SIST HD 123.7 S1:2002

SLOVENSKI SIST HD 123.7 S1:2002
prva izdaja
STANDARD
september 2002
Hollow metallic waveguides - Part 7: Relevant specifications for square waveguides
ICS 33.120.10 Referenčna številka
SIST HD 123.7 S1:2002(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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NORME
CEI
INTERNATIONALE
IEC
60153-7
INTERNATIONAL
Première édition
STANDARD
First edition
1972-01
Guides d'ondes métalliques creux
Septième partie:
Spécifications particulières pour les guides
d'ondes carrés
Hollow metallic waveguides
Part 7:
Relevant specifications for square waveguides
© IEC 1972 Droits de reproduction réservés — Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun any form or by any means, electronic or mechanical,
procédé, électronique ou mécanique, y compris la photo- including photocopying and microfilm, without permission in
copie et les microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http: //www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
K
PRICE CODE
International Electrotechnical Commission
IEC
MemayHapozwan 3nenrporexHwlecnan HoMHccHA
Pour prix, voir catalogue en vigueur
• • For price, see current catalogue

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3
CONTENTS
Page
5
FOREWORD
PREFACE 5
Clause
9
1. General
1.1 Standardized types 9
9
1.2 Type designation
9
1.3 Frequency range
Mechanical requirements 9
2.
2.1 Dimensions 9
15 2.2 Other mechanical requirements
17
Electrical tests 3.
17
3.1 Attenuation
17
3.2 Irregularity of characteristic impedance

19
4. Additional tests
19
4.1 Gastightness
20
TABLE I

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5
INTERNATIONAL ELECTROTECHNICAL COMMISSION
HOLLOW METALLIC WAVEGUIDES
Part 7: Relevant specifications for square waveguides
FOREWORD
1) The formal decisions or agreements of the I EC on technical matters, prepared by Technical Committees on which all the
National Committees having a special interest therein are represented, express, as nearly as possible, an international
consensus of opinion on the subjects dealt with.
2) They have the form of recommendations for international use and they are accepted by the National Committees in that
sense.
3) In order to promote international unification, the IEC expresses the wish that all National Committees should adopt
the text of the IEC recommendation for their national rules in so far as national conditions will permit. Any divergence
between the IEC recommendations and the corresponding national rules should, as far as possible, be clearly
indicated in the latter.
PREFACE
This recommendation has been prepared by Sub-Committee 46B, Waveguides and their Accessories,
of Technical Committee No. 46, Cables, Wires and Waveguides for Telecommunication Equipment.
It contains Part 7: Relevant Specifications for Square Waveguides, of the complete IEC recommen-
dation for hollow metallic waveguides. Part 1, General Requirements and Measuring Methods, has been
issued as IEC Publication 153-1.
Relevant specifications for other types of waveguides appear in companion publications.
The general outline of this recommendation was first discussed at the meeting held in Baden-Baden
in 1965. Successive revised drafts were prepared and discussed during the meetings held in Tel Aviv in
1966 and in London in 1968. After this latter meeting, a draft was submitted to the National Committees
for approval under the Six Months' Rule, document 46B(Central Office)41, in July 1969.
Although the draft received formal approval it was referred back to SC 46B at its meeting in
The Hague in 1970 where some questionable points were resolved and the decision made to adopt the
Six Months' Rule Document.
During the London meeting in 1968 it was recognized that the Square Waveguide draft did not
include sufficient sizes to adequately cover the frequency spectrum.
Subsequent to the London meeting a draft was circulated which contained additional sizes of Square
Waveguides. This draft was discussed at the meeting in The Hague. Following the meeting in The Hague
a draft on additional sizes of Square Waveguides was submitted to the National Committees for approval
under the Six Months' Rule, document 46B(Central Office)48, in March 1971.
The two approved Six Months' drafts have been combined to form this recommendation.

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— 7 —
The following countries voted explicitly in favour of publication of Part 7:
Australia Norway
Belgium Poland
Portugal
Denmark
France Romania
Germany Sweden
Israel Switzerland
Italy Turkey
United Kingdom
Japan
United States of America
Netherlands
DIMENSIONAL DEVIATIONS
The values for the permissible deviations in this recommendation follow the principles given in
ISO Recommendation R286, ISO System of Limits and Fits, where:
Deviation is defined as:
Algebraical difference between a size (actual, maximum, etc.) and the corresponding basic size.
Upper deviation is defined as:
Algebraical difference between the maximum limits of size and the corresponding basic size.
And lower deviation is defined as:
Algebraical difference between the minimum limit of size and the corresponding basic size.
It should be noted that the upper and lower deviations may have like signs, unlike signs or either
deviation may be zero. This permits the basic sizes of mating shafts and holes to be identical.
The older concept of plus tolerances and minus tolerances has an undesirable limitation, in that the
basic sizes of mating shafts and holes cannot be identical for clearance fits.

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HOLLOW METALLIC WAVEGUIDES
Part 7: Relevant specifications for square waveguides
SQUARE WAVEGUIDES — TYPE Q
Clause No. Item
1.
General
1.1 Standardized types
The series of square waveguides covered by this publication are shown in
Table I.
1.2 Type designation
For these waveguides the type designation comprises:
a) The code: 153 IEC-Q
b) A number characterizing a particular size of waveguide. This number
expresses approximately in multiples of 100 MHz the geometric mean
frequency of the recommended frequency range.
Example: 153 IEC-Q 100
denotes a 19.5 mm x 19.5 mm (0.7677 in. x 0.7677 in.) square
waveguide with a centre frequency of approximately 10 GHz in
the dominant mode.
1.3 Frequency range
The frequency range indicated in Table I is from 1.15 to 1.375 times the
cut-off frequency in the dominant mode. For any particular type of appli-
cation, the working frequency range may be smaller or greater than the
frequency range given in the table.
2. Mechanical requirements
It should be noted that no recommendations are made for the materials to
be used for waveguides. The choice of material must be agreed between
customer and manufacturer.
2.1 Dimensions
2.1.1 Inside dimensions
The deviations both on width and height are + 1/500 of the inside basic width.
The basic values, the deviations and the inside corner radii are specified in
Table I.

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— 11 —
SQUARE WAVEGUIDES — TYPE Q (continued)
Clause No. Item
2.1.2
Wall thickness
The basic values specified in Table I conform to the following rules.
The basic wall thickness is defined as half the difference between the basic
outside and inside dimensions in the original system of units.
After conversion from mm into inches, the values were rounded to the nearest
0.001 in.
Eccentricity
The eccentricity is defined as half the difference between the measured thick-
2.1.3
ness of opposite walls. Unless otherwise specified, the eccentricity shall not
exceed 10% of the basic wall thickness. For the determination of the eccen-
tricity, the thicknesses shall be measured where they give the most unfavour-
able result.
Outside dimensions
The basic values, the deviations and the outside corner radii are specified in
2.1.4
Table I.
The deviations both on width and height conform to the rules given in the
following table:
Range of sizes Deviation 1
1/500 of inside
Q 41 — Q 75
basic width
Q 85 — Q 130 0.05 mm (0.0020 in.)
The outside corner radii (r 2) are within the following limits:
r2 min = 0.5t
0.5 mm (0.02 in.)
r2 max r2 min +
=
where t = basic wall thickness.

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— 13 —
SQUARE WAVEGUIDES — TYPE Q (continued)
Item
Clause No.
2.1.5 Rectangularity of cross-section
The all
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