1、BRITISH STANDARD BS EN 61580-6:1997 IEC 61580: 1995 Methods of measurement for waveguides Part 6: Return loss on waveguide and waveguide assemblies The European Standard EN 61580-6:1997 has the status of a British Standard ICS 33.120.10BSEN61580-6:1997 This British Standard, having been prepared und
2、er the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comesintoeffect on 15December1997 BSI 04-2000 ISBN 0 580 28426 3 National foreword This British Standard is the English language version of EN 61580-6:1997. Itis identical with IEC 61580
3、:1995, which is shortly to be renumbered as IEC61580-6. The UK participation in its preparation was entrusted by Technical Committee EPL/46, Cables, wires and waveguides, r.f. connectors and accessories for communication and signalling, to Subcommittee EPL/46/2, Connectors and waveguides, which has
4、the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in th
5、e UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over
6、from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC standards normally include an annex which lists normative references to international publications with their corresponding European pu
7、blications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British S
8、tandard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cov
9、er, an inside front cover, pages i and ii, theEN title page, pages 2 to 5 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd.
10、No. Date CommentsBSEN61580-6:1997 BSI 04-2000 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 61580-6 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61580-6 September 1997 ICS 33.120.10 English version Methods of measurement for waveguides Part 6: Return los
11、s on waveguide and waveguide assemblies (IEC 61580-6:1995) Mthodes de mesure appliques aux guidesdondes Partie 6: Pertes de rflexion dans un guidedondes et des assemblages de guidesdondes (CEI 61580-6:1995) Meverfahren fr Hohlleiter Teil6:Rckfludmpfung bei HohlleiternundHohlleiterbauteilen (IEC61580
12、-6:1995) This European Standard was approved by CENELEC on 1997-07-01. 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 bibliog
13、raphical references concerning such national standards may be obtained on application to the Central Secretariat 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
14、of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherland
15、s, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1997 CENELEC A
16、ll rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61580-6:1997 EEN61580-6:1997 BSI 04-2000 2 Foreword The text of the International Standard IEC61580:1995 1) , prepared by SC46B, Waveguides and their accessories, of IEC TC 46, Cables, wires, w
17、aveguides, R.F. connectors, and accessories for communication and signalling, was submitted to the formal vote and was approved by CENELEC as EN61580-6 on 1997-07-01 without any modification. The following dates were fixed: Endorsement notice The text of the International Standard IEC 61580:1995 was
18、 approved by CENELEC as a European Standard without any modification. Contents Page Foreword 2 1 Scope 3 2 Equipment 3 3 Test set-up 3 4 Procedure 4 5 Accuracy 4 6 Requirements 5 Figure 1 Test set-up 3 Figure 2 Flow chart 5 1) Will be renumbered IEC 61580-6. latest date by which the ENhas to be impl
19、emented at national level by publication of an identical national standard or by endorsement (dop) 1998-06-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1998-06-01EN61580-6:1997 BSI 04-2000 3 1 Scope This International Standard is applicable to the
20、 sweep frequency method used for the measurement of return loss on waveguide and waveguide assemblies. Return loss is defined as a r= 20 log (u i /u r )dB where u i is the magnitude of the incident wave; u r is the magnitude of the reflected wave. Return loss is related to the reflection coefficient
21、, r, by: r = (u r /u i ) r = 10 (ar/20) Fundamentally the method involves measuring the amplitude of the reflected wave at the waveguide under test (WUT) input by means of a reflectometer device. The reflected wave can be compared with the total reflected wave under short-circuit conditions, attenua
22、ted by a calibrated attenuator, or it can be compared with the incident wave by means of reflectometer. 2 Equipment A suitable test set-up is shown in Figure 1. Alternative equivalent set-ups can be used by agreement between customer and supplier. a) Sweep generator The sweep rate should be slow eno
23、ugh to allow the strip chart recorder to reproduce the peak values faithfully. b) Isolator An isolator or an attenuator is included to prevent reflected waves affecting the output level of the generator. c) Low-pass filter The low-pass filter or the band-pass filter is included to eliminate spurious
24、 harmonic frequencies. d) Reflectometer device (coupler or bridge) The effective directivity of the reflectometer (with standard adaptor) should be at least 10dB greater than the value to be measured. e) Termination A load with return loss at least 10dB greater than the return loss to be measured. f) Calibrated attenuators Attenuators should be calibrated in the working frequency band. g) Amplitude analyser 3 Test set-up According to the application, a test set-up as in Figure 1 may be used. Figure 1 Test set-up
