IEC PAS 62431:2005
(Main)Measurement methods for reflectivity of electromagnetic wave absorbers in millimetre wave frequency
Measurement methods for reflectivity of electromagnetic wave absorbers in millimetre wave frequency
specifies the measurement methods for the reflectivity of electromagnetic wave absorbers (EMA) for the normal incident, oblique incident and each polarized wave in the frequency range from 30 GHz to 300 GHz. In addition, these methods are also equally effective for the reflectivity measurement of other materials.
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IEC
AVAILABLE
PAS 62431
SPECIFICATION
First edition
Pre-Standard
2005-07
Measurement methods for reflectivity
of electromagnetic wave absorbers
in millimetre wave frequency
Reference number
IEC/PAS 62431:2005(E)
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PUBLICLY
IEC
AVAILABLE
PAS 62431
SPECIFICATION
First edition
Pre-Standard
2005-07
Measurement methods for reflectivity
of electromagnetic wave absorbers
in millimetre wave frequency
IEC 2005 Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
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– 2 – PAS 62431 © IEC:2005(E)
CONTENTS
1 Scope .5
2 Normative references .5
3 Terms, definitions and acronyms.5
3.1 Terms and definitions .5
3.2 Acronyms .8
4 Specimen .8
4.1 Specimen specification .8
4.2 Reference metal plate.8
4.3 Reference specimen for calibration .9
5 Specimen holder.9
6 Measurement equipment.9
6.1 Network analyser.9
6.2 Antenna .10
6.3 Amplifier.10
7 Measurement condition.10
7.1 Temperature and environment .10
7.2 Calibration temperature of measurement equipment .10
7.3 Warming-up of measurement equipments.10
7.4 Electromagnetic environment .10
7.5 Calibration of measurement equipment .11
7.6 Cable calibration .11
8 Calibration of measurement system and measurement conditions.11
8.1 Calibration of measurement system .11
8.2 Measurement conditions .11
9 Horn-antenna method .11
9.1 Measurement system.11
9.2 Measurement conditions .14
9.3 Measurement procedures .14
10 Dielectric lens antenna method – Focused beam type - .15
10.1 Outline .15
10.2 Measurement system.16
10.3 Measurement procedures .18
11 Dielectric lens method – Parallel beam method .19
11.1 Principle.19
11.2 Measurement system.20
11.3 Specimen .22
11.4 Measurement procedures .23
12 Test report .24
12.1 Content .24
12.2 Specimen .24
12.3 Measurement data.24
12.4 List of test equipment .24
12.5 Unit .24
12.6 Measurement method .24
12.7 Measurement condition.24
PAS 62431 © IEC:2005(E) – 3 –
Annex A (informative) Reflection and scattering from metal plate – Horn antenna
method.25
A.1 Reflection characteristics.25
A.2 Scattering characteristics θ ≒ 0°.26
Annex B (informative) Reflectivity of reference specimens using the horn-antenna
method.27
Annex C (Informative) Specifications of commercially available antennas.28
C.1 Horn antennas.28
C.2 Antennas consisting of dielectric lens.29
Annex D (informative) Calibration using network analyzer.30
D.1 Type of calibration .30
D.2 Calibration procedures.30
Annex E (informative) Dynamic range and measurement errors .32
Annex F (informative) Enlargement of dynamic range – Calibration by isolation.33
Annex G (informative) Example of method of calculation of directional gain of horn
antenna.34
Annex H (informative) Relative permittivity of Styrofoam and foamed polyethylene
based on foam ratio.35
Annex I (informative) Calculation of Fraunhofer region – Horn antenna method .36
Annex J (informative) Electromagnetic field distribution near the focus - .37
Annex K (informative) Time-domain and gating function of network analyser .38
K.1 Time domain.38
K.2 Time resolution and aliasing .38
K.3 Time resolution.38
K.4 Maximum measurable range（aliasing-free range） .39
K.5 Time gating and optimal gate limit.39
Annex L (informative) Specimen holder and antenna positioner .42
Annex M (informative) Example of design of dielectric lens .43
M.1 Design of dielectric lens.43
M.2 Design of antenna .43
– 4 – PAS 62431 © IEC:2005(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MEASUREMENT METHODS FOR REFLECTIVITY
OF ELECTROMAGNETIC WAVE ABSORBERS
IN MILLIMETRE WAVE FREQUENCY
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