CN109904606A - A three-band four-unit MIMO antenna with high isolation - Google Patents
A three-band four-unit MIMO antenna with high isolation Download PDFInfo
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Abstract
本发明公开了一种高隔离度三频四单元MIMO天线，它包括：介质基板、四个天线辐射单元、四个同轴馈电头、接地板、两个中间开缝Y型枝节、四个矩形地板缝隙；其天线辐射单元采用了两个天线辐射段结构设计，包括：呈倒“乙”形弯折线条状为第一天线辐射段、呈“L”形弯折线条状为第二天线辐射段；四个天线单元分别放置在介质基板的四角，背对背放置。本发明MIMO天线工作频率为2.5GHz、3.5GHz、5.8GHz，可应用于WLAN(2.4GHz和5.8GHz)、5G(3.5GHz)通信，且该天线具有高隔离度，在高于2.4GHz频段内，天线单元间获得了超过15dB的隔离度。该MIMO天线整体尺寸较小、设计简单、带宽带、易于批量加工生产、制造成本低。
The invention discloses a high isolation three-frequency four-unit MIMO antenna, which comprises: a dielectric substrate, four antenna radiation units, four coaxial feed heads, a ground plate, two middle-slotted Y-shaped branches, four Rectangular floor slot; its antenna radiation unit adopts two antenna radiation segment structure design, including: the first antenna radiation segment in the shape of an inverted "B"-shaped curved line, and the second antenna in the shape of an "L"-shaped curved line Radiating segment; four antenna units are placed at the four corners of the dielectric substrate, back-to-back. The working frequency of the MIMO antenna of the present invention is 2.5GHz, 3.5GHz and 5.8GHz, which can be applied to WLAN (2.4GHz and 5.8GHz), 5G (3.5GHz) communication, and the antenna has high isolation, and the frequency is higher than 2.4GHz. , an isolation of more than 15dB is obtained between the antenna units. The overall size of the MIMO antenna is small, the design is simple, the bandwidth is wide, the mass production is easy, and the manufacturing cost is low.
Description
Technical field
The present invention relates to antenna technical fields, and in particular to a kind of three four unit mimo antennas of frequency of high-isolation.
Background technique
The sharp increase of mobile subscriber's quantity, consumer are growing for high-speed, the signal transmission demand of high quality.
New technology, new equipment, NPD projects update iteration need a large amount of frequency spectrum resource, however frequency spectrum resource is non-renewable, leads
It causes excessively use it.How limited frequency spectrum resource is maximally utilized, and sufficiently excavating space resources becomes both at home and abroad
The hot spot of scholar's research.The it is proposed of multiple-input and multiple-output (Multiple-Input Multiple-Output, MIMO) technology makes
Must solve rare frequency spectrum resource and growing consumption demand becomes possibility.MIMO technology is in transmitting terminal and receiving end
More transmitting antennas and receiving antenna are placed respectively, make signal by the transmission of the mutiple antennas of transmitting terminal and receiving end and are received,
And then improve communication quality.MIMO technology can be such that system believes under the premise of not increasing frequency spectrum resource and antenna transmission power
Road capacity increases more times, shows apparent advantage.
WLAN has been widely used in factory, quotient because its mobility is high, be easy arrangement, is easy to the advantages that extending
Field, colleges and universities and family etc..By development in more than 30 years, WLAN was extended to 802.11ac by 802.11 initial standards,
Transmission rate reaches as high as 1Gbps by supporting 2Mbps to develop to.Nowadays 802.11ac gradually makes good, double frequency WLAN (2.4GHz and
5.8GHz) mobile phone, routing are more and more, and double-frequency wireless AP gradually carries out.On November 15th, 2017, Ministry of Industry and Information, which determines, uses 3300
~3600MHz is 5G system intermediate-frequency band；December 10, Ministry of Industry and Information have formally issued three big operators, the country low in 5G system
Frequency range test frequency uses license.Important technology one of of the MIMO as 5G and 802.11ac,
Currently, MIMO multi-antenna technology is mainly used in WLAN, LTE and 5G, and the miniaturization of terminal, multifunction
So that antenna can be smaller and smaller using space, this proposes high requirement to antenna cell design.Mimo antenna satisfaction also in need
The requirement of wide bandwidth and high-isolation.The four unit mimo antenna sizes studied at present are larger, and narrower bandwidth, can not cover more
More frequency ranges, isolation are lower, it is difficult to meet the requirement of miniaturization terminal.
Summary of the invention
The purpose of the present invention is designing a kind of small in size, wide bandwidth, four unit mimo antennas of high-isolation, which can
It is communicated for WLAN (2.4GHz and 5.8GHz) and 5G.
Present invention employs following technical solutions:
A kind of three four unit mimo antennas of frequency of high-isolation, which is characterized in that it includes: medium substrate, four antenna spokes
Penetrate unit, four coaxial feed datelines, earth plate, two slotting in middle Y type minor matters, four rectangle floor joints；It is characterized in that,
The antenna radiation unit includes: in " second " shape bending linear is first antenna radiant section, L-shaped bending linear is
Second aerial radiation section.
Three four unit mimo antennas of frequency of above-mentioned high-isolation, preferably, entire antenna about laterally, it is vertical in
Axis mirror symmetry.
Above-mentioned three four unit mimo antennas of frequency of high-isolation, preferably, the material therefor of the dielectric-slab is
FR4, relative dielectric constant 4.4, and the transverse width of dielectric-slab, vertical height and sheet thickness dimension be respectively 80mm, 60mm,
1.6mm。
Above-mentioned three four unit mimo antennas of frequency of high-isolation, preferably, the microstrip feed line top and radiation
Unit is connected, and bottom end is fed using coaxial feed dateline.
Above-mentioned three four unit mimo antennas of frequency of high-isolation, preferably, four rectangle floor joints position
In vertical axis line position, gap horizontal spacing is 1mm, and vertical spacing is 4mm.
Above-mentioned three four unit mimo antennas of frequency of high-isolation, preferably, the slotting in middle Y type minor matters are located at
Medium back transverse direction axis line position, and extend vertically upward from the top of earth plate；It is described to crack for rectangle fine crack, from Y
Extend vertically downwards at shape node, development length 20mm, fine crack width is 0.3mm.
Above-mentioned three four unit mimo antennas of frequency of high-isolation, preferably, the first antenna radiant section generates
Two resonance frequencies: 2.5GHz, 5.8GHz；Second aerial radiation section generates 3.5GHz resonance frequency.
Compared with the prior art, the present invention has following beneficial outcomes:
Three four unit mimo antennas of frequency of high-isolation of the present invention include: medium substrate, four antenna radiation units, four it is micro-
Ribbon feeder, earth plate, four rectangle floor joints, two slotting in middle Y type minor matters；The aerial radiation patch is using special
Two aerial radiation segment structures design, including in fall " second " type bending linear first antenna radiant section, be C-shaped bending
Second aerial radiation section of strip, so that antenna has tri- resonant frequency points of 2.5GHz, 3.5GHz, 5.8GHz；Described four
A rectangle floor joint is located at vertical axis line position, the current coupling for inhibiting earth plate vertical；Two centres
Y type minor matters of cracking are located at medium back transverse direction axis line position, for inhibiting the current coupling and space wave of earth plate transverse direction.
Entire antenna about laterally, vertical central axes mirror symmetry so that antenna is under the conditions of meeting reflection coefficient less than -10dB,
Working frequency range is 2.22~2.55GHz, 3.36~3.80GHz and 5.47~5.95GHz, and each antenna in working frequency range
Between isolation be all larger than 15dB；And four unit mimo antenna overall dimensions are small frequently, covering frequency range is wide, structure for the high-isolation three
It is simple and compact, to be easy to batch machining production, manufacturing cost low, therefore can perform well in minimizing mobile communication system or intelligence
WLAN (2.4GHz and 5.8GHz) and 5G communication can be provided on mobile terminal device.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of embodiment of the present invention
Fig. 2 is the positive structure schematic of embodiment of the present invention
Fig. 3 is the structure schematic diagram of embodiment of the present invention
Fig. 4 is the S parameter simulation curve figure of embodiment of the present invention
Fig. 5 is the gain simulation curve figure of embodiment of the present invention
Fig. 6 is the envelope correlation coefficient simulation curve figure of embodiment of the present invention
Specific implementation
In order to which the purpose of the present invention, technical solution and its advantage is more clearly understood, below in conjunction with attached drawing to the present invention
It is further elaborated.
As shown in Figure 1, a kind of small in size, wide bandwidth is present embodiments provided, four unit mimo antennas of high-isolation,
Basic structure include: medium substrate, four antenna radiation units, four microstrip feed lines, earth plate, four rectangle floor joints,
Two slotting in middle Y type minor matters.Wherein, earth plate is printed on medium back, earth plate in the form of patch with dielectric-slab phase
Even；Four antenna elements are individually positioned in the positive quadrangle of medium substrate, are placed back to back.
One embodiment of the present of invention as shown in Figure 1, preferably, dielectric-slab using in the market it is more common,
Cheap FR-4, the size of transverse width L, vertical height W and plate thickness are respectively 60mm, 80mm, 1.6mm, with
Meet Miniaturization Design requirement.Correspondingly, when aerial radiation patch and metal ground plate implement, it can be used and be printed on
Certain thickness metal coating on dielectric-slab, such as the copper coat of 35 μ m thicks can be used, it in this way can be convenient for using printing
Circuit fabrication technique produces and processes four unit mimo antennas of high-isolation of the present invention, convenient for batch production and reduce at
This.
As shown in Fig. 2, the antenna radiation unit of four mirror symmetries, wherein bending broken line strip in " second " type of falling
First antenna radiant section include the first lateral radiation section L1, upwardly extend from 1 left end of the first lateral radiation section first
Vertical radiant section L2, the second lateral radiation section L for extending to the left from the described first vertical radiant section top3, from it is described second laterally
The second vertical radiant section L that radiant section left end extends downwardly4；First lateral radiation section L1Length be 4.8mm, width 2mm,
And the first lateral radiation section L1Right end and microstrip feed line FlThe left side position of upper end is connected；First vertical radiant section L2
Length be 11.6mm, width 1mm；Second lateral radiation section L3Length be 5mm, width 1.5mm；Second vertical radiation
Section L4Length be 6.3mm, width 2mm.
As shown in Fig. 2, the second aerial radiation section for being C-shaped bending linear includes that vertically arranged third vertically radiates
Section C2, the third lateral radiation section C that extends to the left from the vertical radiant section bottom end of the third1, from the vertical radiant section top of the third
Hold the 4th lateral radiation section C extended to the left3；The vertical radiant section C of third2A length of 2.93mm, width 1mm；Third lateral radiation
Section C1A length of 4.46mm, width 1mm；4th lateral radiation section C3A length of 6.24mm, width 2mm.
As shown in figure 3, four rectangle floor joints are located at the vertical axis line position of earth plate, the rectangular aperture is by being grounded
The edge of plate laterally inwardly extends, lateral length Sl2For 29.5mm, vertical width SwFor 4mm；Horizontal spacing between adjacent slits
It is 4mm for 1mm, vertical spacing t.
As shown in figure 3, slotting in middle Y type minor matters are located at earth plate transverse direction axis line position, and perpendicular from the top of earth plate
To upwardly extending；It is described to crack for rectangle fine crack, extend vertically downwards from Y-junction point, development length Sl1For 20mm, fine crack is wide
Degree is 0.3mm.
Three four unit mimo antennas of frequency of high-isolation designed by the invention are directed to, business software ANSYS is utilized
Electronics Desktop carries out simulation calculation.
Fig. 4 is the S parameter figure of three four unit mimo antennas of frequency of high-isolation of the present invention, as shown in figure 3, antenna is in reflection
Under conditions of number S11 < -10dB, working frequency range is 2.22~2.55GHz, 3.36~3.80GHz and 5.47~5.95GHz.It
Transmission coefficient S21 between line unit 1 and antenna element 2 is less than -15dB in the frequency range greater than 2.4GHz；Antenna element 1 with
Transmission coefficient S31 between antenna element 3 is less than -15dB in full frequency band；Transmission system between antenna element 1 and antenna element 4
Number S41 is less than -20dB, isolation with higher in full frequency band.So two kinds of decoupling arrangements that the present invention uses obtain it is good
Good decoupling effect.
Fig. 5 is gain diagram of the three four unit mimo antennas of frequency of high-isolation of the present invention in three working frequency range.From figure
As can be seen that obtaining the gain for being higher than 4dB in 2.4GHz and 3.5GHz bandwidth of operation, obtained in 5.8GHz bandwidth of operation high
In the gain of 5.7dB, 7.5dB is reached as high as, antenna has stronger receiving and transmitting signal ability.
Fig. 6 is the envelope correlation coefficient of three four unit mimo antennas of frequency of high-isolation of the present invention.It can be seen from the figure that day
Line is in the frequency band greater than 2.2GHz, and envelope correlation coefficient is respectively less than 0.4, substantially near 0 in 3~4.5GHz.Antenna exists
Entire working band correlation is smaller, meets the design standard that envelope correlation coefficient is lower than 0.5, obtains good diversity gain.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention rather than limits, it is clear that for this
For the professional in field, after having understood the content of present invention and principle, it can modify to technical solution of the present invention
Or equivalent replacement, but these modifications and equivalent replacement based on inventive concept are still in claim and protection of the invention
Within the scope of.
Claims (7)
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910191278.4A CN109904606A (en) | 2019-03-13 | 2019-03-13 | A three-band four-unit MIMO antenna with high isolation |
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| CN201910191278.4A CN109904606A (en) | 2019-03-13 | 2019-03-13 | A three-band four-unit MIMO antenna with high isolation |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350312A (en) * | 2019-07-04 | 2019-10-18 | 北京理工大学 | A 5G mobile terminal MIMO antenna based on circuit decoupling |
| CN110492232A (en) * | 2019-07-16 | 2019-11-22 | 清华大学 | A kind of four-antenna system that the multiband applied to 5G mobile terminal covers |
| CN111293434A (en) * | 2020-03-27 | 2020-06-16 | 上海电力大学 | 5G dual-frequency binary MIMO antenna |
| CN111293432A (en) * | 2020-03-19 | 2020-06-16 | 上海电力大学 | Tri-frequency binary MIMO antenna capable of being used for WLAN/WiMAX/5G |
| CN111755808A (en) * | 2020-07-02 | 2020-10-09 | 重庆邮电大学 | A broadband millimeter-wave MIMO antenna loaded with horizontal radiating branches and butterfly parasitic elements |
| CN111834748A (en) * | 2020-08-17 | 2020-10-27 | 阳光学院 | Structure and method for improving antenna isolation of MIMO system |
| CN111883924A (en) * | 2020-08-10 | 2020-11-03 | 珠海格力电器股份有限公司 | Internet of things equipment, dual-frequency antenna and design method thereof |
| CN112952377A (en) * | 2019-12-10 | 2021-06-11 | 深圳市万普拉斯科技有限公司 | Antenna group and communication device |
| CN113224528A (en) * | 2021-04-30 | 2021-08-06 | 黄山学院 | CPW fed 5G communication broadband MIMO terminal antenna |
| CN112563730B (en) * | 2020-11-27 | 2021-10-26 | 南京航空航天大学 | High-isolation ultra-wideband MIMO antenna suitable for 5G full-band communication |
| CN114243293A (en) * | 2021-12-16 | 2022-03-25 | 杭州电子科技大学 | A multi-element self-decoupling high isolation miniaturized MIMO antenna array |
| WO2024067496A1 (en) * | 2022-09-27 | 2024-04-04 | 华为技术有限公司 | Antenna assembly and communication device |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350312A (en) * | 2019-07-04 | 2019-10-18 | 北京理工大学 | A 5G mobile terminal MIMO antenna based on circuit decoupling |
| CN110492232A (en) * | 2019-07-16 | 2019-11-22 | 清华大学 | A kind of four-antenna system that the multiband applied to 5G mobile terminal covers |
| CN112952377A (en) * | 2019-12-10 | 2021-06-11 | 深圳市万普拉斯科技有限公司 | Antenna group and communication device |
| CN111293432A (en) * | 2020-03-19 | 2020-06-16 | 上海电力大学 | Tri-frequency binary MIMO antenna capable of being used for WLAN/WiMAX/5G |
| CN111293434A (en) * | 2020-03-27 | 2020-06-16 | 上海电力大学 | 5G dual-frequency binary MIMO antenna |
| CN111755808A (en) * | 2020-07-02 | 2020-10-09 | 重庆邮电大学 | A broadband millimeter-wave MIMO antenna loaded with horizontal radiating branches and butterfly parasitic elements |
| CN111755808B (en) * | 2020-07-02 | 2022-07-19 | 重庆邮电大学 | Broadband millimeter wave MIMO antenna loaded with horizontal radiation branches and butterfly parasitic units |
| CN111883924A (en) * | 2020-08-10 | 2020-11-03 | 珠海格力电器股份有限公司 | Internet of things equipment, dual-frequency antenna and design method thereof |
| CN111883924B (en) * | 2020-08-10 | 2021-07-16 | 珠海格力电器股份有限公司 | Internet of things equipment, dual-frequency antenna and design method thereof |
| CN111834748A (en) * | 2020-08-17 | 2020-10-27 | 阳光学院 | Structure and method for improving antenna isolation of MIMO system |
| CN112563730B (en) * | 2020-11-27 | 2021-10-26 | 南京航空航天大学 | High-isolation ultra-wideband MIMO antenna suitable for 5G full-band communication |
| CN113224528A (en) * | 2021-04-30 | 2021-08-06 | 黄山学院 | CPW fed 5G communication broadband MIMO terminal antenna |
| CN113224528B (en) * | 2021-04-30 | 2024-05-24 | 黄山学院 | CPW (compact phase-locked loop) feed 5G (5G) communication broadband MIMO (multiple input multiple output) terminal antenna |
| CN114243293A (en) * | 2021-12-16 | 2022-03-25 | 杭州电子科技大学 | A multi-element self-decoupling high isolation miniaturized MIMO antenna array |
| WO2024067496A1 (en) * | 2022-09-27 | 2024-04-04 | 华为技术有限公司 | Antenna assembly and communication device |
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Application publication date: 20190618 |