BS/EN 60153-4-2017 pdf download.Hollow metallic waveguides Part 4 : Relevant specifications for circular waveguides.
This part of IEC 60153 specifies straight hollow metallic tubing of circular waveguides for use as waveguides in electronic equipment.
The aim of this recommendation is to specify for hollow metallic waveguides:
a) the details necessary to ensure compatibility and, as far as essential, interchangeability;
b) test methods;
c) uniform requirements for the electrical and mechanical properties.
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.
E C 60050-726:1 98, international Electrotechnical Vocabulary. Transmission lines and wave guides
IEC 60261. Sealing test for pressurized waveguide tubing and assemblies 3 Terms and definitions
For the purposes of this document, the terms and definitions given in EC 60050-726:198 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http:!Iwww.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 General
4.1 Standardized types
The series of circular waveguides covered by this publication are shown in Tables 1 and 2. The preferred types are shown in Table 2. As it might be desirable to use circular waveguides of intermediate sizes, Table 3 has been added in which the latter types are included.
4.2 Type designation
For these waveguides, the type designation comprises:
• The code: 60153 IEC-C
• A number characterizing a particular size of waveguide. This number expresses approximately in multiples of 100 MHz the geometric mean frequency in the H11 (TE11) mode.
4.3 Frequency range
In Table 2. the cut-off frequencies are shown for the following modes:
TE11, TM01. TE21, TE01 and TE02.
BS EN 60153-4:2017
— 6 — IEC 60153-4:2017 © IEC 2017
5 Mechanical requirements
5.1 General
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.
5.2 Dimensions
5.2.1 BasIc diameter and deviations
The basic diameters (inner diameters) and the deviations are specified in Table 1.
Where
Dnom = the basic inside diameter
Dmax = the largest measured inside dimension
Dmft = the smallest measured inside dimension
The ellipticity E shall not exceed 0001 at any cross-section for types C 3.3 to C 165 inclusive. For sizes C 190 and smaller dimensions: the requirement for ellipticity is for further study.
5.2.4 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 systems of units.
After conversion from inches into mm. the values were rounded to the nearest 0.005 mm. After conversion from mm into inches, the values were rounded to the nearest 0.001 in.
5.2.5 Eccentricity
The eccentricity is defined as half the difference between the measured thickness of opposite walls. Unless otherwise specified, the eccentricity shall not exceed 10 % of the basic wall thickness. For the determination of the eccentricity, the thicknesses shall be measured where they give the most unfavourable result.
5.2.6 Outside dimensions
The basic values and the deviations are specified in Table 1.
No outside dimensions have been specified for some of the largest sizes because a variety of manufacturing techniques are used.
The values of the outside diameter deviations specified in Table 1 are based on Table 4.
5.3 Other mechanical requirements
5.3.1 Bow
Bow is defined as the maximum departure of the actual axis of the waveguide from a straight line of specified length connecting two points on that axis,
The vow is measured on the external surface of the waveguide. For a length of 10 times the internal width, the external bow shall not exceed 10 times the specified deviation on the internal width.
For a length of 50 times the internal width, the external bow shall not exceed 40 times the specified deviation on the internal width.
For the determination of the external bow, the waveguide shall be so positioned that gravity does not tend to affect the amount of bow.
5.3.2 Surface roughness Under consideration.
5.3.3 Internal stresses
The waveguide tube shall be cut by means of a saw. The cutting process must be carefully controlled so as to avoid distortion arising from the cutting. and the use of a fine high-speed saw is recommended. After cutting, the cross-section of the waveguide tube shall still be within the specified deviations.
6 Electrical tests — Attenuation
The maximum attenuation in the TE11 mode for waveguide IEC — C 104 and waveguides with larger dimensions shall not exceed 1.3 times the value calculated from the formula below at a frequency of 1,2 times the cut-off frequency in the same mode. The values given in the table are for waveguides made of copper with standard conductivity a0 = 5.80 x i07 Siemens / metre.
Circular waveguides (TE11 mode).BS/EN 60153-4-2017 pdf download.