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Wave absorption cone for anechoic chambers
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A technology for anechoic chambers and cones, applied in applications, household appliances, electrical components, etc., can solve the problems of high cost and large consumption of anechoic chambers, and achieve good frost resistance and corrosion resistance, good structural compactness, and mechanical strength The effect of excellent performance
Active Publication Date: 2018-12-25
GUANGZHOU UNIVERSITY
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Abstract
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Problems solved by technology
If the inner walls and ceiling of the anechoic chamber are covered with such triangular pyramid-structured absorbing materials, the consumption will be very large, resulting in high cost of the anechoic chamber.
Method used
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preparation example Construction
[0051] The preparation method of the electromagnetic wave transmissive composite material comprises the following steps:
[0052] (1) prepare alkali activator: water, water glass and sodiumhydroxide are mixed, stir, then leave standstill 24h, obtain alkali activator; By mass ratio, water: water glass: sodiumhydroxide=(45~55 ):1:2;
[0053] (2) Preparation of the first alkali-activated slag cementitious material: add fly ash and slag to a slurry mixer, stir evenly to obtain a mixed ash body, then add an alkali activator, and stir evenly to obtain the first alkali-activated slag Cementitious material; by mass ratio, fly ash: slag = (7:5) ~ (10:3), mixed ash body: alkali activator = 1: (0.4 ~ 0.5);
[0055] (4) Wash the expanded polystyrene particles with deionized water for 2-3 times, and then dry ...
Embodiment 1
[0069] Embodiment 1 provides an electromagnetic wave transmissioncomposite material, the preparation method of which includes the following steps:
[0070] (1) prepare alkali activator: mix water, water glass and sodium hydroxide, stir 8~10min, then leave standstill 24h, obtain alkali activator; By mass ratio, water: water glass: sodium hydroxide=50: 1:2;
[0071] (2) Preparation of the first alkali-activated slag cementitious material: add fly ash and slag to a slurry mixer, stir for 120-150 seconds to obtain a mixed ash body, then add an alkali activator, and stir for 4-5 minutes to obtain the first A kind of alkali-activated slag cementitious material; By mass ratio, fly ash: slag=7:3, mixed ash body: alkali activator=1:0.4;
[0072] (3) Sodiumbicarbonate is added in the epoxy resin glue, stirs 3~5min, obtains mixture A; According to mass volume ratio, sodium bicarbonate:epoxy resin glue=1g:10mL;
[0080] Embodiment 2 provides an electromagnetic wave transmissioncomposite material, the preparation method of which includes the following steps:
[0081] (1) prepare alkali activator: mix water, water glass and sodium hydroxide, stir 8~10min, then leave standstill 24h, obtain alkali activator; By mass ratio, water: water glass: sodium hydroxide=45: 1:2;
[0082] (2) Preparation of the first alkali-activated slag cementitious material: add fly ash and slag to a slurry mixer, stir for 120-150 seconds to obtain a mixed ash body, then add an alkali activator, and stir for 4-5 minutes to obtain the first A kind of alkali-activated slag cementitious material; By mass ratio, fly ash: slag=7:5, mixed ash body: alkali activator=1:0.45;
[0083] (3) Sodium bicarbonate is added in the epoxy resin glue, stirs 3~5min, obtains mixture A; According to mass volume ratio, sodium bicarbonate:epoxy resin glue=2g:30mL;
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Abstract
The invention discloses a wave absorption cone for anechoic chambers. The wave absorption cone is a hollow quadrangular pyramid. The hollow quadrangular pyramid comprises a square bottom plate and four isosceles triangle side plates. The bottom plate and the side plates of the quadrangular pyramid are sequentially provided with electromagnetic wave transmissionlayers, electromagnetic wave loss layers and electromagnetic wave transmissionlayers from the outside to the inside. The electromagnetic wave transmission layers are extremely high in electromagnetic wave transmittance, accordingly, electromagnetic waves can be easily subjected to incidence in the corresponding electromagnetic wave loss layer of each face plate and further can be dissipated and absorbed, and residual electromagnetic waves which are transmitted through the electromagnetic wave loss layers can continue being subjected to incidence in the corresponding electromagnetic wave loss layers of the other face plates of the same wave absorption cone and can continue being dissipated and absorbed. The wave absorption cone has the advantages that the wave absorption cone has excellent electromagnetic wave absorption andloss functions; the wave absorption cone is of a hollow quadrangular pyramid structure and is low in material consumption and manufacturing cost, and accordingly the manufacturing costs of the anechoic chambers can be reduced to a great extent; the wave absorption cone is further excellent in mechanical property and high in strength, is integrally light and is firm and durable, and accordingly the requirements of building engineering can be met.
Description
technical field [0001] The invention relates to an electromagnetic wave-absorbing material, in particular to a wave-absorbing cone used in an anechoic chamber. Background technique [0002] The anechoic room is also called shielded dark room, or non-reflection shielded room, which is composed of electromagnetic shielding room and radio frequency absorbing material. An anechoic chamber with all six inner surfaces covered with absorbing materials is called a full anechoic chamber, which can simulate free space; an anechoic chamber with four inner surfaces and ceilings covered with absorbing materials, and the ground as a reflective surface is called a semi-darkened chamber, which can simulate open space. proving ground. The anechoic chamber is an ideal place for electromagnetic compatibility tests. Since there is no reflected wave in the room, when measuring the radiation emission electromagnetic disturbance and radiation sensitivity of the equipment under test, it will not c...
Claims
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Application Information
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