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Electromagnetic shielding device for mobile phone antenna made of negative magnetic permeability material

A technology of negative magnetic permeability materials and mobile phone antennas, applied in the fields of magnetic field/electric field shielding, antenna coupling, electrical components, etc. Inconvenient to use and carry wired earphones, etc., to achieve the effect of mature preparation methods and technologies

Inactive Publication Date: 2011-12-14
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used method is to use plug-in wire earphones to reduce the damage of electromagnetic radiation to the human brain, but plug-in wire earphones are inconvenient to use and carry; another method is to use anti-radiation patches and stick them on the listening hole to shield the electromagnetic radiation. Radiation, but the electromagnetic radiation source of the mobile phone mainly comes from the antenna rather than the receiving hole. Therefore, the use of anti-radiation patches basically does not achieve the purpose of preventing electromagnetic radiation; the third common method is to add a metal plate on the side of the mobile phone close to the brain , the disadvantage is that it is easy to interfere with the signal sent by the mobile phone, affect the standing wave ratio of the antenna, and reduce the radiation efficiency of the antenna, etc.
It can be seen that the above methods have different shortcomings and cannot well inhibit the damage of electromagnetic radiation to the brain.

Method used

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  • Electromagnetic shielding device for mobile phone antenna made of negative magnetic permeability material
  • Electromagnetic shielding device for mobile phone antenna made of negative magnetic permeability material
  • Electromagnetic shielding device for mobile phone antenna made of negative magnetic permeability material

Examples

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Effect test

Embodiment 1

[0014] In this embodiment, the negative magnetic permeability material in the antenna electromagnetic shielding device is a fractal structure negative magnetic permeability material, and a three-level structure of radial branches is used. The schematic diagram of this embodiment is as follows figure 1 , 2 shown. In order to make it resonate at the working frequency of the mobile phone, the geometric parameters of the prepared metal copper radial fractal tree structure are: the first-level line length a=3.8mm-4.2mm, the second-level line length b=2.7mm-3.2mm, and the third-level line length b=2.7mm-3.2mm. Level line length c=1.8mm-2.2mm, branch angle θ=30°-60°, line width w=0.1mm-0.4mm, spacing d=3mm-5mm between branch fractal structural units, metal copper thickness t=0.02 mm-0.05mm.

Embodiment 2

[0016] In this embodiment, the negative magnetic permeability material structural unit in the antenna electromagnetic shielding device is a "concave" resonant ring, such as image 3 shown. For the induction of electromagnetic waves in the GSM frequency band, the geometric dimensions of the prepared metal copper resonant ring are: l 1 =10mm-12mm, l 2 =8.5mm-9.5mm, l 3 =7.5mm-8.2mm, g=0.3mm-0.6mm, line width w=0.3mm-0.5mm, ring spacing d 1 =2mm-4mm; For the induction of electromagnetic waves in the DCS frequency band, the geometric dimensions of the prepared metal copper resonant ring are: l 1 =5.5mm-6.5mm, l 2 =4.5mm-5mm, l 3 =3.5mm-4mm, g=0.2mm-0.4mm, line width w=0.1mm-0.25mm, ring spacing d 2 = 2mm-4mm, distance between two resonant rings with different geometric sizes d = 2mm-4mm, thickness of all metal copper t = 0.02mm-0.05mm.

Embodiment 3

[0018] In this embodiment, the negative magnetic permeability material structural unit in the antenna electromagnetic shielding device is a "spiral" resonant ring, such as Figure 4 shown. For the induction of electromagnetic waves in the GSM frequency band, the geometric dimensions of the prepared metal copper resonant ring are: l 1 =9mm-11mm, l 2 =7.5mm-8mm, l 3 =5mm-6.5mm, l 4 =3.5mm-4.2mm, l 5 =2mm-3mm, line width w=0.3mm-0.5mm, ring spacing d 1 =2mm-4mm; For the induction of electromagnetic waves in the DCS frequency band, the geometric dimensions of the prepared metal copper resonant ring are: l 1 =4mm-5.5mm, l 2 =3.5mm-4mm, l 3 =2.7mm-3.1mm, l 4 =1.7mm-2mm, l 5 =1mm-1.5mm, line width w=0.1mm-0.25mm, ring spacing d 2 = 2mm-4mm, distance between two resonant rings with different geometric sizes d = 2mm-4mm, thickness of all metal copper t = 0.02mm-0.05mm.

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Abstract

The invention relates to an electromagnetic shielding device for a mobile phone antenna, in particular to an electromagnetic shielding device for a mobile phone antenna made of negative magnetic permeability material. Its main feature is that a layer of negative magnetic permeability material is installed between the mobile phone antenna and the side of the mobile phone inner casing close to the human brain, and the negative magnetic permeability material is connected to the circuit board through rivets. The negative magnetic permeability material is composed of periodically arranged "spiral", "concave" or dendritic fractal resonant rings. The band gap effect of the negative magnetic permeability material is used to suppress the electromagnetic waves radiated to the direction of the human brain. The microwave power of the human brain is attenuated by more than 15dB. The invention is simple and easy to implement, keeps the parts of the mobile phone unchanged, and can be conveniently used for any built-in mobile phone antenna.

Description

technical field [0001] The invention relates to an electromagnetic shielding device for a mobile phone antenna, in particular to an electromagnetic shielding device for a mobile phone antenna made of a negative magnetic permeability material, which uses the band gap effect of the negative magnetic permeability material to suppress electromagnetic radiation leakage and reduce damage to the human brain. Background technique [0002] Electromagnetic radiation pollution is the fifth largest pollution following the three wastes and noise pollution, and some household appliances, office equipment, and communication tools that are closely related to people's lives inevitably have electromagnetic wave radiation during work. Electromagnetic waves are intangible and invisible, but they exist and endanger human health, especially the electromagnetic waves emitted by microwave frequency equipment are even more harmful to the human body, such as causing brain tumors and leukemia. Therefo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/52H05K9/00
Inventor 赵晓鹏刘亚红
Owner NORTHWESTERN POLYTECHNICAL UNIV
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