CN202058854U - MIMO antenna structure realizing multi-frequency high isolation - Google Patents
MIMO antenna structure realizing multi-frequency high isolation Download PDFInfo
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- CN202058854U CN202058854U CN 201020647596 CN201020647596U CN202058854U CN 202058854 U CN202058854 U CN 202058854U CN 201020647596 CN201020647596 CN 201020647596 CN 201020647596 U CN201020647596 U CN 201020647596U CN 202058854 U CN202058854 U CN 202058854U
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Abstract
The utility model discloses an MIMO antenna structure realizing multi-frequency high isolation, comprising a medium base plate and a grounding plate, wherein the grounding plate is below the medium base plate, and also comprising at least two antennas disposed on the periphery of the medium base plate, wherein each antenna comprises a capacitance coupling feed portion, a grooving bending radiation fin portion and a bending line grounding portion, the capacitance coupling feed portion is located above the medium substrate, the bending line grounding portion is located below the medium substrate, the two ends of the bending line grounding portion are respectively connected with the grooving bending radiation fin portion and the grounding plate, and the position of the connecting point of the bending line grounding portion and the grounding plate is adjustable. Compared with the prior art, the MIMO antenna structure may realize the high isolation of antennas in multiple frequency ranges, the bandwidth is further increased, the excellent radiation performance of the antennas is kept at the same time, and the structure is compact enough to be put in communication devices such as a mobile phone.
Description
Technical field
The utility model relates to a kind of antenna structure, particularly a kind of MIMO antenna structure of realizing the multifrequency high-isolation.
Background technology
In multiaerial system, need to use a plurality of receptions and transmitting antenna, the coupling between the antenna can reduce the radiance of antenna, and therefore influences the performance of whole system.Especially in handheld device (as mobile phone), the gap between the antenna is very little, and it is very strong to be coupled, if the isolation technology that can not adopt is eliminated the coupling between antenna, equipment is cisco unity malfunction,
At present, the height isolation that realizes placing between the very near antenna has been subjected to the attention of a lot of companies and research institution, and has proposed several main methods in succession:
Employing is at the ground plate fluting or add defect ground structure.Utilize groove or defective ground (DGS) on the ground plate can produce the band inhibition effect, thus the coupling between the suppressing antenna.But this method also faces very big problem: because ground plate needs to be connected with a lot of electric components, the mobile phone engineer does not generally allow to change the structure of ground plate.Therefore implement and be not easy.
Adopt electromagnetic bandgap structure (EBG).EBG can suppress surface wave propagation, therefore can reduce the coupling between antenna.But also there is very big shortcoming this aspect: the EBG structure is too big, is not suitable for mobile device.
Adopt port decoupling and matching process.A passive decoupling device (directional coupler or branch line coupler) and matching network are added to the port of antenna.But the shortcoming of this method is: increased the complexity of design, passive device will occupy very big space, and matching network can be introduced loss.
The source is N. Lopez, C. – J. Lee, A. Gummalla, and M. Achour, " Compact metamaterial antenna array for long term evolution (LTE) handset application; " IEEE International Workshop on Antenna Technology, 2009 Compact Metamaterial Antenna Array for Long Term Evolution (LTE) Handset Application has proposed the method for a kind of super material antenna in conjunction with monopole antenna: every antenna is combined by a super material antenna and monopole, its objective is spread bandwidth.By rational placement, can in the frequency band of LTE700, realize good isolation, still, this antenna can only be realized the isolation in the frequency band, and bandwidth is still wide inadequately.And ((in 1710 ~ 2170MHz) frequency ranges, its structure can not be done very for a short time, illegally is positioned over the handset device the inside for 746 ~ 960MHz) frequency ranges and GSM1800/1900/UMTS at LTE/GSM850/900.
At present, wireless communication standard is a lot, and shared frequency range is also inequality.A lot of frequency ranges are very close, as existing C DMA800, GSM900.And the U.S. also gives LTE with the frequency allocation of 700MHz.In mobile device, in order to save the space, an antenna need cover a plurality of frequency ranges.For the frequency range of closing on, many times be to adopt an antenna to cover.Just need realize high-isolation this moment in the bandwidth than broad.Between above-mentioned reason, need a kind of height isolation that can in a plurality of frequency ranges, realize antenna this moment, and further improve bandwidth, keep the good radiance of antenna simultaneously, and compact conformation, can put into the antenna structure of communication apparatus such as mobile phone.
The utility model content
The purpose of this utility model is exactly to provide a kind of height of antenna of can realizing in a plurality of frequency ranges to isolate for the defective that overcomes above-mentioned prior art existence, and further improve bandwidth, keep the good radiance of antenna simultaneously, and compact conformation can be put into the antenna structure of communication apparatus such as mobile phone.
A kind of MIMO antenna structure of realizing the multifrequency high-isolation comprises medium substrate, ground plate, and described ground plate also comprises at least two antennas below described medium substrate, those antennas be distributed in medium substrate around,
Each antenna comprises: capacitive coupling feed part, fluting bending radiation fin part, folding line grounded part; Described capacitive coupling feed partly is positioned at the top of described medium substrate; Described folding line grounded part is positioned at the below of described medium substrate, and the two ends of described folding line grounded part connect described fluting bending radiation fin part and described ground plate respectively; The position of the tie point of described folding line grounded part and described ground plate is adjustable; Described fluting bending radiation fin partly has groove, and the width-adjustable of described groove; Described fluting bending radiant section is divided into two parts by described groove, and described two parts produce two resonance with described folding line grounded part respectively.
Preferably, above-mentioned a kind of MIMO antenna structure of realizing the multifrequency high-isolation, the number that comprises antenna is two, these two antennas are on two adjacent angles of described medium substrate, and described antenna is relatively positive each other.
Preferably, described fluting bending radiation fin partly comprises first, second and the 3rd; Described first face is positioned at the below of described medium substrate, and described first lateral surface along described medium substrate upwards be bent to form second, and described second face horizontal direction once more is bent to form the 3rd;
Preferably, described capacitive coupling feed part has coincidence in the position above the described medium substrate with position above described fluting bending radiation fin first corresponding medium substrate partly.
Preferably, described fluting bending radiation fin part and the common resonance that forms two frequency ranges of folding line grounded part: the resonance of the resonance of LTE/GSM850/900 (746-960MHz) frequency range, GSM1800/1900/UMTS (1710-2170MHz) frequency range.
Preferably, described fluting bending radiation fin partly has bar-shaped trough/L shaped groove/U-lag; The broadband of described bar-shaped trough/L shaped groove/U-lag is adjustable.
Preferably, described capacitive coupling current feed department branch comprises capacitive coupling feeder line, microstrip feed line; Described capacitive coupling feeder line is connected with described microstrip feed line
The adjustable length of described capacitive coupling feeder line; The capacitive coupling feeder line of described capacitive coupling feed part has coincidence in the position above the described medium substrate with position above described fluting bending radiation fin first corresponding described medium substrate partly.
Preferably, described capacitive coupling current feed department branch comprises microstrip feed line, lumped parameter electric capacity; Described lumped parameter electric capacity is connected with described microstrip feed line; Described microstrip feed line first by via hole and described fluting bending radiation fin part links to each other.
Preferably, described folding line grounded part is a narrow bending bar.
Preferably, described folding line grounded part is a lumped parameter inductance, and described lumped parameter inductance connects described fluting bending radiation fin part and described ground plate respectively by a lead.
Compared with prior art, the utlity model has following advantage:
The first, the utility model can be worked in LTE/GSM850/900 (746-960MHz) frequency range and two frequency ranges of GSM1800/1900/UMTS (1710-2170MHz) frequency range, has avoided the prior art can only be in the shortcoming of single frequency band work.
The second, the folded antenna of the utility model by distributing and have particular design on substrate makes can keep high isolation between each antenna.
The 3rd, the bandwidth ratio prior art of antenna has obtained further raising in the utility model, and can keep the good radiance of antenna simultaneously,
The 4th, the utility model compact conformation can be put into communication apparatus such as mobile phone.
Description of drawings
Fig. 1 is the structural representation of the utility model specific embodiment;
Fig. 2 is the partial schematic diagram after first antenna of an embodiment of the present invention turns over 180 degree;
Fig. 3 is the fluting bending radiation fin portion size schematic diagram after first antenna of an embodiment of the present invention turns over 180 degree;
Fig. 4 is the circuit equivalent figure of first antenna of a kind of embodiment of the present invention;
Fig. 5 is the return loss plot of first antenna of a kind of embodiment of the present invention;
Fig. 6 is first antenna of a kind of embodiment of the present invention, the simulation result figure of second antenna;
Fig. 7 is the radiation effect figure of first antenna of a kind of embodiment of the present invention.
Embodiment
The below is described further the utility model in conjunction with the accompanying drawings and embodiments:
As Fig. 1, a kind of MIMO antenna structure of realizing the multifrequency high-isolation comprises: medium substrate 4, ground plate 5, first antenna 001, second antenna 002; Described ground plate 5 is below described medium substrate 4.
First antenna, 001, the second antenna 002 has identical structure.
As Fig. 2, be example with first antenna 001, for convenience of description, first antenna 001 is turned over 180 degree observed afterwards, first antenna comprises: capacitive coupling feed part 1, fluting bending radiation fin part 2, folding line grounded part 3.
As Fig. 2, described fluting bending radiation fin part 2 comprises first 21, second 22, the 3rd 23.First 21 below that is positioned at medium substrate 4, and described first 21 lateral surface along described medium substrate 4 upwards be bent to form second 22, described second 22 once more horizontal direction be bent to form the 3rd 23.First 21 of described fluting bending radiation fin part 2 has bar-shaped trough 211, and the width-adjustable of described groove 211; Described groove 211 is described first 21 separated into two parts 214,215.Described 214,215 shape also has a lot of examples that change, and the corresponding shape on the present embodiment accompanying drawing only is that the present invention does not make qualification to this for example.The utility model in concrete enforcement, open on the fluting bending radiation fin part 2 except can being split into bar-shaped trough 211, can also be split into L shaped groove or U-lag; Only for giving an example, the utility model is not made qualification to bar-shaped trough to this herein.As Fig. 3, the correspondence of described fluting bending radiation fin part 2 is of a size of L1, L2, W1, W2, H1; Wherein L1 is first 21, second 22, the 3rd 23 a length, W1 be first 21, second 22, the 3rd 23 width and, H1 is second 22 a width, is first 21 and the 3rd 's 23 vertical range; L2, W2 are the length of the bar-shaped trough 211 opened on first 21 and wide.In the present embodiment, L1 is 20mm, and W1 is 13.8mm, and L2 is 16mm, and W2 is 3mm, and H1 is 5mm.
As Fig. 2, described capacitive coupling feed part 1 is positioned at the top of described medium substrate 4; It comprises capacitive coupling feeder line 11, microstrip feed line 12; Described capacitive coupling feeder line 11 is connected with described microstrip feed line 12.There is coincidence the position of the capacitive coupling feeder line 11 of described capacitive coupling feed part 1 above first 21 corresponding medium substrate 4 of the position above the described medium substrate 4 and described fluting bending radiation fin part 2.
Described folding line grounded part 3 is bending, is one to have the narrow bending bar of certain-length and width, and the two ends of described folding line grounded part 3 connect described fluting bending radiation fin part 2 and described ground plate 5 respectively.The part 214 of first 21 close folding line grounded part 3 of fluting bending radiation fin part 2 produces the GSM1800/1900/UMTS (resonance of 1710 ~ 2170MHz) frequency ranges with folding line grounded part 3; Another part of first 21 215 of fluting bending radiation fin part 2, second 22, the 3rd 23 and described folding line grounded part 3 produce the resonance of LTE/GSM850/900 (746 ~ 960 MHz) frequency ranges.I.e. fluting bending radiation fin part 2 and the folding line grounded part 3 common LC double-frequency resonance devices that form.Regulate the position of the tie point P of folding line grounded part 3 and ground plate 3, the length of the capacitive coupling feeder line 11 of capacitive coupling feed part 1, and the width W 2 of the bar-shaped trough 211 of fluting bending radiation fin part 2 just can make the bandwidth maximization of antenna.
Described microstrip feed line 12 is 50 ohm of feeder lines; The end of described microstrip feed line 12 and described capacitive coupling feeder line 11 form the branch of T font, to increase the electric capacity of coupling unit.The electric capacity of coupling unit by the T type branch of medium substrate 4 tops with and first 21 of its corresponding fluting bending radiation fin part 2 form.Regulate the size of first 21 relative position scalable coupling capacitance of T type branch and fluting bending radiation fin part 2.Fig. 4 is an equivalent circuit diagram of the present invention, at first, is that described microstrip feed line 12 is input to energy source on the described capacitive coupling feeder line 11 from 50 ohm of feeder lines; The tie point of described 50 ohm of feeder lines and described capacitive coupling feeder line 11 is equivalent to the distributing point 001 of 50 ohm of feeder lines; First 21 by capacitive coupling feeder line 11 and fluting bending radiation fin part 2 forms coupling capacitance 002; Above-mentioned energy source is through after the coupling capacitance 002, be coupled in two frequency ranges of antenna after, be radiated.Above-mentioned two frequency ranges, forming LC double-frequency resonance device 003 by fluting bending radiation fin part 2 jointly with folding line grounded part 3 provides.
Wherein medium substrate 4 is for comprising certain-length, the medium substrate of width and thickness.In the present embodiment, medium substrate 4 long 115mm, wide 40mm, thickness 0.8mm, dielectric constant 4.4, loss angle 0.02.
Wherein ground plate 5 is the metal ground the same with medium substrate 4 width, and length is slightly less than the length of medium substrate 4, to form the headroom district of certain width.In the present embodiment, ground plate 5 long 100mm, wide 40mm, headroom district 15mm.
Fig. 5 is the return loss of first antenna 001.3: 1 bandwidth of VSWR satisfy LTE/GSM850/900 (746 ~ 960 MHz) and GSM1800/1900/UMTS (1710 ~ 2170MHz) requirements.The radiation efficiency of typical frequencies is as shown in the table:
| Frequency | 744MHz | 960MHz | 1740MHz | 2160MHz |
| Radiation efficiency | 52.89％ | 70.59％ | 74.57％ | 63.43％ |
The frequency range of first antenna, 001 present embodiment is LTE/GSM850/900 (746 ~ 960 MHz) and GSM1800/1900/UMTS (1710 ~ 2170MHz); Be of a size of 20 mm * 15 mm * 5mm.
In order to verify validity of the present utility model, first antenna 001, second antenna 002 have been carried out emulation, as Fig. 6, S11 refers to the return loss of first antenna 1; S22 refers to the return loss of second antenna 2, and S21 refers to the isolation between first antenna 1 and second antenna 2; Effective working frequency range of two antennas is positioned at 746-960MHz as can be seen from Figure 6, in this frequency range, isolates all less than-12dB, and bandwidth has reached 25%.At high band, antenna can cover 1710-2170MHz, and bandwidth has reached 24%, in this frequency range, isolates all less than-14dB.Fig. 7 is the radiation effect figure of the utility model specific embodiment first antenna, can see, first antenna all has radiation efficiency preferably in these two frequency ranges.The radiation effect of second antenna is with the radiation effect of first antenna.
In the present embodiment, the number of antenna is two, and only for giving an example, the utility model is not made qualification to the quantity of antenna.
In the present embodiment, the position of antenna is positioned on two adjacent angles of substrate, and only for giving an example, antenna also can be distributed in any position all around of medium substrate here, and the utility model is not made qualification to the particular location of antenna.
The utility model preferred embodiment just is used for helping to set forth the utility model.Preferred embodiment does not have all details of detailed descriptionthe, does not limit this utility model yet and only is described embodiment.Obviously, according to the content of this specification, can make many modifications and variations.These embodiment are chosen and specifically described to this specification, is in order to explain principle of the present utility model and practical application better, thereby the technical field technical staff can utilize the utility model well under making.The utility model only is subjected to the restriction of claims and four corner and equivalent.More than disclosed only be several specific embodiments of the application, but the application is not limited thereto, any those skilled in the art can think variation, all should drop in the application's the protection range.
Claims (9)
1. a MIMO antenna structure of realizing the multifrequency high-isolation comprises medium substrate, ground plate, and described ground plate is characterized in that below described medium substrate, also comprises at least two antennas, those antennas be distributed in medium substrate around,
Each antenna comprises: capacitive coupling feed part, fluting bending radiation fin part, folding line grounded part; Described capacitive coupling feed partly is positioned at the top of described medium substrate; Described folding line grounded part is positioned at the below of described medium substrate, and the two ends of described folding line grounded part connect described fluting bending radiation fin part and described ground plate respectively; The position of the tie point of described folding line grounded part and described ground plate is adjustable; Described fluting bending radiation fin partly has groove, and the width-adjustable of described groove; Described fluting bending radiant section is divided into two parts by described groove, and described two parts produce two resonance with described folding line grounded part respectively.
2. a kind of MIMO antenna structure of realizing the multifrequency high-isolation as claimed in claim 1, the number that comprises antenna is two, these two antennas are on two adjacent angles of described medium substrate, and described antenna is relatively positive each other.
3. a kind of MIMO antenna structure of realizing the multifrequency high-isolation as claimed in claim 1 or 2 is characterized in that, described fluting bending radiation fin partly comprises first, second and the 3rd; Described first face is positioned at the below of described medium substrate, and described first lateral surface along described medium substrate upwards be bent to form second, and described second face horizontal direction once more is bent to form the 3rd;
Described capacitive coupling feed part has coincidence in the position above the described medium substrate with position above described fluting bending radiation fin first corresponding medium substrate partly.
4. a kind of MIMO antenna structure of realizing the multifrequency high-isolation according to claim 1 and 2 is characterized in that: described fluting bending radiation fin part and the common resonance that forms two frequency ranges of folding line grounded part: the resonance of the resonance of LTE/GSM850/900 (746-960MHz) frequency range, GSM1800/1900/UMTS (1710-2170MHz) frequency range.
5. according to claim 1 or 3 described a kind of MIMO antenna structures of realizing the multifrequency high-isolation, it is characterized in that: described fluting bending radiation fin partly has bar-shaped trough/L shaped groove/U-lag; The broadband of described bar-shaped trough/L shaped groove/U-lag is adjustable.
6. according to claim 1 or 3 described a kind of MIMO antenna structures of realizing the multifrequency high-isolation, it is characterized in that: described capacitive coupling current feed department branch comprises capacitive coupling feeder line, microstrip feed line; Described capacitive coupling feeder line is connected with described microstrip feed line
The adjustable length of described capacitive coupling feeder line; The capacitive coupling feeder line of described capacitive coupling feed part has coincidence in the position above the described medium substrate with position above described fluting bending radiation fin first corresponding described medium substrate partly.
7. according to claim 1 or 3 described a kind of MIMO antenna structures of realizing the multifrequency high-isolation, it is characterized in that: described capacitive coupling current feed department branch comprises microstrip feed line, lumped parameter electric capacity; Described lumped parameter electric capacity is connected with described microstrip feed line; Described microstrip feed line first by via hole and described fluting bending radiation fin part links to each other.
8. a kind of MIMO antenna structure of realizing the multifrequency high-isolation according to claim 1 is characterized in that: described folding line grounded part is a narrow bending bar.
9. a kind of MIMO antenna structure of realizing the multifrequency high-isolation according to claim 1, it is characterized in that: described folding line grounded part is a lumped parameter inductance, and described lumped parameter inductance connects described fluting bending radiation fin part and described ground plate respectively by a lead.
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| CN103199332A (en) * | 2013-03-27 | 2013-07-10 | 上海安费诺永亿通讯电子有限公司 | Built-in multi-band LTE multiple input and multiple output (MIMO) antenna |
| CN103247867A (en) * | 2012-02-14 | 2013-08-14 | 启碁科技股份有限公司 | Radio frequency device, wireless communication device and method for improving isolation degrees of antennae |
| WO2013159430A1 (en) * | 2012-04-23 | 2013-10-31 | 中兴通讯股份有限公司 | Multi-antenna terminal |
| WO2014063503A1 (en) * | 2012-10-25 | 2014-05-01 | 上海安费诺永亿通讯电子有限公司 | Broadband lte antenna suitable for notebook computer or tablet computer |
| CN104022353A (en) * | 2014-06-12 | 2014-09-03 | 电子科技大学 | Multi-band MIMO antenna used for intelligent machine |
| WO2014161327A1 (en) * | 2013-07-17 | 2014-10-09 | 中兴通讯股份有限公司 | Mimo antenna, terminal and method for increasing isolation therefor |
| CN104157969A (en) * | 2014-08-15 | 2014-11-19 | 西安电子科技大学 | Broadband MIMO dual-antenna based on adjusting impedance matching technology |
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| WO2014063503A1 (en) * | 2012-10-25 | 2014-05-01 | 上海安费诺永亿通讯电子有限公司 | Broadband lte antenna suitable for notebook computer or tablet computer |
| TWI497824B (en) * | 2012-11-06 | 2015-08-21 | Wistron Neweb Corp | Decoupling circuit and antenna device |
| CN103199332A (en) * | 2013-03-27 | 2013-07-10 | 上海安费诺永亿通讯电子有限公司 | Built-in multi-band LTE multiple input and multiple output (MIMO) antenna |
| CN103199332B (en) * | 2013-03-27 | 2015-11-25 | 上海安费诺永亿通讯电子有限公司 | A kind of built-in multiple frequency band LTE mimo antenna |
| WO2014161327A1 (en) * | 2013-07-17 | 2014-10-09 | 中兴通讯股份有限公司 | Mimo antenna, terminal and method for increasing isolation therefor |
| US9601826B2 (en) | 2013-07-17 | 2017-03-21 | Zte Corporation | MIMO antenna, terminal and method for improving isolation |
| CN104022353A (en) * | 2014-06-12 | 2014-09-03 | 电子科技大学 | Multi-band MIMO antenna used for intelligent machine |
| CN104157969B (en) * | 2014-08-15 | 2017-02-08 | 西安电子科技大学 | Broadband MIMO dual-antenna based on adjusting impedance matching technology |
| CN104157969A (en) * | 2014-08-15 | 2014-11-19 | 西安电子科技大学 | Broadband MIMO dual-antenna based on adjusting impedance matching technology |
| CN106935971B (en) * | 2015-12-29 | 2021-02-09 | 华为技术有限公司 | Antenna and communication apparatus |
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| CN105470636B (en) * | 2015-12-30 | 2018-09-07 | 福建省汇创新高电子科技有限公司 | Applied to WLAN double frequency high-isolation MIMO directional aerials |
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| CN105680175A (en) * | 2016-01-11 | 2016-06-15 | 复旦大学 | Compact type multi-band MIMO mobile phone antenna |
| CN105826657B (en) * | 2016-05-19 | 2018-08-21 | 中国计量大学 | A kind of ferrite film multiple-input and multiple-output antenna for mobile phone |
| CN105826657A (en) * | 2016-05-19 | 2016-08-03 | 中国计量大学 | Ferrite film multiple-input multiple-output mobile phone antenna |
| CN107994344B (en) * | 2016-10-21 | 2019-01-11 | 环旭电子股份有限公司 | Dual-band antenna module |
| CN107994344A (en) * | 2016-10-21 | 2018-05-04 | 环旭电子股份有限公司 | Dual-band antenna module |
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| CN112751196B (en) * | 2020-12-28 | 2023-10-13 | 深圳市信维通信股份有限公司 | Compact 5G MIMO antenna module and mobile terminal |
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