CN102123186A - Method for solving electromagnetic compatibility of antennae of mobile phone - Google Patents
Method for solving electromagnetic compatibility of antennae of mobile phone Download PDFInfo
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- CN102123186A CN102123186A CN2011100304821A CN201110030482A CN102123186A CN 102123186 A CN102123186 A CN 102123186A CN 2011100304821 A CN2011100304821 A CN 2011100304821A CN 201110030482 A CN201110030482 A CN 201110030482A CN 102123186 A CN102123186 A CN 102123186A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 20
- 239000004744 fabric Substances 0.000 claims abstract description 5
- 239000006260 foam Substances 0.000 claims description 4
- 230000005855 radiation Effects 0.000 abstract description 15
- 238000012360 testing method Methods 0.000 abstract description 7
- 230000005404 monopole Effects 0.000 abstract description 5
- 229920000742 Cotton Polymers 0.000 abstract 1
- 238000009825 accumulation Methods 0.000 abstract 1
- 230000005672 electromagnetic field Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 210000004556 brain Anatomy 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 208000002173 dizziness Diseases 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000008821 health effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Abstract
The invention discloses a method for solving electromagnetic compatibility of an antennae of a mobile phone, a monopole antenna is selected as the antenna of a small-sized terminal mobile phone; the monopole antenna is connected with an antenna matching circuit; a metal frame is arranged in the front casing of the mobile phone; the metal frame is provided with an opening; or the metal frame is connected with an earthing region of a printed circuit board (PCB) mainboard by utilizing conductive fabric and electric vesicant cotton. In the method provided by the invention, the metal frame is utilized to disperse the current of PCB mainboard of the mobile phone, so as to lead the current to be distributed evenly; and the current accumulation is avoided; the peak value generated in a synthetic aperture radar test is lowered, thereby solving the requirements of the over the air (OAT) of the far-field radiation, and satisfying the SAR requirement of the near-field radiation. By using the method provided by the invention, the antenna volume can be smaller on the premise of satisfying the electromagnetic compatibility, and the specification requirements of SAR and OTA test are satisfied.
Description
Technical field
The present invention relates to the Miniature Terminal mobile phone, relate in particular to a kind of Electro Magnetic Compatibility method that solves antenna for mobile phone.
Background technology
Along with the development of information technology, the popular various whiles easily that bring at the enjoyment Wireless Telecom Equipment, also the electromagnetic radiation of growing interest wireless communication terminal is to health effects.Wireless communication device handset often adopts common printed circuit antenna form or monopole antenna.This class antenna is to satisfy common OTA(Over The Air) requirement, but at Electro Magnetic Compatibility index-SAR(Specific Absorption Rate), but nearly all can not satisfy.This also is the bottleneck of present Miniature Terminal antenna development.SAR is meant will produce induction field in the human body under the effect of external electromagnetic field.Because the various organs of human body are lossy dielectric, so electromagnetic field will produce electric current in the body, causes absorbing and the dissipation electromagnetic energy.The RF energy of antenna for mobile phone institute radiation can be absorbed by the body and produce heat, and transmits by the body heat regulation system of human body.The RF electromagnetic wave energy ratio that tissue absorbed or consumed of unit mass just is called SAR.Being commonly referred to as electro-magnetic wave absorption ratio or specific absorption rate, is that the electromagnetic wave energy of mobile phone or wireless product absorbs ratio, and unit is W/kg.The test of SAR is the radio wave energy that produces via mobile phone, and measuring actually by testing equipment, how many electromagenetic wave radiations human body (just brain or health) has absorbed.
What SAR studied is under the effect of external electromagnetic field, will produce induction field in the human body.Because the various organs of human body are lossy dielectric, so electromagnetic field will produce electric current in the body, causes absorbing and the dissipation electromagnetic energy.For example people can follow the air time long more in the process of making a phone call, and human brain can produce the dizzy brain phenomenon of dusk, the problem of SAR is about to research that Here it is.
At present, be used for the antenna of Miniature Terminal, antenna body is dipole antenna normally.But along with mobile miniaturization terminal develops toward lightening direction, the space of leaving the miniaturization terminal antenna for is also more and more littler, at this time uses monopole antenna can satisfy the communication need of miniaturization terminal equipment, also can satisfy the demand of multifrequency and wideband.Along with the proposition of Electro Magnetic Compatibility index, not only the antenna of Miniature Terminal there is the requirement of emission and acceptance, also have the requirement of SAR.Here it is has produced the contradiction of far-field radiation and near-field thermal radiation.
At present, do not have effective and lower-cost solution in the industry, general solution all is the performance index by the reduction far-field radiation, just reduces the index of OTA, and it is up to standard to exchange near field SAR for.
But run into the index request of international well-known operator, not only require OTA but also require SAR, often just powerless.This has also just become the development bottleneck of present miniaturization terminal antenna.
Summary of the invention
The problem that the present invention need solve provides and a kind ofly makes antenna volume do forr a short time under the prerequisite of Electro Magnetic Compatibility and satisfy the requirement of OTA of far-field radiation and the Electro Magnetic Compatibility method of the solution antenna for mobile phone that the SAR of near-field thermal radiation requires satisfying.
To achieve these goals, the present invention designs a kind of Electro Magnetic Compatibility method that solves antenna for mobile phone, choose the antenna of unipole antenna as the Miniature Terminal mobile phone, described unipole antenna is connected with antenna-matching circuit, in handset front case, install metal frame additional, described metal frame is provided with opening, or make metal frame utilize conductive fabric or conducting foam to be connected with the ground area of PCB mainboard, cardinal principle is disperseed mobile phone PCB mainboard electric current for utilizing this metal frame, make CURRENT DISTRIBUTION even, avoid electric current to pile up, the peak value that produces when SAR tests reduces, thereby solved the requirement of the OTA of far-field radiation, satisfied the SAR requirement of near-field thermal radiation again.
More preferably, opening respectively on of metal frame or two or three or four angles.
More preferably, described antenna-matching circuit is a PI form match circuit, and described PI form match circuit is ∏ type multiple-series-parallel form match circuit.
The inventive method use the monopole antenna form and the handset front case metal frame do that opening is handled or
The person makes metal frame utilize conductive fabric or conducting foam to be connected the emc issue that has solved antenna for mobile phone with the ground area of PCB mainboard, satisfy the SAR index, reduce the Miniature Terminal antenna volume, satisfied under the index of SAR, can satisfy the requirement of OTA test specification again.
The inventive method stems from antenna theory and well understanding electromagnetic Compatibility Design, according to Theory of Electromagnetic Field and radio circuit, the combination demonstration of analog circuit theory, reliable theoretical foundation is proposed, create a cover from solving the technological means of the existing problem of prior art in essence, guaranteed under any circumstance can improve antenna performance in varying degrees, and can also make it to satisfy the index of Electro Magnetic Compatibility.From having solved the contradiction index request of far-field radiation and near-field thermal radiation in essence.
It is on the Miniature Terminal communication product of representative that the present invention is applied to the mobile phone, is specially adapted to comprise on the products such as mobile phone, MID.The present invention mainly improves the antenna of products such as existing mobile phone, MID, RF module, fore shell, PCB ground area etc., and its change scope is few, easily implements.
Description of drawings:
Fig. 1 is the metal frame structural representation that the present invention solves the Electro Magnetic Compatibility method of antenna for mobile phone.
Embodiment
For the ease of those skilled in the art's understanding, structural principle of the present invention is described in further detail below in conjunction with specific embodiment and accompanying drawing:
As shown in Figure 1, a kind of Electro Magnetic Compatibility method that solves antenna for mobile phone.It chooses the antenna of unipole antenna as the Miniature Terminal mobile phone, described unipole antenna is connected with antenna-matching circuit, in handset front case 1, install metal frame 2 additional, can be at four jiaos of A of metal frame or B or C or D place opening respectively, or make metal frame utilize conductive fabric or conducting foam to be connected with the ground area of PCB mainboard.
Cardinal principle of the present invention is disperseed mobile phone PCB mainboard electric current for utilizing this metal frame, make CURRENT DISTRIBUTION even, avoid electric current to pile up, the peak value that produces when SAR tests reduces, thereby solved the requirement of the OTA of far-field radiation, satisfied the SAR requirement of near-field thermal radiation again.
Antenna-matching circuit of the present invention is a PI form match circuit, and described PI form match circuit is ∏ type multiple-series-parallel form match circuit
Foregoing is preferred embodiment of the present invention only, is not to be used to limit embodiment of the present invention, and those skilled in the art are according to design of the present invention, and appropriate adaptation of having done or modification all should be within protection scope of the present invention.
Claims (3)
1. Electro Magnetic Compatibility method that solves antenna for mobile phone, it is characterized in that: choose the antenna of unipole antenna as the Miniature Terminal mobile phone, described unipole antenna is connected with antenna-matching circuit, in handset front case, install metal frame additional, described metal frame is provided with opening, or makes metal frame utilize conductive fabric or conducting foam to be connected with the ground area of PCB mainboard.
2. the Electro Magnetic Compatibility method of solution antenna for mobile phone according to claim 1 is characterized in that: opening respectively on of metal frame or two or three or four angles.
3. the Electro Magnetic Compatibility method of solution antenna for mobile phone according to claim 1 and 2 is characterized in that: described antenna-matching circuit is a PI form match circuit, and described PI form match circuit is ∏ type multiple-series-parallel form match circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100304821A CN102123186A (en) | 2011-01-28 | 2011-01-28 | Method for solving electromagnetic compatibility of antennae of mobile phone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100304821A CN102123186A (en) | 2011-01-28 | 2011-01-28 | Method for solving electromagnetic compatibility of antennae of mobile phone |
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| CN102123186A true CN102123186A (en) | 2011-07-13 |
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| CN2011100304821A Pending CN102123186A (en) | 2011-01-28 | 2011-01-28 | Method for solving electromagnetic compatibility of antennae of mobile phone |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013097458A1 (en) * | 2011-12-27 | 2013-07-04 | 中兴通讯股份有限公司 | Motherboard structure and wireless terminal |
| CN104184851A (en) * | 2013-05-24 | 2014-12-03 | 步步高通信科技有限公司 | Mobile terminal |
| US9131037B2 (en) | 2012-10-18 | 2015-09-08 | Apple Inc. | Electronic device with conductive fabric shield wall |
| CN111308322A (en) * | 2020-03-17 | 2020-06-19 | 集美大学 | An IC Electromagnetic Compatibility Test Device Based on TEM Cell |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040023682A1 (en) * | 2000-09-04 | 2004-02-05 | Lee Tae Yune | Mobile phone having reduced specific absorption rate (SAR) using an antenna housed to ensure enhanced antenna gain |
| US20040046701A1 (en) * | 2001-03-07 | 2004-03-11 | Stefan Huber | Radio communications device comprising an sar value-reducing correction element |
-
2011
- 2011-01-28 CN CN2011100304821A patent/CN102123186A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040023682A1 (en) * | 2000-09-04 | 2004-02-05 | Lee Tae Yune | Mobile phone having reduced specific absorption rate (SAR) using an antenna housed to ensure enhanced antenna gain |
| US20040046701A1 (en) * | 2001-03-07 | 2004-03-11 | Stefan Huber | Radio communications device comprising an sar value-reducing correction element |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013097458A1 (en) * | 2011-12-27 | 2013-07-04 | 中兴通讯股份有限公司 | Motherboard structure and wireless terminal |
| US9131037B2 (en) | 2012-10-18 | 2015-09-08 | Apple Inc. | Electronic device with conductive fabric shield wall |
| CN104184851A (en) * | 2013-05-24 | 2014-12-03 | 步步高通信科技有限公司 | Mobile terminal |
| CN111308322A (en) * | 2020-03-17 | 2020-06-19 | 集美大学 | An IC Electromagnetic Compatibility Test Device Based on TEM Cell |
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Application publication date: 20110713 |