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WO2016061997A1 - 一种天线结构 - Google Patents

一种天线结构 Download PDF

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Publication number
WO2016061997A1
WO2016061997A1 PCT/CN2015/074777 CN2015074777W WO2016061997A1 WO 2016061997 A1 WO2016061997 A1 WO 2016061997A1 CN 2015074777 W CN2015074777 W CN 2015074777W WO 2016061997 A1 WO2016061997 A1 WO 2016061997A1
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Prior art keywords
arm
antenna
dual
frequency
branch portion
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PCT/CN2015/074777
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English (en)
French (fr)
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谢一泓
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中兴通讯股份有限公司
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Publication of WO2016061997A1 publication Critical patent/WO2016061997A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith

Definitions

  • This paper relates to the field of communications, and in particular to an antenna structure.
  • SAR is the specific absorption rate. Under the action of an external electromagnetic field, an induced electromagnetic field will be generated in the human body. Since every organ in the human body is a lossy medium, the electromagnetic field in the body will generate electric current, resulting in absorption and dissipation of electromagnetic energy. SAR is commonly used in biodoping to characterize this physical process. SAR is defined as the electromagnetic power absorbed or consumed by human tissue per unit mass in W/kg.
  • wireless terminals mobile phones, data cards, MiFi/Hotspot
  • wireless terminals mobile phones, data cards, MiFi/Hotspot
  • the public is increasingly concerned about the impact of electromagnetic radiation from wireless terminal products on human health. Therefore, many markets currently require SAR for mobile terminal products, and many products must meet FCC/CE SAR requirements. This puts higher requirements on the design of the mobile terminal antenna.
  • the current SAR technology reduces the cable power and absorbing materials. These aspects are either sacrificing the total radiated power TRP of the antenna, affecting the communication signal, or increasing the cost and process complexity.
  • the antenna design really solves the problem of SAR.
  • the antenna design can basically be unipolar multi-arm, monopole plus parasitic IFA plus parasitic and other forms, and the high frequency (1700-2700MHz) that comes out of these kinds of routing forms, although the performance of the active test OTA is generally good, the SAR value is generally high, and even the SAR value exceeds the standard, becoming a mobile terminal.
  • the main board 1 is connected to the single-pole dual-arm antenna through a feeding point and an impedance matching network to feed the single-pole dual-arm antenna.
  • the common single-pole dual-arm antenna is composed of two arms, that is, a low-frequency long arm 51 and a high-frequency short arm 52; wherein the low-frequency long arm 51 is mainly configured to achieve low-frequency resonance.
  • the low-frequency long arm 51 is mainly configured to achieve low-frequency resonance.
  • the length of the two arms and the impedance matching network can be adjusted so that the double resonance of the low frequency long arm 51 and the resonance generated by the high frequency short arm 52 are interleaved to widen the bandwidth of the antenna.
  • the main disadvantage of such a conventional single pole dual arm antenna is that the SAR value of the high frequency band realized by the high frequency short arm 52 is generally high.
  • Embodiments of the present invention provide an antenna structure to solve the technical problem of how to effectively reduce the specific absorption rate SAR of a dual-arm antenna.
  • an antenna structure including:
  • a main board connected to the dual-arm antenna and feeding the dual-arm antenna;
  • the dual-arm antenna includes: a first arm configured to achieve low-frequency resonance, a second arm configured to achieve high-frequency resonance, and a coupling branch;
  • the first end of the first arm and the first end of the second arm are respectively connected to the main board;
  • the coupling branch is parallel to the second arm, and the coupling branch includes: a first branch portion and a second branch portion, wherein the first branch portion is disposed side by side with the first portion of the second arm, the first a first portion of the second arm is formed as a portion of the second end of the second arm extending toward the first end; the second branch portion is away from the first end of the second arm relative to the first branch portion The direction of the extension is; the second branch portion is connected to the first arm.
  • the length of the first branch portion is less than 10 mm.
  • a distance of an end of the second branch portion away from the first branch portion and a second end of the first arm is between 10 mm and 15 mm.
  • the first end of the first arm is connected to the main board through a feeding point and impedance matching.
  • the first end of the second arm is coupled to the first end of the first arm.
  • the first end of the second arm is connected to the main board through a grounding point.
  • the distance between the grounding point and the feeding point is less than a preset value, and the preset value is 5 mm.
  • the first end of the first arm is further connected to the main board through the grounding point.
  • the first end of the second arm is coupled to the first end of the first arm.
  • the first end of the second arm is connected to the main board through the grounding point.
  • the antenna structure includes a main board and a dual-arm antenna, and the main board feeds the two-arm antenna through a feeding point and impedance matching; the first arm of the dual-arm antenna is connected to the main board through impedance matching and a feeding point, The two arms are led out from the beginning of the first arm or are led out by the grounding point; in addition, the coupling branch is also led out from the end of the first arm, and the coupling branch is coupled with the second arm end in parallel, and the second current is changed by coupling.
  • the distribution and dispersion of the electric field improve the high-band SAR value achieved by the second arm in the ordinary single-pole dual-arm antenna, and reduce the SAR value of the antenna.
  • FIG. 1 is a schematic structural view of a related conventional single-pole dual-arm antenna
  • Figure 2 is a detailed structural view of the conventional single-pole dual-arm antenna of Figure 1;
  • FIG. 3 is a schematic structural view of an antenna according to an embodiment of the present invention.
  • FIG. 4 is a detailed structural diagram of an antenna of the embodiment of the present invention in FIG. 3;
  • FIG. 5 is a detailed structural diagram of still another antenna in the embodiment of the present invention.
  • FIG. 6 is a detailed structural diagram of an IFA dual-arm antenna in an embodiment of the present invention.
  • Fig. 7 is a view showing the detailed structure of still another IFA dual-arm antenna in the embodiment of the present invention.
  • the embodiment of the present invention provides an antenna structure for the problem that the current terminal SAR value is relatively high.
  • an embodiment of the present invention provides an antenna structure, which can reduce a high frequency SAR value of a terminal, where the antenna includes:
  • a main board 1 connected to the dual-arm antenna 5 and feeding the dual-arm antenna 5;
  • the dual-arm antenna 5 includes: a first arm configured to achieve low-frequency resonance, a second arm configured to achieve high-frequency resonance, and a coupling branch 53, a first arm configured to achieve low-frequency resonance in this embodiment
  • the second arm provided to realize high frequency resonance corresponds to the high frequency short arm 52 shown in FIG.
  • the first end of the low frequency long arm 51 and the first end of the high frequency short arm 52 are respectively connected to the main board;
  • the coupling branch 53 is parallel to the high frequency short arm 52 and includes: a first branch portion 531 and a second branch portion 532, wherein the first branch portion 531 and the first portion 521 of the high frequency short arm Positioned side by side, the first portion 521 of the high frequency short arm forms a portion of the second end of the high frequency short arm 52 extending toward the first end; the second branch portion 532 is opposite to the first branch portion 531 Extending from a direction away from the first end of the high frequency short arm 52; the second branch portion 532 is coupled to the low frequency long arm 51.
  • the length of the first branch portion 531 is less than 10 mm; the distance between the end of the second branch portion 532 away from the first branch portion 531 and the second end of the low frequency long arm 51 is located at 10 mm to Between 15mm.
  • the first end of the low frequency long arm 51 is connected to the main board 1 through a feeding point 2 and an impedance matching 3, and the first end of the high frequency short arm 52 is opposite to the first end of the low frequency long arm 51. connection.
  • the first end of the high frequency short arm 52 can also be directly connected to the main board 1 through the grounding point 4.
  • the distance between the grounding point 4 and the feeding point 2 is less than a preset value, and the preset value is 5 mm.
  • the dual-arm antenna is an inverted-F dual-arm antenna
  • the first end of the low-frequency long arm 51 is further connected to the main board 1 through the grounding point 4
  • the high-frequency short arm A first end of the 52 is coupled to the first end of the low frequency long arm 51.
  • the first end of the high frequency short arm 52 can also be connected to the main board 1 through a grounding point 4.
  • the main board feeds the two-arm antenna through the feeding point and the impedance matching;
  • the line consists of a low-frequency long arm, a high-frequency short arm and a coupling branch; the low-frequency long arm is connected to the main board through impedance matching and a feeding point; the high-frequency long arm is led out from the beginning of the low-frequency short arm or is led out by the grounding point;
  • the distance between the grounding points is generally less than 5 mm;
  • the coupling branches are drawn from the end of the low-frequency long arm 10-15 mm, and the ends of the high-frequency short arms are staggered in parallel, and the staggering distance is less than 10 mm.
  • the coupling branch is coupled with the end of the high-frequency short arm in parallel, and the current distribution on the high-frequency short arm is changed by coupling to disperse the electric field, thereby improving the high-band SAR value of the ordinary single-pole dual-arm antenna realized by the high-frequency short arm. In the higher case, the SAR value of the antenna is lowered.
  • the antenna in the embodiment of the present invention also includes a main body including a main board 1, a feeding point 2, a grounding point 3, an impedance matching 4, and a monopole dual-arm antenna 5.
  • the single-pole dual-arm antenna of the present embodiment includes a coupling branch 53 in addition to the low-frequency long arm 51 and the high-frequency short arm 52.
  • the working principle of the dual-arm antenna is similar to that of the ordinary monopole antenna.
  • the low-band resonance is realized by the local oscillator resonance of the low-frequency long arm 51, and the high-band resonance is performed by the double frequency of the low-frequency long arm 51 and the high-frequency short arm 52. achieve.
  • the coupling branch 53 is introduced into the antenna design in this embodiment, that is, it is taken out from the end of the low frequency long arm 51 by 10-15 mm.
  • a short trace runs in the direction of the high frequency short arm 52 and is parallel to the end of the high frequency short arm 52 and has a side-by-side arrangement with a staggered distance of less than 10 mm. Since the coupling branch 53 drawn from the low-frequency long arm 51 is short, the influence on the low-frequency resonance is small, and the low-frequency resonance performance remains substantially unchanged; and the coupling branch 53 and the high-frequency short arm 52 are equally staggered, and the original height is changed by the coupling action. The current distribution on the short arm 52 changes the surrounding electromagnetic field and disperses it, thereby achieving the purpose of reducing the high frequency SAR value.
  • FIG. 5 another implementation form of reducing the SAR monopole dual-arm antenna in this embodiment is shown.
  • the high-frequency short arm 52 is directly connected to the grounding point 4 as a parasitic branch, instead of being drawn from the beginning of the low-frequency long arm 51, which is fed by the coupling with the low-frequency long arm 51, which can be realized. High frequency band resonance.
  • the SAR value of the high frequency resonance generated by the high frequency short arm 52 can also be lowered.
  • another implementation form of reducing the SAR dual-arm antenna is realized by the form of an IFA antenna + a parasitic branch.
  • the main board 1 is connected to the low frequency long arm 51 of the dual arm antenna 5 through the feeding point 2 and the impedance matching 3, and the low frequency long arm 51 also passes through the grounding point 4 Connected to the main board 1 to achieve low-frequency resonance with an IFA antenna and high-frequency partial resonance with its double frequency.
  • the high-frequency short arm 52 is led out from the beginning of the low-frequency long arm 51 to realize high-frequency resonance; by adjusting its length and impedance matching, the resonance generated by it is interleaved with the resonance generated by the double-frequency of the low-frequency long arm 51, and the high-frequency bandwidth can be broadened.
  • the coupling branch 53 is taken out from the end of the low-frequency long arm 51 by 10-15 mm, is routed along the direction of the high-frequency short arm, and is parallel with the end of the high-frequency short arm and has a side-by-side arrangement, and the staggered distance is less than 10 mm.
  • the coupling of the high-frequency short arm changes the current on the high-frequency short arm to disperse the nearby electromagnetic field distribution and reduce the high-frequency SAR value.
  • FIG. 7 another implementation form of reducing the SAR dual-arm antenna in this embodiment.
  • the low frequency long arm 51 of the dual arm antenna is implemented by the IFA antenna like the antenna of FIG.
  • the difference is that the high frequency short arm 52 is led out by the grounding point 4 instead of the beginning of the low frequency long arm 51.
  • the high frequency short arm 52 in this implementation is fed by its coupling with the low frequency long arm 51 to achieve high frequency resonance.
  • the high frequency SAR value is reduced by the coupling between the high frequency short arm 52 and the coupling branch 53.
  • Table 1 shows the performance of the ordinary single-pole dual-arm antenna
  • Table 2 shows the performance table of the SAR single-pole dual-arm antenna.
  • WCDMA850, WCDMA1700 and WCDMA1900 represent three frequency bands
  • SAR represents the SAR value of the antenna corresponding to a certain channel of a certain frequency band.
  • the SAR data in the table is tested under the Speag Dasy5SAR test system.
  • the WCDMA1700 with the parasitic high-frequency short arm is reduced in the total radiated power (TRP).
  • TRP total radiated power
  • the SAR of the three channels (8762, 8846, 8912) has decreased.
  • the smallest SAR is the intermediate channel 8846.
  • the TRP is basically the same (normal single-pole dual-arm antenna 19.4, SAR unipolar)
  • the two-arm antenna 19.7), the maximum surface SAR values are: ordinary single-pole dual-arm antenna 1.86, SAR single-pole dual-arm antenna 1.07.
  • the SAR value of the low-frequency and high-frequency bands realized by the low-frequency long arm is basically the same, and the high-frequency SAR realized by the parasitic high-frequency short arm is adopted. Can be reduced by about 0.8W/Kg.
  • the present embodiment extracts the coupling branch on the low-frequency long arm of the dual-arm antenna and traces it along the direction of the high-frequency short arm so as to be parallelized with the end of the high-frequency short arm to generate a coupling effect, thereby changing the high-frequency short arm.
  • the current distribution on the distributed electromagnetic field distribution reduces the high frequency SAR value.
  • the relative position between the dual-arm antenna and the main board can be arbitrary, depending on the product designed
  • the reserved antenna clearance depends on.
  • the height of the antenna design space is guaranteed, and it can be realized by a bracket antenna or an LDS antenna (formed directly by laser).
  • the dual-arm antenna can be located in the upper area or the lower area of the main board; for ultra-thin products, the antenna
  • the design space is highly limited, and the single-pole dual-arm antenna can be directly etched on the main board, using a PCB antenna (the part of the printed circuit board for wireless reception and transmission).
  • the antenna structure of the above embodiment of the invention extracts the coupling branch from the low-frequency long arm of the dual-arm antenna. Since the coupling branch is led out from the end of the low-frequency long arm and has a short length, it has little effect on the low-frequency performance of the antenna; the coupling branch and the high The ends of the short-frequency arm are parallel-staggered for coupling, and the current distribution on the high-frequency short arm is changed by coupling to disperse the electric field, thereby improving the high-band SAR value achieved by the high-frequency short arm in the ordinary single-pole dual-arm antenna. Reduce the SAR value of the antenna and reduce the damage to the human body.
  • the above technical solution improves the high-band SAR value achieved by the second arm in the ordinary single-pole dual-arm antenna, and reduces the SAR value of the antenna.

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Abstract

一种天线结构，包括：双臂天线；与所述双臂天线连接并对双臂天线进行馈电的主板；所述双臂天线包括：设置为实现低频谐振的第一臂、设置为实现高频谐振的第二臂和耦合枝节；其中，所述第一臂的第一端和所述第二臂的第一端分别连接至所述主板；所述耦合枝节平行于所述第二臂，包括：第一枝节部分和第二枝节部分，其中所述第一枝节部分与第二臂的第一部分并排设置，所述第二臂的第一部分形成为第二臂的第二端朝第一端延伸的一部分；所述第二枝节部分相对于第一枝节部分向远离第二臂的第一端的方向延伸；所述第二枝节部分与第一臂连接。上述天线结构，降低了天线的比吸收率SAR，减小了对人体的辐射伤害。

Description

一种天线结构 技术领域
本文涉及通信领域，特别涉及一种天线结构。
背景技术
SAR即比吸收率。在外电磁场的作用下，人体内将产生感应电磁场。由于人体每种器官均为有耗介质，因此体内电磁场将会产生电流，导致吸收和耗散电磁能量。生物剂量学中常用SAR来表征这一物理过程。SAR定义为单位质量的人体组织所吸收或消耗的电磁功率，单位为W/kg。
随着无线通信技术飞速发展，无线终端(手机、数据卡、MiFi/Hotspot)产品已被广泛应用到生活中。与此同时，公众也越来越关心无线终端产品带来的电磁辐射对人体健康的影响。故目前许多市场对移动终端产品的SAR提出了要求，许多产品都必须满足FCC/CE SAR要求。这就对移动终端天线设计提出了更高的要求。目前的降SAR技术，多采用降低线缆功率、吸波材料等，这些方面要么是牺牲了天线的总辐射功率TRP，影响了通信信号，要么就是增加了成本和工序复杂度，没有从根本的天线设计上真正地解决SAR的问题。
相关的外形小巧、轻薄的移动终端所留给天线的净空比较小，高度也较低，在需要覆盖的频段较多的情况下天线设计基本上可采用就是单极多臂、单极加寄生与IFA加寄生等形式，而这几种走线形式走出来的高频(1700-2700MHz)尽管一般有源测试OTA性能较好，但是SAR值一般都会比较高，甚至导致SAR值超标，成为移动终端天线设计的难题之一。
如图1所示，为普通单极双臂天线，该种天线结构中，主板1通过馈电点及阻抗匹配网络与单极双臂天线连接，给单极双臂天线进行馈电。
图2为图1普通单极双臂天线的详细结构图，普通单极双臂天线由两臂组成，即低频长臂51与高频短臂52；其中低频长臂51主要设置为实现低频谐振，较理想的情况，也可以调节其长度及阻抗匹配网络，利用其二倍频实 现高频段的谐振，但是此时高频带宽较窄，且谐振位置受限制；高频短臂52设置为实现高频的谐振，其设计较为灵活，长度可根据所需要实现的频段自由控制，较理想的情况，可调节两臂长度及阻抗匹配网络，使低频长臂51的二倍谐振与高频短臂52所产生的谐振交错合并，可展宽天线的带宽。然而，这种普通单极双臂天线的主要缺点是，由高频短臂52实现的高频段的SAR值一般都比较高。
发明内容
本发明实施例提供了一种天线结构，以解决如何有效降低双臂天线的比吸收率SAR的技术问题。
为了解决上述技术问题，本发明实施例提供了一种天线结构，包括：
双臂天线；
与所述双臂天线连接并对所述双臂天线进行馈电的主板；
所述双臂天线包括：设置为实现低频谐振的第一臂、设置为实现高频谐振的第二臂和耦合枝节；
所述第一臂的第一端和所述第二臂的第一端分别连接至所述主板；
所述耦合枝节平行于所述第二臂，耦合枝节包括：第一枝节部分和第二枝节部分，其中所述第一枝节部分与所述第二臂的第一部分并排设置，所述第二臂的第一部分形成为所述第二臂的第二端朝第一端延伸的一部分；所述第二枝节部分相对于所述第一枝节部分向远离所述第二臂的第一端的方向延伸；所述第二枝节部分与所述第一臂连接。
可选地，所述第一枝节部分的长度小于10mm。
可选地，所述第二枝节部分远离所述第一枝节部分的一端与所述第一臂的第二端的距离位于10mm至15mm之间。
可选地，所述第一臂的第一端通过馈电点和阻抗匹配与所述主板相连接。
可选地，所述第二臂的第一端与所述第一臂的第一端相连接。
可选地，所述第二臂的第一端通过接地点与所述主板相连接。
可选地，所述接地点和所述馈电点之间的距离小于一预设值，所述预设值为5mm。
可选地，当所述双臂天线为倒F型双臂天线时，所述第一臂的第一端还通过所述接地点与所述主板相连接。
可选地，所述第二臂的第一端与所述第一臂的第一端相连接。
可选地，所述第二臂的第一端通过所述接地点与所述主板相连接。
上述技术方案的有益效果如下：
上述方案中，天线结构包括有主板、双臂天线，主板通过馈电点及阻抗匹配给双臂天线进行馈电；双臂天线中的第一臂通过阻抗匹配及馈电点与主板连接，第二臂由第一臂的始端引出或由接地点引出；此外，由第一臂的末端还引出了耦合枝节，耦合枝节与第二臂末端平行交错进行耦合，通过耦合作用改变第二上的电流分布，分散电场，从而改善了普通单极双臂天线中由第二臂实现的高频段SAR值较高的情况，降低天线的SAR值。
附图概述
图1表示相关普通单极双臂天线的结构示意图；
图2表示图1中普通单极双臂天线的详细结构图；
图3表示本发明实施例中的一种天线结构示意图；
图4表示图3中本发明实施例的天线详细结构图；
图5表示本发明实施例中的又一种天线详细结构图；
图6表示本发明实施例中的一种IFA双臂天线详细结构图；
图7表示本发明实施例中的又一种IFA双臂天线详细结构图。
附图标记说明：
1-主板；2-馈电点；3-阻抗匹配；4-接地点；5-双臂天线；51-低频长臂；52-高频短臂；521-高频短臂的第一部分；53-耦合枝节；531-第一枝节部分；532-第二枝节部分。
本发明的较佳实施方式
下面将结合附图对实施例进行详细描述。
本发明实施例针对目前终端SAR值比较高的问题，提供了一种天线结构。
如图3至图7所示，本发明实施例提供了一种天线结构，该结果的天线能够降低终端高频SAR值，所述天线包括：
双臂天线5；
与所述双臂天线5连接并对所述双臂天线5进行馈电的主板1；
可选地，所述双臂天线5包括：设置为实现低频谐振的第一臂、设置为实现高频谐振的第二臂和耦合枝节53，本实施例中设置为实现低频谐振的第一臂对应图4所示的低频长臂51，设置为实现高频谐振的第二臂对应图4所示的高频短臂52。
所述低频长臂51的第一端和所述高频短臂52的第一端分别连接至所述主板；
所述耦合枝节53平行于所述高频短臂52，包括：第一枝节部分531和第二枝节部分532，其中所述第一枝节部分531与所述高频短臂的第一部分521并排设置，所述高频短臂的第一部分521形成所述高频短臂52的第二端朝第一端延伸的一部分；所述第二枝节部分532相对于所述第一枝节部分531向远离所述高频短臂52的第一端的方向延伸；所述第二枝节部分532与所述低频长臂51连接。
可选地，所述第一枝节部分531的长度小于10mm；所述第二枝节部分532远离所述第一枝节部分531的一端与所述低频长臂51的第二端的距离位于10mm至15mm之间。
所述低频长臂51的第一端通过馈电点2和阻抗匹配3与所述主板1相连接，所述高频短臂52的第一端与所述低频长臂51的第一端相连接。可选地，所述高频短臂52的第一端还可以通过接地点4与所述主板1直接相连接。
可选地，所述接地点4和所述馈电点2之间的距离小于一预设值，所述预设值为5mm。
可选地，当所述双臂天线为倒F型双臂天线时，所述低频长臂51的第一端还通过所述接地点4与所述主板1相连接，所述高频短臂52的第一端与所述低频长臂51的第一端相连接。可选地，所述高频短臂52的第一端还可以通过接地点4与所述主板1相连接。
上述方案中，主板通过馈电点及阻抗匹配给双臂天线进行馈电；双臂天 线由低频长臂、高频短臂及耦合枝节组成；低频长臂通过阻抗匹配及馈电点与主板相连接；高频长臂由低频短臂始端引出或者由接地点引出；馈电点与接地点之间的距离一般小于5mm；耦合枝节由距离低频长臂末端10-15mm处引出，并高频短臂末端平行交错，交错距离小于10mm。耦合枝节与高频短臂末端平行交错进行耦合，通过耦合作用改变高频短臂上的电流分布，分散电场，从而改善了普通单极双臂天线中由高频短臂实现的高频段SAR值较高的情况，降低天线的SAR值。
如图3所示，本发明实施例中的天线同样包括主包括主板1、馈电点2、接地点3，阻抗匹配4和单极双臂天线5。
如图4所示，与普通单极双臂天线不同，本实施例中的单极双臂天线，除了包括低频长臂51与高频短臂52，还包括耦合枝节53。该双臂天线的工作原理与普通单极天线的工作原理类似，低频段谐振由低频长臂51的本振谐振实现，高频段谐振由低频长臂51的二倍频与高频短臂52共同实现。由于普通单极双臂天线中由高频短臂52实现的高频段的SAR值比较高，本实施例在天线设计上引入了耦合枝节53，即从距离低频长臂51末端10-15mm处引出一根较短的走线，使其沿高频短臂52方向走向，并与高频短臂52末端平行且具有并列排列的部分，交错距离小于10mm。由于由低频长臂51上引出的耦合枝节53较短，对低频谐振影响也较小，低频谐振性能基本保持不变；而耦合枝节53与高频短臂52平等交错，通过耦合作用改变原高频短臂52上的电流分布，从而改变周围电磁场，将其分散，从而达到降低高频SAR值的目的。
如图5所示，本实施例中降低SAR单极双臂天线的又一种实现形式。该种实现形式中，高频短臂52作为寄生枝节，直接与接地点4连接，而非从低频长臂51始端引出，其通过与低频长臂51之间的耦合作用进行馈电，可以实现高频段谐振。通过高频短臂52与耦合枝节53的耦合作用，同样可以将由高频短臂52产生的高频谐振的SAR值降低。
如图6所示，本实施例中降低SAR双臂天线的又一种实现形式，该种双臂天线是由IFA天线+寄生枝节的形式来实现。主板1通过馈电点2及阻抗匹配3与双臂天线5的低频长臂51相连接，同时，低频长臂51还通过接地点4 与主板1相连接，以IFA天线实现低频段的谐振，并以其二倍频实现高频部分谐振。高频短臂52由低频长臂51始端引出，实现高频谐振；通过调节其长度及阻抗匹配，使其产生的谐振与低频长臂51二倍频产生的谐振交错合并，可展宽高频带宽。耦合枝节53由距离低频长臂51末端10-15mm处引出，沿着高频短臂方向走线，并与高频短臂末端平行且具有并列排列的部分，交错距离小于10mm，也是通过其与高频短臂的耦合作用改变高频短臂上的电流从而分散附近的电磁场分布，降低高频SAR值。
如图7所示，本实施例中降低SAR双臂天线的又一种实现形式。该种双臂天线的低频长臂51与图6中的天线一样，用IFA天线实现。所不同的是其高频短臂52由接地点4引出而非低频长臂51的始端引出。这种实现形式中的高频短臂52通过其与低频长臂51的耦合作用进行馈电，实现高频谐振。同样，通过高频短臂52与耦合枝节53之间的耦合作用降低了高频的SAR值。
表1
Figure PCTCN2015074777-appb-000001
表2
Figure PCTCN2015074777-appb-000002
Figure PCTCN2015074777-appb-000003
针对此实施例，对如图1中的普通单极双臂天线与本实施例中可有效降低移动终端SAR值的单极双臂天线(见图3)的性能进行比较。参见表1和表2。其中表1为普通单极双臂天线性能表，表2为降SAR单极双臂天线性能表。其中WCDMA850、WCDMA1700和WCDMA1900表示三个频段，SAR表示对应某一频段的某一信道的天线的SAR值，表格中的SAR数据是在Speag公司的Dasy5SAR测试系统下测试所得。
从表1和表2可以看出，与普通单极双臂天线相比，采用降SAR单极双臂天线，由寄生高频短臂实现的WCDMA1700，在总辐射功率TRP(total radiated power)基本保持不变的情况下，三个信道(8762、8846、8912)的SAR均有所下降，SAR降低幅度最小的是中间信道8846，TRP基本一样(普通单极双臂天线19.4，降SAR单极双臂天线19.7)，最大面SAR值分别为：普通单极双臂天线1.86，降SAR单极双臂天线1.07。由此可见，在TRP相当的情况下，采用降SAR单极双臂天线，由低频长臂实现的低频及高频频段SAR值基本保持不变，由寄生高频短臂实现的高频段的SAR可下降0.8W/Kg左右。
如此，本实施例通过在双臂天线的低频长臂上引出耦合枝节，并沿高频短臂方向走线，使其与高频短臂末端平行交错，产生耦合作用，从而改变高频短臂上的电流分布，分散电磁场分布，降低高频的SAR值。
此外，双臂天线与主板之间的相对位置可以是任意的，视所设计产品给 预留的天线净空而定。对于拥有一定厚度的产品，天线设计空间高度得到保证，可以用支架天线或者LDS天线(由激光直接成型)实现，此时双臂天线可位于主板的上方区域或者下方区域；对于超薄产品，天线设计空间高度受限，单极双臂天线则可直接刻蚀在主板上，用PCB天线(无线接收和发射用的印制线路板上的部分)实现。
上述发明实施例的天线结构，从双臂天线的低频长臂中引出耦合枝节，由于耦合枝节由低频长臂末端处引出，且长度较短，故对天线低频性能影响不大；耦合枝节与高频短臂末端平行交错进行耦合，通过耦合作用改变高频短臂上的电流分布，分散电场，从而改善了普通单极双臂天线中由高频短臂实现的高频段SAR值较高的情况，降低天线的SAR值，减小产品对人体的伤害。
以上所述是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明所述原理的前提下，还可以作出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。
工业实用性
上述技术方案改善了普通单极双臂天线中由第二臂实现的高频段SAR值较高的情况，降低天线的SAR值。

Claims (10)

  1. 一种天线结构，包括：
    双臂天线；
    与所述双臂天线连接并对所述双臂天线进行馈电的主板，
    所述双臂天线包括：设置为实现低频谐振的第一臂、设置为实现高频谐振的第二臂和耦合枝节；
    所述第一臂的第一端和所述第二臂的第一端分别连接至所述主板；
    所述耦合枝节平行于所述第二臂，耦合枝节包括：第一枝节部分和第二枝节部分，其中所述第一枝节部分与所述第二臂的第一部分并排设置，所述第二臂的第一部分形成为所述第二臂的第二端朝第一端延伸的一部分；所述第二枝节部分相对于所述第一枝节部分向远离所述第二臂的第一端的方向延伸；所述第二枝节部分与所述第一臂连接。
  2. 根据权利要求1所述的天线结构，其中，所述第一枝节部分的长度小于10mm。
  3. 根据权利要求1所述的天线结构，其中，所述第二枝节部分远离所述第一枝节部分的一端与所述第一臂的第二端的距离位于10mm至15mm之间。
  4. 根据权利要求1所述的天线结构，其中，所述第一臂的第一端通过馈电点和阻抗匹配与所述主板相连接。
  5. 根据权利要求4所述的天线结构，其中，所述第二臂的第一端与所述第一臂的第一端相连接。
  6. 根据权利要求4所述的天线结构，其中，所述第二臂的第一端通过接地点与所述主板相连接。
  7. 根据权利要求6所述的天线结构，其中，所述接地点和所述馈电点之间的距离小于一预设值，所述预设值为5mm。
  8. 根据权利要求4所述的天线结构，其中，当所述双臂天线为倒F型双臂天线时，所述第一臂的第一端还通过所述接地点与所述主板相连接。
  9. 根据权利要求8所述的天线结构，其中，所述第二臂的第一端与所述第一臂的第一端相连接。
  10. 根据权利要求8所述的天线结构，其中，所述第二臂的第一端通过所述接地点与所述主板相连接。
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