CN102098070A - Communication terminal capable of effectively reducing HAC/SAR of antenna - Google Patents
Communication terminal capable of effectively reducing HAC/SAR of antenna Download PDFInfo
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- CN102098070A CN102098070A CN2011100395765A CN201110039576A CN102098070A CN 102098070 A CN102098070 A CN 102098070A CN 2011100395765 A CN2011100395765 A CN 2011100395765A CN 201110039576 A CN201110039576 A CN 201110039576A CN 102098070 A CN102098070 A CN 102098070A
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- antenna
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- conductor sheet
- hac
- sar
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Abstract
The invention relates to a communication terminal capable of effectively reducing the hearing aid compatibility/specific absorption rate (HAC/SAR) of an antenna. The communication terminal comprises a printed circuit board (PCB) mainboard, an antenna bracket which is arranged on the PCB mainboard, and an antenna which is arranged on the antenna bracket, and also comprises at least one metal conductor piece; the metal conductor piece generates at least one resonance frequency point, and the resonance frequency point is positioned in an operating frequency range which can improve the HAC/SAR; a gap exists between the metal conductor piece and the PCB mainboard; the metal conductor piece is connected with the PCB mainboard through a connecting piece and then earthed; the metal conductor piece can be arranged at a position near an antenna feed point and also can be arranged at an adverse position near the antenna feed point; the metal conductor piece can be transversely arranged and also can be vertically arranged relative to the PCB mainboard; and the metal conductor piece and a mobile phone antenna are arranged on the same side of the antenna feed point. By arranging the metal conductor piece, current is concentrated on the metal conductor piece, so that the current on the PCB mainboard is weakened, the aim of reducing the HAC is fulfilled; and similarly, a value of the SAR also can be reduced.
Description
Technical field
The present invention relates to a kind of communication terminal, particularly a kind of communication terminal that can effectively reduce the HAC/SAR of antenna.
Background technology
Specific absorption rate SAR(Specific Absorption Rate) definition: 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.The meaning that SAR commonly used characterizes this physical process SAR in the biological dosimetry is the electromagnetic power that tissue absorbed or consumed of unit mass, unit is that the test of W/kg. 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.
When wireless device (Wireless devices) uses near hearing device (Hearing devices), hearing aids (Hearing aid) for example, the user may hear gurgle, drone or long noise.Some hearing devices can be exempted these interference than other, and different wireless devices also can produce different interference volumes.When numerical digit mobile phone and hearing aids operate at the same time, can generate an electromagnetic field near the antenna for mobile phone, the pulse energy in this magnetic field can be received by the microphone of hearing aids or communication coil and produce interference, transfers chirp the loud sound that the hearing aids user is heard to.To this, the standardisation bodies ANSI(American National Standards Institute of the U.S.) formulated the specification of ANSI C63.19, FCC requires mobile-phone manufacturers and cellular service merchant after 18 days February in 2008, and defeated U.S. product must have the product more than 50% to satisfy the regulation of ANSI C63.19 about hearing aids EMI restriction.
In the standard of ANSI C63.19 rules standard hearing aids compatibility (HAC, hearing aid compatibility) test, as follows:
Utilize test probe to measure the square electromagnetic field amount of 5X5cm of mobile phone sender top 15mm;
To test plane area and be divided into 9 blocks, each block is got maximum electromagnetic field intensity;
By the grade of removing to define HAC in 9 intervals with the electromagnetic field intensity of maximum;
HAC is with 5dB value difference definition different brackets, is respectively M1, M2, M3, M4 etc. (and wherein M3 and M4 meet rules).
So for antenna, generally we get the HAC value that the poorest grade removes to define this Frequency point again at the HAC grade that can observe electric field and magnetic field simultaneously.
All mobile phones that enter North America market must satisfy the requirement of HAC and SAR, but for existing mobile phone, HAC and SAR are that the HAC of difficult point, especially a high frequency (PCS frequency range) has more challenge; Rationally reduce the value of SAR and HAC, become the problem that must solve.
Disclosing notification number in China Intellectual Property Office is that CN 101540430A, denomination of invention are to improve the Chinese patent application of the method for antenna and hearing aids compatibility (HAC) characteristic, it mainly is that metal framework is set around the antenna ground face, change the directivity of this aerial radiation by this, to increase antenna directivity away from the hearing aids direction, reduce energy toward the radiation of hearing aids direction, improve the electric field near field amount on hearing aids compatibility test plane, about 3dB.Advancing, can further increase the height of this metal framework, to reduce the electric field near field amount on this hearing aids compatibility test plane.
Above-mentioned patent mainly is in order to reduce the intensity of antenna measurement plane electric fields, not have rational and effective and solve the problem that reduces SAR and HAC.
Summary of the invention
The object of the present invention is to provide a kind of communication terminal that can effectively reduce the HAC/SAR of antenna, solved the technical problem that can't effectively reduce HAC/SAR in the prior art.
A kind of communication terminal that can effectively reduce the HAC/SAR of antenna, comprise the PCB mainboard, be arranged on the antenna holder on the PCB mainboard and be arranged at antenna on the antenna holder, also comprise at least one metallic conductor sheet, described metallic conductor sheet produces at least one resonance frequency, described resonance frequency is positioned at the working frequency range that can improve HAC/SAR, have the space between described metallic conductor sheet and the PCB mainboard, described metallic conductor sheet is by ground connection behind the connector connection PCB mainboard.
Preferably, described metallic conductor sheet is of a size of 1/4th these resonance wavelengths.
Preferably, the tie point that connector is connected with the PCB mainboard is arranged on the same side of antenna feed point, is arranged on the position near antenna feed point, and satisfies | d
1-d
2| 1/4 resonance wavelength, | d
1-d
2| be the distance of tie point and antenna feed point.
Preferably, the tie point that connector is connected with the PCB mainboard is arranged on the same side of antenna feed point, is arranged near the opposite position of antenna feed point, and satisfies | d
1-d
3| 1/4 resonance wavelength, | d
1-d
3| be the distance of tie point and antenna feed point opposite location.
Preferably, described metallic conductor sheet is with respect to horizontal placement of PCB mainboard or vertical the placement.
Preferably, described metallic conductor sheet comprises the first metallic conductor sheet and the second metallic conductor sheet, the first metallic conductor sheet and the second metallic conductor sheet all are arranged on the same side of antenna feed point, and the first metallic conductor sheet is arranged on the position near antenna feed point, and the second metallic conductor sheet is arranged on and the antenna feed point opposite location.
Preferably, described metallic conductor sheet is arranged on the back of communication terminal.
Preferably, described metallic conductor sheet is arranged on the inner surface or outer surface of back cover.
Preferably, described metallic conductor sheet is arranged on the PCB mainboard by support.
Preferably, described metallic conductor sheet that direction is set is parallel with the PCB mainboard.
Preferably, the connector between metallic conductor sheet and the PCB mainboard can be positioned at the edge of metallic conductor sheet, also can be the centre position.
Compared with prior art, there is following technique effect in the present invention:
The present invention will concentrate on electric current on the metallic conductor sheet by increasing the metallic conductor sheet mode in parallel with the PCB mainboard, thereby cause the current decay on the PCB mainboard, to reach the purpose that reduces HAC.In like manner, also can reduce the numerical value of SAR.
Description of drawings
Fig. 1 is the structural representation of the communication terminal of a kind of HAC/SAR that can effectively reduce antenna of the present invention;
Fig. 2 is the syndeton schematic diagram of metallic conductor sheet in the communication terminal of a kind of HAC/SAR that can effectively reduce antenna of the present invention;
Fig. 3 is the structural representation of a plurality of metallic conductor sheets in the communication terminal of a kind of HAC/SAR that can effectively reduce antenna of the present invention;
Fig. 4 is the S11 figure that does not add the metallic conductor sheet;
Fig. 5 is the S11 figure that has added the metallic conductor sheet;
Fig. 6 is the comparison diagram of mobile phone antenna performance.
Embodiment
Below in conjunction with accompanying drawing, further detailed narration is done in invention to this reality.
Embodiment one
Please refer to Fig. 1, a kind of communication terminal that can effectively reduce the HAC/SAR of antenna of the present invention, comprise PCB mainboard 1, be arranged on the antenna holder 4 on the PCB mainboard 1 and be arranged at antenna for mobile phone 5 on the antenna holder 4, also comprise a metallic conductor sheet 2, metallic conductor sheet 2 produces at least one resonance frequency, the resonance frequency is positioned at the working frequency range that can improve HAC/SAR, in the present embodiment, the working frequency range scope at 1850MHz between the 1910MHz.Have the space between metallic conductor sheet 2 and the PCB mainboard 1, metallic conductor sheet 2 is connected back ground connection on the PCB mainboard 1 by a connection piece.The direction that is provided with of metallic conductor sheet 2 can be parallel with PCB mainboard 1, also certain angle can be arranged, for example metallic conductor sheet 2 that direction is set is vertical with PCB mainboard 1, as long as the resonance frequency that metallic conductor sheet 2 is produced is positioned at the working frequency range that can improve HAC/SAR.In the present embodiment, metallic conductor sheet 2 that direction is set is parallel with PCB mainboard 1.
In the present embodiment, metallic conductor sheet 2 connects by shell fragment 3, in fact, can also connect by other connector, as long as this connector has conduction conducting effect.In the present invention, the position of shell fragment 3 can be arranged on the edge of metallic conductor sheet 2, also can be arranged on the centre of metallic conductor sheet 2, as long as the resonance frequency that metallic conductor sheet 2 is produced is positioned at the working frequency range that can improve HAC/SAR.
The resonance frequency that metallic conductor sheet 2 produces requires to be positioned at the working frequency range that can improve HAC/SAR, so the size of metallic conductor sheet 2 will satisfy the requirement that produces above-mentioned resonance frequency, promptly metallic conductor sheet 2 is of a size of 1/4th these resonance wavelengths.
Please refer to shown in Fig. 2 b, the tie point that connector and PCB mainboard 1 connects is arranged near the opposite position of antenna feed point 51, and satisfies | d
1-d
3| 1/4 resonance wavelength, | d
1-d
3| be the distance of tie point and antenna feed point 51 opposite location.
How metallic conductor sheet 2 specifically is provided with, and a variety of implementations are arranged.The mode that a kind of mode is a metallic conductor sheet 2 by support is arranged on the PCB mainboard 1, and another kind of mode is inner surface or the outer surface that metallic conductor sheet 2 is provided with the communication terminal back cover.
The material of metallic conductor sheet 2 can be a copper sheet, also can stainless steel or other have the metal of conducting function, and material can be soft board, also can be hardboard.
That is to say, have the space between metallic conductor sheet 2 and the PCB mainboard 1, Yi Bian be not contacted at least, both connections are to connect by a shell fragment 3.
Embodiment two
Please refer to Fig. 3, a kind of communication terminal that can effectively reduce the HAC/SAR of antenna of the present invention, comprise PCB mainboard 1, be arranged on the antenna holder 4 on the PCB mainboard 1 and be arranged at antenna for mobile phone 5 on the antenna holder 4, also comprise the first metallic conductor sheet 21 and the second metallic conductor sheet 22, the first metallic conductor sheet 21 and the second metallic conductor sheet 22 produce at least one resonance frequency, the resonance frequency is positioned at the working frequency range that can improve HAC/SAR, in the present embodiment, the working frequency range scope at 1850MHz between the 1910MHz.Have the space between the first metallic conductor sheet 21 and the second metallic conductor sheet 22 and the PCB mainboard 1, the first metallic conductor sheet 21 and the second metallic conductor sheet 22 are connected back ground connection on the PCB mainboard 1 by a connection piece.The direction that is provided with of the first metallic conductor sheet 21 and the second metallic conductor sheet 22 can be parallel with PCB mainboard 1, also certain angle can be arranged, for example the first metallic conductor sheet 21 and the second metallic conductor sheet 22 that direction is set is vertical with PCB mainboard 1, as long as the resonance frequency that the first metallic conductor sheet 21 and the second metallic conductor sheet 22 are produced is positioned at the working frequency range that can improve HAC/SAR.In the present embodiment, the first metallic conductor sheet 21 and the second metallic conductor sheet 22 that direction is set is parallel with PCB mainboard 1.
In the present embodiment, the first metallic conductor sheet 21 connects by shell fragment 31, and the second metallic conductor sheet 22 connects by shell fragment 32.In fact, can also connect, as long as those connectors have conduction conducting effect by other connector.In the present invention, the position of shell fragment 31 and shell fragment 32 can be arranged on the edge of the first metallic conductor sheet 21 and the second metallic conductor sheet 22, also can be arranged on the centre of the first metallic conductor sheet 21 and the second metallic conductor sheet 22, as long as the resonance frequency that the first metallic conductor sheet 21 and the second metallic conductor sheet 22 are produced is positioned at the working frequency range that can improve HAC/SAR.
The resonance frequency that the first metallic conductor sheet 21 and the second metallic conductor sheet 22 produce requires to be positioned at the working frequency range that can improve HAC/SAR, so the size of the first metallic conductor sheet 21 and the second metallic conductor sheet 22 will satisfy the requirement that produces above-mentioned resonance frequency, promptly metallic conductor sheet 2 is of a size of 1/4th these resonance wavelengths.
The first metallic conductor sheet 21 and the second metallic conductor sheet 22 preferably are arranged on the same side of antenna 51 feedback point, and, please refer to shown in Figure 3ly, the tie point that shell fragment 32 is connected with PCB mainboard 1 is arranged on the position of close antenna feed point 51, and is preferably satisfied | d
1-d
2| 1/4 resonance wavelength, | d
1-d
2| be the distance of tie point and antenna feed point 51;
Please refer to shown in Figure 3ly, the tie point that shell fragment 31 and PCB mainboard 1 connects is arranged near the opposite position of antenna feed point 51, and satisfies | d
1-d
3| 1/4 resonance wavelength, | d
1-d
3| be the distance of tie point and antenna feed point 51 opposite location.
How the first metallic conductor sheet 21 and the second metallic conductor sheet 22 specifically are provided with, and a variety of implementations are arranged.The mode that a kind of mode is the first metallic conductor sheet 21 and the second metallic conductor sheet 22 by support is arranged on the PCB mainboard 1, and another kind of mode is inner surface or the outer surface that the first metallic conductor sheet 21 and the second metallic conductor sheet 22 are provided with the communication terminal back cover.
The material of the first metallic conductor sheet 21 and the second metallic conductor sheet 22 can be a copper sheet, also can stainless steel or other have the metal of conducting function, and material can be soft board, also can be hardboard.
That is to say, have the space between the first metallic conductor sheet 21 and the second metallic conductor sheet 22 and the PCB mainboard 1, Yi Bian promptly be not contacted at least.
The present invention proposes is to increase one or more pieces metallic conductor sheets 2 on the direction parallel with PCB mainboard 1, and be connected with PCB mainboard 1 by shell fragment 3, metallic conductor sheet 2 can effectively produce the 3rd (or a plurality of) resonance frequency (in the present embodiment, the length of metallic conductor sheet 2 is near 1/4th resonance wavelength), and one of them resonance point that allows the 3rd (or a plurality of) resonance point itself be produced near antenna for mobile phone 5.As shown in Figure 4, under the situation that does not have metal cutter hub sheet 2, most electric currents will itself reach on the PCB mainboard 1 at antenna for mobile phone 5.As shown in Figure 5, by increasing metallic conductor sheet 2, electric current will concentrate on the metallic conductor sheet 2, thereby cause the current decay on the PCB mainboard 1, to reach the purpose that reduces HAC.In like manner, also can reduce the numerical value of SAR.
If metallic conductor sheet 2 itself is placed on the back side of mobile phone shell, in view of one part of current can focus on the metallic conductor sheet 2 from mainboard before, cause the current decay with the contacted one side of headform, effectively reduced the influence of headform antenna for mobile phone 5.
In Fig. 6, can be clearly seen that the E/H field intensity of high frequency is effectively reduced by increasing metallic conductor sheet 2, SAR from before 0.7 be reduced to 0.5, antenna for mobile phone 5 performances itself do not have much variations simultaneously, and the performance of antenna for mobile phone 5 numbers of people also obtains certain raising.
More than disclosed only be the application's a specific embodiment, but the application is not limited thereto, any those skilled in the art can think variation, all should drop in the application's the protection range.
Claims (11)
1. communication terminal that can effectively reduce the HAC/SAR of antenna, comprise the PCB mainboard, be arranged on the antenna holder on the PCB mainboard and be arranged at antenna on the antenna holder, it is characterized in that, also comprise at least one metallic conductor sheet, described metallic conductor sheet produces at least one resonance frequency, described resonance frequency is positioned at the working frequency range that can improve HAC/SAR, has the space between described metallic conductor sheet and the PCB mainboard, and described metallic conductor sheet is by ground connection behind the connector connection PCB mainboard.
2. a kind of communication terminal that can effectively reduce the HAC/SAR of antenna as claimed in claim 1 is characterized in that described metallic conductor sheet is of a size of 1/4th these resonance wavelengths.
3. a kind of communication terminal that can effectively reduce the HAC/SAR of antenna as claimed in claim 1 is characterized in that the tie point that connector is connected with the PCB mainboard is arranged on the same side of antenna feed point, is arranged on the position near antenna feed point, and satisfies | d
1-d
2| 1/4 resonance wavelength, | d
1-d
2| be the distance of tie point and antenna feed point.
4. a kind of communication terminal that can effectively reduce the HAC/SAR of antenna as claimed in claim 1 is characterized in that the tie point that connector is connected with the PCB mainboard is arranged on the same side of antenna feed point, is arranged near the opposite position of antenna feed point, and satisfies | d
1-d
3| 1/4 resonance wavelength, | d
1-d
3| be the distance of tie point and antenna feed point opposite location.
5. a kind of communication terminal that can effectively reduce the HAC/SAR of antenna as claimed in claim 1 is characterized in that, described metallic conductor sheet is with respect to horizontal placement of PCB mainboard or vertical the placement.
6. a kind of communication terminal that can effectively reduce the HAC/SAR of antenna as claimed in claim 1, it is characterized in that, described metallic conductor sheet comprises the first metallic conductor sheet and the second metallic conductor sheet, the first metallic conductor sheet and the second metallic conductor sheet all are arranged on the same side of antenna feed point, and the first metallic conductor sheet is arranged on the position near antenna feed point, and the second metallic conductor sheet is arranged on and the antenna feed point opposite location.
7. a kind of communication terminal that can effectively reduce the HAC/SAR of antenna as claimed in claim 1 is characterized in that described metallic conductor sheet is arranged on the back of communication terminal.
8. a kind of communication terminal that can effectively reduce the HAC/SAR of antenna as claimed in claim 7 is characterized in that described metallic conductor sheet is arranged on the inner surface or outer surface of back cover.
9. a kind of communication terminal that can effectively reduce the HAC/SAR of antenna as claimed in claim 8 is characterized in that described metallic conductor sheet is arranged on the PCB mainboard by support.
10. a kind of communication terminal that can effectively reduce the HAC/SAR of antenna as claimed in claim 1 is characterized in that, described metallic conductor sheet that direction is set is parallel with the PCB mainboard.
11. a kind of communication terminal that can effectively reduce the HAC/SAR of antenna as claimed in claim 1 is characterized in that the connector between metallic conductor sheet and the PCB mainboard can be positioned at the edge of metallic conductor sheet, also can be the centre position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100395765A CN102098070A (en) | 2011-02-17 | 2011-02-17 | Communication terminal capable of effectively reducing HAC/SAR of antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100395765A CN102098070A (en) | 2011-02-17 | 2011-02-17 | Communication terminal capable of effectively reducing HAC/SAR of antenna |
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| Publication Number | Publication Date |
|---|---|
| CN102098070A true CN102098070A (en) | 2011-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100395765A Pending CN102098070A (en) | 2011-02-17 | 2011-02-17 | Communication terminal capable of effectively reducing HAC/SAR of antenna |
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| CN (1) | CN102098070A (en) |
Cited By (10)
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| CN102595296A (en) * | 2012-01-31 | 2012-07-18 | 惠州Tcl移动通信有限公司 | Hearing aid compatible device and hearing aid compatible mobile terminal |
| WO2012152103A1 (en) * | 2011-10-18 | 2012-11-15 | 中兴通讯股份有限公司 | Wireless terminal |
| WO2013097458A1 (en) * | 2011-12-27 | 2013-07-04 | 中兴通讯股份有限公司 | Motherboard structure and wireless terminal |
| US8604996B2 (en) | 2011-08-31 | 2013-12-10 | Huawei Device Co., Ltd. | Wireless terminal |
| CN103872427A (en) * | 2012-12-18 | 2014-06-18 | 耀登科技股份有限公司 | Antenna structure |
| CN104639691A (en) * | 2015-02-16 | 2015-05-20 | 苏州国质信网络通讯有限公司 | Method for reducing SAR (specific absorption rate) of metal frame antenna of mobile communication terminal |
| CN106814953A (en) * | 2016-12-30 | 2017-06-09 | 青岛海信移动通信技术股份有限公司 | Mobile terminal |
| CN107682475A (en) * | 2017-08-14 | 2018-02-09 | 深圳天珑无线科技有限公司 | Mobile terminal and its housing |
| CN108400430A (en) * | 2018-02-06 | 2018-08-14 | 中兴通讯股份有限公司 | A kind of antenna assembly and terminal |
| CN113328250A (en) * | 2021-05-27 | 2021-08-31 | 维沃移动通信有限公司 | Electronic device |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8604996B2 (en) | 2011-08-31 | 2013-12-10 | Huawei Device Co., Ltd. | Wireless terminal |
| WO2012152103A1 (en) * | 2011-10-18 | 2012-11-15 | 中兴通讯股份有限公司 | Wireless terminal |
| WO2013097458A1 (en) * | 2011-12-27 | 2013-07-04 | 中兴通讯股份有限公司 | Motherboard structure and wireless terminal |
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| CN103872427B (en) * | 2012-12-18 | 2016-05-18 | 耀登科技股份有限公司 | Antenna structure |
| CN104639691A (en) * | 2015-02-16 | 2015-05-20 | 苏州国质信网络通讯有限公司 | Method for reducing SAR (specific absorption rate) of metal frame antenna of mobile communication terminal |
| CN106814953A (en) * | 2016-12-30 | 2017-06-09 | 青岛海信移动通信技术股份有限公司 | Mobile terminal |
| CN106814953B (en) * | 2016-12-30 | 2020-05-05 | 青岛海信移动通信技术股份有限公司 | Mobile terminal |
| CN107682475A (en) * | 2017-08-14 | 2018-02-09 | 深圳天珑无线科技有限公司 | Mobile terminal and its housing |
| CN108400430A (en) * | 2018-02-06 | 2018-08-14 | 中兴通讯股份有限公司 | A kind of antenna assembly and terminal |
| CN113328250A (en) * | 2021-05-27 | 2021-08-31 | 维沃移动通信有限公司 | Electronic device |
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