GB/T 26667-2021 English PDFUS$369.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 26667-2021: Terminology for electromagnetic shielding materials Status: Valid GB/T 26667: Historical versions
Basic dataStandard ID: GB/T 26667-2021 (GB/T26667-2021)Description (Translated English): Terminology for electromagnetic shielding materials Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: K04 Word Count Estimation: 20,267 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 26667-2021: Terminology for electromagnetic shielding materials---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.(Terminology for electromagnetic shielding materials) ICS 17.220.99 CCSK04 National Standards of People's Republic of China Replace GB/T 26667-2011 Terminology for electromagnetic shielding materials Released on 2021-04-30 2021-11-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee Table of contentsForeword Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 3.1 Electromagnetic field 1 3.2 Electromagnetic shielding materials 4 Appendix A (informative) Auxiliary terms of electromagnetic shielding materials 8 A.1 Basic Radio Terminology 8 A.2 Auxiliary terms for electromagnetic shielding materials 10 A.3 Main measuring equipment for electromagnetic shielding materials 11 Reference 13 Index 14 Terminology for electromagnetic shielding materials1 ScopeThis document defines the terms and definitions of materials with electromagnetic shielding effect in the frequency range of 0Hz~500GHz. This document is applicable to electromagnetic shielding in the field of electromagnetic shielding materials and related equipment, human body and environment. Note. For ease of use, Appendix A gives auxiliary terms for electromagnetic shielding materials.2 Normative referencesThere are no normative references in this document.3 Terms and definitions3.1 Electromagnetic field 3.1.1 Electromagnetic(EM)wave The radiant energy produced by the oscillation of the electric charge is characterized by the oscillation of the electromagnetic field. [Source. GB/T 17626.3-2016, 3.6] 3.1.2 Electromagnetic radiation A phenomenon in which energy is emitted from a source to space in the form of electromagnetic waves, or a state in which energy is propagated in space in the form of electromagnetic waves. Note. The meaning of the term "electromagnetic radiation" can sometimes be extended to include the phenomenon of electromagnetic induction. [Source. GB/T 4365-2003, 161-01-10, with modification] 3.1.3 Electric field strength The ratio of the force F acting on a static charged particle to the particle charge Q. E=F/Q Where. E --- Electric field strength, in volts per meter (V/m); F --- the force acting on a static charged particle, the unit is Newton (N); Q --- The charge of a charged particle, the unit is coulomb (C). [Source. GB/T 2900.60-2002, 121.11.18, with modification] 3.1.4 Magnetic fieldstrength The magnitude of the force of the magnetic field on the electric charges moving in the field. Note. The magnetic field strength is a basic quantity that characterizes the characteristics of the magnetic field, it is a vector, and the unit is ampere per meter (A/m). [Source. JJF1188-2008, 12.2, with modification] 3.1.5 Powerfluxdensity The energy passing along the normal direction of the unit area per unit time. Note. The power flux density is a scalar, which is the time average of Boynting's vector mode, in watts per square meter (W/m2). [Source. JJF1188-2008, 12.4, with modification] 3.1.6 Electromagnetic shielding Use conductive, magnetic, or conductive and magnetic materials to reduce or block the propagation of the electromagnetic field to the designated area. 3.1.7 Shieldingeffectiveness SE At a certain point under the same excitation, the ratio of the electric field strength, magnetic field strength or power measured with shielding material and without shielding material. SE=20lg(E2/E1) Or SE=20lg(H2/H1) Or SE=10lg(P2/P1) Where. SE ---shielding effectiveness, in decibels (dB); H1---Magnetic field strength without shielding material, in ampere per meter (A/m); H2---Magnetic field strength with shielding material, the unit is ampere per meter (A/m); E1 --- Electric field strength without shielding material, in volts per meter (V/m); E2 --- the electric field strength when there is shielding material, the unit is volts per meter (V/m); P1 --- the power when there is no shielding material, in watts (W); P2 --- The power when there is shielding material, the unit is watts (W). Note. The shielding effectiveness is usually a negative value, but it is customary to use its absolute value. 3.1.8 Surface resistivity The ratio of the direct current electric field intensity on the surface layer of the material to the linear current density is the surface resistance per unit area. Note. The unit of surface resistivity is expressed in ohms (Ω). 3.1.9 Volume resistivity The ratio of the intensity of the DC electric field in the material body to the steady-state current density is the volume resistance per unit volume. Note. The unit of volume resistivity is expressed in ohm meters (Ω·m). 3.1.10 Electromagnetic thermal effect After the electromagnetic energy entering the organism is converted into heat energy, it can increase the local or overall temperature, resulting in changes in its tissue structure or physiological or physical changes. Biological effects of changes in biochemical indicators. 3.1.11 Bio-electromagneticathermaleffect After organisms absorb electromagnetic energy, the biological effects produced are not attributable to temperature changes. 3.1.12 Nearfield < Measurement> A field that satisfies r>2D2/λ electromagnetic field division conditions. Where. r --- field source distance, in meters (m); D --- the effective aperture of the transmitting antenna, in meters (m); λ ---The wavelength of electromagnetic waves, in meters (m). Note 1.In the near field, the reactance of the electrically small antenna satisfies D/λ< 1. Note 2.The near field is dominated by the induction field. [Source. JJF1188-2008, 12.5, with modification] 3.1.13 Farfield < Measurement> A field that satisfies r>2D2/λ electromagnetic field division conditions. Where. r --- field source distance, in meters (m); D --- the effective aperture of the transmitting antenna, in meters (m); λ ---The wavelength of electromagnetic waves, in meters (m). Note 1.In the far field, for an electrically large antenna, r takes the maximum of 10D and 2D2/λ; the radiation of an electrically small antenna satisfies r >λ/2π. Note 2.The far field is dominated by the radiation field. [Source. JJF1188-2008, 12.6, with modification] 3.1.14 Reflection attenuation Ra The ratio of reflected power to incident power after electromagnetic waves are irradiated on the surface of the material. Ra=10lg Pr Pi Where. Ra-reflection attenuation, in decibels (dB); Pr---Reflected power, in watts (W); Pi-Incident power, in watts (W). [Source. GB/T 32596-2016, 3.2, with modification] 3.1.15 Transmissionattenuation Ta After the electromagnetic wave irradiates the surface of the material, the ratio of transmitted power to incident power. Ta=10lg Pt Pi Where. Ta---transmission attenuation, in decibels (dB); Pt---transmitted power, in watts (W); Pi --- incident power, in watts (W). [Source. GB/T 32596-2016, 3.3, with modification]. 3.1.16 Power loss PL The ratio of the power absorbed by the material to the incident power after the electromagnetic wave is irradiated on the surface of the material. PL= Pi-Pt-Pr Pi Where. PL --- power loss, in watts (W); Pi --- incident power, in watts (W); Pt ---transmitted power, in watts (W); Pr ---Reflected power, in watts (W). [Source. GB/T 32596-2016, 3.4, with modification] 3.2 Electromagnetic shielding materials 3.2.1 Electro-conductive fiber A general term for fibers made of conductive materials all or on the surface. 3.2.2 Metalfiber Fiber made of metal. Note. Such as stainless steel fiber, nickel fiber, iron fiber, copper fiber and silver fiber. 3.2.3 Metalized fiber Using physical or chemical methods, a conductive fiber with a metal layer is formed on the surface of the fiber. Note. Such as silver-plated fiber, copper-plated fiber, nickel-plated fiber, etc. 3.2.4 Carbonfiber Inorganic fiber composed of carbon element. Note. Carbon fiber can generally be divided into ordinary carbon fiber, high-strength carbon fiber, high-modulus carbon fiber, etc. according to product performance. 3.2.5 Modified electro-conductive fiber The fiber is modified by blending, chemical grafting, chelating (such as ionic conductive fiber) and other methods to make it a conductive fiber. 3.2.6 Electro-conductive yarn It is made of conductive fiber purely spun or blended with other fibers, and it is conductive directly on the surface of the yarn after conductive treatment Capable yarn. 3.2.7 Electromagnetic shielding fabric Fabrics made of conductive and magnetically conductive functional fibers and yarns, or the fabrics are treated with surface metallization, coating, etc., to make them have Electromagnetic shielding effect Note. Metallization treatment includes vacuum coating method, electroless plating, electroplating, etc. 3.2.8 Metalized electro-conductive fabric Using various fiber fabrics as the base material, after surface treatment, the metal layer is deposited by physical or chemical methods to make it conductive, electromagnetic Soft conductive material with shielding function. [Source. GB/T 30139-2013, 3.1.1] 3.2.9 Electro-conductive yarnnet Using various polymer material mesh fabrics as the base material, after surface treatment, the metal layer is deposited by physical or chemical methods to make it conductive. Soft conductive material with electrical and electromagnetic shielding function. [Source. GB/T 30139-2013, 3.1.2] 3.2.10 Electro-conductivenon-woven fabric Using various non-woven fabrics as the base material, after surface treatment, the metal layer is deposited by physical or chemical methods to make it conductive and electromagnetic screen Soft conductive material with shielding function. [Source. GB/T 30139-2013, 3.1.3] 3.2.11 Electro-conductive fiber fabric A fabric with electromagnetic shielding function made by blending or interweaving conductive fibers or yarns with other fibers or yarns. [Source. GB/T 30139-2013, 3.2] 3.2.12 Stainless steel fiber fabric An electromagnetic shielding fabric containing stainless steel fibers. [Source. GB/T 30139-2013, 3.2.1, with modification] 3.2.13 Metalized fiber fabric A fabric with electromagnetic shielding function containing metalized fibers (blend or pure spinning). Note. Such as silver-plated fiber fabric, copper-plated fiber fabric, nickel-plated fiber fabric, etc. 3.2.14 Metalion-cyanchelated fiber fabric One or more metal cations are applied to the cyano group of the fiber through chelation to make it a fabric with electromagnetic shielding function. [Source. GB/T 30139-2013, 3.2.3] 3.2.15 Electromagnetic shielding metal wire mesh A mesh structure material made of metal with electromagnetic shielding function. Note. Including mesh structure materials made by weaving, metallization, coating, etching and other methods. 3.2.16 Electro-conductivemetalwiremesh Use various metal wire meshes as the substrate, and deposit other metal layers by physical or chemical methods on its own or after surface treatment, which has conductive Soft conductive material with electrical, electromagnetic shielding, oxidation resistance and other properties. [Source. GB/T 30139-2013, 3.1.4] 3.2.17 Electromagnetic shielding coating It can be coated on the base material and has an electromagnetic shielding function. 3.2.18 Electromagnetic shielding tape Adhesive and fixing tape for electromagnetic shielding purposes. 3.2.19 Electro-conductiveadhesive Conductive adhesive Conductive adhesive Adhesive with certain conductivity and bonding effect for the purpose of conductive connection. 3.2.20 Electro-conductive gasket A type of electromagnetic shielding material used at the joint and the joint surface to ensure effective conductive contact. 3.2.21 Finger Reed fingerstock Flexible shielding material made of sheet metal. 3.2.22 Electro-conductive foam The sponge with conductive function or the elastic body with electromagnetic shielding function formed by wrapping conductive material on the outer layer of the sponge. 3.2.23 Electromagnetic shielding hasp/zipper Metalizing Velcro/Nylon zippers or resin zippers to make them conductive and used for electromagnetic shielding that requires frequent opening and closing The connection of the gap. 3.2.24 Electromagnetic shielding rubber An electromagnetic shielding material that adds conductive or magnetic materials to the rubber matrix and maintains the characteristics of rubber. 3.2.25 Electromagneticshieldingplastic The plastic resin and the conductive or magnetic material are mixed to make a polymer material with electromagnetic shielding function. 3.2.26 Electromagnetic shielding plate A plate-shaped electromagnetic shielding material used to build an electromagnetic shielding shell and shield the electromagnetic field inside and outside the shell. 3.2.27 Transparent electromagnetic shielding material It is a transparent material with electromagnetic shielding function for observation windows and display windows of electronic equipment. 3.2.28 Electromagnetic shielding glass Light-transmitting device with electromagnetic shielding function based on glass. 3.2.29 Electromagnetic shielding film It is a non-optical film with conductivity and electromagnetic shielding effect after metallization treatment with polymer film as the main substrate. 3.2.30 Waveguideventilatingboards A ventilation plate that uses the cut-off characteristics of the waveguide to achieve electromagnetic shielding function. 3.2.31 Waveguidevent The waveguide and the ventilation window are combined into a whole to form a device that not only allows air circulation, but also realizes electromagnetic shielding. [Source. GB 50174-2017, 2.1.18, with modification] 3.2.32 Intrinsicconductingpolymer Polymers with conjugated π bonds are chemically or electrochemically "doped" to convert them from an insulator to a conductive polymer material. 3.2.33 Eletro-conductive nanomaterial At least one dimension of the material structure in the three-dimensional space is at the nanometer scale, or is composed of nanostructure units and has special properties. Electric materials. 3.2.34 Electromagnetic wave absorbing material Absorbing material A material that can absorb electromagnetic energy. 3.2.35 Electromagnetic shielding shrinkable tube With electromagnetic shielding function, under heating conditions, the shielding layer and the substrate shrink simultaneously in the radial direction, including the tubular composite of the shielding layer and the substrate material. 3.2.36 Magneticshieldingplate A plate-shaped magnetic shielding material used to build a magnetic shielding shell and shield the magnetic field inside and outside the shell. 3.2.37 Electromagnetic shielding foil A sheet with electromagnetic shielding function that is stretched out of metal.Appendix A(Informative) Auxiliary terms for electromagnetic shielding materials A.1 Basic radio terms A.1.1 Frequency The rate of repetition time or the number of repetitions of the event in 1s. Note. The unit of frequency is hertz (tz), and the symbol is Hz. The frequency of electrical signals is usually measured in multiples of hertz (tz), such as kilohertz (1kHz=103Hz), megahertz (1MHz=106Hz), gigahertz (1GHz=109Hz). [Source. JJF1180-2007, 3.1, with modification] A.1.2 Transverse electromagnetic wave TEM wave An electromagnetic wave in which the electric field component and the magnetic field component are perpendicular to each other, and both are perpendicular to the direction of propagation. [Source. JJF1188-2008, 1.12] A.1.3 Plane electromagnetic wave Plane wave The wave front is a plane electromagnetic wave. [Source. JJF1188-2008, 1.13] A.1.4 Incidentpower The power of the signal source incident on any load. [Source. JJF1188-2008, 5.5] A.1.5 Reflectedpower The power reflected by the load. [Source. JJF1188-2008,5.6] A.1.6 Attenuation When a two-port network is inserted into a non-reflective system composed of a signal source and a load, the relative change of power on the load before and after insertion. Note. The unit of attenuation is expressed in decibels (dB). [Source. JJF1188-2008, 8.1, with modification] A.1.7 Standing wave ratio The ratio of the amplitude of the antinode of the standing wave to the amplitude of the node. [Source. GB/T 1417-1978, 1.12.14] A.1.8 Electromagneticenvironment The sum of all electromagnetic phenomena that exist in a given place. Note. Usually, the electromagnetic environment is related to time, and its description may require statistical methods. [Source. GB/T 4365-2003,161-01-01] A.1.9 Electromagnetic disturbance Any electromagnetic phenomenon that may cause degradation of device, equipment, or system performance or adversely affect biological or non-living organisms. Note. Electromagnetic disturbance may be caused by electromagnetic noise, unwanted signals or changes in the propagation medium itself. [Source. GB/T 4365-2003,161-01-05] A.1.10 Electromagnetic interference;EMI The performance degradation of equipment, transmission channels or systems caused by electromagnetic disturbance indicates the consequences. Note 1.The terms "electromagnetic disturbance" and "electromagnetic interference" mean "cause" and "consequence" respectively. Note 2.In the past, "electromagnetic disturbance" and "electromagnetic interference" were often used together. [Source. GB/T 4365-2003,161-01-06] A.1.11 Electromagnetic compatibility electromagnetic compatibility; EMC The equipment or system can work normally in its electromagnetic environment and does not constitute unbearable electromagnetic disturbance to anything in the environment ability. [Source. GB/T 4365-2003,161-01-07] A.1.12 Characteristic impedance Z0 The ratio of the incident wave voltage to the incident wave current on the transmission line, or the negative value of the ratio of the reflected wave voltage to the reflected wave current. Z0= εr ln Where. Z0---Characteristic impedance of the coaxial line, in ohms (Ω); D ---The inner diameter of the outer conductor of the coaxial line, in meters (m); d ---The outer diameter of the inner conductor of the coaxial line, in meters (m); εr --- The relative permittivity of the filling medium between the inner and outer conductors. Note 1.Common characteristic impedance of coaxial cable is 50Ω and 75Ω. Note 2.The waveguide transmits dispersive waves, and the characteristic impedance has different values for the different wave types transmitted. [Source. JJF1188-2008, 6.2, with modification] A.1.13 Reflection coefficient The ratio of the reflected wave amplitude to the incident wave voltage amplitude at any point on the microwave transmission line. [Source. 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