CN104733856A - MIMO antenna decoupled through three gaps - Google Patents
MIMO antenna decoupled through three gaps Download PDFInfo
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- CN104733856A CN104733856A CN201510102787.7A CN201510102787A CN104733856A CN 104733856 A CN104733856 A CN 104733856A CN 201510102787 A CN201510102787 A CN 201510102787A CN 104733856 A CN104733856 A CN 104733856A
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Abstract
The invention discloses an MIMO antenna decoupled through three gaps. The MIMO antenna comprises a dielectric substrate, and a first monopole, a second monopole, a first microstrip line and a second microstrip line are printed on the front face of the dielectric substrate, wherein the first monopole and the second monopole are symmetrical with respect to the center line of the dielectric substrate, and the first microstrip line and the second microstrip line are symmetrical with respect to the center line of the dielectric substrate; the first monopole and the second monopole are connected with the first microstrip line and the second microstrip line respectively; a first grounded branch knot and a second grounded branch knot are printed on the back face of the dielectric substrate and are symmetric with respect to the center line of the dielectric substrate, and the first microstrip line is connected with the second microstrip line through a connecting line, and a system floor is further printed on the back face of the dielectric substrate and is embedded into the three gaps. The MIMO antenna is simple in structure, convenient to debug, clear in working mode and suitable for various multifunctional small-size handheld mobile devices.
Description
Technical field
The present invention relates to a kind of mobile terminal antenna, particularly a kind of mimo antenna utilizing three gap decoupling zeros.
Background technology
Along with the develop rapidly of mobile communication technology, 2G, 3G mobile communication system has been difficult to meet the growing demand of user.Fourth generation mobile communication systems (4G) and technology have become study hotspot that is current and future mobile communications field.Compared with existing network, 4G mobile communication wireless network not only has the higher availability of frequency spectrum and data rate, but also global seamless roaming can be realized, multimedia service can be provided, there is higher fail safe, flexibility, intelligent and higher transmission quality and service quality, asymmetry business can be supported, and can multiple business be supported.
Mimo antenna is the key technology of MIMO mobile communication system.For base station system, because free space is large, the application of multi-antenna technology very easily realizes, and has also realized at present and has used.But for small hand-held mobile communication equipment, be integrated in narrow space by multiple antenna, can cause very large mutual coupling, the performance of antenna just declines thereupon, thus channel capacity cannot be realized along with the increase of number of antennas and increase with linear scale.How reducing antenna array size, the coupling reduced between antenna element is simultaneously the difficult point of mimo antenna design.Instantly mainly contain following several method and can improve isolation between antenna element: in employing and line technology realize between antenna element decoupling zero; Utilize the mutual coupling that floor minor matters reduction floor surface ripple causes; Decoupling network is added at antenna feed place; Between antenna element, add reflector element etc., but these decoupling method major parts are only useful in narrow frequency range or high band decoupling, and in actual mobile terminal system, need to take into account low frequency mode, therefore most of decoupling method cannot practical requirement.Therefore design low coupling, broadband, small size and the easy handhold mobile terminal equipment mimo antenna regulated to have very important significance.
Summary of the invention
In order to overcome shortcoming and the deficiency of prior art existence, the invention provides a kind of mimo antenna utilizing three gap decoupling zeros, this mimo antenna structure is simple, and it is easy to make, and has the advantages such as low coupling, broadband, small size and easy adjustment.
The present invention adopts following technical scheme:
A kind of mimo antenna utilizing three gap decoupling zeros, comprise medium substrate, the printing of described medium substrate front is about first of medium substrate center line symmetry, second monopole and the first microstrip line about medium substrate center line symmetry, second microstrip line, described first, second monopole is respectively with first, second microstrip line connects, be printed on the medium substrate back side about first of medium substrate center line symmetry, second ground connection minor matters, described first, second microstrip line is connected by connecting line, also print system floor, the described medium substrate back side, described system floor embeds three gaps.
Described first monopole and the first ground connection minor matters form the first coupled structure, and described second monopole and the second ground connection minor matters form the second coupled structure.
Three gaps crossed over by described first microstrip line and the second microstrip line, and described first microstrip line, the second microstrip line and connecting line and three articles of gaps form the 3rd coupled structure.
The characteristic impedance of described first microstrip line and the second microstrip line is 50 ohm.
Described three gaps comprise first, second and third gap, and the width in the middle part of described second gap is greater than the width at the second two ends, gap.
Described first monopole and described first ground connection minor matters form the first antenna element, and described second monopole and described second ground connection minor matters form the second antenna element.
Beneficial effect of the present invention:
(1) compared with the existing slit design be applied in mimo antenna, the isolation between mimo antenna unit effectively can be improved in three gaps that the present invention proposes in wider bandwidth of operation;
(2) three gaps in the present invention can the corresponding frequency band of independent regulation, and affect little between different frequency bands, three gaps are combined the high-isolation be achieved in broad frequency band;
(3) mimo antenna structure of the present invention is simple, and debugging is convenient, and mode of operation is clear, is suitable for in various multifunctional small-size handheld mobile device.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is parameter schematic diagram of the present invention;
Fig. 3 is the return loss plot that the present invention emulates;
Fig. 4 is the isolation figure that the present invention emulates.
Shown in figure:
1a-first ground connection minor matters, 1b-second ground connection minor matters, 2a-first monopole, 2b-second monopole, 3a-first microstrip line, 3b-second microstrip line, 4-first gap, 5-second gap, 6-the 3rd gap, 7-connecting line, 8-system floor.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, a kind of mimo antenna utilizing three gap decoupling zeros, comprise medium substrate, be printed on the system floor 8 at the medium substrate back side, first, second ground connection minor matters 1a, 1b, described system floor embeds three gaps 4, 5, 6, be specially first, second and third gap, described three interstitial water placing flat, be parallel to each other, wherein the middle part width in the second gap 5 is greater than the width in gap, two ends, be printed on first of medium substrate front, second monopole 2a, 2b and first, second microstrip line 3a, 3b, described first, second ground connection minor matters 1a, 1b, first, second monopole 2a, 2b and first, second microstrip line 3a, 3b is all symmetrical about medium substrate center line, described first, second monopole 2a, 2b is respectively with first, second microstrip line 3a, 3b connects, described first, second microstrip line is connected by connecting line 7, the characteristic impedance of described two microstrip lines is 50 ohm.
The two sides that the present invention first monopole and the first ground connection minor matters are positioned at medium substrate forms the first coupled structure, first monopole and the second ground connection minor matters form the second coupled structure, first, second coupled structure introduces extra electric capacity to antenna, thus effectively increase the electrical length of antenna, reduce the physical size of antenna.Under the feeder line effect of first, second microstrip line, form a wider bandwidth, by concrete adjustment, return loss can be realized in 1.71GHz-2.69GHz and be less than-10dB.
System floor embeds three gaps, wherein wide in the middle of the second gap 5, both sides are narrow, three gaps crossed over by connecting line, first, second microstrip line, form the 3rd coupled structure, under the feed of the 3rd coupled structure, article three, the effect that the coupling path that gap is formed produces is contrary with the effect that the original coupling path of mimo antenna produces, therefore original coupling between mimo antenna unit can be offset, improve the isolation between mimo antenna unit, namely realize decoupling zero.Article three, the distance between the length in gap and width and adjacent slits, and the distance on three gaps and connecting line distance medium substrate top is not particularly limited, according to concrete frequency adjustment.
It is 0.02 that the present embodiment adopts relative dielectric constant to be 4.4 loss angle tangents, and thickness is the FR4 medium substrate of 0.8mm, and the planar dimension of medium substrate is 100mm × 60mm.
The width of the first microstrip line and the second microstrip line is 1.5mm, and the length in the first gap 4 and the 3rd gap 6 is 56mm, and the length in the second gap 5 is 57mm, and the partial-length of the second gap 5 wide middle is 30mm, and the concrete size of remainder is as Fig. 2.In reality is implemented, can proper extension or foreshorten to radio frequency feed-in part in circuit, also can perforate on system floor, with the coaxial line direct feed of 50 ohm, the inner wire of coaxial line is connected with exciting unit, and outer conductor is connected with system floor.
In the present embodiment, first, second ground connection minor matters are rectangle, width is w1=2.5mm, length is l=16.5mm, first, second monopole is rectangle, width w2=2.5mm, length is l=16.5mm, ground connection minor matters and floor connecting line are that inverted L shape width is respectively w3=0.5mm and w4=1.2mm, length is respectively ld1=3.5mm and ld2=6mm, the distance h1=5mm on the 3rd gap 6 and medium substrate plate top, the distance h2=6mm on connecting line and dielectric-slab top, the distance h3=9mm on the first gap 4 and medium substrate top, the width sw1=0.3mm of connecting line, the width sw2=0.3mm in the second two ends, gap 5 and width sw4=1mm of centre, the width sw3=0.3mm in the first gap 4, distance sw5=0.7mm between first gap 4 and the second gap 5, article two, the distance LW=50mm between feeder line.
The return loss of the mimo antenna emulation made according to above-mentioned illustrated dimension and isolation result are respectively as Fig. 3 and Fig. 4.As seen from the figure, this mimo antenna is in 1710-2690MHz, and return loss is less than-10dB, and isolation is less than-15dB, covers GSM1800, GSM1900, UMTS2100, LTE2300, LTE2500 and 2.4GHz WLAN six working frequency range.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (6)
1. one kind utilizes the mimo antenna of three gap decoupling zeros, comprise medium substrate, it is characterized in that, the printing of described medium substrate front is about first of medium substrate center line symmetry, second monopole and the first microstrip line about medium substrate center line symmetry, second microstrip line, described first, second monopole is respectively with first, second microstrip line connects, be printed on the medium substrate back side about first of medium substrate center line symmetry, second ground connection minor matters, described first, second microstrip line is connected by connecting line, also print system floor, the described medium substrate back side, described system floor embeds three gaps.
2. antenna according to claim 1, is characterized in that, described first monopole and the first ground connection minor matters form the first coupled structure, and described second monopole and the second ground connection minor matters form the second coupled structure.
3. antenna according to claim 1, is characterized in that, three gaps crossed over by described first microstrip line and the second microstrip line, and described first microstrip line, the second microstrip line and connecting line and three articles of gaps form the 3rd coupled structure.
4. antenna according to claim 1, is characterized in that, the characteristic impedance of described first microstrip line and the second microstrip line is 50 ohm.
5. antenna according to claim 1, is characterized in that, described three gaps comprise first, second and third gap, and the width in the middle part of described second gap is greater than the width at the second two ends, gap.
6. antenna according to claim 1, is characterized in that, described first monopole and described first ground connection minor matters form the first antenna element, and described second monopole and described second ground connection minor matters form the second antenna element.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510102787.7A CN104733856A (en) | 2015-03-09 | 2015-03-09 | MIMO antenna decoupled through three gaps |
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| CN201510102787.7A CN104733856A (en) | 2015-03-09 | 2015-03-09 | MIMO antenna decoupled through three gaps |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406184A (en) * | 2015-12-04 | 2016-03-16 | 华南理工大学 | Novel ultra-wide band MIMO (Multiple Input Multiple Output) antenna |
| CN105406183A (en) * | 2015-12-04 | 2016-03-16 | 华南理工大学 | Triple-band MIMO (Multiple Input Multiple Output) antenna used for WLAN (Wireless Local Area Network) and WIMAX (World Interoperability for Microwave Access) |
| CN106450674A (en) * | 2016-08-24 | 2017-02-22 | 重庆大学 | Antenna array, communication device and terminal equipment |
| CN115207607A (en) * | 2022-07-11 | 2022-10-18 | 南阳师范学院 | Low-coupling broadband radial line slot antenna |
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| DE59913804D1 (en) * | 1998-04-03 | 2006-10-12 | Marconi Comm Gmbh | Dual polarized antenna element |
| CN101359770A (en) * | 2008-09-19 | 2009-02-04 | 清华大学 | Wide band double antenna system for mobile terminals |
| CN202855894U (en) * | 2012-09-18 | 2013-04-03 | 桂林电子科技大学 | High isolation double unit MIMO array antenna |
| CN204441476U (en) * | 2015-03-09 | 2015-07-01 | 华南理工大学 | A kind of mimo antenna utilizing three gap decoupling zeros |
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2015
- 2015-03-09 CN CN201510102787.7A patent/CN104733856A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE59913804D1 (en) * | 1998-04-03 | 2006-10-12 | Marconi Comm Gmbh | Dual polarized antenna element |
| CN101359770A (en) * | 2008-09-19 | 2009-02-04 | 清华大学 | Wide band double antenna system for mobile terminals |
| CN202855894U (en) * | 2012-09-18 | 2013-04-03 | 桂林电子科技大学 | High isolation double unit MIMO array antenna |
| CN204441476U (en) * | 2015-03-09 | 2015-07-01 | 华南理工大学 | A kind of mimo antenna utilizing three gap decoupling zeros |
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| Title |
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| YAN WANG AND ZHENGWEI DU: ""A Wideband Printed Dual-Antenna With Three Neutralization Lines for Mobile Terminals"", 《IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION》 * |
| 夏星星: ""移动终端宽带MIMO天线研究"", 《中国优秀硕士论文全文数据库 信息科技辑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406184A (en) * | 2015-12-04 | 2016-03-16 | 华南理工大学 | Novel ultra-wide band MIMO (Multiple Input Multiple Output) antenna |
| CN105406183A (en) * | 2015-12-04 | 2016-03-16 | 华南理工大学 | Triple-band MIMO (Multiple Input Multiple Output) antenna used for WLAN (Wireless Local Area Network) and WIMAX (World Interoperability for Microwave Access) |
| CN106450674A (en) * | 2016-08-24 | 2017-02-22 | 重庆大学 | Antenna array, communication device and terminal equipment |
| CN115207607A (en) * | 2022-07-11 | 2022-10-18 | 南阳师范学院 | Low-coupling broadband radial line slot antenna |
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Application publication date: 20150624 |