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China Mobile 4G full band absorbing material, and preparation method and application thereof

A wave-absorbing material, China Mobile's technology, applied in the field of wave-absorbing materials, can solve the problems of poor low-frequency absorption performance and large-spectrum characteristics, etc., achieve excellent wave-absorbing performance, enhance signal-to-noise ratio capability, and achieve the effect of impedance matching

Active Publication Date: 2016-11-02
南京威勒信息技术科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbonyl iron powder is a relatively common magnetic absorbing material, but it has a large complex dielectric constant and poor spectral characteristics, and its low-frequency absorption performance is not good. Generally, the complex dielectric of carbonyl iron powder is adjusted by coupling agent or surfactant. The ratio of electric constant and complex permeability is used to improve its impedance matching characteristics and thus improve the absorbing performance

Method used

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  • China Mobile 4G full band absorbing material, and preparation method and application thereof
  • China Mobile 4G full band absorbing material, and preparation method and application thereof
  • China Mobile 4G full band absorbing material, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A preparation method of China Mobile 4G full-band wave-absorbing material, comprising the following steps:

[0036] Get 200g of carbonyl iron powder raw material. Preheat the carbonyl iron powder raw material before high-energy ball milling, and preheat the raw material at 120°C for 3 hours under the protection of argon; add 2ml of silane coupling agent KH-570 and 4.4g of magnesium stearate, and add 150ml of anhydrous ethanol is stirred evenly and mixed, then put into the ball mill tank and sealed, then wet milled, the large ball of stainless steel ball in the planetary ball mill middle ball small ball The weight ratio of the carbonyl iron powder is 10:80:80, the total weight of the three is 1800g, the ball milling time is 15 hours, and the speed is 300r / min; The carbonyl iron powder raw material and the compounding auxiliary agent (silane coupling agent and surfactant stearate) are uniformly mixed, and a dense and uniform organic insulating film is formed on the ...

Embodiment 2

[0039] A preparation method of China Mobile 4G full-band wave-absorbing material, comprising the following steps:

[0040] Get 200g of carbonyl iron powder raw material. Preheat the carbonyl iron powder raw material before high-energy ball milling, and preheat the raw material at 120°C for 3 hours under the protection of argon; add 2ml of silane coupling agent KH-550 and 1g of sodium stearate, and add 150ml Anhydrous ethanol is stirred evenly and mixed, then put into the ball mill tank and sealed, then wet milled, the large ball of stainless steel ball in the planetary ball mill middle ball small ball The weight ratio of the carbonyl iron powder is 10:80:80, the total weight of the three is 1800g, the ball milling time is 15 hours, and the speed is 300r / min; The carbonyl iron powder raw material and the compounding auxiliary agent (silane coupling agent and surfactant stearate) are uniformly mixed, and a dense and uniform organic insulating film is formed on the surface o...

Embodiment 3

[0043] A preparation method of China Mobile 4G full-band wave-absorbing material, comprising the following steps:

[0044] Take 200g of carbonyl iron powder raw material, preheat the carbonyl iron powder raw material before high-energy ball milling, preheat the raw material at 130°C for 4 hours under the protection of argon; add 3ml silane coupling agent KH-550 and 2g Sodium stearate, and add 200ml of absolute ethanol and stir to mix evenly, put it into the ball mill tank and seal it, then carry out wet milling, the large ball of stainless steel ball in the planetary ball mill middle ball small ball The weight ratio of the carbonyl iron powder is 10:60:60, the total weight of the three is 1800g, the ball milling time is 12 hours, and the rotation speed is 100r / min; The carbonyl iron powder raw material and the compounding auxiliary agent (silane coupling agent and surfactant stearate) are uniformly mixed, and a dense and uniform organic insulating film is formed on the su...

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Abstract

The invention discloses a China Mobile 4G full band absorbing material, and a preparation method and application thereof. A composite auxiliary agent of a silane coupling agent and a stearate surfactant is added to a carbonyl iron powder, and a high-energy ball milling process is carried out to prepare a sheet-shape carbonyl iron powder absorbing material with excellent impedance matching performance. The material can meet the following requirements: in the frequency range from 1 to 18 GHz, an absorbing coating has thickness of less than or equal to 2mm; the absorbing material has -8dB absorption bandwidth reaching 1.5GHz (1.3-2.8GHz), which completely covers the whole band of China Mobile 4G (1.8GHz-2.8GHz); the proportion of the silane coupling agent and stearate can be adjusted to obtain proper sheet structure and size, thus changing the relationship between the complex permittivity and complex permeability to reach impedance matching, and then adjusting the absorption peak position. The material achieves the purpose of selecting absorption interference noise at three arbitrary main frequencies of China Mobile 4G and improving the signal-to-noise ratio of the base station and mobile terminal.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a China Mobile 4G full-band wave-absorbing material, its preparation method and application. Background technique [0002] In today's society, with the advancement of science and technology, electromagnetic transmission applications such as communications, radar, and microwaves are becoming more and more widely used. These electromagnetic wave transmissions are pervasive, making the modern social environment full of electromagnetic radiation. China Mobile's 4G electromagnetic wave signals have wide coverage and high intensity, but All kinds of electromagnetic radiation force China Mobile's 4G signal to spread in an environment full of electromagnetic radiation pollution. This electromagnetic radiation pollution may generate noise signals, seriously affecting the sensitivity of China Mobile's 4G signal reception, making it difficult for users to receive accurate si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/16C09K3/00
CPCC01G49/16C01P2004/03C09K3/00
Inventor 谢国治陈文俊王锰刚胡晶顾家新陈将伟
Owner 南京威勒信息技术科技有限公司
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