WO2012071967A1 - 一种五频段的内置天线及其移动通信终端 - Google Patents

一种五频段的内置天线及其移动通信终端 Download PDF

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Publication number
WO2012071967A1
WO2012071967A1 PCT/CN2011/081835 CN2011081835W WO2012071967A1 WO 2012071967 A1 WO2012071967 A1 WO 2012071967A1 CN 2011081835 W CN2011081835 W CN 2011081835W WO 2012071967 A1 WO2012071967 A1 WO 2012071967A1
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WIPO (PCT)
Prior art keywords
slot
frequency branch
circuit board
printed circuit
antenna
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PCT/CN2011/081835
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English (en)
French (fr)
Inventor
张莲
Original Assignee
惠州Tcl移动通信有限公司
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Application filed by 惠州Tcl移动通信有限公司 filed Critical 惠州Tcl移动通信有限公司
Priority to US13/816,217 priority Critical patent/US9385429B2/en
Priority to EP11845426.3A priority patent/EP2648278B1/en
Publication of WO2012071967A1 publication Critical patent/WO2012071967A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0414—Substantially flat resonant element parallel to ground plane, e.g. patch antenna in a stacked or folded configuration
    • 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
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in 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
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/245—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H01Q5/385—Two or more parasitic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element

Definitions

  • the present invention relates to the field of wideband antennas for wireless communication devices, and more particularly to improvements in a five-band internal antenna and its mobile communication terminal.
  • antennas of smaller size are always required in the future.
  • the original external antenna a device that protrudes from the outer casing for a short period of time.
  • Such an external antenna has the disadvantage that it is sensitive to mechanical structures and is easily broken. Therefore, from a design point of view, the antenna should be hidden or integrated as much as possible in the housing of the communication device.
  • Such a built-in antenna or integrated antenna must be able to cover the total bandwidth of each radio channel in its place.
  • communication standards of various standards require integrated antenna coverage frequencies ranging from 824MHz to 2170MHz; this is especially the case for handheld communication terminals, which may cause the antenna to generate resonance intensities of different intensities during a call due to hand-held communication.
  • the position of the terminal in the user's hand is different; and this resonance frequency offset must be compensated by the bandwidth, that is, the bandwidth of the antenna is wider than the required frequency band to compensate for the loss due to the resonance frequency offset.
  • the wideband antennas tend to satisfy the loss caused by the resonance frequency offset when the geometrical size is relatively large, but this obviously runs counter to the miniaturization direction of the mobile communication terminal.
  • a five-band internal antenna comprising: a first high frequency branch, a second high frequency branch and a low frequency branch of the antenna radiating unit, and a first slot disposed on the printed circuit board And a second slot; the first slot is disposed in a direction perpendicular to the current of the printed circuit board; the open end of the low frequency branch is adapted to be in the first slot; and the open end of the second high frequency branch is adapted to the second slot In the hole.
  • the five-band internal antenna wherein: the printed circuit board has a rectangular shape; the grounding leg of the antenna radiating unit and the feeding leg are disposed along a long side of the rectangle; and the first slot is disposed along a short side of the rectangle.
  • the five-band internal antenna wherein: the second slot is disposed along a short side of the rectangle.
  • the five-band internal antenna wherein: the open end of the first slot is disposed on a long side of a rectangle away from a grounding leg of the antenna radiating unit and a side of the feeding leg.
  • the five-band internal antenna wherein the open end of the second slot is located on the same long side of the rectangle as the open end of the first slot.
  • the five-band internal antenna wherein: the length of the first slot is smaller than the length of the short side of the rectangle.
  • the five-band internal antenna wherein: the length of the second slot is smaller than the length of the first slot.
  • the five-band internal antenna wherein: the first high frequency branch and the second high frequency branch are respectively located at two sides of the grounding pin and the feeding leg; the first high frequency branch and the low frequency branch are both located at the grounding pin and the feeding leg The same side.
  • the five-band internal antenna wherein: an extending direction of the first high-frequency branch open end and a second high-frequency branch open end extending direction are perpendicular to each other.
  • a mobile communication terminal includes a housing and a printed circuit board and an internal antenna disposed in the housing; wherein the internal antenna includes: a first high frequency branch, a second high frequency branch, and a low frequency branch of the antenna radiating unit, and is disposed in the printing a first slot and a second slot on the circuit board; the first slot is disposed in a direction perpendicular to the current of the printed circuit board; the open end of the low frequency branch is adapted to be in the first slot; the second high frequency branch The open end is fitted in the second slot.
  • the utility model provides a five-band internal antenna and a mobile communication terminal thereof, wherein a slot (including a first slot and a second slot) is added on a printed circuit board to adjust a low frequency resonance mode thereof.
  • a slot including a first slot and a second slot
  • the low-frequency branch capacitive coupling of the antenna excites the printed circuit board to generate resonance, thereby expanding the low-frequency bandwidth of the antenna; and simultaneously exciting the second slot through the second high-frequency branch capacitive coupling of the antenna Resonance, together with the resonance of the first high-frequency branch in parallel and the resonance of the second high-frequency branch itself, form a new high-frequency bandwidth, thereby expanding the high-frequency bandwidth; the expanded high-low frequency bandwidth also compensates for the user
  • the influence of the frequency offset generated by the handheld optimizes the characteristics of the mobile communication terminal in the handheld mode; thereby achieving relatively large bandwidth characteristics in a limited space, and meeting the development requirements of miniaturization of the mobile communication terminal.
  • FIG. 1 is a schematic perspective view of a five-band internal antenna of the present invention.
  • FIG. 2 is a schematic plan view showing the planar structure of the five-band internal antenna of the present invention in a PCB board portion.
  • FIG. 3 is a perspective view showing the structure of an antenna radiating unit of the five-band internal antenna of the present invention.
  • FIG. 4 is a graph showing a return loss test curve of the five-band internal antenna of the present invention.
  • a five-band internal antenna of the present invention includes: a first high frequency branch 170, a second high frequency branch 180, and a low frequency branch 120 of the antenna radiating unit, and a distribution
  • the current phase is disposed in a vertical direction; the open end of the low frequency branch 120 is fitted in the first slot 160; and the open end of the second high frequency branch 180 is fitted in the second slot 130.
  • the present invention also provides a mobile communication terminal including a housing and a printed circuit board 110 and an internal antenna disposed in the housing; wherein the internal antenna includes: a first high frequency branch of the antenna radiating unit 170, a second high frequency branch 180 and a low frequency branch 120, and a first slot 160 and a second slot 130 distributed on the printed circuit board 110; a first high frequency branch 170, a second high frequency branch 180, and a low frequency branch 120 is connected in parallel; the first slot 160 is disposed in a direction perpendicular to the current of the printed circuit board 110; the open end of the low frequency branch 120 is fitted in the first slot 160; the open end of the second high frequency branch 180 is adapted to In the second slot 130.
  • the internal antenna includes: a first high frequency branch of the antenna radiating unit 170, a second high frequency branch 180 and a low frequency branch 120, and a first slot 160 and a second slot 130 distributed on the printed circuit board 110; a first high frequency branch 170, a second high frequency branch 180, and
  • the five-band internal antenna provided by the present invention and the mobile communication terminal thereof adopt the slot on the printed circuit board 110 (including the first slot)
  • the hole 160 and the second slot 130) are adapted to adjust the low frequency resonance mode to be close to the center frequency of the low frequency branch 120 portion of the antenna, and the low frequency branch 120 of the antenna is capacitively coupled to excite the printed circuit board 110 to generate resonance, thereby expanding the antenna.
  • the second high frequency branch 180 of the antenna is capacitively coupled to excite the resonance of the second slot 130, and the resonance of the parallel first high frequency branch 170 itself and the resonance of the second high frequency branch 180 itself
  • the new high-frequency bandwidth expands the high-frequency bandwidth; the expanded high-low frequency bandwidth also compensates for the frequency offset caused by the user's hand-held, and optimizes the characteristics of the mobile communication terminal in the handheld mode;
  • the relatively large bandwidth characteristics are realized in the space, which satisfies the development requirements of miniaturization of mobile communication terminals.
  • the planar inverted F antenna includes: an antenna radiating unit.
  • the terminals of the first high frequency branch 170 and the second high frequency branch 180 are open-circuited and operate on a quarter-wavelength resonance.
  • the antenna radiating element is limited by the size of the mobile communication terminal, the bandwidth of its own resonance usually cannot meet the requirements of the wireless channel of various communication systems, especially in the low frequency band, and cannot cover GSM5850 and GSM900 at the same time, here GSM (Global System for Mobile Communications) means a global mobile communication system; therefore, in this case, the antenna radiating element can be regarded as an excitation unit for exciting the printed circuit board 110, and the advantage of the large size of the printed circuit board 110 makes it a low frequency band. Resonance mode.
  • GSM Global System for Mobile Communications
  • the printed circuit board 110 has a rectangular shape; the grounding leg 140 of the antenna radiating unit and the feeding leg are disposed along the long side of the rectangle; the first slot 160 is disposed along the short side of the rectangle. .
  • the radiation performance at the lower frequency band is also primarily determined by the longitudinal current of the printed circuit board 110. Therefore, changing the resonant frequency of the longitudinal current on the printed circuit board 110 to be closer to the center frequency of the low frequency band can improve the radiation efficiency on the one hand and increase the low frequency bandwidth on the other hand.
  • the first slot 160 can be loaded in a direction perpendicular to the longitudinal current to change the current flow direction, forcing a current to flow around the first slot 160, which is equivalent to lengthening the length of the longitudinal current.
  • the direction of the first slot 160 is parallel to the width direction of the printed circuit board 110, but the printed circuit board 110 is not completely cut off; at this time, the open end of the low frequency branch 120 penetrates into the interior of the first slot 160.
  • the cause of the excitation by the capacitive coupling is the longitudinal current of the circuit board.
  • the first slot 160 generates the resonance of the printed circuit board 110 under the excitation of the low frequency branch 120 of the antenna radiating element, and the resonance of the low frequency branch 120 itself is equivalent to two on the circuit.
  • the parallel connection of the resonant circuits can cover the GSM850 and GSM900 bands.
  • the open end of the first slot 160 is disposed on a long side of the rectangle away from the grounding leg 140 of the antenna radiating unit and the side of the feed 150; the length of the first slot 160 does not exceed the rectangle Short side length setting.
  • the length of the first slot 160 can be designed according to a quarter wavelength close to the high frequency band, a short circuit, and an open circuit, so that the quarter resonant frequency is located in the working frequency band of the high frequency band, and the Resonance helps increase high-bandwidth bandwidth, and its bandwidth can cover DCS1800 (Digital Cellular System at 1800MHz, 1800MHz Digital Cellular System) and PCS (Personal Communications System) Operating in the 1900MHz band, 1900MHz personal communication system) frequency band.
  • DCS1800 Digital Cellular System at 1800MHz, 1800MHz Digital Cellular System
  • PCS Personal Communications System
  • the second high frequency branch 180 of the antenna radiating element penetrates into the interior of the second slot 130, and the resonance of the second slot 130 is excited by capacitive coupling, which generates a resonance and a first high frequency branch 170 of the antenna radiating element, and
  • the resonance generated by the second high frequency branch 180 itself is formed in parallel, and its bandwidth can cover the requirements of the high frequency band, namely DCS, PCS and UMTS.
  • Band1, 2, 5, 8 bands, here UMTS Universal Mobile Telecommunications System
  • UMTS Universal Mobile Telecommunications System
  • the first high frequency branch 170 and the second high frequency branch 180 are respectively located at two sides of the grounding leg 140 and the feeding 150; the first high frequency branch 170 and the low frequency branch 120 are both located at the grounding pin 140. And the same side of the feed 150; the extending direction of the open end of the first high frequency branch 170 and the end extending direction of the open end of the second high frequency branch 180 are perpendicular to each other.
  • the second slot 130 can also be disposed along the short side of the rectangle; the open end of the second slot 130 and the open end of the first slot 160 can be located on the same long side of the rectangle;
  • the length of the two slots 130 is smaller than the length of the first slot 160.
  • the five-band internal antenna of the present invention can improve the bandwidth of the antenna by increasing the first slot 160 to modify the resonant mode of the printed circuit board 110, thereby increasing the low frequency bandwidth of the antenna.
  • the high frequency bandwidth of the antenna is improved by exciting the resonant mode of the second slot 130 itself.
  • the bandwidth performance of the low frequency antenna is substantially determined by the size of the printed circuit board 110, particularly the length. Due to the small size of the built-in antenna, the bandwidth covered by its own resonance is far from meeting the channel requirements of the communication system. However, the resonant mode of the printed circuit board 110 is closer to the intermediate frequency of the antenna low frequency, and the generated bandwidth is larger than the built-in antenna. The bandwidth of the antenna's own resonance.
  • effectively energizing the resonant mode of the printed circuit board 110 is an effective way to increase the low frequency bandwidth of the antenna. Opening the first slot 160 in a direction perpendicular to the current of the printed circuit board 110, extending the current path, can reduce the resonant frequency of the printed circuit board 110 to be closer to the center frequency of the low frequency, thereby improving the low frequency bandwidth of the built-in antenna.
  • the second slot 130 on the printed circuit board 110 can be equivalent to a quarter-wavelength slot antenna at a high frequency band.
  • the slot antenna acts as a parasitic element of the built-in antenna, and the resulting resonance improves the high frequency bandwidth of the antenna.
  • the antenna of the communication terminal device is radiated by the first slot 160 on the printed circuit board 110, the second slot 130, the second high-frequency branch 180 of the antenna radiating unit, and the antenna in a limited space.
  • the low frequency branch 120 of the unit effectively excites the resonance of the printed circuit board 110 and effects the high frequency parasitic elements of the first slot 160 and the second slot 130, improving the high and low frequency bandwidth of the antenna.
  • the use of slots in the printed circuit board 110 improves the low frequency and high frequency bandwidth of the internal antenna so that the bandwidth of the antenna can cover GSM850, EGSM900, DCS, PCS and UMTS In the band 1, 2, 5, and 8 bands, the expanded bandwidth compensates for the frequency offset caused by the handheld state, thereby optimizing the performance in the handheld state, and realizing the miniaturization and wideband of the portable wireless communication device.
  • test results show that, as shown in Figure 4, the five-band built-in antenna of the present invention does have sufficient bandwidth to satisfy GSM850, EGSM900, DCS, PCS and UMTS from its test curve of return loss. Band 1, 2, 5, 8 band requirements.
  • the above description is only the preferred embodiment of the present invention, and is not sufficient to limit the technical solutions of the present invention.
  • Those skilled in the art can, according to the spirit and principle of the present invention, The description is to add, subtract, replace, transform or improve, for example, the antenna radiating unit includes a single inverted F-type antenna, and all such additions, subtractions, replacements, transformations or improved technical solutions belong to the appended claims. The scope of protection required.

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Abstract

本发明公开了一种五频段的内置天线及其移动通信终端，内置天线包括：天线辐射单元的第一高频分支、第二高频分支和低频分支，以及设置在印刷电路板上的第一槽孔和第二槽孔；第一槽孔沿与印刷电路板电流相垂直的方向设置；低频分支的开路端适配在第一槽孔中；第二高频分支的开路端适配在第二槽孔中。由于采用了在印刷电路板上增加槽孔调整其低频谐振，使之接近低频分支中心频率，通过电容耦合激励印刷电路板产生谐振；通过电容耦合激励第二槽孔谐振，并与第一高频分支形成高频带宽；弥补了因用户手持所产生的频率偏移影响，优化了移动通信终端在手持模式下的特性；从而在有限的空间内实现了相对大的带宽特性，满足了移动通信终端小型化的发展需求。

Description

一种五频段的内置天线及其移动通信终端
技术领域
本发明涉及无线通讯装置的宽频天线领域，更具体的说，改进涉及的是一种五频段的内置天线及其移动通信终端。
背景技术
随着移动通信收发终端向小型化的发展，特别是移动电话的小型化，在将来总是需要尺寸更小的天线。在移动电话领域，最初的外置天线，即伸出外壳很短的一段装置。这种外置天线具有缺点在于，对机械结构较为敏感，容易折断。因此，从设计角度出发，天线应尽可能地隐藏或集成在通信装置的外壳中。这样的内置天线或集成天线必须在其位置上能够覆盖各无线电信道的总带宽。
目前，多种制式的通信标准要求集成天线覆盖频率范围从824MHz到2170MHz；对此特别是手持通信终端存在一定问题，即在通话期间可能导致天线产生不同强度的共振偏移，这是由于手持通信终端在使用者手中的位置不同所引起的；而这种共振频率偏移必须通过带宽补偿，即天线的带宽要比所需的频带更宽，以补偿由于共振频率偏移时所带来的损耗。而现有技术中，宽频带天线往往都是在其几何尺寸比较大的时候才能满足共振频率偏移时造成的损耗，但是，这明显与移动通信终端的小型化发展方向背道而驰。
因此，现有技术尚有待改进和发展。
发明内容
本发明的目的在于，提供一种五频段的内置天线及其移动通信终端，可在有限的空间内实现相对大的带宽特性，以满足无线通信终端小型化的发展需求。
本发明的技术方案如下：一种五频段的内置天线，其中，包括：天线辐射单元的第一高频分支、第二高频分支和低频分支，以及设置在印刷电路板上的第一槽孔和第二槽孔；第一槽孔沿与印刷电路板电流相垂直的方向设置；低频分支的开路端适配在第一槽孔中；第二高频分支的开路端适配在第二槽孔中。
所述的五频段的内置天线，其中：印刷电路板的形状呈长方形；天线辐射单元的接地脚与馈入脚的连线沿长方形的长边设置；第一槽孔沿长方形的短边设置。
所述的五频段的内置天线，其中：第二槽孔沿长方形的短边设置。
所述的五频段的内置天线，其中：第一槽孔的开口端设置在远离天线辐射单元的接地脚与馈入脚一侧的长方形的长边上。
所述的五频段的内置天线，其中：第二槽孔的开口端与第一槽孔的开口端位于长方形的同一长边上。
所述的五频段的内置天线，其中：第一槽孔的长度小于长方形的短边长度。
所述的五频段的内置天线，其中：第二槽孔的长度小于第一槽孔的长度。
所述的五频段的内置天线，其中：第一高频分支和第二高频分支分别位于接地脚和馈入脚的两侧；第一高频分支和低频分支均位于接地脚和馈入脚的同侧。
所述的五频段的内置天线，其中：第一高频分支开路端的延伸方向与第二高频分支开路的端延伸方向相互垂直设置。
一种移动通信终端，包括外壳以及设置在外壳内的印刷电路板和内置天线；其中，内置天线包括：天线辐射单元的第一高频分支、第二高频分支和低频分支，以及设置在印刷电路板上的第一槽孔和第二槽孔；第一槽孔沿与印刷电路板电流相垂直的方向设置；低频分支的开路端适配在第一槽孔中；第二高频分支的开路端适配在第二槽孔中。
本发明所提供的一种五频段的内置天线及其移动通信终端，由于采用了在印刷电路板上增加槽孔(包括第一槽孔和第二槽孔)，以调整其低频谐振模式，使之接近天线低频分支的中心频率，通过天线的低频分支电容耦合激励印刷电路板产生谐振，由此拓展了天线的低频带宽；同时，通过天线的第二高频分支电容耦合激励第二槽孔的谐振，与并联的第一高频分支自身的谐振以及第二高频分支自身的谐振共同形成新的高频带宽，由此拓展了高频带宽；拓展后的高低频带宽，也弥补了因用户手持所产生的频率偏移影响，优化了移动通信终端在手持模式下的特性；从而在有限的空间内实现了相对大的带宽特性，满足了移动通信终端小型化的发展需求。
附图说明
图1是本发明五频段内置天线的立体结构示意图。
图2是本发明五频段内置天线在PCB板部分的平面结构示意图。
图3是本发明五频段内置天线的天线辐射单元部分的立体结构示意图。
图4是本发明五频段内置天线的回波损耗测试曲线图。
具体实施方式
以下将结合附图，对本发明的具体实施方式和实施例加以详细说明，所描述的具体实施例仅用以解释本发明，并非用于限定本发明的具体实施方式。
本发明的一种五频段的内置天线，其具体实施方式之一，如图1所示，包括：天线辐射单元的第一高频分支170、第二高频分支180和低频分支120，以及分布在印刷电路板110上的第一槽孔160和第二槽孔130；第一高频分支170、第二高频分支180和低频分支120并联连接；第一槽孔160沿与印刷电路板110电流相垂直的方向设置；低频分支120的开路端适配在第一槽孔160中；第二高频分支180的开路端适配在第二槽孔130中。
基于上述五频段的内置天线，本发明还提出了一种移动通信终端，包括外壳以及设置在外壳内的印刷电路板110和内置天线；其中，内置天线包括：天线辐射单元的第一高频分支170、第二高频分支180和低频分支120，以及分布在印刷电路板110上的第一槽孔160和第二槽孔130；第一高频分支170、第二高频分支180和低频分支120并联连接；第一槽孔160沿与印刷电路板110电流相垂直的方向设置；低频分支120的开路端适配在第一槽孔160中；第二高频分支180的开路端适配在第二槽孔130中。
与现有技术中的宽频带天线及其移动通信终端相比，本发明所提供的五频段的内置天线及其移动通信终端，由于采用了在印刷电路板110上增加槽孔(包括第一槽孔160和第二槽孔130)，以调整其低频谐振模式，使之接近天线低频分支120部分的中心频率，通过天线的低频分支120电容耦合激励印刷电路板110产生谐振，由此拓展了天线的低频带宽；同时，通过天线的第二高频分支180电容耦合激励第二槽孔130的谐振，与并联的第一高频分支170自身的谐振以及第二高频分支180自身的谐振共同形成新的高频带宽，由此拓展了高频带宽；拓展后的高低频带宽，也弥补了因用户手持所产生的频率偏移影响，优化了移动通信终端在手持模式下的特性；从而在有限的空间内实现了相对大的带宽特性，满足了移动通信终端小型化的发展需求。
以平面倒F型天线作为天线辐射单元为例，在本发明五频段的内置天线及其移动通信终端的优选实施方式中，如图1所示，平面倒F型天线包括：天线辐射单元的第一高频分支170，天线辐射单元的第二高频分支180，以及天线辐射单元的低频分支120。第一高频分支170和第二高频分支180的终端开路设置，其工作原理是四分之一波长谐振。因为天线辐射单元的尺寸受限于移动通信终端体积的限制，其本身谐振的带宽通常无法满足多种通信制式对无线信道的需求，特别在低频段，无法同时覆盖GSM5850和GSM900，此处的GSM(Global System for Mobile Communications)意思是全球移动通讯系统；因此，在此情况下，可将天线辐射单元看作一个激励印刷电路板110的激励单元，并利用印刷电路板110尺寸较大的优势，使其成为低频段的谐振模式。
优选地，如图2所示，印刷电路板110的形状呈长方形；天线辐射单元的接地脚140与馈入脚的连线沿长方形的长边设置；第一槽孔160沿长方形的短边设置。
因为印刷电路板110上的纵向电流，即沿该长方形的长度方向的电流，往往具有较高的辐射效率，而低频段的辐射性能也主要由印刷电路板110的纵向电流决定。所以改变印刷电路板110上的纵向电流的谐振频率，使之更接近低频段的中心频率，一方面可以提高辐射效率，另一方面还可以增加低频的带宽。
具体的，可在与纵向电流相垂直的方向上加载第一槽孔160，改变电流流向，强迫电流环绕第一槽孔160流过，等效于加长了纵向电流的长度。例如，将第一槽孔160的方向与印刷电路板110的宽度方向相平行设置，但并不完全截断印刷电路板110；此时，低频分支120的开路端深入到第一槽孔160的内部，通过电容耦合激励起因是电路板的纵向电流，第一槽孔160在天线辐射单元的低频分支120激励下产生印刷电路板110的谐振，与低频分支120自身的谐振在电路上等效为两个谐振电路的并联，其带宽可以覆盖GSM850和GSM900频段。
进一步地，如图2所示，第一槽孔160的开口端设置在远离天线辐射单元的接地脚140与馈入150一侧的长方形的长边上；第一槽孔160的长度不超过长方形的短边长度设置。
具体的，第一槽孔160的长度可按照接近于高频段的四分之一波长设计，一段短路，一段开路，使其四分之一谐振频率位于高频段的工作频带内，由其产生的谐振帮助增加高频段带宽，其带宽可以覆盖DCS1800(Digital Cellular System at 1800MHz，1800MHz数字蜂窝系统)和PCS(Personal Communications System operating in the 1900MHz band，1900MHz个人通讯系统)频段。
而天线辐射单元的第二高频分支180深入到第二槽孔130的内部，通过电容耦合激励第二槽孔130的谐振，其产生的谐振与天线辐射单元的第一高频分支170，以及第二高频分支180自身产生的谐振形成并联，其带宽可以覆盖高频段的要求，即DCS，PCS和UMTS band1,2,5,8频段，此处的UMTS(Universal Mobile Telecommunications System)，意思是通用移动通信系统。
进一步地，如图3所示，第一高频分支170和第二高频分支180分别位于接地脚140和馈入150的两侧；第一高频分支170和低频分支120均位于接地脚140和馈入150的同侧；第一高频分支170开路端的延伸方向与第二高频分支180开路的端延伸方向相互垂直设置。
优选地，如图2所示，第二槽孔130也可沿长方形的短边设置；第二槽孔130的开口端与第一槽孔160的开口端可位于长方形的同一长边上；第二槽孔130的长度小于第一槽孔160的长度设置。
由此可见，本发明的五频段内置天线可通过以下方式改善天线的带宽：一方面通过增加第一槽孔160以修改印刷电路板110的谐振模式，进而增大天线的低频带宽，另一方面通过激励第二槽孔130自身的谐振模式，以改善天线的高频带宽。
而且，天线低频的带宽性能基本由印刷电路板110的尺寸决定，特别是长度。内置天线由于尺寸较小，其自身谐振所覆盖的带宽远不能满足通信制式对信道的需求，然而，印刷电路板110其谐振模式所在的频率更接近天线低频的中间频率，所产生的带宽大于内置天线自身谐振的带宽。
因此，有效激励起印刷电路板110的谐振模式是增加天线低频带宽的有效途径。在垂直于印刷电路板110电流方向上开设第一槽孔160，延长电流路径，可以降低印刷电路板110的谐振频率，使之更加接近低频的中心频率，从而改善了内置天线的低频带宽范围。
此外，印刷电路板110上的第二槽孔130，在高频段可等效成一个四分之一波长的缝隙天线。缝隙天线作为内置天线的寄生单元，产生的谐振可以改善天线的高频带宽。
总之，所述通信终端装置的天线在有限的空间下，通过在印刷电路板110上加载的第一槽孔160，第二槽孔130，利用天线辐射单元的第二高频分支180以及天线辐射单元的低频分支120有效激励起印刷电路板110的谐振，并实现第一槽孔160和第二槽孔130的高频寄生单元作用，改进了天线的高低频带宽。利用印刷电路板110上的槽孔，改善了内置天线的低频和高频带宽，使得所述天线的带宽可以覆盖到GSM850、EGSM900、DCS、PCS和UMTS band 1,2,5,8频段，拓展后的带宽补偿了由手持状态带来的频率偏移，从而优化了手持状态下的性能，实现了便携无线通讯装置的小型化和宽带化。
试验测试的结果也表明，如图4所示，从其回波损耗的测试曲线上看，本发明五频段的内置天线确实具有足够的带宽以满足GSM850、EGSM900、DCS、PCS和UMTS band 1,2,5,8频段的需求。
应当理解的是，以上所述仅为本发明的较佳实施例而已，并不足以限制本发明的技术方案，对本领域普通技术人员来说，在本发明的精神和原则之内，可以根据上述说明加以增减、替换、变换或改进，例如，天线辐射单元包括单不限于平面倒F型天线，而所有这些增减、替换、变换或改进后的技术方案，都应属于本发明所附权利要求的保护范围。

Claims (10)

  1. 一种五频段的内置天线，其特征在于，包括：天线辐射单元的第一高频分支、第二高频分支和低频分支，以及设置在印刷电路板上的第一槽孔和第二槽孔；第一槽孔沿与印刷电路板电流相垂直的方向设置；低频分支的开路端适配在第一槽孔中；第二高频分支的开路端适配在第二槽孔中。
  2. 根据权利要求1所述的五频段的内置天线，其特征在于：印刷电路板的形状呈长方形；天线辐射单元的接地脚与馈入脚的连线沿长方形的长边设置；第一槽孔沿长方形的短边设置。
  3. 根据权利要求2所述的五频段的内置天线，其特征在于：第二槽孔沿长方形的短边设置。
  4. 根据权利要求2所述的五频段的内置天线，其特征在于：第一槽孔的开口端设置在远离天线辐射单元的接地脚与馈入脚一侧的长方形的长边上。
  5. 根据权利要求4所述的五频段的内置天线，其特征在于：第二槽孔的开口端与第一槽孔的开口端位于长方形的同一长边上。
  6. 根据权利要求1所述的五频段的内置天线，其特征在于：第一槽孔的长度小于长方形的短边长度。
  7. 根据权利要求1所述的五频段的内置天线，其特征在于：第二槽孔的长度小于第一槽孔的长度。
  8. 根据权利要求1所述的五频段的内置天线，其特征在于：第一高频分支和第二高频分支分别位于接地脚和馈入脚的两侧；第一高频分支和低频分支均位于接地脚和馈入脚的同侧。
  9. 根据权利要求1所述的五频段的内置天线，其特征在于：第一高频分支开路端的延伸方向与第二高频分支开路的端延伸方向相互垂直设置。
  10. 一种移动通信终端，包括外壳以及设置在外壳内的印刷电路板和内置天线；其特征在于，内置天线包括：天线辐射单元的第一高频分支、第二高频分支和低频分支，以及设置在印刷电路板上的第一槽孔和第二槽孔；第一槽孔沿与印刷电路板电流相垂直的方向设置；低频分支的开路端适配在第一槽孔中；第二高频分支的开路端适配在第二槽孔中。
PCT/CN2011/081835 2010-12-01 2011-11-05 一种五频段的内置天线及其移动通信终端 WO2012071967A1 (zh)

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