Negative magnetic-inductive capacity material mobile phone antenna electromagnetic shielding device

A technology of negative magnetic permeability materials and mobile phone antennas, applied in the fields of magnetic/electric field shielding, antenna coupling, electrical components, etc., can solve problems such as failure to prevent electromagnetic radiation, easily interfere with mobile phone signals, and reduce antenna radiation efficiency. The effect of the preparation method and mature technology

Inactive Publication Date: 2008-04-16
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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  • Negative magnetic-inductive capacity material mobile phone antenna electromagnetic shielding device
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  • Negative magnetic-inductive capacity material mobile phone antenna electromagnetic shielding device

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 present invention relates to a cellphone antenna electromagnetic shielding device, in particular to a cellphone antenna electromagnetic shielding device with negative permeability material, and is mainly characterized in that: a layer of negative permeability material is arranged on one side near human brain in the inner shell of the cellphone and the cellphone antenna. The negative permeability material is connected with the circuit board by rivets. The negative permeability material is formed by resonant rings of helix shape, concave character shape or dendritic fractal. The electromagnetic wave radiated toward the brain direction is restrained by band forbidding efficacy of the negative permeability material so that the microwave power radiated on the human brain part is attenuated by more than 15dB. The present invention is simple to carry out while keeping various parts unchanged of the cellphone, and used conveniently for any internal cellphone antennal.

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 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. Therefore, th...

Claims

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Application Information

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IPC IPC(8): H01Q1/52H05K9/00
Inventor 赵晓鹏刘亚红
Owner NORTHWESTERN POLYTECHNICAL UNIV
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