WO2010072095A1 - 一种改善无线数据终端设备无线性能的方法及设备 - Google Patents

一种改善无线数据终端设备无线性能的方法及设备 Download PDF

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Publication number
WO2010072095A1
WO2010072095A1 PCT/CN2009/074272 CN2009074272W WO2010072095A1 WO 2010072095 A1 WO2010072095 A1 WO 2010072095A1 CN 2009074272 W CN2009074272 W CN 2009074272W WO 2010072095 A1 WO2010072095 A1 WO 2010072095A1
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WIPO (PCT)
Prior art keywords
usb interface
terminal device
data terminal
wireless data
circuit board
Prior art date
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PCT/CN2009/074272
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English (en)
French (fr)
Inventor
谢艳萍
孙树辉
占奇志
龚树强
张朝燕
Original Assignee
华为终端有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为终端有限公司 filed Critical 华为终端有限公司
Priority to EP09180445.0A priority Critical patent/EP2199920B1/en
Priority to JP2009291142A priority patent/JP4865850B2/ja
Priority to US12/645,192 priority patent/US8335087B2/en
Publication of WO2010072095A1 publication Critical patent/WO2010072095A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/71—Coupling devices for rigid printing circuits or like structures
    • H01R12/72—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures
    • H01R12/722—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures coupling devices mounted on the edge of the printed circuits
    • H01R12/724—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures coupling devices mounted on the edge of the printed circuits containing contact members forming a right angle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/77—Coupling devices for flexible printed circuits, flat or ribbon cables or like structures
    • H01R12/79—Coupling devices for flexible printed circuits, flat or ribbon cables or like structures connecting to rigid printed circuits or like structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/50—Fixed connections
    • H01R12/59—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures
    • H01R12/62—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures connecting to rigid printed circuits or like structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0274—Details of the structure or mounting of specific components for an electrical connector module

Definitions

  • the present invention relates to a wireless data terminal device, and more particularly to a method and apparatus for improving the wireless performance of a wireless data terminal device. Background technique
  • a wireless data terminal device is a data device that can connect to the Internet using a wireless network connection, such as a 3G network data card, WIFI/WIMAX (Wireless Fidelity/Worldwide Interoperability for Microwave Access, Wireless Fidelity/Worldwide Interoperability for Interoperability) Data card, etc.
  • a wireless network connection such as a 3G network data card, WIFI/WIMAX (Wireless Fidelity/Worldwide Interoperability for Microwave Access, Wireless Fidelity/Worldwide Interoperability for Interoperability) Data card, etc.
  • WIFI/WIMAX Wireless Fidelity/Worldwide Interoperability for Microwave Access
  • Data card etc.
  • the structure of data cards has been improved from the original fixed structure to activities. Structure, this improvement allows the data interface's computer interface or antenna to shrink into the data card body when not in use, significantly reducing the size of the data card and eliminating
  • the data card is a wireless data terminal device
  • wireless performance is one of the important indicators to measure the performance of the data card
  • the connection effect between the data card and the computer has an important impact on the wireless performance of the data card.
  • the USB bus is the mainstream way to establish a connection between a data card and a computer.
  • the connector connected to the USB interface of the data card is changed from a fixed type to a mobile type, the wireless performance of the data card is greatly increased. influences.
  • the data card with fixed USB interface the USB plug is directly soldered to the main circuit board of the data card. Since the connection between the USB plug and the main circuit board is very reliable, the ground plane of the data card circuit can be reliably connected to the ground plane of the computer. Therefore, there is no significant impact on the wireless performance of the data card.
  • the data card of the fixed USB interface cannot continue to shrink, and a USB cap is required to protect the USB interface when the data card is not in use, which inevitably may result in the loss of the USB cap due to the loss of the USB card. Have a certain impact.
  • the USB interface is connected to the main circuit board through a single thin wire or FPC (Flexible Printed Circuit Board) soft board by means of a separate main circuit board and a USB interface, thereby realizing an active USB interface.
  • the data card of the mobile USB interface also has certain defects. On the one hand, due to the limitation of the data card volume and the bending life of the connecting material, it is impossible to connect the USB interface and the main circuit board connection line or the FPC soft board. Too large, so there is only a very narrow ground loop, so that the ground plane of the main circuit board of the data card cannot be effectively connected to the ground plane of the computer; on the other hand, the poor connection effect of the ground plane directly affects the wireless performance of the data card. .
  • Figure 1 is a schematic diagram of the operation of the antenna. From the basic theory of the antenna, the role of the antenna is to convert the electrical energy into an alternating electromagnetic field and radiate it into the space. Under the action of this alternating electromagnetic field, an electric field is formed on the ground plane around the antenna, and the direction of the electric field is directed to the antenna, as shown in Fig. 1. An important role played by the ground plane of the antenna is to return as much energy as possible through the electric field around the antenna to the antenna, supplementing the energy radiated by the antenna.
  • the ground plane of the wireless data terminal device When the antenna of the wireless data terminal device is in operation, the ground plane of the wireless data terminal device itself acts as a part of the antenna, acting as an energy reflow. Moreover, as the current wireless data terminal equipment is getting smaller and smaller, such as the size of data card products has reached the limit, the ground plane of the wireless data terminal equipment is insufficient to support the energy return of the antenna, and the current practice is to borrow other equipment.
  • the ground plane such as the ground plane of a computer, supports the work of the antenna of the wireless data terminal equipment, so the connection of the wireless data terminal equipment to the ground plane of other equipment becomes particularly important.
  • the connection between the wireless data terminal device and the computer is connected through a fixed USB interface, and the fixed USB interface is directly connected to the wireless device.
  • the ground plane of the data terminal equipment is directly connected to the ground plane on the computer side. Due to this fixation
  • connection surface of the ground plane of the USB interface is large enough, so the wireless data terminal equipment can well borrow the ground plane of the computer to realize the energy return.
  • the biggest problem with the USB interface split wireless data terminal device is that the USB interface is separated from the main circuit board and can only be connected to the main circuit board through a soft connection, that is, the ground plane of the USB interface and the wireless data terminal device. Only very thin and narrow conductors such as cords or FPC boards are connected. Unless this soft connection is wide, it is difficult to meet the energy return requirements of the antenna. However, this soft connection is also constrained by factors such as material, equipment space, layout, and life requirements, which is more difficult to achieve.
  • USB interface separate wireless data terminal device is difficult to meet the wireless performance when only one ground loop is connected to the USB interface and the ground plane. Moreover, this ground connection is also responsible for the return of the operating current of the device, and the various interferences are very serious, which further deteriorates the working environment of the antenna. Summary of the invention
  • the main purpose of the embodiments of the present invention is to provide a method and a device for improving the wireless performance of a wireless data terminal device, to solve the antenna energy return path and interference problem, and to reduce the wireless performance of the data card after the USB interface of the data card is changed to the active type.
  • the impact and improved wireless performance of the discrete USB interface data card is to provide a method and a device for improving the wireless performance of a wireless data terminal device, to solve the antenna energy return path and interference problem, and to reduce the wireless performance of the data card after the USB interface of the data card is changed to the active type.
  • a wireless data terminal device comprising a separate USB interface, the split USB interface and the wireless data terminal device comprising at least two ground connections, and the at least two grounded connections The locations are not adjacent.
  • a method of improving wireless performance of a wireless data terminal device comprising:
  • the method and the device for improving the wireless performance of the wireless data terminal device in the embodiment of the present invention effectively increase the connection between the ground plane of the wireless data terminal device and the computer ground plane through at least two non-adjacent ground points, and improve the wireless data terminal device.
  • FIG. 1 is a schematic diagram of the operation of an antenna in the prior art
  • FIG. 2A is a schematic diagram of a connection of a double-grounded USB interface without adding an embodiment according to an embodiment of the present invention
  • 2B is a schematic diagram of adding a wire connection USB interface and a main circuit board according to an embodiment of the present invention
  • 3A is a schematic diagram of a double-connected ground connection using an FPC soft board according to an embodiment of the present invention.
  • FIG. 3B is a schematic diagram of using a FPC soft board with dual ground connection according to an embodiment of the present invention. detailed description
  • the embodiment of the present invention provides a wireless data terminal device, which includes a separate USB interface.
  • a wireless data terminal device which includes a separate USB interface.
  • a wireless data terminal device with a separate USB interface has a grounded wire itself, but since its own grounding wire is only a very thin one, or although more than one but the connection points are adjacent, therefore, only Equivalent to a ground loop, the connection between the ground plane of the wireless data terminal equipment and the computer ground plane is actually very narrow, and it is difficult to meet the demand for energy reflow.
  • 2A and 2B are schematic diagrams showing a grounding line of a USB interface portion of a rotary USB interface wireless data terminal device.
  • the USB interface portion of the wireless data terminal device of the existing rotary USB interface does not increase double grounding. Due to the structure limitation of the volume and the rotary USB interface, the USB interface can only pass through the main circuit board. Thin wire or very narrow FPC soft board, and the trace is biased on one side of the USB interface. Although there are two ground GNDs as shown in Figure 2A, the connection points of the two ground wires on the main circuit board are Adjacent, actually only equivalent to one ground loop, so the connection between the ground plane of the wireless data terminal equipment and the computer ground plane is actually very narrow.
  • the USB interface part of the wireless data terminal device of the rotary USB interface of the embodiment adopts a double grounding setting, and a grounding wire undundance GND is added to the metal interface of the USB interface away from the original grounding point, and Connect to another ground point on the main board.
  • the USB interface and the main circuit board have two non-adjacent grounding points, forming two ground loops, which effectively increases the connection between the ground plane of the wireless data terminal equipment and the computer ground plane, thereby improving the wireless The wireless indicator of the data terminal equipment.
  • the selection of the Redundance GND ground point of Figure 2B can follow one or any combination of the following principles:
  • the side of the connector is spatially separated from the original grounding point by a certain distance, and is preferably directly connected to the ground plane of the computer, the closer to the ground plane of the computer, the better;
  • the grounding point on one side of the main circuit board is separated from the original grounding point by a certain distance
  • the wireless data terminal device of this embodiment in addition to the electrical grounding wire of the wireless data terminal device USB, uses an additional wire to connect the USB interface to the ground plane of the main circuit board of the wireless data terminal device.
  • the grounding point on the side of the USB interface in addition to the USB interface signal pin, also makes a second grounding point on the metal casing of the USB interface. This second grounding point is directly connected to the ground plane of the computer, and the two connection points are not in phase. adjacent.
  • connection point away from the USB bus signal on the PCB, and close to the USB is reserved for a relatively complete copper skin directly connected to the ground plane of the PCB, and is treated with bright copper as the second grounding point.
  • the two second grounding points are connected by a metal dome to form a Redundance GND, while ensuring that the USB connector is free to move.
  • This embodiment increases the redundant grounding of the USB interface of the wireless data terminal device, and increases the connection between the ground plane of the wireless data terminal device and the computer ground plane due to the separate setting, and increases the ground of the separate USB interface wireless data terminal device.
  • the reliability of the connection between the plane and the computer ground plane which improves the wireless index of the device, and solves the limitation of the space and the connection mode.
  • the ground plane of the main circuit board of the wireless data terminal device is too narrow to connect with the computer ground plane. Forming a ground plane large enough to cause a drop in wireless indicators.
  • the wireless radio frequency indicator (TRP, TIS, etc.) of the USB split terminal device is about 5 ⁇ 10dB in the low frequency band such as 900M and 850M, which is basically at the same level as the USB interface fixed terminal device.
  • the embodiment of the present invention further provides a wireless data terminal device, which includes a separate USB interface.
  • a wireless data terminal device which includes a separate USB interface.
  • 3A and 3B are schematic diagrams showing the grounding wire of the USB interface portion of the sliding USB interface wireless data terminal device.
  • the USB interface part of the wireless data terminal device of the existing sliding USB interface does not add double grounding
  • the USB interface is fixed on the PCB
  • the USB signal and the power source are led out through the FPC soft board
  • the USB interface can follow the PCB.
  • the board slides out of the device.
  • the ground plane connection between the USB interface and the main circuit board is only the bottom line of the FPC flexible board, although it can meet the current reflow requirement, but for the radio frequency, here is the ground plane and computer ground of the wireless data terminal equipment.
  • the bottleneck of the flat connection is only the bottom line of the FPC flexible board, although it can meet the current reflow requirement, but for the radio frequency, here is the ground plane and computer ground of the wireless data terminal equipment.
  • the USB interface part of the wireless data terminal device of the sliding USB interface of the embodiment adopts a double grounding setting, and a grounded USB metal shrapnel is extended on the main circuit board, and is connected to the USB connector. Above the metal case, so that the USB connector does not slide and expand Affects the activity of the USB connector. After actual tests, the wireless performance of the device has been greatly improved by adding the metal shrapnel to the ground loop.
  • USB metal shrapnel ground point of Figure 3B follows the following principles:
  • the side of the connector is spatially separated from the original grounding point by a certain distance, and is preferably directly connected to the ground plane of the computer, the closer to the ground plane of the computer, the better;
  • the grounding point on one side of the main circuit board is separated from the original grounding point by a certain distance
  • the metal casing of the USB interface is selected as the second grounding point on the USB interface side, and is not adjacent to the ground signal space of the USB bus. And is closely connected to the ground plane of the computer.
  • the shield cover of the main circuit board is selected as the second grounding point on the side of the main circuit board, which is not only far away from the original USB bus grounding point, but also has a complete plane and is closely connected with the ground plane of the main circuit and is reliable.
  • additional metal shrapnel is used to connect the USB interface metal casing to the second grounding point of the shield cover of the main circuit board of the wireless data terminal device to form Redundance GND.
  • This embodiment increases the redundant grounding of the USB interface of the wireless data terminal device, and increases the connection between the ground plane of the wireless data terminal device and the computer ground plane due to the separate setting, and increases the ground of the separate USB interface wireless data terminal device.
  • the reliability of the connection between the plane and the computer ground plane which improves the wireless index of the device, and solves the limitation of the space and the connection mode.
  • the ground plane of the main circuit board of the wireless data terminal device is too narrow to connect with the computer ground plane. Forming a ground plane large enough to cause a drop in wireless indicators.
  • the wireless radio frequency indicator (TRP, TIS, etc.) of the USB split terminal device is about 5 ⁇ 10dB in the low frequency band such as 900M and 850M, which is basically at the same level as the USB interface fixed terminal device.
  • the wireless data terminal device of the embodiment not only improves the grounding effect of the separate USB interface wireless data terminal device and the computer, but also improves the wireless performance of the separate USB interface wireless data terminal device, and the technology is simple and easy to implement, and the cost can be achieved. control.

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Abstract

一种无线数据终端设备，所述无线数据终端设备包括分离式 USB接口、主电路板，所述分离式 USB接口与所述主电路板之间包括至少两个冗余接地连接，且至少两个冗余接地连接的接地点之间不相邻。同时提供一种改善无线数据终端设备无线性能的方法。通过该无线数据终端设备或改善无线数据终端设备无线性能的方法，有效增加了无线数据终端设备地平面与计算机地平面的连接，改善了无线数据终端设备的无线指标。

Description

一种改善无线数据终端设备无线性能的方法及设备 本申请要求 2008年 12月 22日递交的申请号为 200820183210.9、 发明 名称为 "一种改善无线数据终端设备的无线性能的设备" 的中国专利申请的 优先权， 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及无线数据终端设备， 尤其涉及一种改善无线数据终端设备无 线性能的方法及设备。 背景技术
无线数据终端设备是指能够利用无线网络连接， 接上互联网的数据设 备， 例如 3G 网络数据卡、 WIFI/WIMAX ( Wireless Fidelity/Worldwide Interoperability for Microwave Access , 无线保真 /全球微波接入互操作性） 数 据卡等。 近几年， 随着人们对电子产品要求的不断提升， 数据卡的体积、 功 耗、 速度等指标都在不断改进以满足市场要求， 例如， 数据卡的结构从原来 的固定式结构改进为了活动式结构， 这种改进使数据卡的计算机接口或者天 线可以在不使用时收缩到数据卡体内， 明显缩小了数据卡的体积， 并消除了
USB帽等易丢附件对数据卡的影响。
由于数据卡是一种无线数据终端设备， 无线性能是衡量数据卡性能优劣 的重要指标之一， 而数据卡与计算机连接效果对数据卡的无线性能有着重要 的影响。 目前， USB 总线是数据卡和计算机之间建立连接的主流方式， 而 当数据卡与计算机 USB接口相连的连接器从固定式改为活动式后， 对数据 卡的无线性能带来了很大的影响。
发明人在实现本发明的过程中， 发现现有技术中存在如下问题： 采用固定 USB接口的数据卡， 其 USB插头直接焊接在数据卡的主电路 板上， 由于 USB插头与主电路板的连接十分可靠， 可以使数据卡电路的地 平面与计算机的地平面可靠的相连， 所以对数据卡无线性能不会造成很大影 响。 然而， 由于受 USB接口的体积和布局限制， 固定式 USB接口的数据卡 无法继续缩小， 并且在数据卡不用时需要一个 USB帽保护 USB接口， 不可 避免地将可能因 USB帽丢失而对数据卡造成一定影响。
采用数据卡主电路板与 USB接口分离的方式， 通过单根细导线或 FPC (Flexible Printed Circuit board, 柔性印刷电路板） 软板把 USB接口和主电 路板相连， 实现了活动 USB接口。 而这种活动式 USB接口的数据卡， 也存 在一定的缺陷， 一方面， 由于受数据卡体积和连接材料弯折寿命的限制， 连 接 USB接口和主电路板的连接线或 FPC软板不可能太大， 因而只有一个很 窄的地回路， 从而无法把数据卡主电路板的地平面与计算机的地平面有效相 连； 另一方面， 地平面的连接效果差也直接影响了数据卡的无线性能。
图 1为天线工作示意图， 从天线的基本理论可知， 天线的作用是把电能 转换为交变的电磁场， 并辐射到空间去。 在这个交变电磁场的作用下， 天线 周围的地平面上会形成一个电场， 电场方向指向天线， 如图 1所示。 天线的 地平面所充当的一个重要作用就是使尽可能多的能量通过天线周围的电场回 流到天线， 补充天线辐射出去的能量。
当无线数据终端设备的天线在工作时， 无线数据终端设备本身的地平面 就作为天线的一部分， 起能量回流的作用。 而且由于现在的无线数据终端设 备体积越来越小， 如数据卡类产品的体积已经趋于极限， 无线数据终端设备 的地平面已经不足以支撑天线的能量回流， 现在的做法都是借用其他设备的 地平面， 如计算机的地平面， 以支撑无线数据终端设备天线的工作， 所以无 线数据终端设备与其他设备地平面的连接变得尤为重要。
USB接口分离式无线数据终端设备出现前， 无线数据终端设备与计算 机的连接是通过固定的 USB接口连接的， 这种固定 USB接口直接接在无线 数据终端设备的地平面上， 与计算机侧的地平面直接相连。 由于这种固定
USB接口地平面的连接面足够大， 所以无线数据终端设备可以很好地借用 计算机的地平面实现能量的回流。 而 USB接口分离式无线数据终端设备最 大的问题就在于 USB接口与主电路板是分离的， 只能通过软连接方式连接 到主电路板上， 也就是说 USB接口与无线数据终端设备的地平面只有软线 或 FPC软板等很细很窄的导体相连。 除非这个软连接很宽， 否则很难满足 天线的能量回流要求。 但这个软连接同时还受材料、 设备空间、 布局、 寿命 要求等因素约束， 较难做到更宽。 所以 USB接口分离式无线数据终端设备 在只有一个地回路连接 USB接口和地平面时， 无线性能较难满足要求。 而 且这个地连接同时还担负着设备工作电流的回流， 各种干扰十分严重， 这也 进一步恶化了天线的工作环境。 发明内容
本发明实施例的主要目的在于提供一种改善无线数据终端设备无线性能 的方法及设备， 以解决天线能量回流路径和干扰问题， 减小数据卡的 USB 接口改为活动式后给数据卡无线性能带来的影响， 并改善分离式 USB接口 数据卡的无线性能。
本发明实施例的上述目的是通过如下技术方案实现的：
一种无线数据终端设备， 该无线数据终端设备包括一个分离式 USB接 口， 所述分离式 USB接口与所述无线数据终端设备之间包括至少两个接地 连接， 且所述至少两个接地的接地点之间不相邻。
一种改善无线数据终端设备无线性能的方法， 该方法包括：
在无线数据终端设备的分离式 USB接口上， 设置互不相邻的至少两个 接地点； 在所述无线数据终端设备的主电路板上， 设置互不相邻的至少两个 接地点； 将所述分离式 USB接口上的接地点与所述主电路板上的接地点两 两相连。 本发明实施例的改善无线数据终端设备无线性能的方法及设备通过至少 两个不相邻的接地点， 有效增加了无线数据终端设备地平面与计算机地平面 的连接， 改善了无线数据终端设备的无线指标。 附图说明
此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部 分， 并不构成对本发明的限定。 在附图中：
图 1为现有技术中天线工作示意图；
图 2A为本发明实施例中未增加双接地 USB接口连接示意图；
图 2B为本发明实施例中增加一根导线连接 USB接口与主电路板示意 图；
图 3 A为本发明实施例中使用 FPC软板无双接地连线示意图；
图 3B为本发明实施例中使用 FPC软板带双接地连线示意图。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚明白， 下面结合实 施例和附图， 对本发明实施例做进一步详细说明。 在此， 本发明的示意性实 施例及其说明用于解释本发明， 但并不作为对本发明的限定。
实施例一
本发明实施例提供一种无线数据终端设备， 该无线数据终端设备包括一 个分离式 USB接口， 以下结合附图对本实施例进行详细说明。
一般情况下， 具有分离式 USB接口的无线数据终端设备本身就具有接 地的导线， 但由于其本身的接地导线只有很细的一根， 或者虽不止一根但连 接点相邻， 因此， 实际只等效于一个地回路， 所以无线数据终端设备地平面 与计算机地平面的连接实际还是很窄， 很难满足能量回流的需求。 图 2A、 图 2B为旋转式 USB接口无线数据终端设备的 USB接口部分的 接地线示意图。
如图 2A所示， 现有的旋转式 USB接口的无线数据终端设备的 USB接 口部分未增加双接地， 由于受体积和旋转式 USB接口的结构限制， USB接 口连到主电路板只能通过几根细导线或很窄的 FPC软板， 并且走线偏在 USB接口的一边， 虽然从图 2A中看地线 GND有两根， 但是由于这两根地 线在主电路板上的连接点都是相邻的， 实际只等效于一个地回路， 所以无线 数据终端设备地平面与计算机地平面的连接实际还是很窄。
如图 2B所示， 本实施例的旋转式 USB接口的无线数据终端设备的 USB接口部分采用了双接地设置， 在 USB接口金属外壳上远离原有接地点 处增加一个接地的导线 redundance GND, 并且连接到主电路板另外一个接 地点。 这样使 USB接口和主电路板都有两个不相邻的接地点， 形成两个地 回路， 有效地增大了无线数据终端设备地平面与计算机地平面的连接， 从而 很好的改善了无线数据终端设备的无线指标。
一个实施例中， 图 2B的 Redundance GND接地点的选择可以遵循以下 原则之一或任意组合：
1. 接头一侧与原有接地点在空间上隔离一定距离， 并且最好与计算机 的地平面直接相连， 离计算机地平面越接近越好；
2. 主电路板一侧的接地点与原有接地点隔离一定距离；
3. 尽量选取较大、 较完整的地平面做连接点。
本实施例的无线数据终端设备， 除了无线数据终端设备 USB 的电气接 地线外， 采用额外的导线把 USB接口与无线数据终端设备主电路板的地平 面相连。 USB接口一侧的接地点除了 USB接口信号管脚外， 还在 USB接口 的金属外壳上做第二个接地点， 这第二个接地点与计算机地平面直接相连， 并且两个连接点不相邻。 同时， 使无线数据终端设备主电路板上除了 USB 总线的信号地以外， 在 PCB上远离 USB总线信号地连接点， 并且靠近 USB 接口的地方保留一个与 PCB地平面直接相连且较完整的铜皮， 并做亮铜处 理， 作为第二接地点。 两个第二接地点之间通过一个金属弹片相连， 形成 Redundance GND， 同时保证 USB接头活动自如。
本实施例增加了无线数据终端设备的 USB接口的冗余接地， 且因分离 设置， 增大了无线数据终端设备地平面与计算机地平面的连接， 增加了分离 式 USB接口无线数据终端设备的地平面与计算机地平面的连接的可靠性， 从而很好地改善了设备的无线指标， 解决了由于空间和连接方式的限制， 无 线数据终端设备主电路板地平面与计算机地平面连接太窄， 无法形成一个足 够大的地平面而导致无线指标下降的问题。 经过对比， 增加 Redundance GND后， USB分离式终端设备的无线射频指标 （TRP， TIS等） 在 900M, 850M等低频段大概有 5〜10dB的提升， 基本与 USB接口固定式终端设备 处于同一水平。
实施例二
本发明实施例还提供一种无线数据终端设备， 该无线数据终端设备包括 一个分离式 USB接口， 以下结合附图对本实施例进行详细说明。
图 3A、 图 3B为滑动式 USB接口无线数据终端设备的 USB接口部分的 接地线示意图。
如图 3A所示， 现有的滑动式 USB接口的无线数据终端设备的 USB接 口部分未增加双接地， USB接口固定在 PCB上， USB信号和电源通过 FPC 软板引出， USB接口可以随着 PCB板的滑动而伸出设备外。 从图 3A中可 见， USB接口与主电路板的地平面连接只有 FPC软板上的底线， 虽然能满 足电流的回流需求， 但对于无线射频来讲， 这里是无线数据终端设备地平面 与计算机地平面连接的瓶颈。
如图 3B所示， 本实施例的滑动式 USB接口的无线数据终端设备的 USB接口部分采用了双接地设置， 在主电路板上伸出一个接地的 USB金属 弹片， 搭接在 USB连接头的金属外壳的上方， 使 USB接头在滑动伸缩时不 影响 USB接头的活动。 经过实际测试表明， 加上金属弹片这个地回路后， 设备的无线性能得以大幅提高。
一个实施例中， 图 3B 的 USB金属弹片接地点的选择要遵循以下原 则：
1. 接头一侧与原有接地点在空间上隔离一定距离， 并且最好与计算机 的地平面直接相连， 离计算机地平面越接近越好；
2. 主电路板一侧的接地点与原有接地点隔离一定距离；
3. 尽量选取较大， 较完整的地平面做连接点。
本实施例的无线数据终端设备， 除了无线数据终端设备 USB 的电气接 地线外， 在 USB接口一侧选取 USB接口的金属外壳作为第二接地点， 与 USB 总线的地信号空间上不相邻， 并且与计算机地平面的紧密相连。 在主 电路板一侧选取主电路板的屏蔽盖作为第二接地点， 不但远离原有的 USB 总线接地点， 而且平面完整， 与主电路地平面连接紧密， 可靠。 最后采用额 外的金属弹片把 USB接口金属外壳与无线数据终端设备主电路板屏蔽盖的 第二接地点相连， 形成 Redundance GND。
本实施例增加了无线数据终端设备的 USB接口的冗余接地， 且因分离 设置， 增大了无线数据终端设备地平面与计算机地平面的连接， 增加了分离 式 USB接口无线数据终端设备的地平面与计算机地平面的连接的可靠性， 从而很好地改善了设备的无线指标， 解决了由于空间和连接方式的限制， 无 线数据终端设备主电路板地平面与计算机地平面连接太窄， 无法形成一个足 够大的地平面而导致无线指标下降的问题。 经过对比， 增加 Redundance GND后， USB分离式终端设备的无线射频指标 （TRP， TIS等） 在 900M, 850M等低频段大概有 5〜10dB的提升， 基本与 USB接口固定式终端设备 处于同一水平。 通过本实施例的无线数据终端设备， 不仅改善了分离式 USB接口无线 数据终端设备与计算机的接地效果， 且改善了分离式 USB接口无线数据终 端设备的无线性能， 技术实现简单易行、 成本可控。
以上所述的具体实施例， 对本发明的目的、 技术方案和有益效果进行了 进一步详细说明， 所应理解的是， 以上所述仅为本发明的具体实施例而已， 并不用于限定本发明的保护范围， 凡在本发明的精神和原则之内， 所做的任 何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种无线数据终端设备， 该无线数据终端设备包括分离式 USB接 口、 主电路板， 其特征在于， 所述分离式 USB接口与所述主电路板之间包 括至少两个接地连接， 且所述至少两个接地连接的接地点之间不相邻。
2、 根据权利要求 1所述的无线数据终端设备， 其特征在于， 所述分离 式 USB接口与所述主电路板通过导线连接。
3、 根据权利要求 2所述的无线数据终端设备， 其特征在于， 所述接地 连接的至少一个为单根导线， 该单根导线的一端连接于所述分离式 USB接 口的金属外壳上， 另一端连接所述主电路板的另一个接地点。
4、 根据权利要求 2所述的无线数据终端设备， 其特征在于， 所述分离 式 USB接口为旋转式 USB接口。
5、 根据权利要求 1所述的无线数据终端设备， 其特征在于， 所述 USB 接口与所述主电路板通过 FPC软板连接。
6、 根据权利要求 5所述的无线数据终端设备， 其特征在于， 所述接地 连接的至少一个为金属弹片， 该金属弹片连接于所述 USB连接头的金属外 壳的上方， 不同于所述 USB连接头活动的位置， 且该金属弹片连接所述主 电路板的另一个接地点。
7、 根据权利要求 5所述的无线数据终端设备， 其特征在于， 所述分离 式 USB接口为滑动式 USB接口。
8、 一种改善无线数据终端设备无线性能的方法， 其特征在于， 该方法 包括：
在无线数据终端设备的分离式 USB接口上， 设置互不相邻的至少两个 接地点；
在所述无线数据终端设备的主电路板上， 设置互不相邻的至少两个接地 点； 将所述分离式 USB接口上的接地点与所述主电路板上的接地点两两相 连。
9、 如权利要求 8所述的方法， 其特征在于， 在无线数据终端设备的分 离式 USB接口上， 设置互不相邻的至少两个接地点， 包括：
除 USB信号管脚的接地点外， 在所述分离式 USB接口的金属外壳上设 置与计算机地平面直接相连的接地点， 且该接地点与所述 USB信号管脚的 接地点不相邻；
在所述无线数据终端设备的主电路板上， 设置互不相邻的至少两个接地 点， 包括：
除 USB总线的接地点外， 在所述主电路板上远离所述 USB总线、 且靠 近所述分离式 USB接口处， 设置与所述主电路板地平面直接相连的接地 点。
10、 如权利要求 9所述的方法， 其特征在于， 将所述分离式 USB接口 上的接地点与所述主电路板上的接地点两两相连， 包括：
将所述 USB信号管脚的接地点与所述 USB总线的接地点相连； 以及， 将所述分离式 USB接口的金属外壳上设置的接地点、 与在所述主电路 板上设置的与所述主电路板地平面直接相连的接地点相连。
11、 如权利要求 8所述的方法， 其特征在于， 在无线数据终端设备的分 离式 USB接口上， 设置互不相邻的至少两个接地点， 包括：
除 USB电气接线的接地点外， 将所述分离式 USB接口的金属外壳设置 为与计算机地平面直接相连的接地点， 且该接地点与所述 USB 电气接线的 接地点不相邻；
在所述无线数据终端设备的主电路板上， 设置互不相邻的至少两个接地 点， 包括：
除 USB 总线的接地点外， 将所述主电路板的屏蔽盖设置为远离所述
USB总线、 且与所述主电路板地平面直接相连的接地点。
12、 如权利要求 11所述的方法， 其特征在于， 将所述分离式 USB接口 上的接地点与所述主电路板上的接地点两两相连， 包括：
将所述 USB电气接线的接地点与所述 USB总线的接地点相连； 以及， 将所述分离式 USB接口的金属外壳与在所述主电路板的屏蔽盖相连。
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