WO2012071968A1 - 一种五频段和蓝牙的内置天线及其移动通信终端 - Google Patents

一种五频段和蓝牙的内置天线及其移动通信终端 Download PDF

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Publication number
WO2012071968A1
WO2012071968A1 PCT/CN2011/081836 CN2011081836W WO2012071968A1 WO 2012071968 A1 WO2012071968 A1 WO 2012071968A1 CN 2011081836 W CN2011081836 W CN 2011081836W WO 2012071968 A1 WO2012071968 A1 WO 2012071968A1
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WIPO (PCT)
Prior art keywords
slot
antenna
circuit board
printed circuit
frequency
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PCT/CN2011/081836
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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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Publication date
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 ES11845333T priority Critical patent/ES2745496T3/es
Priority to EP11845333.1A priority patent/EP2648277B1/en
Priority to US13/810,801 priority patent/US9035833B2/en
Publication of WO2012071968A1 publication Critical patent/WO2012071968A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot 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
    • H01Q1/243—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
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • 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
    • 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
    • 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
    • H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field

Definitions

  • the present invention relates to the field of wideband antennas for wireless communication devices, and more particularly to improvements in a five-band and Bluetooth built-in antenna and mobile communication terminal therefor.
  • 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 824 MHz to 2170 MHz; this is particularly a problem with handheld mobile communication terminals, that is, during the call, the antenna may generate resonance intensities of different intensities due to hand-held
  • the position of the mobile communication terminal is different in the user's hand; and the 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 offset due to the resonance frequency.
  • Loss In the prior art, 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 and Bluetooth built-in antenna comprising: an antenna radiating unit and a first slot, a second slot and a third slot distributed on the printed circuit board; the first slot And the third slot is disposed in a direction perpendicular to the current of the printed circuit board; the second slot is disposed between the grounding leg of the antenna radiating unit and the feeding leg; the first slot, the second slot and the third slot
  • the holes are all open slots.
  • the five-band and Bluetooth 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; the first slot and the third slot They are all set along the short side of the rectangle.
  • the five-band and Bluetooth built-in antenna wherein: the second slot is disposed along a short side of the rectangle.
  • the five-band and Bluetooth built-in antenna wherein: the open end of the first slot is disposed on a long side of the rectangle of the grounding leg of the antenna radiating unit and the side of the feeding leg; the open end of the third slot is disposed at The grounding leg of the antenna radiating element is on the short side of the rectangle on the side of the feeding leg.
  • the five-band and Bluetooth built-in antenna wherein: the open end of the second slot and the open end of the first slot are located on the same long side of the rectangle.
  • the five-band and Bluetooth internal antenna wherein: the length of the first slot is smaller than the length of the short side of the rectangle; and the length of the third slot is smaller than the length of the first slot.
  • the five-band and Bluetooth built-in antenna wherein: the length of the second slot is smaller than the length of the first slot.
  • the five-band and Bluetooth built-in antenna wherein: the antenna radiating unit includes a low frequency branching portion; and the first slot partially overlaps the low frequency branching portion on a projection area on the printed circuit board.
  • the five-band and Bluetooth internal antenna wherein: the antenna radiating unit comprises a high frequency branching portion; the second slot partially overlaps the high frequency branching portion on a projection area on the printed circuit board; the third slot and the high frequency branch Part of the open end partially overlaps the projected area on the printed circuit board.
  • a mobile communication terminal includes a housing and a printed circuit board and an internal antenna disposed in the housing; wherein the built-in antenna includes an antenna radiating unit and first slot, second slot and third slot distributed on the printed circuit board a hole; the first slot and the third slot are both disposed in a direction perpendicular to the current of the printed circuit board; the second slot is disposed between the grounding leg of the antenna radiating unit and the feed leg; the first slot, the second slot Both the slot and the third slot are open slots.
  • the utility model provides a five-band and Bluetooth internal antenna and a mobile communication terminal thereof, which adopts a slot (including a first slot, a second slot and a third slot) on the printed circuit board, so as to Adjusting its low-frequency resonance mode to be close to the center frequency of the low-frequency branch of the antenna, exciting the printed circuit board by the antenna to generate resonance, thereby increasing the low-frequency bandwidth of the antenna; meanwhile, the high-frequency branch of the antenna is excited by the capacitive coupling
  • the slot resonates, and the high-frequency resonance of the antenna itself and the high-frequency parasitic resonance of the first slot form a new high-frequency operating bandwidth, thereby expanding the high-frequency bandwidth; in addition, the grounding pin of the antenna
  • the second slot between the feed pins also plays a role of matching fine adjustment to the input impedance of the high and low frequencies, further expanding the high frequency bandwidth to compensate for the frequency offset caused by the user's hand, and optimizing the mobile communication terminal.
  • the characteristics in the handheld mode thus achieving relatively large bandwidth
  • FIG. 1 is a schematic perspective view of a five-band and Bluetooth built-in antenna of the present invention.
  • FIG. 2 is a schematic plan view showing the planar structure of the five-band and Bluetooth built-in antenna of the present invention in a PCB board portion.
  • FIG. 3 is a top plan view of the five-band and Bluetooth built-in antenna of the present invention.
  • a five-band and Bluetooth internal antenna of the present invention includes an antenna radiating unit 120 and a first slot 160 and a second slot distributed on the printed circuit board 110. 130 and the third slot 170; the first slot 160 and the third slot 170 are both disposed in a direction perpendicular to the current of the printed circuit board 110; the second slot 130 is disposed at the grounding pin 140 of the antenna radiating unit 120 and the feed The first slot 160, the second slot 130, and the third slot 170 are both open slots.
  • 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 built-in antenna includes an antenna radiating unit 120 and is disposed in printing a first slot 160, a second slot 130, and a third slot 170 on the circuit board 110; the first slot 160 and the third slot 170 are disposed in a direction perpendicular to the current of the printed circuit board 110;
  • the hole 130 is disposed between the grounding leg 140 of the antenna radiating unit 120 and the feeding leg 150; the first slot 160, the second slot 130, and the third slot 170 are all open slots.
  • the five-band and Bluetooth built-in antenna provided by the present invention and the mobile communication terminal thereof have adopted slots on the printed circuit board 110 (including the first a slot 160, a second slot 130 and a third slot 170) to adjust its low frequency resonance mode to be close to the center frequency of the low frequency branch portion of the antenna, and the antenna is excited by the antenna to generate resonance, thereby increasing The low frequency bandwidth of the antenna; at the same time, the high frequency branching portion of the antenna excites the third slot 170 to generate resonance by capacitive coupling, which together with the high frequency resonance of the antenna itself and the high frequency parasitic resonance of the first slot 160 constitute a new high Frequency operating bandwidth, thereby expanding the high frequency bandwidth; in addition, the second slot 130 between the grounding pin 140 of the antenna and the feeding leg 150 also plays a role of matching fine adjustment to the input impedance of the high and low frequencies. Further expanding the high-frequency bandwidth to compensate for the frequency offset caused by the user's hand-held,
  • the antenna radiating unit 120 has two terminals.
  • the branching part of the open circuit works on a quarter-wavelength resonance; the shorter outer side is a high-frequency branching portion, and the inner narrower length is a low-frequency branching part.
  • the antenna radiating unit 120 is limited in size, its own resonant bandwidth cannot normally meet the requirements of multiple communication systems for wireless channels, especially in the low frequency band; therefore, in this case, the antenna radiating unit 120 can be regarded as An excitation unit that excites the printed circuit board 110 and utilizes the advantage of the larger size of the printed circuit board 110, making it a resonant mode of the low frequency band.
  • the printed circuit board 110 may have a rectangular shape in a longitudinal direction; a connecting line of the grounding leg 140 of the antenna radiating unit 120 and the feeding leg 150 is disposed along a long side of the rectangle; the first slot 160 Set 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 disposed in parallel with the width direction of the printed circuit board 110, but the printed circuit board 110 is not completely cut off.
  • the first slot 160 is excited by the low-frequency branch portion of the antenna radiating unit 120, and the resonance of the antenna radiating unit 120 itself is equivalent to the parallel connection of the two resonant circuits on the circuit, and the bandwidth can cover the GSM850 and GSM900 bands.
  • GSM Global System for Mobile Communications
  • GSM Global System for Mobile Communications
  • the open end of the first slot 160 is disposed on the long side of the rectangle of the grounding leg 140 of the antenna radiating element 120 and the side of the feed leg 150.
  • the length of the first slot 160 does not exceed the length of the short side of the rectangle.
  • 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 the bandwidth of the high band so that its bandwidth can cover the 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 first slot 160 may coincide with the low frequency branch portion of the antenna radiating unit 120 in the height direction to achieve effective capacitive coupling with the antenna radiating unit 120; in other words, the first The position of the slot 160 on the printed circuit board 110 may partially overlap the projection area of the low frequency branch portion on the printed circuit board 110, or may be located in the projection area of the low frequency branch portion of the antenna radiating unit 120 on the printed circuit board 110.
  • the third slot 170 may be disposed along the short side of the rectangle, or the third slot 170 may be disposed parallel to the first slot 160; the open end of the third slot 170 is disposed at The grounding leg 140 of the antenna radiating unit 120 and the short side of the rectangular shape of the feeding leg 150; the length of the third slot 170 is smaller than the length of the first slot 160; the third slot 170 and the high frequency branch portion The projected ends of the open ends on the printed circuit board 110 partially overlap.
  • the open end of the third slot 170 is disposed at the top end of the printed circuit board 110, and partially overlaps the open end of the high frequency branch of the antenna radiating unit 2 in the height direction.
  • the third slot 170 resonates at UMTS Receive band for BAND1, 2, 5, 8, here UMTS (Universal Mobile Telecommunications System) means a universal mobile communication system.
  • the high frequency branching portion of the antenna radiating unit 120 can excite the resonant current of the third slot 170 by capacitive coupling, and the high frequency resonance of the antenna radiating unit 120 itself and the high frequency resonance of the first slot 160 constitute a new high. Frequency operating bandwidth, its high frequency bandwidth can cover 2.5GHz, to meet the needs of Bluetooth communication for wireless channels.
  • the second slot 130 may 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 may be located on the same long side of the rectangle.
  • the length of the second slot 130 is smaller than the length of the first slot 160.
  • the second slot 130 may coincide with the high frequency branch portion of the antenna radiating unit 120 in the height direction to achieve effective capacitive coupling with the antenna radiating unit 120; in other words, The position of the two slots 130 on the printed circuit board 110 may partially overlap the projection area of the high frequency branch portion on the printed circuit board 110, or may be located on the printed circuit board 110 at the high frequency branch portion of the antenna radiating unit 120. Within the projection area.
  • the second slot 130 is disposed between the grounding leg 1404 of the antenna radiating unit 120 and the feeding leg 150 of the antenna radiating unit 120, and functions to match the input impedance; appropriately adjust the length of the second slot 130, It can fine-tune the input impedance of high and low frequencies, especially the matching adjustment of the input impedance of the high frequency band, which can further expand the bandwidth of high frequency to compensate for the frequency offset caused by the user's hand-held, and optimize the mobile communication terminal.
  • the five-band and Bluetooth built-in antenna of the present invention can improve the bandwidth of the antenna by increasing the first slot 160 to adjust the resonant mode of the printed circuit board 110 to be closer to the center of the low frequency band.
  • Frequency which in turn increases the low frequency bandwidth of the antenna; on the other hand, by exciting the resonant mode of the third slot 170 and the quarter resonance mode of the first slot 160 itself to improve the high frequency bandwidth of the antenna;
  • the grounding 140 of the face-down F antenna and the second slot 130 introduced between the feed pins 150 can further adjust the high and low frequency input impedance matching.
  • the bandwidth performance of the antenna low frequency is basically determined by the size of the printed circuit board 110, especially the length; due to the small size of the built-in antenna, the bandwidth covered by its own resonance is far from meeting the communication channel requirements; however, the printed circuit board The frequency at which the resonant mode is located is closer to the center frequency of the antenna's low frequency, and the resulting bandwidth is often greater than the bandwidth of the built-in 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. Therefore, opening the first slot 160 in the 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 of the built-in antenna. Bandwidth range.
  • the first slot 160 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 mobile communication terminal device utilizes the slot on the printed circuit board 110 in a limited space to improve the low frequency and high frequency bandwidth of the built-in antenna, so that the bandwidth of the antenna can cover GSM850, EGSM900, DCS, PCS, UMTS Band 1, 2, 5, 8, and Bluetooth bands, the expanded bandwidth can compensate for the frequency offset caused by the handheld state, thus optimizing the performance of the mobile communication terminal in the handheld state.
  • test results show that, as shown in Figure 4, the five-band and Bluetooth built-in antennas of the present invention do have sufficient bandwidth to meet GSM850, EGSM900, DCS, PCS, UMTS, as seen from the test curve of their return loss. BAND1, 2, 5, 8 and Bluetooth 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和蓝牙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以及分布在印刷电路板上的第一槽孔、第二槽孔和第三槽孔；第一槽孔和第三槽孔均沿与印刷电路板电流相垂直的方向设置；第二槽孔设置在接地脚与馈入脚之间；第一槽孔、第二槽孔和第三槽孔均为开口槽孔。由于采用了在印刷电路板上增加槽孔，使之接近天线低频分支部分的中心频率，通过激励印刷电路板产生谐振增大天线低频带宽；天线高频分支部分通过容性耦合激励第三槽孔谐振，与天线自身的高频谐振以及第一槽孔的高频寄生谐振共同组成了新的高频工作带宽；第二槽孔对高低频的输入阻抗起到了匹配微调的作用，以弥补手持产生的频率偏移，优化了移动通信终端的特性。

Description

一种五频段和蓝牙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，更具体的地说，改进涉及的是一种五频段和蓝牙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；对此特别是手持移动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，这是由于手持移动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，提供一种五频段和蓝牙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，以满足移动通信终端小型化的发展需求。
本发明的技术方案如下：一种五频段和蓝牙的内置天线，其中，包括天线辐射单元以及分布在印刷电路板上的第一槽孔、第二槽孔和第三槽孔；第一槽孔和第三槽孔均沿与印刷电路板电流相垂直的方向设置；第二槽孔设置在天线辐射单元的接地脚与馈入脚之间；第一槽孔、第二槽孔和第三槽孔均为开口槽孔。
所述的五频段和蓝牙的内置天线，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；第一槽孔和第三槽孔均沿长方形的短边设置。
所述的五频段和蓝牙的内置天线，其中：第二槽孔沿长方形的短边设置。
所述的五频段和蓝牙的内置天线，其中：第一槽孔的开口端设置在天线辐射单元的接地脚与馈入脚一侧的长方形的长边上；第三槽孔的开口端设置在天线辐射单元的接地脚与馈入脚一侧的长方形的短边上。
所述的五频段和蓝牙的内置天线，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。
所述的五频段和蓝牙的内置天线，其中：第一槽孔的长度小于长方形的短边长度；第三槽孔的长度小于第一槽孔的长度。
所述的五频段和蓝牙的内置天线，其中：第二槽孔的长度小于第一槽孔的长度。
所述的五频段和蓝牙的内置天线，其中：天线辐射单元包括低频分支部分；第一槽孔与低频分支部分在印刷电路板上的投影区域部分重叠。
所述的五频段和蓝牙的内置天线，其中：天线辐射单元包括高频分支部分；第二槽孔与高频分支部分在印刷电路板上的投影区域部分重叠；第三槽孔与高频分支部分的开路端在印刷电路板上的投影区域部分重叠。
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以及分布在印刷电路板上的第一槽孔、第二槽孔和第三槽孔；第一槽孔和第三槽孔均沿与印刷电路板电流相垂直的方向设置；第二槽孔设置在天线辐射单元的接地脚与馈入脚之间；第一槽孔、第二槽孔和第三槽孔均为开口槽孔。
本发明所提供的一种五频段和蓝牙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、第二槽孔和第三槽孔)，以调整其低频谐振模式，使之接近天线低频分支部分的中心频率，通过天线激励印刷电路板产生谐振，由此增大了天线的低频带宽；同时，天线高频分支部分通过容性耦合激励第三槽孔产生谐振，与天线自身的高频谐振以及第一槽孔的高频寄生谐振共同组成了新的高频工作带宽，由此也拓展了高频带宽；此外，介于天线的接地脚与馈入脚之间的第二槽孔，对高低频的输入阻抗还起到了匹配微调的作用，进一步拓展了高频带宽，以弥补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是本发明五频段及蓝牙内置天线的立体结构示意图。
图2是本发明五频段及蓝牙内置天线在PCB板部分的平面结构示意图。
图3是本发明五频段及蓝牙内置天线的俯视示意图。
图4是本发明五频段及蓝牙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和蓝牙的内置天线，其具体实施方式之一，如图1所示，包括天线辐射单元120以及分布在印刷电路板110上的第一槽孔160、第二槽孔130和第三槽孔170；第一槽孔160和第三槽孔170均沿与印刷电路板110电流相垂直的方向设置；第二槽孔130设置在天线辐射单元120的接地脚140与馈入脚150之间；第一槽孔160、第二槽孔130和和第三槽孔170均为开口槽孔。
基于上述五频段和蓝牙的内置天线，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120以及设置在印刷电路板110上的第一槽孔160、第二槽孔130和第三槽孔170；第一槽孔160和第三槽孔170沿与印刷电路板110电流相垂直的方向设置；第二槽孔130设置在天线辐射单元120的接地脚140与馈入脚150之间；第一槽孔160、第二槽孔130和第三槽孔170均为开口槽孔。
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和蓝牙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、第二槽孔130和第三槽孔170)，以调整其低频谐振模式，使之接近天线低频分支部分的中心频率，通过天线激励印刷电路板110产生谐振，由此增大了天线的低频带宽；同时，天线高频分支部分通过容性耦合激励第三槽孔170产生谐振，与天线自身的高频谐振以及第一槽孔160的高频寄生谐振共同组成了新的高频工作带宽，由此也拓展了高频带宽；此外，介于天线的接地脚140与馈入脚150之间的第二槽孔130，对高低频的输入阻抗还起到了匹配微调的作用，进一步拓展了高频带宽，以弥补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120为例，在本发明五频段和蓝牙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，天线辐射单元120上有两个终端开路的分支部分，其工作原理是四分之一波长谐振；外侧较宽长度较短的是高频分支部分，内侧较窄长度较长的是低频分支部分。因天线辐射单元120受到尺寸的限制，其本身谐振的带宽通常情况下无法满足多种通信制式对无线信道的需求，尤其在低频段；故在此情况下，可将天线辐射单元120可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的形状可呈纵向的长方形；天线辐射单元120的接地脚140与馈入脚150的连线沿该长方形的长边设置；第一槽孔160沿该长方形的短边设置。
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，第一槽孔160在天线辐射单元120的低频分支部分激励下，与天线辐射单元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，此处的GSM(Global System for Mobile Communications)意思是全球移动通讯系统。
进一步地，如图2所示，第一槽孔160的开口端设置在天线辐射单元120的接地脚140与馈入脚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，由其产生的谐振可帮助增加高频段的带宽，以使其带宽可以覆盖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。
进一步地，如图3所示，第一槽孔160在高度方向上可与天线辐射单元120的低频分支部分重合，以达到与天线辐射单元120进行有效电容耦合之目的；换句话说，第一槽孔160在印刷电路板110上的位置，可与低频分支部分在印刷电路板110上的投影区域部分重叠，也可位于天线辐射单元120的低频分支部分在印刷电路板110上的投影区域内。
进一步地，如图3所示，第三槽孔170可沿该长方形的短边设置，或者，第三槽孔170也可平行第一槽孔160设置；第三槽孔170的开口端设置在天线辐射单元120的接地脚140与馈入脚150一侧的长方形的短边上；第三槽孔170的长度小于第一槽孔160的长度设置；第三槽孔170与高频分支部分的开路端在印刷电路板110上的投影区域部分重叠。
具体的，第三槽孔170的开口端设置在印刷电路板110的顶端，在高度方向与天线辐射单元2的高频分支的开路端部分重叠。由此，第三槽孔170谐振在UMTS BAND1,2,5,8的接收频段，此处的UMTS(Universal Mobile Telecommunications System)，意思是通用移动通信系统。天线辐射单元120的高频分支部分通过容性耦合可激励起第三槽孔170的谐振电流，与天线辐射单元120自身的高频谐振以及第一槽孔160的高频谐振共同组成新的高频工作带宽，其高频带宽可以覆盖到2.5GHz，可满足蓝牙通信对无线信道的需求。
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。
进一步地，如图3所示，第二槽孔130在高度方向上可与天线辐射单元120的高频分支部分重合，以达到与天线辐射单元120进行有效电容耦合之目的；换句话说，第二槽孔130在印刷电路板110上的位置，可与高频分支部分在印刷电路板110上的投影区域部分重叠，也可位于天线辐射单元120的高频分支部分在印刷电路板110上的投影区域内。
之所以将第二槽孔130设置在天线辐射单元120的接地脚1404与天线辐射单元120的馈入脚150之间，其作用在于进行输入阻抗的匹配；适当调整第二槽孔130的长度，可以对高低频的输入阻抗起到微调的作用，尤其是高频段的输入阻抗的匹配调节作用，可以进一步拓展高频的带宽，以弥补由于用户手持时造成的频率偏移，优化移动通信终端在手持模式下的特性。
由此可见，本发明的五频段和蓝牙的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以调整印刷电路板110的谐振模式，使之更加接近低频段的中心频率，进而增大天线的低频带宽；另一方面通过激励第三槽孔170的谐振模式和第一槽孔160自身的四分之一谐振模式，以改善天线的高频带宽；另外通过在平面倒F天线的接地140和馈入引脚150间引入的第二槽孔130，可进一步进行高低频输入阻抗匹配的调整。
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心频率，所产生的带宽往往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。由此，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，这个位于印刷电路板110上的第一槽孔160，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，所述移动通信终端装置的天线在有限的空间下，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、UMTS band 1,2,5,8，以及蓝牙频段，拓展后的带宽可以补偿由手持状态造成的频率偏移，从而优化了移动通信终端在手持状态下的性能。
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，本发明五频段和蓝牙的内置天线确实具有足够的带宽以满足GSM850、EGSM900、DCS、PCS、UMTS BAND1,2,5,8以及蓝牙频段的需求。
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. 一种五频段和蓝牙的内置天线，其特征在于，包括天线辐射单元以及分布在印刷电路板上的第一槽孔、第二槽孔和第三槽孔；第一槽孔和第三槽孔均沿与印刷电路板电流相垂直的方向设置；第二槽孔设置在天线辐射单元的接地脚与馈入脚之间；第一槽孔、第二槽孔和第三槽孔均为开口槽孔。
  2. 根据权利要求1所述的五频段和蓝牙的内置天线，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；第一槽孔和第三槽孔均沿长方形的短边设置。
  3. 根据权利要求2所述的五频段和蓝牙的内置天线，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所述的五频段和蓝牙的内置天线，其特征在于：第一槽孔的开口端设置在天线辐射单元的接地脚与馈入脚一侧的长方形的长边上；第三槽孔的开口端设置在天线辐射单元的接地脚与馈入脚一侧的长方形的短边上。
  5. 根据权利要求2所述的五频段和蓝牙的内置天线，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2所述的五频段和蓝牙的内置天线，其特征在于：第一槽孔的长度小于长方形的短边长度；第三槽孔的长度小于第一槽孔的长度。
  7. 根据权利要求1所述的五频段和蓝牙的内置天线，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所述的五频段和蓝牙的内置天线，其特征在于：天线辐射单元包括低频分支部分；第一槽孔与低频分支部分在印刷电路板上的投影区域部分重叠。
  9. 根据权利要求1所述的五频段和蓝牙的内置天线，其特征在于：天线辐射单元包括高频分支部分；第二槽孔与高频分支部分在印刷电路板上的投影区域部分重叠；第三槽孔与高频分支部分的开路端在印刷电路板上的投影区域部分重叠。
  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以及分布在印刷电路板上的第一槽孔、第二槽孔和第三槽孔；第一槽孔和第三槽孔均沿与印刷电路板电流相垂直的方向设置；第二槽孔设置在天线辐射单元的接地脚与馈入脚之间；第一槽孔、第二槽孔和第三槽孔均为开口槽孔。
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