Measurement methods of the complex relative permeability and permittivity of noise suppression sheet

IEC TR 63307:2020(E) provides guidelines on the methods for measuring the frequency characteristics of permeability and permittivity in the frequency range of 1 MHz to 6 GHz for a noise suppression sheet for each electromagnetic noise countermeasure.

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Status
Published
Publication Date
26-Nov-2020
Current Stage
PPUB - Publication issued
Completion Date
27-Nov-2020
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IEC TR 63307
Edition 1.0 2020-11
TECHNICAL
REPORT
colour
inside
Measurement methods of the complex relative permeability and permittivity of
noise suppression sheet
IEC TR 63307:2020-11(en)
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---------------------- Page: 2 ----------------------
IEC TR 63307
Edition 1.0 2020-11
TECHNICAL
REPORT
colour
inside
Measurement methods of the complex relative permeability and permittivity of
noise suppression sheet
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.100.10 ISBN 978-2-8322-9085-9

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC TR 63307:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 6

INTRODUCTION ..................................................................................................................... 8

1 Scope .............................................................................................................................. 9

2 Normative references ...................................................................................................... 9

3 Terms, definitions and symbols........................................................................................ 9

3.1 Terms and definitions .............................................................................................. 9

3.2 Symbols .................................................................................................................. 9

4 General ......................................................................................................................... 10

5 Measurement methods .................................................................................................. 11

5.1 Inductance method ............................................................................................... 11

5.1.1 Measurement parameters .............................................................................. 11

5.1.2 Measurement frequency and accuracy ........................................................... 11

5.1.3 Measurement principle................................................................................... 12

5.1.4 Test sample ................................................................................................... 14

5.1.5 Test fixture .................................................................................................... 14

5.1.6 Measurement environment ............................................................................. 14

5.1.7 Measurement uncertainty............................................................................... 14

5.1.8 Measurement system ..................................................................................... 16

5.1.9 Measurement procedure ................................................................................ 16

5.1.10 Example of measurement results ................................................................... 16

5.1.11 Remarks ........................................................................................................ 17

5.2 Nicolson Ross Weir method .................................................................................. 18

5.2.1 Principle ........................................................................................................ 18

5.2.2 Measurement frequency and accuracy ........................................................... 20

5.2.3 Measurement parameters .............................................................................. 20

5.2.4 Test sample ................................................................................................... 20

5.2.5 Measurement environment ............................................................................. 21

5.2.6 Measurement uncertainly ............................................................................... 21

5.2.7 Measurement system ..................................................................................... 22

5.2.8 Test fixture .................................................................................................... 22

5.2.9 Measurement procedure ................................................................................ 22

5.2.10 Example of measurement results ................................................................... 23

5.2.11 Remarks ........................................................................................................ 23

5.3 Short-circuited microstrip line method ................................................................... 24

5.3.1 Principle ........................................................................................................ 24

5.3.2 Measurement frequency and accuracy ........................................................... 25

5.3.3 Measurement parameters .............................................................................. 25

5.3.4 Test sample ................................................................................................... 25

5.3.5 Measurement environment ............................................................................. 26

5.3.6 Measurement system ..................................................................................... 26

5.3.7 Test fixture (MSL jig) ..................................................................................... 26

5.3.8 Measurement procedure ................................................................................ 27

5.3.9 Results (example) .......................................................................................... 27

5.3.10 Remarks ........................................................................................................ 28

5.4 Short-circuited coaxial line method ....................................................................... 28

5.4.1 Principle ........................................................................................................ 28

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IEC TR 63307:2020 © IEC 2020 – 3 –

5.4.2 Measurement frequency and accuracy ........................................................... 29

5.4.3 Measurement parameters .............................................................................. 30

5.4.4 Test sample ................................................................................................... 30

5.4.5 Measurement environments ........................................................................... 30

5.4.6 Measurement system ..................................................................................... 30

5.4.7 Test fixture (coax jig) ..................................................................................... 31

5.4.8 Measurement procedure ................................................................................ 31

5.4.9 Results (example) .......................................................................................... 32

5.4.10 Remarks ........................................................................................................ 33

5.5 Shielded loop coil method ..................................................................................... 33

5.5.1 Measurement principle................................................................................... 33

5.5.2 Measurement frequency and accuracy ........................................................... 38

5.5.3 Measurement parameters .............................................................................. 39

5.5.4 NSS sample dimension and recommendation ................................................ 39

5.5.5 Measurement environment ............................................................................. 40

5.5.6 Measurement system ..................................................................................... 40

5.5.7 Measurement procedure ................................................................................ 40

5.5.8 Measurement results ..................................................................................... 41

5.5.9 Summary ....................................................................................................... 44

5.6 Harmonic resonance cavity perturbation method ................................................... 45

5.6.1 Theory ........................................................................................................... 45

5.6.2 Permeability evaluation .................................................................................. 46

5.6.3 Permittivity evaluation.................................................................................... 53

Annex A (informative) Derivation of the complex relative permeability of the

inductance method ................................................................................................................ 59

Annex B (informative) Short-circuited microstrip line method................................................ 61

B.1 Fundamental calculation ....................................................................................... 61

B.2 Determination of C and G .................................................................................. 62

S S

B.3 Determination of demagnetization factor N and coupling coefficient η ................... 64

B.4 Analysis with the software to determine the μ ....................................................... 64

Annex C (informative) Short-circuited coaxial line method .................................................... 66

C.1 Fundamental calculation to determine μ ............................................................... 66

C.2 Open-circuited coaxial line .................................................................................... 67

C.2.1 Measurement of effective permittivity ε (ε’ – jε” ) .......................................... 67

r r r

C.2.2 Example of the complex permittivity ............................................................... 70

C.3 Remarks on lumped element approximation .......................................................... 71

Bibliography .......................................................................................................................... 73

Figure 1 – In-plane and perpendicular measurement direction of NSS sample ...................... 11

Figure 2 – Toroidal-shaped sample cut from the NSS ........................................................... 12

Figure 3 – Test fixture with a toroidal-shaped NSS sample ................................................... 13

Figure 4 – Equivalent circuit model of the test fixture ............................................................ 13

Figure 5 – Schematic diagram of measurement system ......................................................... 16

Figure 6 – Measurement results of NSS samples .................................................................. 17

Figure 7 – Schematic diagram of a test fixture with a sample and signal flow graph .............. 18

Figure 8 – Cross section of coaxial line with NSS ................................................................. 20

Figure 9 – Dimensions of test sample ................................................................................... 21

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– 4 – IEC TR 63307:2020 © IEC 2020

Figure 10 – Schematic diagram of equipment system for measurement ................................ 22

Figure 11 – Specification for test fixture of a 7 mm coaxial transmission line ........................ 22

Figure 12 – Measurement results of noise suppression sheet ............................................... 23

Figure 13 – Equivalent circuits for the MSL ........................................................................... 25

Figure 14 – Rectangular shape of NSS sample ..................................................................... 26

Figure 15 – Measurement system ......................................................................................... 26

Figure 16 – Short-circuited microstrip line test fixture (MSL jig) ............................................. 27

Figure 17 – Complex relative permeability of a NSS sample C with 0,236 mm

thickness, as measured at N = 0 (and η = 0,135 2) and corrected by demagnetization

factor N = 0,037 (and η = 0,135 2) ........................................................................................ 28

Figure 18 – Equivalent circuits for the coax jig ...................................................................... 29

Figure 19 – Toroidal shape of NSS sample ........................................................................... 30

Figure 20 – Measurement system ......................................................................................... 31

Figure 21 – Short-circuited coaxial line test fixture (coax jig) ................................................. 31

Figure 22 – Complex relative permeability of a NSS sample A with 0,29 mm thickness,

as measured and corrected by the permittivity ...................................................................... 32

Figure 23 – Complex relative permeability of a NSS sample B with 0,25 mm thickness,

as measured and corrected by the effective permittivity ........................................................ 33

Figure 24 – Structure of shielded loop coil ............................................................................ 34

Figure 25 – Shielded loop coil and NSS sample arrangement ............................................... 34

Figure 26 – Whole structure of the measuring unit of the equipment ..................................... 35

Figure 27 – DC magnetization curve ..................................................................................... 38

Figure 28 – Estimation of absolute value correction coefficient M’ ....................................... 38

Figure 29 – Recommended shape of NSS sample ................................................................. 39

Figure 30 – Block diagram of measurement system .............................................................. 40

Figure 31 – Measured complex relative permeability as a function of the size of a NSS

sheet (Sample A-01) ............................................................................................................. 42

Figure 32 – Measured complex relative permeability as a function of the size of a NSS

sheet (Sample B-01) ............................................................................................................. 43

Figure 33 – Measured complex relative permeability of a NSS sheet as a function of

DC bias field intensity (Sample A-02) .................................................................................... 43

Figure 34 – Measured complex relative permeability after absolute value calibration

(Sample A-01) ...................................................................................................................... 44

Figure 35 – Measured complex relative permeability after absolute value calibration

(Sample B-01) ...................................................................................................................... 44

Figure 36 – Electromagnetic flux to evaluate permeability in the harmonic resonance

cavity resonator .................................................................................................................... 47

Figure 37 – Example of the resonance characteristics change .............................................. 47

Figure 38 – Cavity resonator for 3,6 GHz to 7,2 GHz ............................................................ 48

Figure 39 – Cavity resonator for 0,25 GHz to 2 GHz ............................................................. 48

Figure 40 – Examples of resonance frequencies ................................................................... 49

Figure 41 – Example of the resonance curves of a harmonic resonance cavity ..................... 49

Figure 42 – Examples of samples ......................................................................................... 50

Figure 43 – Measuring system .............................................................................................. 50

Figure 44 – Sample installation in the cavity for the permeability measurement .................... 51

Figure 45 – Measured results of the permeability for Sample A and B and a copper rod ....... 53

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IEC TR 63307:2020 © IEC 2020 – 5 –

Figure 46 – Electromagnetic flux to evaluate permittivity in the harmonic resonance

cavity resonator .................................................................................................................... 53

Figure 47 – Sample installation in the cavity for the permittivity measurement ...................... 55

Figure 48 – Adjustment procedure and adjusted results ........................................................ 56

Figure 49 – Measured results of the permittivity for the two samples, A and B ...................... 58

Figure B.1 – Complex relative permeabilities of Sample C with 0,236 mm thickness for

toroidal shape and rectangular shape corrected by N = 0,037 and η = 0,135 2 ...................... 64

Figure B.2 – Complex relative permeabilities of Sample C with 0,236 mm thickness for

rectangular shape corrected by N = 0, 0,018 5 and 0,037 with η = 0,135 2 ............................ 65

Figure B.3 – Complex relative permeabilities of Sample C with 0,236 mm thickness for

rectangular shape corrected by η = 0,225 3, 0,169 and 0,135 2 with N = 0,037 ..................... 65

Figure C.1 – Open-circuited coaxial line jig ........................................................................... 68

Figure C.2 – Equivalent circuits for the open-circuited coaxial line ........................................ 68

Figure C.3 – Complex relative permittivity of NSS Sample A with 0,29 mm thickness,

as measured and corrected by the permeability .................................................................... 71

Figure C.4 – Complex relative permittivity of NSS Sample B with 0,25 mm thickness,

as measured and corrected by the permeability .................................................................... 71

Figure C.5 – Dependence of phase shift βt on frequency ...................................................... 72

Table 1 – Measurement method and frequency ..................................................................... 10

Table 2 – Measurement sample table.................................................................................... 42

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– 6 – IEC TR 63307:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MEASUREMENT METHODS OF THE COMPLEX RELATIVE
PERMEABILITY AND PERMITTIVITY OF NOISE SUPPRESSION SHEET
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

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example "state of the art".

IEC TR 63307, which is a technical report, has been prepared by IEC technical committee 51:

Magnetic components, ferrite and magnetic powder materials.
The text of this Technical Specification is based on the following documents:
Draft TR Report on voting
51/1349/DTR 51/1356/RVDTR

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 Technical Report is English.
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IEC TR 63307:2020 © IEC 2020 – 7 –

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

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– 8 – IEC TR 63307:2020 © IEC 2020
INTRODUCTION

Noise suppression sheet (NSS) is used near the source of high frequency electromagnetic noise,

path of noise propagation and source of emission. It is used like a patch and is different from

an electromagnetic wave absorber in free space. IEC 62333-2 specifies five measurement

methods in order to estimate the effect of NSS. To evaluate the effect by computer simulation,

it is indispensable to know the frequency characteristics of both permeability and permittivity.

And to make a rough estimate of the noise suppression effect of NSS, it is useful to understand

effective permeability and effective permittivity, which are the permeability and permittivity of

an actually used shape.

As most NSSs are flexible, and both complex relative permeability and complex relative

permittivity have anisotropy, careful study and understanding of the principles are indispensable

for the measurement of the frequency characteristics of permeability and permittivity.

There are various methods to measure permeability and permittivity under the frequency range

where NSS is used. This document is intended to be used for the proper selection of the

measurement method and the preparation of the test sample to achieve the above purpose

when measuring permeability and permittivity, the two parameters which largely influence the

noise suppression effect of the NSS.
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IEC TR 63307:2020 © IEC 2020 – 9 –
MEASUREMENT METHODS OF THE COMPLEX RELATIVE
PERMEABILITY AND PERMITTIVITY OF NOISE SUPPRESSION SHEET
1 Scope

This document provides guidelines on the methods for measuring the frequency characteristics

of permeability and permittivity in the frequency range of 1 MHz to 6 GHz for a noise

suppression sheet for each electromagnetic noise countermeasure.
2 Normative references
There are no normative references in this document.
3 Terms, definitions and symbols
3.1 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
3.1.1
noise suppression

suppression which consists of signal decoupling, radiation suppression and attenuation of the

transmission power of noise by an electronic product
Note 1 to entry: Each function above is achieved by absorption and/or shielding.
3.1.2
noise suppression sheet
NSS

sheet which enables noise suppression and is composed of magnetic, dielectric or conductive

material with electromagnetic losses
EXAMPLE Sheet made of soft magnetic metal powder and resin or rubber.
3.1.3
suppression ratio
ratio of the noise level with and without suppression sheets
Note 1 to en
...

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