WO2012058878A1 - 一种移动终端及降低其电磁波能量吸收比的方法 - Google Patents

一种移动终端及降低其电磁波能量吸收比的方法 Download PDF

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Publication number
WO2012058878A1
WO2012058878A1 PCT/CN2011/070898 CN2011070898W WO2012058878A1 WO 2012058878 A1 WO2012058878 A1 WO 2012058878A1 CN 2011070898 W CN2011070898 W CN 2011070898W WO 2012058878 A1 WO2012058878 A1 WO 2012058878A1
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Prior art keywords
mobile terminal
absorbing material
antenna
fpc
lcd
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PCT/CN2011/070898
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English (en)
French (fr)
Inventor
刘锋昱
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中兴通讯股份有限公司
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Publication of WO2012058878A1 publication Critical patent/WO2012058878A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3827—Portable transceivers
    • H04B1/3833—Hand-held transceivers
    • H04B1/3838—Arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use

Definitions

  • the present invention relates to the field of mobile terminals, and in particular, to a mobile terminal and a method for reducing the electromagnetic energy absorption ratio (SAR) of the electromagnetic wave.
  • SAR electromagnetic energy absorption ratio
  • the SAR is generally used as a numerical value indicating the degree of harmfulness to the human body caused by electromagnetic waves radiated from the mobile terminal.
  • SAR is the electric power absorbed per unit mass of the human body unit, and the unit of measurement is W/Kg.
  • a human body phantom device is used to measure human SAR, which has an electrical constant similar to that of human tissue.
  • SAR is represented by the following formula: where ⁇ is a person
  • the conductivity of the bulk model which is the density of the human body model, is the peak of the local electric field vector.
  • the SAR in human tissue is proportional to the square of the electric field strength in the tissue, and is derived from the parameters of the incident electromagnetic field (eg, frequency, intensity, direction, and source of the electromagnetic field), the relative position of the target, and the typical tissue of the exposed human body (
  • the characteristic characteristics of the tissue are determined by the genetic characteristics, ground effects, and environmental effects of exposure.
  • EMI Electromagnetic Interference
  • the main object of the present invention is to provide a mobile terminal and a method for reducing the SAR thereof, which can effectively reduce the SAR of the mobile terminal.
  • a mobile terminal comprising a liquid crystal display LCD, a main board, and an antenna, wherein the mobile terminal further comprises: a absorbing material located on the flexible circuit board FPC of the LCD for absorbing electromagnetic wave energy radiated by the antenna.
  • the antenna is a monopole antenna, or an IFA antenna.
  • the absorbing material is specifically configured to absorb energy of an electromagnetic wave having a frequency of 1 GHz or more, and the position of the absorbing material is an FPC region having a distance of 10 mm from the antenna; and a back surface of the FPC region is a reference ground of the main board.
  • the left and right boundaries of the wave material do not exceed the left and right boundaries of the LCD, respectively, and the lower boundary of the absorbing material does not exceed the lower boundary of the LCD.
  • the determining that the absorbing material is disposed on the FPC of the LCD in the mobile terminal is: determining that the position of the absorbing material on the mobile terminal is an FPC area with a distance of 10 mm from the antenna, and the back side of the FPC area is The reference ground of the mobile terminal board.
  • attaching the absorbing material to the FPC is: attaching the absorbing material to the left and right boundaries of the material not to exceed the left boundary and the boundary of the LCD, respectively, and the lower boundary of the absorbing material is not Exceed the lower boundary of the LCD.
  • the method of the invention increases the SAR value of the mobile terminal by reducing the SAR value of the mobile terminal without reducing the Radiation Power (TRP) of the mobile terminal, so that the mobile terminal is not affected. Under the premise of the call quality and shape, the impact of the mobile terminal on human radiation is reduced, and it is easier to implement.
  • TRP Radiation Power
  • FIG. 1 is a schematic structural diagram of a mobile terminal according to the present invention.
  • FIG. 2 is a schematic view showing the shape of a wave absorbing material of the present invention
  • FIG. 3 is a graph showing the performance of electromagnetic wave absorption of the absorbing material used in the present invention.
  • FIG. 4 is a schematic flow chart of a method for reducing a SAR of a mobile terminal according to the present invention. detailed description
  • the basic idea of the present invention is: attaching a absorbing material to a flexible printed circuit (FCC) located on a liquid crystal display (LCD) of a mobile terminal for absorbing electromagnetic wave energy radiated by the antenna.
  • FCC flexible printed circuit
  • LCD liquid crystal display
  • the mobile terminal includes an LCD, a main board 34, and an antenna 33.
  • the LCD includes a display area 31 of the LCD and an FPC 32 located below the LCD display area 31.
  • the absorbing material is located on the FPC 32 for absorbing the electromagnetic wave energy radiated by the antenna 33.
  • the antenna 33 is a device for transmitting and receiving electromagnetic waves.
  • the antenna 33 can be designed as a built-in antenna in consideration of the design of the mobile terminal and the user's use. In the embodiment of the present invention, the antenna 33 is determined according to the radiation performance and the spatial arrangement. As a monopole antenna, or an IFA antenna, at this time, the reference ground on the main board 34 located at the back of the antenna 33 area needs to be dug out to become a clearance; the antenna 33 may be formed on the rear cover of the antenna bracket or the mobile terminal.
  • the antenna 33 When the antenna 33 is formed on the antenna holder, it is specifically attached to the antenna holder and located on the back surface of the antenna holder, and the absorbing material is attached to the upper surface of the FPC 32, and the back surface of the FPC 32 is the reference ground of the main board 34.
  • the position of the antenna 33 and the absorbing material are spatially separated, wherein the distance between the absorbing material and the antenna 33 is too close, which may affect the electromagnetic wave emission of the antenna 33 and affect the call quality; If the distance between the absorbing material and the antenna 33 is too far, the effect of the absorbing material absorbing the electromagnetic wave emitted by the antenna 33 is affected; Therefore, the preferred distance between the absorbing material and the antenna 33 is 10 mm, which not only reduces the effect of the mobile terminal SAR, but also ensures that the TRP of the mobile terminal is not affected.
  • Table 1 shows the electromagnetic wave for the 1900MHz frequency band of WCDMA.
  • the comparison table is obtained after measuring the mobile terminal after the absorbing material and after absorbing the absorbing material:
  • Table 1 It can be seen from Table 1 that for the same mobile terminal, the average SAR of the volume of the lg mannequin tissue is 1.7 W/kg before the absorbing material is attached. When the mobile terminal is affixed with the absorbing material, the lg body The average SAR in the volume of the model tissue was reduced to 1.2 W/kg, and the value of TRP was not affected by the absorbing material.
  • the mobile terminal in the present invention may be a mobile phone, a personal digital assistant, or the like.
  • the absorbing material will be further described below in conjunction with Figs. 2 and 3.
  • the shape of the absorbing material 41 substantially matches the shape of the FPC 32 in FIG. 1, specifically, the absorbing material 41.
  • the upper boundary does not exceed the lower boundary of the LCD display region 31, the left boundary of the absorbing material 41 does not exceed the left boundary of the LCD, the right boundary of the absorbing material 41 does not exceed the right boundary of the LCD, and the lower boundary of the absorbing material 41 does not exceed the LCD.
  • the lower boundary does not exceed the LCD display region 31
  • the left boundary of the absorbing material 41 does not exceed the left boundary of the LCD
  • the right boundary of the absorbing material 41 does not exceed the right boundary of the LCD
  • the lower boundary of the absorbing material 41 does not exceed the LCD.
  • the lower boundary is a view showing the shape of the absorbing material in the embodiment of the present invention.
  • Fig. 3 is a graph showing the performance of the absorbing material of the present invention for absorbing electromagnetic waves.
  • the four curves in Fig. 3 are obtained by randomly measuring four times of the same absorbing material, and the horizontal line in Fig. 3
  • the coordinates represent the frequency of the electromagnetic wave, and the ordinate represents the energy loss of the electromagnetic wave, that is, the electromagnetic wave energy absorbed by the absorbing material.
  • the absorbing material of the present invention mainly absorbs energy of electromagnetic waves having a frequency of 1 GHz (1000 MHz) or more. Therefore, in combination with the performance curve of FIG.
  • the mobile terminal in the embodiment of the present invention has obvious absorption for the SAR of the high frequency band WCDMA1900/2100 and the SAR of GSM1800/1900, and
  • the TRPs of the seven bands GSM850/900/1800/1900 and WCDMA850/1900/2100 have no effect, and the purpose of selectively reducing the SAR of the mobile terminal under the premise of ensuring the quality of the call is realized.
  • FIG. 4 is a flow chart showing a method of reducing the electromagnetic wave energy absorption ratio of a mobile terminal according to the present invention. As shown in FIG. 4, the method includes the following steps:
  • Step 401 Determine a position of the absorbing material on the mobile terminal
  • the position of the absorbing material on the mobile terminal is determined as an FPC of the LCD, wherein
  • the LCD of the mobile terminal includes a display area of the LCD and an FPC located under the LCD display area, and the absorbing material is attached to the upper surface of the FPC, and the back of the FPC is the reference ground of the mobile terminal board; in the embodiment of the present invention, according to the radiation performance
  • the spatial arrangement determines that the antenna of the mobile terminal is a monopole antenna or an IFA antenna.
  • the reference ground on the main board located at the back of the antenna area needs to be dug out to become a clearance; the antenna may be formed on the antenna bracket or moved.
  • the antenna is formed on the antenna support, it is specifically attached to the antenna support and located at the back of the antenna support. Therefore, in the embodiment of the present invention, the position of the antenna and the absorbing material is spatially Separated.
  • the antenna will affect the electromagnetic wave emission and affect the quality of the call; if the distance between the absorbing material and the antenna is too far, the effect of the absorbing material absorbing the electromagnetic wave emitted by the antenna will be affected; Therefore, the position of the absorbing material is an FPC area with a distance of 10 mm from the antenna, and the back side of the FPC area is the reference ground of the mobile terminal board, and the effect of not only reducing the SAR of the mobile terminal is most obvious, but also ensuring The TRP of the mobile terminal is not affected.
  • Step 402 attaching the absorbing material to the position for absorbing electromagnetic wave energy emitted by the antenna of the mobile terminal.
  • the absorbing material is attached to the FPC, and the upper boundary of the absorbing material does not exceed the lower boundary of the LCD display region, and the left and right boundaries of the absorbing material do not exceed the left boundary of the LCD and have At the boundary, the lower boundary of the absorbing material does not exceed the lower boundary of the LCD.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Description

一种移动终端及降低其电磁波能量吸收比的方法 技术领域
本发明涉及移动终端领域， 尤其涉及一种移动终端及降低其电磁波能 量吸^：比 （Specific Absorption Rate , SAR ) 的方法。 背景技术
由于无线通信技术快速地发展， 移动终端已经变得非常普及， 而且， 移动终端的平均使用时间也迅速地增加。 因此， 移动终端辐射出的电磁波 是否对人体具有有害的影响也得到了越来越多的关注。
SAR通常用作指示由移动终端辐射出的电磁波引起的对人体有害程度 的数值， SAR是人体单元每单位质量吸收的电功率， 测量的单位为 W/Kg。 实际应用中， 由于很难直接对人体进行测量， 所以使用人体模型 （human body phantom ) 的装置进行人体 SAR的测量， 所述人体模型具有类似于人 体组织的电常数。 SAR由下面的公式表示： 其中， σ是人
Figure imgf000003_0001
体模型的电导率， ?是人体模型的密度， 是局域电场矢量的峰值。
人体组织中的 SAR与该组织中的电场强度的平方成正比， 并且由入射 的电磁场的参数（例如频率、 强度、 方向和电磁场的源）、 目标物的相对位 置、 暴露的人体的典型组织（ characteristic tissue )的遗传特性、 地面影响以 及暴露的环境影响来确定。
目前， 多个国家已经基于 SAR建立并规范了关于人体暴露于电磁波的 安全标准， 为了满足 SAR标准， 在制造移动终端时会使用各种降低 SAR 的方法。
通常情况， 通过降低移动终端的发射功率来降低 SAR的值， 但这种方 法会在一定程度上影响移动终端的通信质量。 还有一种方法是在移动终端 的壳体上涂上电磁干扰 ( Electro Magnetic Interference, EMI )涂料， EMI 涂料通过使金属体封闭的弯曲表面的相对侧电磁地分开而提供电磁屏蔽效 应； 当 EMI涂料被涂在移动终端壳体上时， 在壳体中产生的电磁波不会从 移动终端辐射出去； 它还可以防止静电和起电的产生。 虽然这种方法对移 动终端的电磁敏感度 ( Electro Magnetic Susceptibility, EMS )和 EMI具有 影响， 但是不能从根本上减少天线辐射的电磁波的影响。 此外， 理论上， 当 EMI涂料被涂在移动终端上时，通过由于 EMI涂料而产生的再次反射会 增加人体的 SAR。 另一种方法是， 考虑到 SAR的影响， 而在移动终端内重 新布置各种部件， 但是为了减少 SAR在移动终端内部重新布置各种部件， 也会对移动终端的通信质量和 /或外形产生不好的影响。 发明内容
有鉴于此， 本发明的主要目的在于提供一种移动终端及降低其 SAR的 方法， 能实现移动终端 SAR的有效降低。
为达到上述目的， 本发明的技术方案是这样实现的：
一种移动终端， 包括液晶显示屏 LCD、 主板、 天线， 其特征在于， 所 述移动终端还包括： 吸波材料， 位于 LCD的柔性电路板 FPC上， 用于吸收 所述天线放射的电磁波能量。
进一步地， 所述天线为单极子天线、 或 IFA天线。
进一步地， 所述吸波材料具体用于吸收频率为 1GHz 以上电磁波的能 量， 且吸波材料的位置为与天线距离为 10mm的 FPC区域； 所述 FPC区域 的背面为所述主板的参考地。 波材料的左边界和右边界分别不超过 LCD的左边界和右边界， 吸波材料的 下边界不超过 LCD的下边界。 一种降低移动终端电磁波能量吸收比的方法， 所述方法包括： 确定将吸波材料设置于移动终端中 LCD的柔性电路板 FPC上； 将所述吸波材料贴于所述 FPC上， 吸收所述移动终端的天线放射的电 磁波能量。
进一步地， 所述确定将吸波材料设置于移动终端中 LCD的 FPC上为： 确定吸波材料在移动终端上的位置为与天线距离为 10mm的 FPC区域， 且 所述 FPC区域的背面为所述移动终端主板的参考地。
进一步地， 将所述吸波材料贴于所述 FPC上为： 将所述吸波材料贴于 料的左边界和右边界分别不超过 LCD的左边界和有边界， 吸波材料的下边 界不超过 LCD的下边界。
本发明通过在移动终端的特定位置增加吸波材料的方法， 既降低了移 动终端的 SAR值， 又不降低移动终端的辐射功率 （ Total Radiated Power, TRP ), 如此， 能达到在不影响移动终端通话质量及外形的前提下， 降低移 动终端对人体辐射的影响， 同时较易实现。 附图说明
图 1为本发明移动终端的结构示意图；
图 2为本发明吸波材料的形状示意图；
图 3为本发明使用的吸波材料吸收电磁波的性能曲线图；
图 4为本发明降低移动终端 SAR的方法的流程示意图。 具体实施方式
本发明的基本思想为： 将吸波材料贴于位于移动终端液晶显示屏 ( Liquid Crystal Display, LCD )的柔性电路板（ Flexible Printed Circuit, FPC ) 上， 用于吸收所述天线放射的电磁波能量。 为使本发明的目的、 技术方案和优点更加清楚明白， 以下举实施例并 参照附图， 对本发明进一步详细说明。
图 1示出了本发明移动终端的结构示意， 参照图 1 , 所述移动终端包括 LCD,主板 34、天线 33;其中， LCD包括 LCD的显示区域 31和位于 LCD 显示区域 31下方的 FPC 32, 吸波材料位于 FPC 32上， 用于吸收所述天线 33放射的电磁波能量。
其中， 天线 33是为了用于发送和接收电磁波的装置， 考虑到移动终端 的设计和用户的使用便捷，天线 33可以设计成内置天线，本发明实施例中， 根据辐射性能和空间布置确定天线 33为单极子天线、 或 IFA天线， 此时， 需要将位于天线 33 区域背面的主板 34上的参考地挖掉， 变为净空； 所述 天线 33可以形成在天线支架或移动终端的后壳上， 当天线 33形成于天线 支架上时， 具体为贴在天线支架上、 且位于天线支架的背面， 而吸波材料 是贴于 FPC 32的上表面， FPC 32的背面为主板 34的参考地， 因此， 本发 明实施例中， 天线 33与吸波材料所在位置是在空间上隔开的， 其中， 吸波 材料与天线 33的距离过近， 会影响天线 33进行电磁波的发射， 影响通话 质量； 吸波材料与天线 33的距离过远， 则吸波材料吸收天线 33所发射电 磁波的效果会受到影响； 故此， 所述吸波材料与天线 33 的优选距离为 10mm, 此时不仅降低移动终端 SAR 的效果最为明显， 还能同时保证移动 终端的 TRP不受影响。
表 1为对于 WCDMA的 1900MHz频段的电磁波， 针对 SAR和 TRP, 对贴吸波材料前和贴吸波材料后的移动终端进行测量得到的对照表：
Figure imgf000006_0001
表 1 由表 1 可以看出， 对于同一个移动终端， 在其贴有吸波材料之前， lg 人体模型组织的体积中平均的 SAR为 1.7W/kg, 当移动终端贴上吸波材料 之后， lg人体模型组织的体积中平均的 SAR降为 1.2W/kg, 而 TRP的值并 没有受到是否贴有该吸波材料的影响。
应当理解， 本发明中的移动终端可以为移动电话、 个人数字助理等。 下面结合图 2和图 3来对吸波材料进行进一步地说明。
图 2示出了本发明实施例中吸波材料的形状示意， 结合图 1 , 所述吸波 材料 41的形状基本上与图 1中 FPC 32的形状相匹配， 具体地， 吸波材料 41的上边界不超过 LCD显示区域 31的下边界，吸波材料 41的左边界不超 过 LCD的左边界， 吸波材料 41的右边界不超过 LCD的右边界， 吸波材料 41的下边界不超过 LCD的下边界。
图 3示出了本发明吸波材料吸收电磁波的性能曲线， 如图 3所示， 图 3 中的四条曲线为对同一吸波材料随机进行的四次测量所得到的曲线， 图 3 中的横坐标代表电磁波的频率， 纵坐标代表电磁波的能量损失， 即吸波材 料所吸收的电磁波能量。 由图 3 可以看出， 本发明的吸波材料主要吸收频 率为 1GHz ( 1000MHz )以上电磁波的能量。 因此， 结合图 3的性能曲线和 表 1 以及进行的多次实验效果可知， 本发明实施例中的移动终端， 对于高 频段 WCDMA1900/2100的 SAR以及 GSM1800/1900的 SAR的吸收较为明 显， 而且对于七个频段 GSM850/900/1800/1900和 WCDMA850/1900/2100 的 TRP均没有影响， 实现了在保证通话质量的前提下， 选择性降低移动终 端 SAR的目的。
图 4示出了本发明降低移动终端电磁波能量吸收比的方法的流程， 如 图 4所示， 所述方法包括下述步骤：
步骤 401 , 确定吸波材料在移动终端上的位置；
具体地， 将吸波材料在移动终端上的位置确定为 LCD的 FPC, 其中， 移动终端的 LCD包括 LCD的显示区域和位于 LCD显示区域下方的 FPC , 而吸波材料是贴于 FPC的上表面， FPC 的背面为移动终端主板的参考地； 本发明实施例中， 根据辐射性能和空间布置确定移动终端的天线为单 极子天线、 或 IFA天线， 此时， 需要将位于天线区域背面的主板上的参考 地挖掉， 变为净空； 所述天线可以形成在天线支架或移动终端的后壳上， 当天线形成于天线支架上时， 具体为贴于天线支架上， 且位于天线支架的 背面， 因此， 本发明实施例中， 天线与吸波材料所在的位置是在空间上隔 开的。
其中， 由于吸波材料与天线的距离过近， 会影响天线进行电磁波的发 射， 影响通话质量； 吸波材料与天线的距离过远， 则吸波材料吸收天线所 发射电磁波的效果会受到影响； 因此， 所述吸波材料的位置为与天线距离 为 10mm的 FPC区域，且所述 FPC区域的背面为所述移动终端主板的参考 地， 此时不仅降低移动终端 SAR的效果最为明显， 同时保证了移动终端的 TRP不受影响。
步骤 402, 将所述吸波材料贴于所述位置上， 用于吸收所述移动终端的 天线放射的电磁波能量。
具体地， 将所述吸波材料贴于所述 FPC上， 且吸波材料的上边界不超 过 LCD显示区域的下边界， 吸波材料的左边界和右边界分别不超过 LCD 的左边界和有边界， 吸波材料的下边界不超过 LCD的下边界。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种移动终端， 包括液晶显示屏 LCD、 主板、 天线， 其特征在于， 所述移动终端还包括： 吸波材料， 位于 LCD的柔性电路板 FPC上， 用于吸 收所述天线放射的电磁波能量。
2、 根据权利要求 1所述的移动终端， 其特征在于， 所述天线为单极子 天线、 或 IFA天线。
3、 根据权利要求 1所述的移动终端， 其特征在于， 所述吸波材料具体 用于吸收频率为 1GHz以上电磁波的能量，且吸波材料的位置为与天线距离 为 10mm的 FPC区域； 所述 FPC区域的背面为所述主板的参考地。
4、 根据权利要求 1至 3任一项所述的移动终端， 其特征在于， 所述吸 界分别不超过 LCD的左边界和右边界， 吸波材料的下边界不超过 LCD的 下边界。
5、 一种降低移动终端电磁波能量吸收比的方法， 其特征在于， 所述方 法包括：
确定将吸波材料设置于移动终端中 LCD的柔性电路板 FPC上； 将所述吸波材料贴于所述 FPC上， 吸收所述移动终端的天线放射的电 磁波能量。
6、 根据权利要求 5所述的方法， 其特征在于， 所述确定将吸波材料设 置于移动终端中 LCD的 FPC上为：确定吸波材料在移动终端上的位置为与 天线距离为 10mm的 FPC区域，且所述 FPC区域的背面为所述移动终端主 板的参考地。
7、 根据权利要求 5或 6所述的方法， 其特征在于， 将所述吸波材料贴 于所述 FPC上为： 将所述吸波材料贴于所述 FPC上， 且吸波材料的上边界
不超过 LCD显示区域的下边界， 吸波材料的左边界和右边界分別不超过 LCD的左边界和有边界， 吸波材料的下边界不超过 LCD的下边界。
PCT/CN2011/070898 2010-11-04 2011-02-09 一种移动终端及降低其电磁波能量吸收比的方法 WO2012058878A1 (zh)

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