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Metamaterial microstrip line based radiation-proof mobile phone enclosure

A technology of anisotropic medium and microstrip line, which is applied in the direction of telephone structure, electrical components, magnetic field/electric field shielding, etc., can solve the problems of reducing antenna human body radiation, poor practicability, and limited application range, etc.

Inactive Publication Date: 2011-07-13
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many ways to use the former, but most of them reduce the radiation of the antenna to the human body and also reduce the transceiver performance of the antenna, and because the appearance of the original design of the mobile phone has been greatly changed, the practicability is not strong
Although the practical method of plugging in wired earphones can better reduce the radiation damage of the mobile phone to the human brain, it is inconvenient to carry and use, which limits its scope of use.

Method used

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  • Metamaterial microstrip line based radiation-proof mobile phone enclosure
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Examples

Experimental program
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Effect test

Embodiment 1

[0021] Using circuit board etching technology to make anisotropic dielectric microstrip line substrate, choose epoxy phenolic resin copper-clad dielectric board, its dielectric constant is = 4.65, board length e = 34.238mm, width f = 7mm, and the thickness of the dielectric substrate is 1.5 mm, the thickness of double-sided copper clad is 0.018mm. Select one side of the substrate as the ground plane, and etch 7 rectangular metal pieces of equal size on the other side along the center line, the length of each metal piece is a=4.238mm, the width b=2.8mm, and the width of the gap between the pieces is c = 0.762 mm. Solder 6 chip capacitors with C=2.0pF in the center of the gap between adjacent metal sheets in sequence, and the two ends are respectively connected to the adjacent metal sheets. And drill a through hole with d=1.2mm in the center of each metal sheet, and then insert a chip inductor of L=1.0nH into each through hole, weld the upper end with the metal sheet, and conne...

Embodiment 2

[0023] Using circuit board etching technology to make anisotropic dielectric microstrip line substrate, choose epoxy phenolic resin copper-clad dielectric board, its dielectric constant is = 4.65, board length e = 34.238mm, width f = 7mm, and the thickness of the dielectric substrate is 1.5 mm, the thickness of double-sided copper clad is 0.018mm. Select one side of the substrate as the ground plane, and etch 7 rectangular metal pieces of equal size on the other side along the center line, the length of each metal piece is a=4.238mm, the width b=2.8mm, and the width of the gap between the pieces is c = 0.762 mm. Weld 6 chip capacitors with C=1.0pF in the center of the gap between adjacent metal sheets in turn, and the two ends are respectively connected to the adjacent metal sheets. In this way, a new type of microstrip transmission line with negative magnetic permeability is produced. image 3 shown. After testing, the S21 transmission curve of the microstrip line is as at...

Embodiment 3

[0025] Using circuit board etching technology to make anisotropic dielectric microstrip line substrate, choose epoxy phenolic resin copper-clad dielectric board, its dielectric constant is = 4.65, board length e = 34.238mm, width f = 7mm, and the thickness of the dielectric substrate is 1.5 mm, the thickness of double-sided copper clad is 0.018mm. Select one side of the substrate as the ground plane, and etch 7 rectangular metal pieces of equal size on the other side along the center line, the length of each metal piece is a=4.238mm, the width b=2.8mm, and the width of the gap between the pieces is c = 0.762 mm. Drill a through hole of d=1.2mm in the center of each section of metal sheet, and then insert a chip inductor of L=1.0nH into each through hole, weld the upper end with the metal sheet, and connect the lower end with the ground plate .In this way, a new type of negative dielectric constant microstrip transmission line is produced. Figure 4 shown. After testing, the...

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Abstract

The invention relates to an anti-radiation shell of a cell phone based on microstrip lines of left-handed medium, which can effectively reduce electromagnetic wave radiation of the cell phone. The microstrip lines of left-handed material used by the shell are formed by periodically inserting a copper plate of epoxy phenolic in a patch of capacitance and inductance. Effect of transmission forbidden band appears in a GSM900M frequency band, thus losing antenna radiation with a central frequency at 900 MHz and parasitic radiation of the cell phone, so as to greatly reduce the electromagnetic radiation of the cell phone on human body. With a simple manufacture technique and low cost, the invention can effectively reduce the electromagnetic radiation of the cell phone without affecting the communication quality.

Description

technical field [0001] The invention relates to a radiation-proof mobile phone casing based on an anisotropic medium microstrip line, which can effectively reduce the antenna radiation and parasitic radiation of the mobile phone by utilizing the band gap characteristic of the anisotropic medium microstrip line. Background technique [0002] With the advancement of science and technology and the rapid development of the electronic industry, the radio communication industry has developed rapidly, especially the rapid development of public mobile phones has brought great convenience to people's information technology exchanges and material and cultural life. However, while providing convenience, due to the design of the mobile phone and the use of the mobile phone, excessive electromagnetic radiation is generated when the mobile phone is talking, which leads to many negative effects and brings many unexpected troubles and hazards. , has become a prominent issue of great concern...

Claims

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Application Information

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IPC IPC(8): H04M1/02H05K9/00
Inventor 赵晓鹏李明明介晓永安涛
Owner NORTHWESTERN POLYTECHNICAL UNIV
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