference antenna. A system
configuration example of screening attenuation measurement by reverberation chamber method
is shown in Figure 1.

Figure 1 – System configuration example of screening
attenuation by reverberation chamber
The electromagnetic wave power P emitted by the frequency synthesizer is transmitted to the

INJ
reverberation chamber through the input antenna in the cavity. The electromagnetic wave will
excite the multi-mode electromagnetic field in the reverberation chamber. The boundary
conditions of these electromagnetic fields change with the rotation and stirring of the mode
stirrer, and the electromagnetic field distribution in the cavity is nearly uniform, isotropic and
randomly polarized in the sense of statistical average. When the DUT is placed in the
reverberation chamber, the approximately uniformly distributed electromagnetic power P in
REF
the reverberation chamber received by the reference antenna is equivalent to the external input
power of the DUT, and the electromagnetic power P coupled into the DUT can be obtained

DUT
by the spectrum analyser outside the reverberation chamber.

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According to the definition Formula (1), the screening attenuation of DUT can be calculated
from Formula (2):

P
REF
a = 10 log

s 10
P
DUT

 P  P 
INJ REF
10 log ×

  
10
PP

 DUT INJ

(2)
P  P 
INJ INJ

10 log −10log
  
10 10
PP
DUT  REF
P
INJ

10 log − Δ

10 ins
P
DUT

where
a is the screening attenuation of DUT, in dB;
s
P is the power coupled to the reference antenna, in W;
REF
P is the power coupled to the DUT, in W;
DUT
P is the power injected into the chamber, in W;
INJ
Δ is the insertion loss of the chamber, in decibels (dB).
ins
In Formula (2), the first term represents the total screening attenuation of the system which
can be obtained by measuring the power of DUT connected with a load by spectrum analyser
1. The second term represents the insertion loss of the reverberation chamber which can be
obtained by measuring the power of the reference antenna by spectrum analyser 2.
Measurements of the total screening attenuation and the insertion loss can be carried out
simultaneously.
When only one spectrum analyser is configured, the DUT and reference antenna can be
connected to the spectrum analyser separately by using a switch, and the total screening
attenuation of the system and the insertion loss of the reverberation chamber can be measured
separately (also known as time-division measurement), as shown in Figure 2.
=
=
=

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IEC 61726:2022 © IEC 2022 – 9 –

Figure 2 – System configuration example of screening attenuation
by reverberation chamber with only one spectrum analyser
5 Measurement equipment
5.1 General test instruments
5.1.1 Frequency synthesizer
Frequency synthesizer or other frequency source shall be used, and its output power, frequency
range and transmission bandwidth shall meet the measurement requirements. In order to
ensure the repeatability of measurement, the frequency stability of frequency synthesizer or
−6
other frequency source should be better than 10 .
5.1.2 Spectrum analyser
The frequency range, resolution bandwidth and sensitivity of the spectrum analyser should meet
the measurement requirements. Other equipment that offers the same function, such as EMI
test receiver, can also be used.
5.1.3 Reverberation chamber
The reverberation chamber shall comply with IEC 61000-4-21.
In general, the reverberation chamber is a shielded enclosure having any shape; however, a
perfect cubic shape should be avoided for optimum performance at lower frequencies. It shall
be made of conductive materials (copper, aluminium or steel) and shall not contain lossy
materials.
The upper frequency limit depends on the quality of the shielded enclosure and cables.
Furthermore, the sensitivity of the used measurement instruments also limits the maximum
frequency. There is no upper limit theoretically for the measurement frequency of the
reverberation chamber when its quality is disregarded.
In general, the reverberation chamber is required to work with sufficient modes, and the working
frequency should be greater than the cavity mode frequency as calculated from Formula (3):

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2 22
c
 mn  p
0
(3)
ff>= ++
mnp    
2 l wh
   

where l, w and h are the length, width and height of reverberation chamber respectively, m, n
and p are integers, and the value range is up to the number of modes of reverberation chamber.
It can be drawn from Formula (3) that the lowest usable frequency (LUF) of the reverberation
chamber is limited by the size of the reverberation chamber. The larger the volume is, the lower
LUF is; and the number of modes of the reverberation chamber is directly proportional to the
measurement frequency and the size of the reverberation chamber. Increasing the size of the
reverberation chamber and raising the test frequency can both expand the number of modes of
the reverberation chamber. Therefore, the size of reverberation chamber should be large
enough to meet the requirements for mode frequency and mode number when measuring at
lower frequencies.
For more detailed requirements and instructions for reverberation chambers, reference to
IEC 61000-4-21.
5.1.4 Mode stirrer
The mode stirrer shall be large with respect to wavelength and be at an angle to the walls of
the chamber. The mode stirrer shall be at least two wavelengths at the lowest measurement
frequency from tip to tip. When needed, more than one mode stirrer can be provided.
5.1.5 Input antenna
The input antenna shall be a broadband antenna capable of covering the operating frequency
range, and its transmitting direction shall be towards the corner of the reverberation chamber
or the mode stirrer to avoid direct exposure to the reference antenna. The antenna should
exhibit limited resonances in the frequency range and not introduce losses.
The recommended antennas for different frequency bands are given in Table 1.
Table 1 – Recommended antennas
Frequency range Antenna type
≤1 GHz Dipole antenna
≥1 GHz Horn antenna

5.1.6 Reference antenna
The reference antenna shall be of the same type as the input antenna, and its polarization
direction shall be orthogonal to that of the input antenna.
5.1.7 Stepper motor
The stepper motor should be driven with enough torque to control the angle and speed.
5.1.8 Linking devices
Low loss semi-rigid coaxial cables with good screening attenuation shall be used as the test
cables to connect the spectrum analyser to the DUT. To avoid resonances, the DUT is inserted
into a test cable loop having a length of more than four wavelengths at minimum frequency.
The cable connecting the spectrum analyser to the reference antenna should be consistent with

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the length and quality of the test cable connecting the spectrum analyser to the DUT. It is
required that the test cables, related connectors, adapters, loads, etc. having a screening
attenuation at least 10 dB better than the D
...