CN104701623A - High-isolation MIMO (Multiple Input Multiple Output) antenna - Google Patents
High-isolation MIMO (Multiple Input Multiple Output) antenna Download PDFInfo
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- CN104701623A CN104701623A CN201410705130.5A CN201410705130A CN104701623A CN 104701623 A CN104701623 A CN 104701623A CN 201410705130 A CN201410705130 A CN 201410705130A CN 104701623 A CN104701623 A CN 104701623A
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Abstract
The invention discloses a high-isolation MIMO (Multiple Input Multiple Output) antenna, and belongs to the technical field of antennas. The whole antenna is symmetric around a central axis by a left and right mirror manner. The antenna comprises a rectangular dielectric substrate, a first radiator, a second radiator, a first microstrip feeder, a second microstrip feeder, an isolator, and a grounding plate which is equipped with a rectangular gap and arranged on the rear surface of the dielectric substrate, wherein the first radiator, the second radiator, the first microstrip feeder, the second microstrip feeder and the isolator are arranged on the front surface of the dielectric substrate. According to the antenna, the isolation performance of the system can be improved by the isolator; slots are formed in a floor, so that the bandwidth of the antenna can be increased; the problems of poor isolation, narrow frequency band and large size of the traditional MIMO antenna can be effectively reduced.
Description
Technical field
The invention belongs to antenna technical field, be specifically related to a kind of high-isolation MIMO (multiple-input and multiple-output) antenna.
Background technology
Radio MIMO technology is considered to one of key technology realizing following high-speed wideband wireless Internet access, can meet future mobile communications transmission rate at a high speed and the demand of wide coverage, have broad application prospects in mobile communication system.Traditional wireless communication system only adopts a transmitting antenna and a reception antenna usually, i.e. SISO (single-input single-output) system, its channel capacity is subject to the restriction of Shannon's theorems, and adopt the MIMO technology of multiple-input and multiple-output under not needing to increase spectral bandwidth or total transmitting power situation, adopt multi-antenna diversity technology, increase considerably data throughout and the transmission range of system.The key concept of MIMO technology effectively promotes the spectrum efficiency of wireless communication system for the spatial degrees of freedom utilizing many transmit antennas and many reception antennas and provide, and promotes message transmission rate and also improves communication quality.MIMO technology by diversity, compound and beam forming well in conjunction with utilization, achieve the maximization of the spatial frequency spectrum utilization of resources, and increase power system capacity by providing space division multiplexing gain, the information adopting MIMO technology to send in addition is in different space aspects, therefore additionally can not increase system bandwidth and transmitter gross power, be considered to the revolutionary technology in new generation broadband wireless communication system.
A link the most key in MIMO technology is the design of mimo antenna, the important component part that radiance is good, isolation is high, size is little, the antenna element of bandwidth is again mimo antenna.The method of current raising isolation is a lot, the design isolated structure etc. as adopted left-handed materials, on floor.The problems such as traditional mimo antenna ubiquity isolation is poor, frequency band is narrow, size is large, cannot meet its demand, limit the application in the field of wireless communication of MIMO technology for miniaturized mobile device.In Practical Project, also to consider the mutual coupling between antenna, polarization characteristic, how increase the problems such as the impedance bandwidth of antenna.
Within 2014, Wu Yan outstanding person waits people to propose " mimo antenna of the low SAR height isolation of thin space " (number of patent application CN201410270689.X; Shen Qing Publication day: 2014.09.03; Inventor: Wu Yanjie, Luo Wenbo, Wu Duolong), the mimo antenna of the low SAR height isolation of this thin space as shown in Figure 1, comprises substrate, described substrate top edge two ends are provided with the first metal radiation body, the second metal radiation body, two radiant bodies are all monopole antenna, lump loading capacitance and ground plate, and this antenna structure is simple, are easy to processing, but it is poor to there is isolation in this antenna, the problem that gain is lower.
Summary of the invention
The invention discloses a kind of high-isolation mimo antenna, this antenna comprises the element antenna of two specular, loading isolator between two element antennas makes the isolation performance of system strengthen, floor fluting makes the beamwidth of antenna increase, and the present invention is intended to the problem that isolation is poor, frequency band is narrow, size is large improving traditional mimo antenna existence.
The present invention is achieved through the following technical solutions:
A kind of mimo antenna with high-isolation, entire physical is along left and right, axis specular, comprise: Rectangular Enclosure with Participating Media substrate, be located at first radiant body in medium substrate front, the second radiant body, the first microstrip feed line, the second microstrip feed line and isolator, be located at the ground plate at the medium substrate back side, it is characterized in that:
Described first radiant body and the second radiant body to be arranged at about medium substrate upper end two jiaos respectively; Affiliated radiant body is plane E font metal patch, and its opening direction inwardly;
Described first microstrip feed line, the second microstrip feed line are elongated metal paster, and its one end is feed port, is positioned at the limit of medium substrate, and the other end connects the first radiant body, the second radiant body respectively;
Described ground plate is one with the rectangular metal floor of rectangular indentation, the long limit of its unslotted overlaps with the following of medium substrate, its minor face overlaps with the side of medium substrate, described rectangular indentation is positioned at the long limit central authorities of metal floor, described rectangular indentation effectively can improve the impedance matching of feed port, increases impedance bandwidth.
The microstrip line that described isolator is connection two microstrip feed lines, electrical length is 1/2nd guide wavelengths, can in and couple current, reduce port mutual coupling effect, for improving interport isolation.
The present invention by introducing isolator and reaching the object strengthening interport isolation and reduce antenna size in the mode of ground plate fluting between feeder line.Inventive antenna adopts microstrip-fed mode, is easy to be integrated in microwave planar circuit, is applicable to small type mobile devices.Compare the aerial arrays such as existing Unit four, Unit six, two element antennas of the present invention, ensureing that antenna impedance band achieves miniaturized design and has good radiation characteristic while wide.The present invention is provided with the advantages such as low-cross coupling, wide bandwidth, compact conformation, low cost simultaneously, cover WLAN wave band, and there is the feature of omnidirectional radiation, there is not black phenomenon under the blind area of signal or lamp, be applicable to very much being applied in hand-held terminal device or WLAN wireless router.
Accompanying drawing explanation
Fig. 1 is the structural representation of the mimo antenna of the low SAR height isolation of background technology thin space;
Fig. 2 is embodiment of the present invention antenna face structural representation;
Fig. 3 is embodiment of the present invention antenna structure schematic diagram;
Fig. 4 is isolation (S21) curve chart adding isolator Yu do not add isolator;
Fig. 5 is the measured drawing of antenna and the contrast of analogous diagram;
Fig. 6 is return loss (S11) curve chart adding isolator Yu do not add isolator.
Description of symbols in figure: medium substrate (1), the first radiant body (2a), the second radiant body (2b), the first microstrip feed line (3a), the second microstrip feed line (3b), isolator (4), ground plate (5), rectangular indentation (6).
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.
Medium substrate (1) material that antenna described in the present embodiment adopts is FR-4 (epoxy glass fiber plate), and substrate size is W × L, and thickness is h, wherein W=39mm, L=52mm, h=1.6mm.Be operated in WLAN frequency range, antenna adopts microstrip-fed mode, the length Wf=28mm of two microstrip feed lines, width W 1=2mm, and deposited copper thickness is 0.035mm.
Two radiant bodies in the present embodiment are E type planar microstrip metal patch, minor matters width 1.97mm, and deposited copper thickness is 0.035mm, and two radiant bodies lay respectively at two jiaos, the left and right of medium substrate (1) upper end, opening direction inwardly, specular arrange.As shown in Figure 2, wherein L1=10mm, L2=3mm, L3=10mm, L4=2.75mm.L1 and L3 determines low-frequency resonant frequency jointly, and L3 determines high-frequency resonant frequency, and L2, L4 are tuning minor matters, regulates impedance bandwidth.
Isolator in the present embodiment connects two microstrip feed lines, and closes on radiation patch, live width 0.3mm, and deposited copper thickness is 0.035mm.The working mechanism of isolator can make description below: one, the length of isolator is (n1+n2) × 2+n3=33mm, be about 1/2nd of the wavelength corresponding to 2.4GHz, be equivalent to a half-wave resonator, at 2.4GHz place, from a port (3a) flow to another port (3b) couple current can on isolator in and.Two, isolator can be regarded as and add a reflecting plate between antenna element, this reflecting plate effectively can block Antenna Operation when 5-6GHz, by the coupling caused by space radiation between antenna element, the isolation of antenna HFS therefore can be improved significantly.Three, isolator can regard a halfwave monopole sub antenna as, produces new resonance band as can be seen from Figure 6, add the bandwidth of HFS at 4.5GHz place.
The present embodiment adopts the ground plate with rectangular indentation, and ground plate is long is 52mm, and wide is 24mm, deposited copper thickness is 0.035mm, and rectangular indentation is of a size of SL × SW, wherein SL=9mm, SW=6mm, the object of rectangular indentation changes earth's surface CURRENT DISTRIBUTION, thus improve impedance bandwidth.
Fig. 4 is the analogous diagram of the present embodiment S21, gives the impact of introducing on isolation of isolator, and for 5-6GHz, when not introducing isolator, the isolation of antenna is less than-9.8dB, and after introducing isolator, the isolation of antenna is less than-15dB.Fig. 5 is the measured drawing of the present embodiment S21, and within the scope of whole working frequency range, the isolation of antenna is less than-15dB, meets design requirement.
Claims (3)
1. one kind has the mimo antenna of high-isolation, comprise: Rectangular Enclosure with Participating Media substrate, be located at first radiant body in medium substrate front, the second radiant body, the first microstrip feed line, the second microstrip feed line and isolator, be located at the ground plate at the medium substrate back side, it is characterized in that: described first radiant body and the second radiant body to be arranged at about medium substrate upper end two jiaos respectively; Described radiant body is plane E font metal patch, and its opening direction inwardly;
Described first microstrip feed line, the second microstrip feed line are elongated metal paster, its one end is feed port, is positioned at the lower limb of medium substrate, and the other end connects the first radiant body, the second radiant body respectively;
Described ground plate is the rectangular metal floor of band rectangular indentation, and the long limit of its unslotted overlaps with the lower limb of medium substrate, and its two minor face overlaps with the dual-side of medium substrate, and described rectangular indentation is positioned at the long limit central authorities of metal floor;
Described isolator is the microstrip line of connection two microstrip feed lines.
2. a kind of mimo antenna with high-isolation as claimed in claim 1, is characterized in that: entire physical is along left and right, axis specular.
3. a kind of mimo antenna with high-isolation as claimed in claim 1, is characterized in that: the electrical length of described isolator is 1/2nd guide wavelengths.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410705130.5A CN104701623A (en) | 2015-03-25 | 2015-03-25 | High-isolation MIMO (Multiple Input Multiple Output) antenna |
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| CN201410705130.5A CN104701623A (en) | 2015-03-25 | 2015-03-25 | High-isolation MIMO (Multiple Input Multiple Output) antenna |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106299602A (en) * | 2016-08-24 | 2017-01-04 | 重庆大学 | Super wide band plane single pole sub antenna array, communication device and terminal unit |
| CN106410406A (en) * | 2016-10-28 | 2017-02-15 | 福州大学 | Double-frequency low-profile tight-coupling and high-isolation MIMO antenna |
| CN106571525A (en) * | 2016-11-10 | 2017-04-19 | 捷开通讯(深圳)有限公司 | Antenna system used for optimizing isolation and mobile terminal |
| CN108493590A (en) * | 2018-01-15 | 2018-09-04 | 深圳市信维通信股份有限公司 | Antenna element, mimo antenna and handheld device |
| CN109103583A (en) * | 2018-09-11 | 2018-12-28 | 合肥联宝信息技术有限公司 | Antenna and electronic equipment |
| CN109586014A (en) * | 2017-09-28 | 2019-04-05 | 成都海澳科技有限公司 | A kind of monopole antenna that open rectangle is intracavitary |
| CN109994819A (en) * | 2019-03-25 | 2019-07-09 | 联想(北京)有限公司 | A kind of antenna, antenna system and electronic equipment |
| CN110752445A (en) * | 2019-10-25 | 2020-02-04 | 歌尔科技有限公司 | Antenna radiation system and communication terminal |
| CN111834748A (en) * | 2020-08-17 | 2020-10-27 | 阳光学院 | Structure and method for improving antenna isolation of MIMO system |
| CN111952724A (en) * | 2020-09-28 | 2020-11-17 | 西安电子科技大学 | Antenna module and electronic equipment |
| CN112838362A (en) * | 2021-01-04 | 2021-05-25 | 北京小米移动软件有限公司 | Antenna structure and terminal equipment |
| CN113346238A (en) * | 2021-04-27 | 2021-09-03 | 荣耀终端有限公司 | Antenna module and electronic equipment |
| CN113571891A (en) * | 2021-07-27 | 2021-10-29 | 山东建筑大学 | Dual-frequency broadband MIMO antenna and working method thereof |
| CN113659306A (en) * | 2020-05-12 | 2021-11-16 | 西安电子科技大学 | Antenna device and electronic apparatus |
| CN114696085A (en) * | 2020-12-30 | 2022-07-01 | 中国移动通信集团终端有限公司 | MIMO antenna and terminal |
| CN114824805A (en) * | 2022-05-06 | 2022-07-29 | 青岛鼎信通讯股份有限公司 | Built-in antenna applied to carrier communication module |
| CN115149246A (en) * | 2021-03-30 | 2022-10-04 | 华为技术有限公司 | Antenna and terminal equipment |
| WO2023244088A1 (en) * | 2022-06-17 | 2023-12-21 | 엘지이노텍(주) | Multiple antenna |
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Cited By (31)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106299602A (en) * | 2016-08-24 | 2017-01-04 | 重庆大学 | Super wide band plane single pole sub antenna array, communication device and terminal unit |
| CN106410406A (en) * | 2016-10-28 | 2017-02-15 | 福州大学 | Double-frequency low-profile tight-coupling and high-isolation MIMO antenna |
| US10763577B2 (en) | 2016-11-10 | 2020-09-01 | Jrd Communication (Shenzhen) Ltd | Antenna system for optimizing isolation and mobile terminal |
| CN106571525A (en) * | 2016-11-10 | 2017-04-19 | 捷开通讯(深圳)有限公司 | Antenna system used for optimizing isolation and mobile terminal |
| WO2018086424A1 (en) * | 2016-11-10 | 2018-05-17 | 捷开通讯(深圳)有限公司 | Antenna system having optimized isolation, and mobile terminal |
| CN109586014A (en) * | 2017-09-28 | 2019-04-05 | 成都海澳科技有限公司 | A kind of monopole antenna that open rectangle is intracavitary |
| CN108493590A (en) * | 2018-01-15 | 2018-09-04 | 深圳市信维通信股份有限公司 | Antenna element, mimo antenna and handheld device |
| CN108493590B (en) * | 2018-01-15 | 2020-02-11 | 深圳市信维通信股份有限公司 | Antenna unit, MIMO antenna and handheld device |
| US10950953B2 (en) | 2018-01-15 | 2021-03-16 | Shenzhen Sunway Communication Co., Ltd. | Antenna unit, MIMO antenna and handheld device |
| CN109103583A (en) * | 2018-09-11 | 2018-12-28 | 合肥联宝信息技术有限公司 | Antenna and electronic equipment |
| CN109103583B (en) * | 2018-09-11 | 2024-05-28 | 合肥联宝信息技术有限公司 | Antenna and electronic equipment |
| CN109994819A (en) * | 2019-03-25 | 2019-07-09 | 联想(北京)有限公司 | A kind of antenna, antenna system and electronic equipment |
| CN109994819B (en) * | 2019-03-25 | 2020-06-23 | 联想(北京)有限公司 | Antenna, antenna system and electronic equipment |
| CN110752445A (en) * | 2019-10-25 | 2020-02-04 | 歌尔科技有限公司 | Antenna radiation system and communication terminal |
| CN113659306A (en) * | 2020-05-12 | 2021-11-16 | 西安电子科技大学 | Antenna device and electronic apparatus |
| CN111834748A (en) * | 2020-08-17 | 2020-10-27 | 阳光学院 | Structure and method for improving antenna isolation of MIMO system |
| CN111952724A (en) * | 2020-09-28 | 2020-11-17 | 西安电子科技大学 | Antenna module and electronic equipment |
| CN111952724B (en) * | 2020-09-28 | 2022-11-08 | 西安电子科技大学 | Antenna module and electronic equipment |
| CN114696085A (en) * | 2020-12-30 | 2022-07-01 | 中国移动通信集团终端有限公司 | MIMO antenna and terminal |
| CN114696085B (en) * | 2020-12-30 | 2024-08-27 | 中国移动通信集团终端有限公司 | MIMO antenna and terminal |
| CN112838362A (en) * | 2021-01-04 | 2021-05-25 | 北京小米移动软件有限公司 | Antenna structure and terminal equipment |
| CN115149246A (en) * | 2021-03-30 | 2022-10-04 | 华为技术有限公司 | Antenna and terminal equipment |
| WO2022206682A1 (en) * | 2021-03-30 | 2022-10-06 | 华为技术有限公司 | Antenna and terminal device |
| CN115149246B (en) * | 2021-03-30 | 2023-11-17 | 华为技术有限公司 | Antenna and terminal equipment |
| CN113346238B (en) * | 2021-04-27 | 2022-06-24 | 荣耀终端有限公司 | Antenna module and electronic equipment |
| CN113346238A (en) * | 2021-04-27 | 2021-09-03 | 荣耀终端有限公司 | Antenna module and electronic equipment |
| CN113571891A (en) * | 2021-07-27 | 2021-10-29 | 山东建筑大学 | Dual-frequency broadband MIMO antenna and working method thereof |
| CN113571891B (en) * | 2021-07-27 | 2023-09-08 | 山东建筑大学 | Dual-frequency broadband MIMO antenna and working method thereof |
| CN114824805A (en) * | 2022-05-06 | 2022-07-29 | 青岛鼎信通讯股份有限公司 | Built-in antenna applied to carrier communication module |
| CN114824805B (en) * | 2022-05-06 | 2024-02-27 | 青岛鼎信通讯股份有限公司 | Built-in antenna applied to carrier communication module |
| WO2023244088A1 (en) * | 2022-06-17 | 2023-12-21 | 엘지이노텍(주) | Multiple antenna |
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Application publication date: 20150610 |