WO2018170967A1 - 一种金属外壳的物联网便携式多天线终端 - Google Patents

一种金属外壳的物联网便携式多天线终端 Download PDF

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WO2018170967A1
WO2018170967A1 PCT/CN2017/080458 CN2017080458W WO2018170967A1 WO 2018170967 A1 WO2018170967 A1 WO 2018170967A1 CN 2017080458 W CN2017080458 W CN 2017080458W WO 2018170967 A1 WO2018170967 A1 WO 2018170967A1
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dielectric substrate
antenna
inverted
metal
portable multi
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French (fr)
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吕文俊
高琛
袁成莹
朱洪波
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Nanjing University of Posts and Telecommunications
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Nanjing University of Posts and Telecommunications
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0404—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas the mobile station comprising multiple antennas, e.g. to provide uplink diversity

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  • the invention relates to an IoT portable multi-antenna terminal with a metal casing, belonging to the field of microwave technology and internet of things.
  • IoT portable terminals As a key technology in next-generation mobile communications, MIMO antennas can increase the capacity and reliability of the channel.
  • IoT portable terminals have become more and more popular. People's requirements for these terminals are not only powerful functions, but also have a beautiful appearance.
  • the outer casing is made of metal material IoT portable terminal because it has a more metallic appearance and a more comfortable hand, which is popular among users. Designers are therefore increasingly focusing on designing IoT portable terminals with all-metal materials.
  • the isolation between the units decreases.
  • the technical problem to be solved by the present invention is to provide an IoT portable multi-antenna terminal with a metal casing, which uses a T-shaped branch to extend the adjacent two polarized antenna element current paths to improve isolation and in the middle of the metal back shell. The appropriate position is slit to improve the impedance matching of the four antenna elements in the middle of the dielectric substrate.
  • the IoT portable multi-antenna terminal is small in size, simple in design, low in cost, and easy to implement in meeting performance requirements.
  • the invention provides a metal outer casing IoT portable multi-antenna terminal, comprising a dielectric substrate, first to eighth inverted F antenna units, first to fourth T-shaped branches and a metal casing;
  • the first to eighth inverted F antenna units are respectively disposed at two edges on the lower surface of the dielectric substrate, and are symmetric with respect to two symmetry axes of the dielectric substrate;
  • the first to fourth T-shaped segments are respectively disposed at four edges of the upper surface of the dielectric substrate, and the projection of each T-shaped branch on the lower surface of the dielectric substrate is located between two inverted F antenna units, and two inverted F antenna units Regarding the T-shaped branch symmetry between the two;
  • the upper surface of the dielectric substrate is further provided with a metal grounding plate, and the metal grounding plate is respectively connected to the first to fourth T-shaped branches, and the projection of the metal grounding plate on the lower surface of the dielectric substrate and the first to eighth inverted F antenna units are not overlapping;
  • Grounding points of the first to eighth inverted F antenna units are respectively connected to the metal grounding plate through the metallized via holes;
  • the metal casing is disposed on the outer side of the dielectric substrate, and has a gap between the metal substrate; the metal casing includes a back shell and a frame, The back shell is further provided with two parallel rectangular grooves.
  • the two rectangular grooves are symmetric with respect to the longitudinal direction of the dielectric substrate, and the projection of the two rectangular grooves on the lower surface of the dielectric substrate overlaps with the inverted F antenna unit.
  • two annular grooves are respectively formed at a pair of short sides of the back shell of the metal casing.
  • the two long sides of the frame are respectively slotted to communicate with the two annular grooves on the back shell.
  • the two annular grooves on the back shell and the grooves on the frame are filled with a non-metallic substance.
  • the antenna terminal is symmetrical about the two axes of symmetry of the dielectric substrate.
  • the present invention has the following technical effects: the invention has a metal outer casing of the Internet of Things portable multi-antenna terminal, and in the case of using the metal casing, each unit of the multi-antenna system can still be ensured. Both have good impedance matching. At the same time, high isolation between units is achieved on a limited-sized IoT portable terminal. Therefore, this is an IoT portable terminal with novel appearance, simple structure and low manufacturing process requirements.
  • 1 is a schematic diagram showing the front structure and reference coordinates of an IoT portable terminal of the metal casing.
  • FIG. 2 is a three-dimensional schematic diagram and reference coordinates of the IoT portable terminal of the metal casing.
  • Fig. 3 is a diagram showing the calculation of the reflection coefficient characteristics of the antenna elements 2.1 and 2.5 of the portable terminal by using the HFSS software.
  • FIG. 4 is a schematic diagram of calculating the transfer coefficient between the antenna unit 2.1 of the portable terminal and other units using the HFSS software.
  • Fig. 5 is a diagram showing the calculation of the transfer coefficient between the antenna unit 2.5 of the portable terminal and other units using the HFSS software.
  • the structure of the IoT portable multi-antenna terminal of the metal casing of the present invention is such that an H-shaped metal ground 5 and four Ts respectively connected to the metal ground 5 are disposed on the upper surface of the dielectric substrate 1.
  • the branch section 6; the four T-shaped branches 6 are respectively disposed in the middle of the four edges of the dielectric substrate, and the opposite two T-shaped branches 6 are respectively symmetric about the X and Y axes.
  • the lower surface of the dielectric substrate 1 is provided with eight inverted F antenna elements 2.1 to 2.8, and the projection of the eight inverted F antenna elements on the upper surface does not overlap with the metal ground 5.
  • the eight inverted F antenna elements 2.1 to 2.8 are respectively disposed at two edges of the dielectric substrate 1, and the inverted F antenna elements 2.2, 2.4, 2.5, 2.6 and the inverted F antenna elements 2.1, 2.3, 2.7, 2.8 are respectively related to the Y axis.
  • Symmetrical, inverted F antenna elements 2.1, 2.2, 2.6, 2.7 and inverted F antenna elements 2.3, 2.4, 2.5, 2.8 are respectively symmetric about the X axis.
  • Each of the inverted F antenna elements has a feed point 3 and a ground point 4, and the ground point 4 of the antenna is connected to the metal ground 5 of the top layer of the dielectric substrate 1 through the metallized via.
  • the T-shaped branch 6 is located between two inverted F antenna elements, and the inverted F antenna elements on both sides of the T-shaped branch 6 are symmetrical about the T-shaped branch 6.
  • the outer side of the dielectric substrate 1 is further provided with a metal outer casing.
  • the metal outer casing is an upper opening structure including a back shell and a frame, and a certain gap exists between the metal shell and the dielectric substrate.
  • the back shell is also provided with two rectangular grooves parallel to the Y axis, and the two rectangular grooves are symmetrical about the Y axis.
  • the dielectric substrate of the present embodiment has a relative dielectric constant of 2.65 and a thickness of 2 mm, and the distance between the dielectric substrate and the metal casing is 0.3 mm.
  • S11 represents the reflection coefficient of the feed port 3 of the inverted F antenna unit 2.1
  • S55 represents the reflection coefficient of the feed port of the inverted F antenna unit 2.5
  • S12 represents the inverted F antenna unit.
  • S16 represents the transmission coefficient between the feed port of the inverted F antenna unit 2.1 and the feed port of 2.6
  • S17 represents the feed of the inverted F antenna unit 2.1.
  • S54 represents the transmission coefficient between the feed port of the inverted F antenna unit 2.5 and the feed port of 2.4
  • S56 represents the feed port of the inverted F antenna unit 2.5 and 2.6.
  • the transmission coefficient between the feed ports, S57 represents the transmission coefficient between the feed port of the inverted F antenna unit 2.5 and the feed port of 2.7
  • S58 represents the feed port of the inverted F antenna unit 2.5 and the feed port of 2.8. Transmission coefficient between.
  • the impedance matching curve of the reflection coefficient curve of S11 corresponding to the broken line and the reflection coefficient curve of S55 corresponding to the solid line is 3.28 GHz-3.53 GHz. From Figure 4, we can see that the transmission coefficient is less than -10 dB in the matching bandwidth. Similarly in Figure 5, we can see that within the impedance matching bandwidth of the antenna unit, the transmission coefficient of the antenna unit is less than -10dB.
  • the portable terminal ensures a small degree of coupling between the antenna elements by polarization orthogonality and addition of T-shaped branches at a small size, and at the same time improves by opening at appropriate positions in the middle of the metal back shell.
  • the terminal antenna has high efficiency, simple structure and small volume, which makes the antenna have a wide range of applications.
  • the polarization mode of the four units on the left and right ends of the dielectric substrate is orthogonal to the polarization mode of the four central units in the middle, and the two polarization units on the left end and the two polarization units on the right end and the four in the middle
  • the polarized unit adopts the method of adding T-shaped branches on the ground to achieve better isolation between the 8 units.
  • the terminal uses a metal casing, the matching of the antenna is deteriorated.
  • This design uses a seam at a suitable place in the metal back casing to achieve a good match.
  • the invention will provide a design method of a metal outer casing IoT portable multi-antenna terminal, which adopts a metal outside In the case of a shell, the eight antenna elements are well matched and have a high degree of isolation from each other. In addition, the design of the IoT portable terminal with metal casing is in line with the current trend.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

本发明公开了一种金属外壳的物联网便携式多天线终端，属于微波技术和物联网领域。在相对介电常数为2-20范围内的介质基板顶层设计8个尺寸相同的倒F天线单元，底层作为金属地，在每邻近的两个同极性单元之间的地上加上T型枝节，以保证较高隔离度。外加金属壳，在背壳的中部添加两道缝隙，同时改善介质基板中部4个天线单元的匹配与隔离度。本发明的组合天线带宽可达250MHz并且保证10dB以上的隔离度，具有结构简单、体积小、制作成本低廉等特点，其应用范围十分广泛。

Description

一种金属外壳的物联网便携式多天线终端 技术领域
本发明涉及一种金属外壳的物联网便携式多天线终端，属于微波技术和物联网领域。
背景技术
作为新一代移动通信中关键技术，MIMO天线可以提高信道的容量和可靠性。同时近年来物联网便携式终端越来越普及，人们对这些终端的要求不仅仅是强大的功能，而且要拥有靓丽的外观。而外壳采用了金属材质物联网便携式终端因为其外观更富有金属光泽，手感更舒适，受到广大用户的喜爱。设计厂商因而越来越注重设计外壳采用全金属材质的物联网便携式终端。
因为物联网便携式终端的尺寸有限，随着天线单元的增加，各个单元之间的隔离度就会减小。目前在小空间内提升隔离度的方法有三类：一类是在端口加上复杂的解耦合网络；第二类是采用正交的极化特性来解耦合；第三类是在金属地采取一些手段来解耦合。
发明内容
本发明所要解决的技术问题是提供一种金属外壳的物联网便携式多天线终端，使用了T型枝节延长邻近的两个同极化天线单元电流路径以提高隔离度，并且在金属背壳的中部的适当位置开缝，改善介质基板中部的四个天线单元的阻抗匹配。该物联网便携式多天线终端在满足性能要求的情况下，尺寸小、设计简单、成本低且易于实现。
本发明为解决上述技术问题采用以下技术方案：
本发明提供一种金属外壳的物联网便携式多天线终端，包括介质基板、第一至第八倒F天线单元、第一至第四T形枝节以及金属外壳；
其中，第一至第八倒F天线单元分别两两设置在介质基板的下表面的四个边缘，且关于介质基板的两条对称轴对称；
第一至第四T形枝节分别设置在介质基板的上表面的四个边缘，每个T形枝节在介质基板下表面的投影位于两个倒F天线单元之间，且两个倒F天线单元关于两者之间的T形枝节对称；
介质基板的上表面还设置有一个金属接地板，金属接地板分别与第一至第四T形枝节连接，且金属接地板在介质基板下表面的投影与第一至第八倒F天线单元不重叠；
第一至第八倒F天线单元的接地点分别通过金属化过孔与金属接地板连接；
金属外壳设置在介质基板的外侧，，与介质基板之间存在间隙；金属外壳包括背壳和边框， 背壳上还设置有两个平行的矩形槽，两个矩形槽关于介质基板长边方向对折线对称，且两个矩形槽在介质基板下表面的投影与倒F天线单元重叠。
作为本发明的进一步优化方案，在金属外壳的背壳的一对短边处分别开有两个环形槽。
作为本发明的进一步优化方案，在边框的两个长边的两端分别开槽，分别与背壳上的两个环形槽连通。
作为本发明的进一步优化方案，背壳上两个环形槽以及边框上的开槽均采用非金属物质填充。
作为本发明的进一步优化方案，该天线终端关于介质基板的两条对称轴均对称。
本发明采用以上技术方案与现有技术相比，具有以下技术效果：本发明一种金属外壳的物联网便携式多天线终端，在使用金属外壳的情况下，仍能保证多天线系统的每个单元都有良好的阻抗匹配。同时在尺寸有限的物联网便携式终端上实现了各单元之间较高的隔离度。因而这是一种外观新颖，结构简单，制作工艺要求低的物联网便携式终端。
附图说明
图1是该金属外壳的物联网便携式终端的正面结构与参考坐标示意图。
图2是该金属外壳的物联网便携式终端的三维立体示意图与参考坐标示意图。
图3是利用HFSS软件计算便携式终端的天线单元2.1和2.5反射系数特性示意图。
图4是采用HFSS软件计算便携式终端的天线单元2.1和其他单元间传递系数的示意图。
图5是采用HFSS软件计算便携式终端的天线单元2.5和其他单元间传递系数的示意图。
具体实施方式
下面结合附图对本发明的技术方案做进一步的详细说明：
对照附图1、图2，本发明一种金属外壳的物联网便携式多天线终端的结构是：在介质基板1的上表面设置H形的金属地5以及分别与金属地5连接的四个T型枝节6；四个T型枝节6分别设置在介质基板的四个边缘的中部，且相对的两个T型枝节6分别关于X、Y轴对称。
介质基板1的下表面设置八个倒F天线单元2.1至2.8，且八个倒F天线单元在上表面的投影与金属地5不重叠。八个倒F天线单元2.1至2.8分别两两设置在介质基板1的四个边缘，且倒F天线单元2.2,2.4,2.5,2.6和倒F天线单元2.1,2.3,2.7,2.8分别关于Y轴对称，倒F天线单元2.1，2.2,2.6,2.7和倒F天线单元2.3,2.4,2.5,2.8分别关于X轴对称。
每个倒F天线单元上均有一个馈电点3和接地点4，天线的接地点4通过金属化过孔与介质基板1顶层的金属地5相连接。
T型枝节6位于两个倒F天线单元之间，且T型枝节6两侧的倒F天线单元关于T型枝节6对称。
介质基板1的外侧还设置有金属外壳，金属外壳为包括背壳和边框的上开口结构，金属外壳与介质基板之间存在一定的间隙。背壳上还设置有两个平行于Y轴的矩形槽，且两个矩形槽关于Y轴对称。
下面通过具体实施例对本发明的技术方案作进一步阐述，其中，本实施例的介质基板按照相对介电常数为2.65、厚度为2毫米，介质基板与金属外壳的距离为0.3mm。
对照附图3、图4和图5，其中，S11表示倒F天线单元2.1的馈电端口3的反射系数，S55表示倒F天线单元2.5的馈电端口的反射系数，S12表示倒F天线单元2.1的馈电端口与2.2的馈电端口之间的传输系数，S16表示倒F天线单元2.1的馈电端口与2.6的馈电端口之间的传输系数，S17表示倒F天线单元2.1的馈电端口与2.7的馈电端口之间的传输系数，S54表示倒F天线单元2.5的馈电端口与2.4的馈电端口之间的传输系数，S56表示倒F天线单元2.5的馈电端口与2.6的馈电端口之间的传输系数，S57表示倒F天线单元2.5的馈电端口与2.7的馈电端口之间的传输系数，S58表示倒F天线单元2.5的馈电端口与2.8的馈电端口之间的传输系数.
从图3中我们可以看到，虚线所对应的S11的反射系数曲线和实线所对应的S55的反射系数曲线重叠的阻抗匹配带宽为3.28GHz-3.53GHz。从图4中，我们可以看到在匹配带宽内传输系数小于-10dB。同样图5中，我们可以看出在天线单元的阻抗匹配带宽内，天线单元的传输系数均小于-10dB。
综上所述，该便携式终端在很小的尺寸下通过极化正交和添加T型枝节保证了各天线单元之间较小的耦合程度，同时通过在金属背壳中部适当的位置开缝改善了天线单元的阻抗匹配问题。再有该终端天线有着较高的效率，简单的结构和较小的体积等特点，使得该天线拥有十分广泛的应用范围。
本发明对于介质基板左段和右端的四个单元的极化方式与中部四个单元的极化方式正交，而左端两个同极化单元和右端两个同极化单元以及中部四个同极化的单元采用在地上加T型枝节的方法来实现8单元之间都保持较好的隔离度。另一方面终端使用金属外壳后，天线的匹配就会恶化，本设计采用在金属背壳合适的地方开缝，以实现良好的匹配。
本发明将提出一种金属外壳物联网便携式的多天线终端的设计方法，在采用金属外 壳的情况下八个天线单元都有很好的匹配，且相互之间都有很高的隔离度。另外，设计外壳为金属材质的物联网便携式终端是符合当下潮流的。
本技术领域技术人员可以理解的是，除非另外定义，这里使用的所有术语(包括技术术语和科学术语)具有与本发明所属领域中的普通技术人员的一般理解相同的意义。还应该理解的是，诸如通用字典中定义的那些术语应该被理解为具有与现有技术的上下文中的意义一致的意义，并且除非像这里一样定义，不会用理想化或过于正式的含义来解释。
以上所述，仅为本发明中的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉该技术的人在本发明所揭露的技术范围内，可理解想到的变换或替换，都应涵盖在本发明的包含范围之内，因此，本发明的保护范围应该以权利要求书的保护范围为准。

Claims (5)

  1. 一种金属外壳的物联网便携式多天线终端，其特征在于，包括介质基板、第一至第八倒F天线单元、第一至第四T形枝节以及金属外壳；
    其中，第一至第八倒F天线单元分别两两设置在介质基板的下表面的四个边缘，且关于介质基板的两条对称轴对称；
    第一至第四T形枝节分别设置在介质基板的上表面的四个边缘，每个T形枝节在介质基板下表面的投影位于两个倒F天线单元之间，且两个倒F天线单元关于两者之间的T形枝节对称；
    介质基板的上表面还设置有一个金属接地板，金属接地板分别与第一至第四T形枝节连接，且金属接地板在介质基板下表面的投影与第一至第八倒F天线单元不重叠；
    第一至第八倒F天线单元的接地点分别通过金属化过孔与金属接地板连接；
    金属外壳设置在介质基板的外侧，，与介质基板之间存在间隙；金属外壳包括背壳和边框，背壳上还设置有两个平行的矩形槽，两个矩形槽关于介质基板长边方向对折线对称，且两个矩形槽在介质基板下表面的投影与倒F天线单元重叠。
  2. 根据权利要求1所述的一种金属外壳的物联网便携式多天线终端，其特征在于，在金属外壳的背壳的一对短边处分别开有两个环形槽。
  3. 根据权利要求2所述的一种金属外壳的物联网便携式多天线终端，其特征在于，在边框的两个长边的两端分别开槽，分别与背壳上的两个环形槽连通。
  4. 根据权利要求3所述的一种金属外壳的物联网便携式多天线终端，其特征在于，背壳上两个环形槽以及边框上的开槽均采用非金属物质填充。
  5. 根据权利要求1所述的一种金属外壳的物联网便携式多天线终端，其特征在于，该天线终端关于介质基板的两条对称轴均对称。
PCT/CN2017/080458 2017-03-20 2017-04-13 一种金属外壳的物联网便携式多天线终端 Ceased WO2018170967A1 (zh)

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