This standard applies to ordinary rectangular waveguides. It is part of the complete set of hollow metal waveguide standards and should be used in conjunction with GB 11450.1 "General requirements and measurement methods". This standard is equivalent to IEC 153-2 "Hollow Metal Waveguides Part 2: Specifications for Ordinary Rectangular Waveguides" (Second Edition, 1974) GB 11450.2-1989 Hollow Metal Waveguides Part 2: Specifications for Ordinary Rectangular Waveguides GB11450.2-1989 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Hollow metallic waveguides
Part 2:Relevant specification for ordinary rectangular waveguides
GB11450.2-89
IEC 153-2—1974
This standard applies to ordinary rectangular waveguides. It is part of the complete set of hollow metallic waveguide standards and should be used in conjunction with GB11450.1 "General requirements and measurement methods".
This standard is equivalent to IEC153-2 "Hollow metallic waveguides Part 2: Relevant specifications for ordinary rectangular waveguides" (Second edition, 1974). 1 General
1.1 Standard type
The series of ordinary rectangular waveguides specified in this standard are listed in Table 3. 1.2 Model naming
The model naming of ordinary rectangular waveguides includes: a. Code BJ;
b. A number that characterizes the specifications of a specific waveguide. This number approximately represents the geometric mean frequency of the frequency range of use in multiples of 100MHz.
For example: BJ100 represents a general-purpose ordinary rectangular waveguide of 22.860mm×10.160mm, whose main mode center frequency is about 10GHz.
1.3 Frequency range
The frequency range shown in Table 3 is 1.25 to 1.9 times the main mode cutoff frequency. For special types of applications, the operating frequency range can be smaller or larger than the frequency range shown in Table 3. 2 Mechanical requirements
The material should be selected from Appendix B of GB11450.12.2.1 Dimensions
2.1.1 Internal dimensions
The basic values ​​of internal dimensions and their deviations are specified in Table 3. The deviations of width and height shall comply with the provisions of Table 1. Instructions for adoption: wwW.bzxz.Net
1 This standard reorganizes the unnumbered tables of internal and external deviations in the original IEC153-2 into Tables 1 and 2, so the original Table 1 of IEC153-2 is changed to Table 3. 27 Regarding materials, IEC153 does not make any provisions, but this standard makes recommendations. Approved by the Ministry of Electronics Industry of the People’s Republic of China on March 4, 1989 and implemented on March 1, 1990
Specification range
Waveguides of BJ12 and larger sizes
BJ14~BJ220
BJ260~BJ620
BJ740~BJ900
BJ1200
BJ1400~BJ1800
BJ2200~BJ2600
GB11450.2-89
1/500 of basic inner width
Note: The inner section deviation and inner corner radius values ​​of those small-sized waveguides indicated by 2) in Table 3 are the values ​​necessary to obtain proper electrical matching between the waveguide and waveguide components.
Although it is difficult to manufacture waveguides that meet these tolerances, in practice, slight deviations from these tolerances do not cause serious electrical discontinuity problems, except at the waveguide ends. In order to achieve satisfactory electrical matching, the waveguide bore must be trimmed using a tool after the flange is assembled. When some waveguide sections are to be accurately trimmed for critical component production, it is common practice in industrial production to pass a shaping mandrel through the entire length of some short waveguide sections.
Wall thickness 1
The basic value of wall thickness shall comply with the provisions of Table 3. The basic wall thickness is defined as half of the difference between the outer basic dimension and the inner basic dimension. 2.1.3 Eccentricity
Eccentricity is defined as half of the difference between the measured relative wall thicknesses. Unless otherwise specified, the eccentricity shall not exceed 10% of the basic wall thickness. To determine the eccentricity, the wall thickness shall be measured at the place where the most unfavorable result is produced. 2.1.4 External dimensions
The basic values ​​and their deviations are specified in Table 3. The external dimension deviation values ​​given in Table 3 are in accordance with the provisions of Table 2. Table 2
Specification range
Waveguides of BJ12 and larger sizes
BJ14~BJ22
BJ26~BJ40
BJ58~BJ70
BJ84~BJ900
BJ1200~BJ2600
1/500 of basic inner width
For some large-sized waveguides, the external dimensions are not specified due to the different manufacturing processes used. The external corner radius (r2) should be within the following range: Instructions for use:
1] Regarding wall thickness, this standard only uses legal measurement units, so the content of IEC153-2 on metric and imperial conversion rules is omitted. mm
Where; t—basic wall thickness.
2.1.5 Rectangularity of cross section
GB11450.2-89
2min=0.5t
r2max=r2min+0.5mm
The dimensional requirements of clauses 2.1.1 and 2.1.4 do not control the rectangularity of the cross section. The permissible rectangularity deviation is limited by requiring the shape of the inner (outer) section to meet the following conditions, that is, requiring the actual inner (outer) section to be contained within the range between the specified maximum and minimum inner (outer) rectangles. An example of a suitable method for checking rectangularity is as follows. a. Inspection of inner section
A plug gauge with the following specified dimensions shall pass through the waveguide unimpeded. When pulling the plug gauge through the waveguide, care must be taken to keep the plug gauge exactly perpendicular to the waveguide axis. The dimensions of the plug gauge are as follows:
① The basic dimension of the cross section is the basic diameter of the waveguide minus 1.1 times the diameter deviation; ② The deviation of the cross section dimension is -0, -0.1 times the diameter deviation of the waveguide; ③ The verticality of the side - the deviation is within 3×10-radians; ④ The length is 0.2 times the inner width of the waveguide. b. Inspection of the outer section
The inspection of the outer section is to pass the waveguide through a standard gauge with the following specified rectangular cross-section diameter. The diameter dimensions of the standard gauge are as follows:
① The basic dimension of the cross section is the outer basic dimension of the waveguide plus 1.1 times the deviation; ② The deviation of the cross section dimension is -0, -0.1 times the outer cross-section deviation of the waveguide; ③ The verticality of the side - the deviation does not exceed 3×10-radians. 2.2 Other mechanical requirements
2.2.1 Bend
Bend is defined as the maximum deviation between the actual axis of the waveguide and the straight line connecting two points of a specified length on the axis. The curvature is measured on the outer surface of the waveguide. For a length of 10 times the internal width, the curvature of the outer surface shall not exceed 10 times the deviation specified in the internal width. For a length of 50 times the internal width, the curvature of the outer surface shall not exceed 40 times the deviation specified in the internal width.
To determine the curvature of the outer surface of the waveguide, the waveguide shall be placed so that gravity does not affect the amount of curvature. 2.2.2 Twist
Twist is defined as the rotation of the cross section of the waveguide about the longitudinal axis over a specified length. The rate of twist shall not exceed:
For waveguides with an internal width equal to or greater than 100 mm, the twist shall not exceed 0.5° per meter of length; for waveguides with an internal width less than 100 mm, the twist shall not exceed 0.5° per 10 times the internal width. The cumulative twist shall not exceed 2° over a length equal to 50 times the internal width of the waveguide. The direction of twist shall not be regular in a batch of waveguides.
2.2.3 Surface roughness
The roughness of the inner surface of the waveguide shall comply with the provisions of GB11450.1 "General requirements and measurement methods"1\. 2.2.4 Internal stress
The waveguide shall be cut with a saw. The cutting process must be carefully controlled to avoid deformation due to cutting, and it is recommended to use a fine-toothed high-speed saw. After cutting, the cross-sectional deviation of the waveguide shall still be within the specified range. 3 Electrical test
3.1 Attenuation
GB11450.2-89
The measurement of waveguide attenuation shall be carried out at a frequency 1.5 times the cutoff frequency. The measurement accuracy shall be within ±10% of the required attenuation decibel value.
Unless otherwise specified, for waveguides of BJ100 and larger sizes, the maximum attenuation shall not exceed 1.3 times the calculated value, which shall be calculated using the following formula at a frequency 1.5 times the cutoff frequency. The attenuation values ​​listed in Table 3 are for copper waveguides, and the standard resistivity of copper is P = 1.7241×10-8Q·M. The attenuation should be calculated according to the following formula, but this formula is not applicable to the calculation of attenuation on thin coating surfaces: α = 2.3273
Where: β—resistivity of the non-magnetic metal on the inner wall; P——resistivity of copper (1.7241×10-8α·m); a——internal width,mm;
b--internal height, mm;
f. ——TEso(H,o) mode cutoff frequency (149.°GHz); a
f--frequency to calculate attenuation.
For waveguides smaller than BJ100, the maximum attenuation value is subject to further study. 4 Additional tests
4.1 Airtightness
When necessary, the airtightness requirements shall be agreed upon by the supplier and the buyer. The test method shall be in accordance with the provisions of GB11450.12. Instructions for use:
1] Surface roughness, which is not determined in IEC153-2, is specified in this standard. 2] IEC153-2 does not specify the specific requirements for airtightness, and its test method refers to the IEC261 standard. This standard stipulates that the airtightness requirements shall be agreed upon by the supplier and the buyer, and the test method shall be in accordance with the provisions of GB11450.1. Model
BJ1200
BJ1400
BJ1800
BJ2200
BJ2600
Model\
153IEC-
1) For reference only.
GB11450.2—89
Main mode frequency range
2) See the note of 2.1.2.1 of this standard.
Basic width
Basic height
Width and height
Deviation±
Table 3 Ordinary rectangular
Maximum
Waveguide size
Basic width
Additional notes:
Basic height
GB11450.2-89
Width and height
Deviation±
This standard was drafted by the State-owned Huachang Machinery Factory. Fillet diameter
Minimum value
Maximum value
minus, dB/m
Theoretical value
Maximum value
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