GB/T 11322.1-1997 Radio Frequency Cables Part 0: Detailed Specifications Design Guide Part 1 Coaxial Cables

This standard gives recommended values ​​for design parameters such as nominal characteristic impedance and dielectric outer diameter, and provides guidance for the design of coaxial RF cables with braided, metal tape or tubular outer conductors. GB/T 11322.1-1997 RF Cables Part 0: Detailed Specifications Design Guide Part 1 Coaxial Cables GB/T11322.1-1997 Standard Download Decompression Password: www.bzxz.net

GB/T11322.1—1997
This standard is equivalent to IEC96-0-1:1990 "Radio Frequency Cable Part 0: Detailed Specification Design Guide Part 1 Coaxial Cable", and is the first revision of GB11322-89. In IEC 96-0-1, the unit of E2 is kV/mt, and the values ​​listed in Table 3.1 are the values ​​when the unit is kV/cm. Therefore, in this standard, the F2 values ​​of various materials are reduced by 10 times. In IEC96-0-1, the unit of attenuation is dB/m. However, the coefficient in the formula 6.2 is calculated based on the unit of dB/100m. Considering that the attenuation of coaxial radio frequency cables is mostly expressed in dB/100m, a note is added after 6.2 in this standard: \The unit of the value in this article is dB/100m\. This standard is proposed by the Ministry of Electric Power Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of High-frequency Cables and Connectors for Electronic Equipment. This standard was drafted by: Shanghai Transmission Line Research Institute. The main drafters of this standard are: Zhao Tuhua, Jiang Zexing, Gao Wenhao, Wu Zhengping. GB/T 11322.11997
IEC Foreword
1) The IEC (International Electrotechnical Commission)'s final resolutions or agreements on technical issues are formulated by technical committees participated by national committees with special concerns about these issues, and represent the international consensus on the issues involved as much as possible. 2) These resolutions or agreements are used internationally in the form of recommended standards and are recognized by national committees in this sense. 3) In order to promote international unification, IEC hopes that national committees will adopt the text of IEC standards as their national standards if their national conditions permit. The differences between IEC standards and corresponding national standards should be indicated in national standards as much as possible. IEC Foreword
This standard was formulated by the 46A Sub-Technical Committee (Coaxial Cable) of the 46th Technical Committee (Cables, Wires, Conductors, Radio Frequency Connectors and Accessories for Communication and Signaling) of the International Electrotechnical Commission. This standard is the second edition and replaces the first edition of IEC 96-0 (1970). This standard now consists of Part I. The first edition is under consideration and will be published as IEC 96-0-2. The text of this standard is based on the following documents: Six-month method
46A(CO)118
Voting report
46A(CO)131
Details of the voting for approval of this standard can be found in the voting report listed in the table above. The following IE standards are referenced in this standard
IEC68-2: Environmental testing Part 2: Scope of test 1
National standard of the People's Republic of China
Radio frequency cables
Part 0: Guide to the design of detail specifications
Part 1 Coaxial cables
Radin-frequency cables
Part O: Guide to the design of detail specificatlonsSection 1-Coaxlal cables
GB/T 11322.1-1997
ide 1EC 96-0-1:1990
Recommended G11322-89
This standard gives recommended values ​​of design parameters such as nominal characteristic impedance and dielectric outer diameter, and provides guidance for the design of interaxial radiant cables with braided, metal tape or tubular outer conductors. Symbols used
Total attenuation per unit length, 20°C
Total attenuation per unit length, T half 20°C
Attenuation due to component x, 20°C
Weaving angle of component x
Density of material of component x
Loss angle of material of component x
Relative permittivity of material of component x Electrical conductivity of material of component x 20°C
Thermal resistivity of material of component x
Weaving density of component x
Propagation velocity in free space
Capacitance per unit length of component x | |tt||Single wire diameter of component x
Outer diameter of component x
Electrically effective diameter of component x
Average diameter of component x
Maximum voltage gradient (peak) frequency allowed by the dielectric
Thickness of the cover layer of the relevant component x
Calculation coefficient determined according to Tables 2.1 and 2.2
Weaving pitch of the relevant component x
Definition approved by the State Technical Supervision Bureau on October 13, 1997
+中中中
..dB/m
..dB/m
“(degrees)
g/cm?
m/a*mm
...... m/s
199809-01 implementation
Total mass of cable per unit length
Mass of component x
Number of single wires of conductor in the twisted platform
GB/T 11322- ...1997
Number of conductors in each strand of the relevant braiding ×
Number of strands in the braiding of the relevant component+.+..+...
Maximum allowed input power, ambient temperature 40℃ Maximum allowed input power, ambient temperature T≠40℃ Unit
Maximum allowed dissipated power per unit length
Filling factor of the braiding of the relevant component* W/m
Resistance per unit length of conductive component x mInsulation resistance of insulating component x
Nominal thickness of conductive component x
Minimum thickness of component x
Temperature of component x
Ambient temperature
Test voltage (0 Hz), rounded effective value. Test voltage (50 Hz), let the calculated effective value discharge test voltage, effective value
itiarai
maximum allowable working voltage, rounded effective value maximum allowable working voltage, calculated effective value speed ratio
characteristic impedance, nominal value
relevant structural component number:
inner conductor:
1-dielectric,
3-outer conductor;
4-sheath,
intermediate layer between outer conductor and screen layer;
shielding layer +
intermediate layer between the first shielding layer and the second shielding layer; the first shielding layer:
and so on.
Table 2.1 Examples of application of coefficients
Dielectric gradient coefficient determined by inner conductorHeat dissipation coefficient in air on the sheath
.MQ.km
W/tn'E a
Covering factor
Twisting or braiding factorbzxz.net
For attenuation
For DC resistance coefficient
Ratio of total outer diameter to single wire diameter
Effective diameter coefficient of characteristic impedance
3 Material constants
GB/T11322.1-—1997
Table 2.2 Examples of application of coefficients
Related components of the sheath
3.1 Material constants of dielectric and sheath and numerical tables of different materials. Table 3.1
Dielectric band number of dielectric
Dissipation coefficient of dielectric
Maximum allowable dielectric
Voltage gradient
Density of dielectric or sheath
Heat of dielectric or sheath
Maximum allowable working temperature
I) PE = polytetrafluoroethylene,
Solid PE
K·m/w
PTFE-polytetrafluoroethylene;
85/804
FEP-perfluoro(ethylene-propylene) polymer: ETFE = ethylene-tetrafluoroethylene copolymer
PFA-perfluoroethylene;
PVC = polyvinyl chloride
2) Typical.
4) 85°C: high-density material.
80°C; other density materials.
5) Under consideration.
4X10-4
Various materials\values
Foam PE
FEPETFE
EX10-1
2.5×10 1
+.3×10-1
2×10-4
PFA↓PVC
7) Only for the case of silver plating of inner and outer conductors.
3.2 Conductor material constant table
Copper clad steel wire (30 yuan)
Steel clad steel wire (40%)
1) Only applicable to calculation of DC resistance.
Bare feather wire
Silver-plated wire
Tinned copper wire
Copper clad steel wire
GB/T 11322.1-1997
4×10-4
4X10°4
8×101
10×10-
10×101
7X10-4
Electrical conductivity (at 20C) and density
m/n+mm
Table 3.2.2 Cover factor
hie and kx
Pure Table 3.2. 3
See Table 3. 2. 4
1) Covering coefficient: The ratio of the radiation resistance of the coating conductor to the radiation flux of the control line, which depends on the radiation rate and the thickness of the coating. Table 3.2.3 Covering coefficient of tin-plated wire
Table 3.2.4 Covering coefficient of copper-clad steel wire
1) Pseudo-conductive conductivity x-8 m/0 mm, relative magnetic permeability -200. 3-3 Structural constants
3.3.1 Structural constants of inner conductors Table
GB/T 11322.1—1997
Table 3.3. 1
Twisting coefficient of direct resistance and mass
Twisting coefficient of attenuation
Effective diameter coefficient
Ratio of total outer diameter to single wire diameter
Voltage gradient coefficient
Structural constants of braided outer conductor and shielding layer Table 3. 3. 2
Braiding angle
Constituent,
Table 3. 3. 2
= /1+(xD,-/L,)-
=/1+(xD/L=
3.4 ​​Braided single wire size
Braided single wire size table of outer conductor and shielding layer Table 3. 4
Nominal dielectric outer diameter D
0.87 and 1.50
2. 95,3. 70,4. B0 and 6, 40
7. 25,9. 80 and 11. 50
3.5 Attenuation coefficient
Single layer braid
0. 09~0. 11
0.13~0.15
0. 18~0. 20
Values ​​for different numbers of strands (Ni)
Nominal diameter of braided single wire dd
0. 24 ~ 0. 26
Double braid
0. 13~-0. 15
0. 16~0. 18
0.18~~0. 20
Attenuation caused by inner conductor
Attenuation caused by outer conductor
1) Rough approximation (no documented theory yet) 3.6 Maximum allowable input power
GB/T 11322. 1—1997
Table 3.5 Coefficients for calculating attenuation
Structural characteristics
Solid conductor
Composite conductor
Galvanized copper wire
Copper clad steel wire
Tubular outer conductor
Braided outer conductor
Galvanized copper wire braid
Figure 1 Curve for calculation of maximum allowable input power 4 Standard values ​​of characteristic impedance and dielectric outer diameter
4.1 Nominal characteristic impedance of coaxial cable
See Table 3.2.3
See Table 3.2.4
See Table 3.2.3
Cable outer diameter,
All impedances specified in this clause are defined at a frequency of 200 MHz and a reference temperature of 20 ℃. The standard value of the nominal characteristic impedance is: 500.750,930. 4.2 Nominal dielectric outer diameter of the axial cable
Dielectric outer diameter D, nominal value and its tolerance shall comply with the following table Table 4
Nominal value
Tolerance ()
5 Cable structure details
5.1 Overview
First, determine:
a) Nominal characteristic impedance Z. (according to 4.1);
b) Dielectric outer diameter D, (according to 4.2);
GB/T 11322. 1-1997
c) Dielectric constant e of the medium (according to Table 3.1). Calculate the effective point diameter of the outer conductor 1).
Table 5.1 Design characteristics of outer conductor
Outer conductor
Tubular outer conductor
Braided outer conductor
5.2 Inner conductor
The electrical effective diameter D of the inner conductor is determined by the following formula: Die = Deexp(- z. Veg /60)1
Design characteristics of inner conductor
Solid inner conductor
Stranded inner conductor
5.3 Stranded inner conductor
Diameter 1), is determined by the electrical effective diameter D,: The single wire diameter di is determined by D,:
According to 3.3.1,
5.4 Braided outer conductor
Effective diameter
Outer diameter D
Average diameter s
Di - Dle/kit
d, = D,/kia
can be calculated and determined by the outer diameter D, of the dielectric and the diameter d, of the braided wire, Ds = Pz 1: 1. 5dg
D, - - 4. 5d.
4According to Table 3.4
the filling system of the braiding is:
As mentioned above
point cutting 3.3. 2
I = , + 2. 25d,
the braiding density and braiding angle of the outer conductor are determined by the following formula: R,=2—g
β,=arctan(Dm/Lg)
5.5The intermediate layer between the outer conductor and the shielding layer
1)60 is formed by rounding off 59,96.
Diameter Dk
Dae=-D:
b>D,(see 5. 4)
Calculated value of the diameter
Diameter 0>5.3)
5.6 Braided lining
GB/T11322.11997
Medium lining diameter
Ds =3, +25:
Outer diameter P, and average diameter D are determined by the outer diameter D of the middle layer and the braided single wire diameter d.: D.=D: I 4. 5d.
Dhu = PD. T 2. 25d.
d: According to Table 3.4
, the filling factor of the braiding is:
Nenedgke
2 yuan Dm
d, and D as mentioned above
K is determined by the following formula according to Table 3.3. 2
the weaving density and weaving angle of the shield layer: B.——2r— 46
5.7sheath
P, =arctan(kDm/L.)
The outer diameter of the shielding layer Da\
2. 5~5. 9
6. 0~ 9. 0
1) For cables without shielding layer, D. Substitute the outer diameter of the outer conductor [), for mass calculation 5.8
The approximate total mass of the cable is calculated as follows: Nominal diameter
0. D+0. 3
0. 07D,\+-0. 5
The mass of each part is calculated as shown in the following table: Table 5.8
Solid inner conductor
Composite inner conductor
Tubular outer conductor
Braided outer conductor
The middle county between the outer conductor and the shielding layer
Braided screen layer
m;--di - Nkr
-(D- D,)Y
mr(D+,Y
deNnkn
mg=+s)s
me-deNonahY
m=(D—s)
1)For cables without shielding layer, D, use the outer diameter D of the outer conductor instead of the minimum thickness s;min
7. According to Table 3.2.1
21 According to Table 3.3.1
7: According to Table 3.1
According to Table 3.2.1
Point According to Table 3.3.2
Depends on the material used
D, According to Table 5.4
Y, According to Table 3.2.1
Total According to Table 3.3. 2
7, continue with Table 3.1
6 Calculation of electrical properties
GB/T 11322. 1--1997
6.1 DC resistance per unit length of conductor and shield The DC resistance value shall be calculated according to the formula in the following table: Table 6.1
Solid inner conductor
Stranded inner conductor
Tubular outer conductor
Braided outer conductor
Braided screen
6.2 Attenuation
At 1 point,
R,=N,d%
Ntg utx
Ra-Nnoudax
The total attenuation per unit length shall be calculated as follows: α=+a+α
Where; —attenuation component caused by inner conductor; x-—attenuation component caused by dielectric:
:——attenuation component caused by outer conductor.
X1, X,X: According to Table 3.2.1
According to Table 3.3.1
and According to Table 3.3.2
ds and d, according to Table 3.4
This attenuation is the value when the cable temperature is 20°C. When the temperature T is not equal to 20°C, the attenuation should be calculated as follows: ar = (α, + ag) V1 + 0.003 03(T -- 20°C) + az Note: For some dielectric materials, it may be related to temperature. Calculation formulas for α1, α2 and a when the frequency /=10 MHz In the following table, the calculation formula for frequencies below 10 MHz is under consideration. Table 6.2
=Dln(D/D)
ng1 Ve.- tand..f
=D,(DD,'N
Note, in this clause and fi. 4, the unit of a,m-αg,a-ar is dB/100 m, 6.3 Nominal characteristic impedance. And capacitance per unit length CsWe.
# According to Table 3.1
Ds According to Table 5. 1 or 5. 41
D According to 5.2.
6.4 Calculation of rated power
name and gke and according to Tables 3. 2. 1 and 3. 2. 2k and isα according to Table 3. 5
e: and tanb: according to Table 3. 1
D, and D according to 5. 2 and Table 5. 1 Or 6. 1Wen
.10°(pF/m)
The rated power is determined by the attenuation and the maximum power dissipation allowed by the ambient temperature of 40C. The maximum power dissipation allowed per unit length (P.) depends on the maximum temperature T1 allowed by the inner conductor, which is determined by the maximum temperature allowed by the medium (see Table 3.1).
The temperature rise of the inner conductor to the static surrounding air is, 1) 60 feet rounded from 59.96; 3 rounded from 2.9979: T -40℃
8 and. According to Table 3.1
According to Figure 1, select:
GB/T 11322.1
Pejai + Kas
For cables without shielding layer, D, use the outer diameter of the outer conductor I), instead. i1C00P:1*8
! The first term in the above equation is the temperature rise of the inner conductor to the sheath surface (T: -T,). The second term is the temperature rise of the sheath to the surrounding air (\,T,). It is recommended to use the graphical method to solve this equation. After P, is obtained, the maximum allowable input power is calculated as follows: 868.6Pe = 3951g
In the above equation, α is 6. 2
The maximum attenuation may be 10% greater than the nominal value. Since the outer conductor temperature is unknown, the calculation assumes that the outer conductor temperature is the same as the conductor temperature. The error caused by this can be ignored. When the ambient temperature is not equal to 40°C, the rated power can be determined by P using the empirical formula; 6.5 Allowable voltage
6.5.1 Test voltage of dielectric U
P.-Pa (T 40°C!
The maximum electric gradient should be obtained on the surface of the inner conductor. It is limited by the maximum bed gradient E allowed by the dielectric. Therefore, the test voltage U (effective value) is calculated as follows:
E according to Table 3.1:
according to Table 3.3.1!
D, according to 5.31
according to 5.2;
Ds according to Table 5.1 or 5. 4.
Digkan
Then the U. value should be rounded. When the voltage value is less than 5kV, this value should be rounded to the nearest integer multiple of 0.2kV; when the voltage value is 5kV and above, this value should be rounded to the nearest integer multiple of 0.5kV. The rounded test voltage is represented by U. The rounded test voltage should be applied for 2 min, and its frequency is 40 Hz to 60 Hz. 6.5.2 The discharge test voltage of the dielectric l
The discharge test voltage (effective value) is calculated as follows: U - 0.5U.
But for polytetrafluoroethylene dielectric, the minimum value is 0.4U, and the minimum value is 1 kV6. 5. 3 The maximum allowable working voltage U. The maximum allowable working voltage U. (effective value) is calculated from the test voltage: Ue = n.450,
But the input power value shall not exceed the maximum allowable input power P·In all cases, the following conditions must be met: U,≤Vz. . Pa/1 000
Then the Ua value shall be rounded. When the voltage value is lower than 5 kV, this value shall be rounded to the nearest integer multiple of 0.2 kV; when the voltage value is 5 kV and above, this value shall be rounded to the nearest integer multiple of 0.5 kV. The maximum allowable voltage after rounding is expressed as U.1
Pejai + Kas
For cables without shielding layer, D, is replaced by the outer diameter of outer conductor I). i1C00P:1*8
! Yuan,,
The first term in the above equation is the temperature rise of inner conductor to sheath surface (T: -T,). The second term is the sheath temperature rise to surrounding air (\,T,).
It is recommended to solve this equation by graphical method.
After finding P, the maximum allowable input power is calculated by the following formula: 868.6Pe=3951g
In the above formula, α is 6. 2
The maximum attenuation may be 10% larger than the nominal value. Since the outer conductor temperature is unknown, it is assumed that the outer conductor temperature is the same as the conductor temperature when calculating. The error caused by this can be ignored. When the ambient temperature is not equal to 40°C, the rated power can be determined by P using the empirical formula; 6.5 Allowable voltage
6.5.1 Test voltage of dielectric U
P.-Pa (T 40°C!
The maximum electric gradient should be obtained on the surface of the inner conductor. It is limited by the maximum bed gradient E allowed by the dielectric. Therefore, the test voltage U (effective value) is calculated as follows:
E according to Table 3.1:
according to Table 3.3.1!
D, according to 5.31
according to 5.2;
Ds according to Table 5.1 or 5. 4.
Digkan
Then the U. value should be rounded. When the voltage value is less than 5kV, this value should be rounded to the nearest integer multiple of 0.2kV; when the voltage value is 5kV and above, this value should be rounded to the nearest integer multiple of 0.5kV. The rounded test voltage is represented by U. The rounded test voltage should be applied for 2 min, and its frequency is 40 Hz to 60 Hz. 6.5.2 The discharge test voltage of the dielectric l
The discharge test voltage (effective value) is calculated as follows: U - 0.5U.
But for polytetrafluoroethylene dielectric, the minimum value is 0.4U, and the minimum value is 1 kV6. 5. 3 The maximum allowable working voltage U. The maximum allowable working voltage U. (effective value) is calculated from the test voltage: Ue = n.450,
But the input power value shall not exceed the maximum allowable input power P·In all cases, the following conditions must be met: U,≤Vz. . Pa/1 000
Then the Ua value shall be rounded. When the voltage value is lower than 5 kV, this value shall be rounded to the nearest integer multiple of 0.2 kV; when the voltage value is 5 kV and above, this value shall be rounded to the nearest integer multiple of 0.5 kV. The maximum allowable voltage after rounding is expressed as U.1
Pejai + Kas
For cables without shielding layer, D, is replaced by the outer diameter of outer conductor I). i1C00P:1*8
! Yuan,,
The first term in the above equation is the temperature rise of inner conductor to sheath surface (T: -T,). The second term is the sheath temperature rise to surrounding air (\,T,).
It is recommended to solve this equation by graphical method.
After finding P, the maximum allowable input power is calculated by the following formula: 868.6Pe=3951g
In the above formula, α is 6. 2
The maximum attenuation may be 10% larger than the nominal value. Since the outer conductor temperature is unknown, it is assumed that the outer conductor temperature is the same as the conductor temperature when calculating. The error caused by this can be ignored. When the ambient temperature is not equal to 40°C, the rated power can be determined by P using the empirical formula; 6.5 Allowable voltage
6.5.1 Test voltage of dielectric U
P.-Pa (T 40°C!
The maximum electric gradient should be obtained on the surface of the inner conductor. It is limited by the maximum bed gradient E allowed by the dielectric. Therefore, the test voltage U (effective value) is calculated as follows:
E according to Table 3.1:
according to Table 3.3.1!
D, according to 5.31
according to 5.2;
Ds according to Table 5.1 or 5. 4.
Digkan
Then the U. value should be rounded. When the voltage value is less than 5kV, this value should be rounded to the nearest integer multiple of 0.2kV; when the voltage value is 5kV and above, this value should be rounded to the nearest integer multiple of 0.5kV. The rounded test voltage is represented by U. The rounded test voltage should be applied for 2 min, and its frequency is 40 Hz to 60 Hz. 6.5.2 The discharge test voltage of the dielectric l
The discharge test voltage (effective value) is calculated as follows: U - 0.5U.
But for polytetrafluoroethylene dielectric, the minimum value is 0.4U, and the minimum value is 1 kV6. 5. 3 The maximum allowable working voltage U. The maximum allowable working voltage U. (effective value) is calculated from the test voltage: Ue = n.450,
But the input power value shall not exceed the maximum allowable input power P·In all cases, the following conditions must be met: U,≤Vz. . Pa/1 000
Then the Ua value shall be rounded. When the voltage value is lower than 5 kV, this value shall be rounded to the nearest integer multiple of 0.2 kV; when the voltage value is 5 kV and above, this value shall be rounded to the nearest integer multiple of 0.5 kV. The maximum allowable voltage after rounding is expressed as U.
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