CN101009399B - A method for improving the handset antenna radiation efficiency - Google Patents
A method for improving the handset antenna radiation efficiency Download PDFInfo
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- CN101009399B CN101009399B CN2006100033640A CN200610003364A CN101009399B CN 101009399 B CN101009399 B CN 101009399B CN 2006100033640 A CN2006100033640 A CN 2006100033640A CN 200610003364 A CN200610003364 A CN 200610003364A CN 101009399 B CN101009399 B CN 101009399B
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Abstract
The invention relates to a method of increasing mobile telephone antenna radiant efficiency that mainly includes steps as following: (1) relative elements which are near the antenna are modeled; (2) the antenna is modeled, the main radicalization bar is set conformably in position of the ferromagnetic matter which is far from the mobile telephone loudspeaker and hoop and surrounds the cam medium cutting hole, the assistant radicalization bar is set in position of the ferromagnetic matter which is near the mobile telephone loudspeaker and hoop and definite interval from said main radicalization bar; (3) The simulated debugging confirms the antenna figure which can fulfill the area of antenna is minimized and the radiant efficiency is a lowest value. Said method resolves the contradiction of high antenna radiant efficiency and small antenna size, minimized antenna radiant area and optimized antenna radiant direction graph, and the antenna radiant efficiency is increased, the property of mobile telephone is improved.
Description
Technical field
The present invention relates to a kind of method that improves handset antenna radiation efficiency.
Background technology
Along with the develop rapidly of the communication technology, the volume of mobile phone becomes more and more littler, is also developing towards miniaturization as the antenna of one of mobile phone key element.Existing antenna for mobile phone can't be implemented in guarantees that the antenna distribution area provides sufficiently high radiation efficiency to satisfy communication requirement in the time of less, cause the reason of above-mentioned situation mainly comprise following some:
The first, the element that is disposed in the mobile phone is more and more, and these elements mostly are placed near the antenna, and antenna performance is had a significant effect.Particularly the ferromagnet in the mobile phone loudspeaker, iron hoop etc. all produce very big influence to parameters such as antenna energy radiation efficiency, antenna resonance band center value and impedance matching frequency bandwidths.
The second, the at present known emulation that planar inverted F-shape antenna (PIFA) is carried out is general only to be carried out to laying the formed space structure of aerial radiation bar on the simple pcb board plane, and the gained result is difficult to be applied in the actual antenna for mobile phone design.
The 3rd, the radiation efficiency of existing antenna is difficult for reaching very high numerical value.Its reason has two, and at first, antenna size and radiation efficiency have complicated corresponding relationships.In the PIFA antenna, generally be that the antenna lower room is high more, the antenna lower volume is big more, and then antenna radiation efficiency is high more; But antenna height one regularly, and is excessive if the antenna current Width distributes, and then a plurality of higher modes will occur, and main mould radiant power is reduced, and effectively radiation efficiency descends, so can not improve power through the widen antenna radiation item simply.Secondly, the size of antenna will be considered the requirement of SAR testing standard.Under the big situation of radiant power, improper meeting is designed in antenna space directional diagram, near field and far field exceeds standard the SAR value.
The 4th, antenna for mobile phone has antenna pattern in several principal polarization planes is strict with, and has stipulated best antenna pattern principle.If antenna primary radiation bar is concentrated a side that is laid in mobile phone, then the asymmetry of radiation item will make antenna pattern asymmetry occur.Therefore realize simultaneously that the aerial radiation area minimizes with the radiation pattern optimization very big difficulty is arranged.
The 5th, the radiance of antenna is mainly by primary radiation field zone position and shape, structures shape; The effect of expansion impedance matching frequency bandwidth is played in the auxiliary radiation place, how to control primary radiation place and geometric position, auxiliary radiation place parameter, and the antenna electric performance, the antenna field performance that make it to satisfy simultaneously under the particular requirement are pendent difficult problems.
For these reasons, a kind of method that improves handset antenna radiation efficiency need be provided, the antenna for mobile phone behind feasible the optimization can be implemented in simultaneously to be had less area occupied and has higher radiation efficiency on GSM900, the DCS/PCS frequency range.
Summary of the invention
The invention provides a kind of method that improves handset antenna radiation efficiency, it mainly comprises following step:
(1) becket, the radio frequency interface spare under the antenna coverage areas, COBBAIF spare near the ferromagnetic material near the loudspeaker antenna and iron hoop, camera medium, the antenna area are carried out modeling;
(2) antenna is carried out modeling; Antenna primary radiation bar conformally is laid in away from the ferromagnetic material in the mobile phone loudspeaker and iron hoop and around the position of camera medium cutting hole, the auxiliary radiation bar in the antenna for mobile phone is laid in the position near the ferromagnetic material in the mobile phone loudspeaker and iron hoop and the said primary radiation bar predetermined space of distance space;
(3) confirm to satisfy simultaneously the antenna pattern that antenna distribution area minimum and antenna radiation efficiency equal a minimum threshold through artificial debugging.
In order further to improve the radiation efficiency of antenna for mobile phone; Can also be afterwards in step (3); According to width, the width of auxiliary radiation bar and the space, interval between said two radiation items of the required antenna performance adjustment primary radiation bar that reaches, thus the antenna pattern after confirming to optimize.
Preferably, when in step (2), antenna being carried out modeling, the primary radiation bar of antenna is laid in the tip position of mobile phone, particularly makes the crown center position of the main radiant section of antenna, to reach the purpose of radiation pattern symmetry at mobile phone.
The method of raising handset antenna radiation efficiency of the present invention is from the aerial radiation principle; Adopt conformal, compact mode to lay antenna; Be characterized in making full use of the primary radiation zone of antenna, the auxiliary radiation zone of compression antenna, it is high little with antenna size to have solved antenna radiation efficiency simultaneously; The aerial radiation area minimize and the radiation pattern optimization between contradiction, improved antenna radiation efficiency and gain effectively and improved handset capability.
Description of drawings
In conjunction with accompanying drawing, can better understanding be arranged to above-mentioned brief overview and follow-up detailed description to the preferred embodiment of the present invention, wherein:
After Fig. 1 shows and adopts the inventive method to optimize at antenna primary radiation bar, auxiliary radiation bar distribution map GSM900/DCS/PCS three frequency range work, under the extremely little distribution area state.
Embodiment
When application method of the present invention is improved antenna radiation performance; At first need obtain near becket, the radio frequency interface spare under the antenna coverage areas near the ferromagnetic material in the loudspeaker and the iron hoop antenna, camera medium, the antenna area, the unit for electrical property parameters of COBBAIF spare, and utilize these parameters said elements to be carried out modeling through simulation software through actual debugging and test.
Next need carry out modeling to antenna.As shown in Figure 1ly go out, because ferromagnetic material can absorb the electromagnetic wave energy that antenna is launched in the loudspeaker, and the iron hoop on the loudspeaker can impact the resonance frequency of antenna, therefore should the primary radiation bar 1 of antenna be laid away from the loudspeaker 4 of mobile phone.On the other hand; Camera medium (not shown) dielectric constant in the mobile phone is bigger; Can increase the electrical length in space; Effectively stop electromagnetic wave energy to the conduction of loudspeaker direction, therefore can the primary radiation bar 1 of antenna be closed on the camera setting, minimum for the distribution area that guarantees antenna simultaneously; Can adopt conformal mode to lay the primary radiation bar 1 of antenna, adjust antenna resonance frequency and the purpose that guarantees radiation efficiency two aspects in a big way so that be implemented in around the periphery of camera medium cutting hole 3.
Because mainly by the position of primary radiation bar 1 and shape, structures shape, 2 of auxiliary radiation bars play the effect of expansion impedance matching frequency bandwidth for the performance of antenna, therefore, can auxiliary radiation bar 2 be laid in the position nearer apart from loudspeaker 4.
In order to guarantee that antenna can operate as normal in the GSM/DCS/PCS frequency range, only stay the space (the corresponding GSM working frequency range of this space numerical value is about about 1mm) of corresponding permissible radiation efficiency minimum threshold 30% between the primary radiation bar 1 of antenna and the auxiliary radiation bar 2.When modeling, 2 of the auxiliary radiation bars of antenna are got the narrowest width satisfying the frequency bandwidth requirement, and are connected in the distributing point place of mobile phone.
After antenna is accomplished modeling; Emulation is compared under the different shape; Key feature and parameters such as the CURRENT DISTRIBUTION on the antenna primary radiation bar 1, Electric Field Distribution, efficiency of energy delivery, antenna gain can satisfy the antenna pattern that antenna distribution area minimum and antenna radiation efficiency equal said minimum threshold 30% simultaneously thereby find.
So far, just obtain to satisfy simultaneously distribution area minimum and radiation efficiency and be not less than 30% antenna for mobile phone.
Because antenna primary radiation bar 1 width and antenna higher mode have relation, width more greatly then higher mode is many more, so control antenna primary radiation bar 1 width makes required mode in the antenna radiation GSM/DCS/PCS frequency range, is one of way of raising antenna radiation efficiency; In addition, under the condition that does not increase primary radiation bar 1 width, increase the antenna area coverage and can increase the CURRENT DISTRIBUTION area, increase antenna energy and the effect that reaches omnidirectional radiation.Therefore; In order further to improve the radiation efficiency of antenna for mobile phone; Can also further optimize antenna for mobile phone; According to width, the width of auxiliary radiation bar 2 and the space, interval between said two radiation items of the required antenna performance adjustment antenna primary radiation bar 1 that reaches, thus the antenna pattern after confirming to optimize.
In the process of using the inventive method raising antenna radiation performance; If antenna primary radiation bar 1 is concentrated a side that is laid in mobile phone; Then the asymmetry of primary radiation bar 1 will cause the antenna pattern of antenna asymmetry to occur; Therefore when antenna is carried out modeling, the crown center position that also should be as far as possible the primary radiation bar 1 of antenna be laid in mobile phone is to reach the purpose of radiation pattern symmetry.
As shown in Figure 1; Use obtain after the method optimization of the present invention, can be at antenna GSM900/DCS/PCS three frequency range work, under the extremely little distribution area state; Its distribution area is about 22 * 18 square millimeters; Shared volume is merely 2.8 cubic centimetres, much smaller than 4.2 cubic centimetres of the minimum antenna volume values that has bibliographical information now.In the GSM frequency range, the radiation efficiency of this antenna is between 30% and 45%; In the DCS/PCS frequency range, the radiation efficiency of this antenna is between 35% and 70%, and above-mentioned radiation efficiency has all surpassed the requirement of the minimum threshold 30% of mobile phone radio frequency performance parameter.
The optimization method of the application of the invention; It is high little with antenna size to have solved antenna radiation efficiency simultaneously; The aerial radiation area minimize and the radiation pattern optimization between contradiction, improved antenna radiation efficiency and gain effectively and improved handset capability.
It will be appreciated by those skilled in the art that: under the prerequisite that does not deviate from broad scope of the present invention, can change the foregoing description.Thereby the present invention is not limited in disclosed specific embodiment, and its scope should contain core of the present invention and the interior all changes of protection range that appended claims limits.
Claims (3)
1. a method that improves handset antenna radiation efficiency is characterized in that, this method mainly comprises following step:
(1) becket, the radio frequency interface spare under the antenna coverage areas, COBBAIF spare near the ferromagnetic material near the loudspeaker antenna and iron hoop, camera medium, the antenna area are carried out modeling;
(2) antenna is carried out modeling; Antenna primary radiation bar conformally is laid in away from the ferromagnetic material in the mobile phone loudspeaker and iron hoop and is laid in around the position of camera medium cutting hole, the auxiliary radiation bar in the antenna for mobile phone is laid in the position near the ferromagnetic material in the mobile phone loudspeaker and iron hoop and the said primary radiation bar predetermined space of distance space;
(3) confirm to satisfy simultaneously the antenna pattern that antenna distribution area minimum and antenna radiation efficiency equal a minimum threshold through artificial debugging.
2. the method for raising handset antenna radiation efficiency as claimed in claim 1; It is characterized in that; In step (3) afterwards; Also comprise width, the width of auxiliary radiation bar and the space, interval between said two radiation items according to the required antenna performance adjustment primary radiation bar that reaches, thus the step of the antenna pattern after confirming to optimize.
3. like the method for aforementioned claim 1 or 2 described raising handset antenna radiation efficiencies, it is characterized in that, the primary radiation bar is laid in the crown center position of mobile phone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100033640A CN101009399B (en) | 2006-01-26 | 2006-01-26 | A method for improving the handset antenna radiation efficiency |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006100033640A CN101009399B (en) | 2006-01-26 | 2006-01-26 | A method for improving the handset antenna radiation efficiency |
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| CN101009399A CN101009399A (en) | 2007-08-01 |
| CN101009399B true CN101009399B (en) | 2012-01-04 |
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| CN2006100033640A Expired - Fee Related CN101009399B (en) | 2006-01-26 | 2006-01-26 | A method for improving the handset antenna radiation efficiency |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202616411U (en) * | 2012-04-23 | 2012-12-19 | 中兴通讯股份有限公司 | Mobile terminal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6577273B2 (en) * | 2000-02-23 | 2003-06-10 | Fujitsu Limited | Radio transceiver and method of controlling direction of radio-wave emission |
| CN2615673Y (en) * | 2003-04-10 | 2004-05-12 | 王孝凤 | Cell phone microwave radiation field measuring apparatus |
| CN1673758A (en) * | 2004-03-26 | 2005-09-28 | 明基电通股份有限公司 | Method and apparatus for detecting received radiation power |
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2006
- 2006-01-26 CN CN2006100033640A patent/CN101009399B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6577273B2 (en) * | 2000-02-23 | 2003-06-10 | Fujitsu Limited | Radio transceiver and method of controlling direction of radio-wave emission |
| CN2615673Y (en) * | 2003-04-10 | 2004-05-12 | 王孝凤 | Cell phone microwave radiation field measuring apparatus |
| CN1673758A (en) * | 2004-03-26 | 2005-09-28 | 明基电通股份有限公司 | Method and apparatus for detecting received radiation power |
Non-Patent Citations (1)
| Title |
|---|
| 罗德与施瓦茨.手机辐射功率和接收机特性测量技术.《电子质量》.2004,(第11期),第14－15页. * |
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| CN101009399A (en) | 2007-08-01 |
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