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W-type ferrite absorbent for millimeter waves

A ferrite and millimeter wave technology, applied in other chemical processes, chemical instruments and methods, etc., can solve problems such as the need for further improvement of microwave absorption performance, failure to meet high loss, and influence of microwave absorption performance, etc., to achieve operational and technological processes Simple and pollution-free, excellent wave-absorbing performance, and the effect of large molecular magnetic moment

Inactive Publication Date: 2013-12-25
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, metal soft magnetic materials and ferrite materials are widely used in absorbing materials. However, in the frequency band of 26.5GHz to 40GHz, the magnetic permeability of metal soft magnetic materials is very low, and the magnetic loss performance is poor. In addition, Metal soft magnetic materials have high electrical conductivity. When used at high frequency, the dielectric constant will drop sharply due to the effect of eddy current loss, which will affect the overall wave-absorbing performance of the material.
Most of the traditional ferrite materials are used below 18GHz. When it is used in the frequency range of 26.5GHz to 40GHz, the magnetic permeability is very small, which cannot meet the requirements of high loss.
For this reason, the present inventor discloses a preparation method of a millimeter-wave band electromagnetic wave absorber in an invention patent with a publication number of CN103011792A and a publication date of 2013.04.03. The method prepares an M-type barium hexagonal ferrite electromagnetic wave absorber at 26.5 GHz-40GHz frequency band has high absorption loss, high resistivity, and low dielectric constant, but its raw material cost is high, and its absorbing performance needs to be further improved

Method used

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  • W-type ferrite absorbent for millimeter waves
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Examples

Experimental program
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Effect test

Embodiment 1

[0021] A W-type ferrite absorber for millimeter waves, the content (mass percentage) of each component of the W-type ferrite material is calculated as:

[0022] BaCO 3 : 11.86wt%, Co 2 o 3 : 1.05wt%, ZnO: 10.01wt%, Fe 2 o 3 : 77.08wt%

[0023] It is prepared by the traditional solid-state reaction method, the pre-calcination temperature is 1290°C, and the sintering temperature is 1280°C.

[0024] The electromagnetic parameter test of the prepared W-type ferrite absorber (sample 1) shows that the natural resonance frequency of the ferrite absorber is 33.1GHz, and the peak values ​​of the real and imaginary parts of the magnetic permeability are 1.70 and 1.07, respectively. .

Embodiment 2

[0026] A W-type ferrite absorber for millimeter waves, the content (mass percentage) of each component of the W-type ferrite material is calculated as:

[0027] BaCO 3 : 12.08wt%, Co 2 o 3 : 1.51wt%, ZnO: 9.12wt%, Fe 2 o 3 : 77.29wt%

[0028] It is prepared by the traditional solid-state reaction method, the pre-calcination temperature is 1290°C, and the sintering temperature is 1280°C.

[0029] The electromagnetic parameter test of the prepared W-type ferrite absorber (sample 2) shows that the natural resonance frequency of the ferrite absorber is 31.6GHz, and the peak values ​​of the real and imaginary parts of the magnetic permeability are 1.68 and 1.08, respectively. .

Embodiment 3

[0031] A W-type ferrite absorber for millimeter waves, the content (mass percentage) of each component of the W-type ferrite material is calculated as:

[0032] BaCO 3 : 12.29wt%, Co 2 o 3 : 2.03wt%, ZnO: 8.21wt%, Fe 2 o 3 : 77.47wt%

[0033] It is prepared by the traditional solid-state reaction method, the pre-calcination temperature is 1290°C, and the sintering temperature is 1280°C.

[0034] The electromagnetic parameter test of the prepared W-type ferrite absorber (sample 3) shows that the natural resonance frequency of the ferrite absorber is 30.2GHz, and the peak values ​​of the real and imaginary parts of the magnetic permeability are 1.74 and 1.04, respectively .

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Abstract

The invention aims to provide a W-type ferrite absorbent for millimeter waves, namely the absorbent used for the frequency band from 26.5GHz to 40GHz. The preparation raw materials of the absorbent are BaCO3, Co2O3, ZnO and Fe2O3; the traditional solid phase reaction method is used in the invention, the main steps are dosing, ball-milling, pre-burning, crushing and sintering, so as to prepare the W-type ferrite absorbent. The W-type ferrite absorbent prepared by the invention has the advantages of high magnetic conductivity, high magnetic loss, lower dielectric constant and the like on the frequency band from 26.5GHz to 40GHz, and the disadvantages of metal soft magnetic material absorbents and common ferrite absorbents are overcome, therefore, the formed ferrite has excellent wave absorbing property; compared with the M-type ferrite absorbent, both Co2O3 and ZnO in the preparation raw materials are cheaper and more available than CoO and TiO2, and furthermore, the Co replacement amount is low and the sintering temperature is reduced, therefore, the cost is reduced effectively, and the wave absorbing property is more excellent.

Description

technical field [0001] The invention relates to a W-type hexagonal ferrite material, which is an absorber for the millimeter wave band made of the W-type hexagonal ferrite material. Background technique [0002] In recent years, modern mobile communication technology has become more and more popular around the world. With the increasing number of users, especially the rapid development of mobile Internet technology, the information capacity of mobile communication has increased rapidly. In order to accommodate the ever-increasing traffic, modern microwave , mobile communications, etc. are bound to develop into higher frequency fields, but the subsequent electromagnetic environment has also become extremely complex. The electromagnetic waves radiated by various electronic systems have caused great harm to the human body, which has caused people to worry about the living environment. Urgent concern. [0003] One of the most direct ways to solve the problem of electromagnetic ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C09K3/00
Inventor 谢建良董长顺曹振华杨宏伟邓龙江
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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