CN210468129U - Dual-band MIMO antenna - Google Patents
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- CN210468129U CN210468129U CN201922003898.9U CN201922003898U CN210468129U CN 210468129 U CN210468129 U CN 210468129U CN 201922003898 U CN201922003898 U CN 201922003898U CN 210468129 U CN210468129 U CN 210468129U
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Abstract
The utility model discloses a dual-band MIMO antenna, which comprises a dielectric substrate, wherein two sides of the dielectric substrate are respectively provided with an antenna module; the two antenna modules are in mirror symmetry about the middle lines of the two antenna modules; each antenna module comprises at least one antenna module, and each antenna module comprises two antenna units; the two antenna units are mirror symmetric about the midline of the two antenna units; a first neutralization line is connected between the feed points of the two antenna units, and the first neutralization line is in mirror symmetry with the center line of the first neutralization line; a second neutralization line is connected between the feed points of the two antenna units, and the second neutralization line is in mirror symmetry with the center line of the second neutralization line; the length of the first neutralization line is greater than the length of the second neutralization line. The dual-band MIMO antenna has the advantages of miniaturization, dual-band operation and high isolation between two adjacent antenna units, and has a wide application prospect in the 5G field.
Description
Technical Field
The utility model relates to an antenna field especially relates to a dual band MIMO antenna.
Background
In the prior art, there are mainly the following decoupling schemes for MIMO (multiple-in multiple-out) antennas of smart terminals such as mobile phones: the decoupling method comprises the steps of polarization decoupling, introduction of an EBG (Electromagnetic Band Gap) structure, floor slotting, addition of decoupling branches on a floor and the like, and the decoupling methods have the defects that the decoupling structure is too large in size, too complex in structure, only capable of decoupling a single frequency point and the like. Chinese patent with patent application number 201410259148.7 entitled "multiband MIMO antenna for smart machine" discloses achieving decoupling in the first parasitic element and second parasitic element connection and the neutral line. However, the patent can only decouple a narrow frequency band, and cannot meet the requirement of dual-frequency band decoupling.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a dual-band MIMO antenna realizes the dual-frenquency decoupling zero.
To achieve the purpose, the utility model adopts the following technical proposal:
a dual-band MIMO antenna comprises a dielectric substrate, wherein antenna modules are respectively arranged on two sides of the dielectric substrate; the two antenna modules are in mirror symmetry about the middle lines of the two antenna modules;
each antenna module comprises at least one antenna module, and each antenna module comprises two antenna units; the two antenna units are mirror symmetric about the midline of the two antenna units;
a first neutralization line is connected between the feed points of the two antenna units, and the first neutralization line is in mirror symmetry with the center line of the first neutralization line; a second neutralization line is connected between the feed points of the two antenna units, and the second neutralization line is in mirror symmetry with the center line of the second neutralization line; the length of the first neutralization line is greater than the length of the second neutralization line.
Optionally, the first plate surface of the dielectric substrate is connected with a ground plate; the antenna unit comprises a radiation slot arranged on the grounding plate, a coaxial inner core arranged in the medium substrate in a penetrating mode and a microstrip feeder arranged on the second plate surface of the medium substrate, and the microstrip feeder is connected with the radiation slot through the coaxial inner core.
Optionally, the two antenna modules are mirror-symmetric with respect to a first symmetric line, the dielectric substrate is a rectangular dielectric substrate, and the first symmetric line is a length-direction center line of the rectangular dielectric substrate.
Optionally, two antenna elements in the antenna module are mirror-symmetric with respect to a second line of symmetry, and the second line of symmetry is perpendicular to the first line of symmetry.
Optionally, the microstrip feed line is a T-shaped microstrip feed line, the T-shaped microstrip feed line includes a transverse feed line and a longitudinal feed line, and the longitudinal feed line is connected to the middle of the transverse feed line; two ends of the first neutralizing line are respectively connected with feed points on the longitudinal feeder lines of the two antenna units, and two ends of the second neutralizing line are respectively connected with feed points on the longitudinal feeder lines of the two antenna units.
Optionally, in the same antenna module, the radiation slots of the two antenna units are separated by the isolation portion of the ground plate; the middle part of the first neutralizing line protrudes towards the isolating part of the grounding plate to form a protruding part, and the width of the protruding part of the first neutralizing line is equal to that of the isolating part of the grounding plate.
Optionally, the second neutralizing line is in a "u" shape formed by three segments, and two ends of the second neutralizing line are respectively connected with two ends of the first neutralizing line correspondingly.
Optionally, the radiation gap includes a first rectangular gap, a second rectangular gap is connected to a middle portion of the first rectangular gap, and the second rectangular gap penetrates through the length of the ground plate to the side;
the first end of the first rectangular gap is connected with a first L-shaped gap, and the second end of the first rectangular gap is connected with a second L-shaped gap.
Optionally, the first L-shaped slit includes a first short-side slit and a first long-side slit that are communicated with each other, a first end of the first rectangular slit is connected to the first short-side slit, and the first long-side slit points to the second rectangular slit;
the second L-shaped gap comprises a second width-direction short edge and a second length-direction long edge, the second end of the first rectangular gap is connected with the second width-direction short edge, and the second length-direction long edge points to the second rectangular gap.
A terminal comprises the dual-band MIMO antenna, and the two antenna modules are respectively arranged on two opposite sides of the terminal.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model provides a dual-band MIMO antenna is presenting the neutral conductor that the point position introduced two different length and was the mirror symmetry structure and promoting the isolation of dual-frenquency, has solved current decoupling zero mode and can only lead to the poor problem of MIMO antenna system isolation to single-frequency point decoupling zero. Furthermore, the dual-band MIMO antenna introduces the neutral line at the feed point position, so that the decoupling effect can be effectively improved, the distance between the two neutral lines is short, and the increase of the size of the antenna can be avoided. In addition, the dual-band MIMO antenna has the advantages that the two antenna modules are respectively arranged on the two sides of the dielectric substrate, so that the antenna can be placed in long frames on the two sides of an intelligent terminal such as a mobile phone, and the miniaturization of the antenna is realized. In conclusion, the dual-band MIMO antenna has the advantages of miniaturization, dual-band operation and high isolation between two adjacent antenna units, and has a wide application prospect in the 5G field.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
The structure, ratio, size and the like shown in the drawings of the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention does not have the substantial significance in the technology, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy which can be produced by the present invention and the achievable purpose.
Fig. 1 is a schematic structural diagram of a dual-band MIMO antenna provided in an embodiment of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
fig. 3 is a schematic diagram of isolation between adjacent antenna units when the dual-band MIMO antenna provided by the embodiment of the present invention is not loaded with a neutral line;
fig. 4 is a schematic diagram of isolation between adjacent antenna units when the dual-band MIMO antenna provided by the embodiment of the present invention loads the first neutralization line and the second neutralization line;
fig. 5 is a schematic view of current distribution of the antenna unit at the resonant point of 3.5GHz when the dual-band MIMO antenna provided by the embodiment of the present invention loads the first neutralization line and the second neutralization line;
fig. 6 is a schematic diagram of the efficiency of the first antenna unit and the second antenna unit when the dual-band MIMO antenna is loaded with the first neutralization line and the second neutralization line.
Illustration of the drawings: 1. a ground plate; 11. an isolation section; 2. an antenna unit; 21. a radiation gap; 211. a first rectangular slit; 212. a second rectangular slit; 213. a first L-shaped slit; 214. a second L-shaped slot; 22. a microstrip feed line; 31. a first neutralization line; 32. a second neutralization line.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. It should be noted that when one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
The embodiment of the utility model provides a dual-band MIMO antenna reaches the dual-frenquency through two neutralization lines and treats the effect of high isolation.
Referring to fig. 1, the dual-band MIMO antenna includes a dielectric substrate, two antenna modules are respectively disposed on two sides of the dielectric substrate, and the two antenna modules are mirror-symmetric structures.
Each antenna module comprises at least one antenna module, each antenna module comprises two antenna units 2, and the two antenna units 2 are in mirror symmetry structures.
A first neutralization line 31 is connected between the feed points of the two antenna units 2, and the first neutralization line 31 is in a mirror symmetry structure. A second neutralization line 32 is further connected between the feed points of the two antenna units 2, and the second neutralization line 32 is in a mirror symmetry structure. The length of the first neutralization line 31 is greater than the length of the second neutralization line 32.
The utility model provides a dual-band MIMO antenna promotes the isolation of dual-frenquency at the neutralization line that presents point position and introduce two different length, has solved current decoupling zero mode and can only lead to the poor problem of MIMO antenna system isolation to single frequency point decoupling zero. Specifically, the first neutralization line 31 can achieve 3.4-3.6GHz bandwidth decoupling, the second neutralization line 32 can achieve 5.1-6.2GHz bandwidth decoupling, and the dual-band MIMO antenna can be used for a Sub-6 GHz communication frequency band of 5G.
Furthermore, the dual-band MIMO antenna introduces the neutral line at the feed point position, so that the decoupling effect can be effectively improved, the distance between the two neutral lines is short, and the increase of the size of the antenna can be avoided. Further, the utility model discloses all set up first neutralization line 31 and second neutralization line 32 into mirror symmetry structure, because two adjacent antenna element 2 are mirror symmetry structure, only neutralization line mirror symmetry, the electric current on the neutralization line could realize that the constant amplitude is reverse, plays the effect that the electric current offsets each other, reaches the decoupling zero effect.
Furthermore, the utility model discloses locate the both sides of medium base plate with two antenna module group branches, make the antenna place in intelligent terminal's such as cell-phones both sides long frame, utilize in the miniaturization that realizes the antenna.
In summary, the dual-band MIMO antenna has the advantages of miniaturization, dual-band operation and high isolation between two adjacent antenna units 2, and has a wide application prospect in the 5G field.
In this embodiment, each two-antenna module preferably includes two antenna modules, that is, the dual-band MIMO antenna includes eight antenna elements 2 in total, and is a dual-band eight-element MIMO antenna.
In this embodiment, the ground plate 1 is connected to the first plate surface of the dielectric substrate. The antenna unit 2 comprises a radiation slot 21 arranged on the ground plate 1, a coaxial inner core arranged in the medium substrate in a penetrating way and a microstrip feeder 22 arranged on the second plate surface of the medium substrate, and the microstrip feeder 22 is connected with the radiation slot 21 through the coaxial inner core.
The dual-band MIMO antenna can form a radiation unit only by slotting the ground plate 1 in a small range through microstrip-slot coupling feed, and does not need to cut the ground plate 1 in a large range, thereby being beneficial to realizing the miniaturization and broadband characteristics of the antenna.
Specifically, the two antenna modules are in mirror symmetry with respect to a first symmetry line, the dielectric substrate is a rectangular dielectric substrate, and the first symmetry line is a length-direction center line of the rectangular dielectric substrate. The two antenna elements 2 in the antenna module are mirror symmetric with respect to a second line of symmetry, which is perpendicular to the first line of symmetry.
The microstrip feed line 22 is a T-shaped microstrip feed line, which includes a transverse feed line and a longitudinal feed line, and the longitudinal feed line is connected to the middle of the transverse feed line. Both ends of the first neutralization line 31 are connected to feed points on the longitudinal feed lines of the two antenna elements 2, respectively, and both ends of the second neutralization line 32 are connected to feed points on the longitudinal feed lines of the two antenna elements 2, respectively.
In the present embodiment, in the same antenna module, the radiation slots 21 of the two antenna elements 2 are separated by the isolation portion 11 of the ground plate 1. The middle portion of the first neutralizing line 31 protrudes toward the isolation portion 11 of the ground plate 1 to form a protruding portion, and the width of the protruding portion of the first neutralizing line 31 is equal to the width of the isolation portion 11 of the ground plate 1. The first neutralization line 31 is a "convex" upper structure formed by five segments, which is the remaining structure of "convex" shape with the lower end removed "U".
The second neutralizing wire 32 is a "U" shape formed by three segments, and two ends of the second neutralizing wire 32 are respectively connected with two ends of the first neutralizing wire 31.
In the present embodiment, the radiation slot 21 includes a first rectangular slot 211, a second rectangular slot 212 is connected to a middle portion of the first rectangular slot 211, and the second rectangular slot 212 penetrates through the length of the ground plate 1 to the side.
A first L-shaped slot 213 is connected to a first end of the first rectangular slot 211, and a second L-shaped slot 214 is connected to a second end of the first rectangular slot 211.
The first L-shaped slit 213 comprises a first short slit and a first long slit which are communicated with each other, the first short slit is connected to the first end of the first rectangular slit 211, the first long slit points to the second rectangular slit 212, and the first long slit shrinks towards one end of the first short slit to form a neck.
The second L-shaped slot 214 comprises a second width-wise short side and a second length-wise long side, the second end of the first rectangular slot 211 being connected to the second width-wise short side and the second length-wise long side being directed towards the second rectangular slot 212.
The embodiment of the utility model provides a still provide a terminal including aforementioned dual band MIMO antenna, two relative long sides at terminal are located respectively to two antenna module groups.
The embodiment of the utility model provides an effect to the decoupling zero of first neutralization line 31 and second neutralization line 32 has carried out relevant test. The two antenna elements 2 in the upper left corner of fig. 1 are defined as a first antenna element and a second antenna element, and the two antenna elements 2 in the upper right corner of fig. 1 are defined as a third antenna element and a fourth antenna element.
Referring to fig. 3, fig. 3 shows the isolation between adjacent antenna units 2 when the dual-band MIMO antenna provided by the present invention is not loaded with the neutral line. In fig. 3, S2,1 denotes an isolation between the first antenna element and the second antenna element, S3,2 denotes an isolation between the second antenna element and the third antenna element, and S4,3 denotes an isolation between the third antenna element and the fourth antenna element. As can be seen from fig. 3, at the deepest point of resonance at low and high frequencies, the isolation between the antenna elements 2 is less than 8dB, indicating that there is a strong coupling effect between the antenna elements 2.
Referring to fig. 4, fig. 4 shows the isolation between the adjacent antenna units 2 when the dual-band MIMO antenna provided by the present invention is loaded on the first neutralization line 31 and the second neutralization line 32. Where S21 denotes an isolation between the first antenna element and the second antenna element, S32 denotes an isolation between the second antenna element and the third antenna element, and S43 denotes an isolation between the third antenna element and the fourth antenna element. As can be seen from fig. 4, after the first and second neutralization lines 31 and 32 are loaded, the isolation between the first and second antenna elements and between the third and fourth antenna elements, i.e., S21 and S43, is greater than 12dB for both low and high frequencies. And the isolation between the second antenna unit and the third antenna unit is larger than 12dB due to the larger distance.
Referring to fig. 5, fig. 5 shows the current distribution of the antenna unit 2 at the resonant point 3.5GHz when the dual-band MIMO antenna provided by the present invention is loaded on the first neutralization wire 31 and the second neutralization wire 32, as can be seen from fig. 5, when the first antenna unit is excited, the current of the first antenna unit coupled to the second antenna unit and the current of the first neutralization wire 31 coupled to the second antenna unit have a cancellation effect, so that the isolation between the first antenna unit and the second antenna unit is significantly improved. At high frequencies, the second neutralization line 32 acts similar to the first neutralization line 31 at low frequencies, i.e., the current coupled from the first antenna element port to the second antenna element port cancels out the current coupled to the second antenna element port through the second neutralization line 32, thereby improving isolation at high frequencies.
Referring to fig. 6, fig. 6 shows the efficiency of the first antenna unit and the second antenna unit when the dual-band MIMO antenna provided by the present invention loads the first neutralization line 31 and the second neutralization line 32. As can be seen from the figure, the efficiency of the first antenna element and the second antenna element in the operating frequency band is higher than 55%.
It can be proven through the test that the utility model provides a dual-band MIMO antenna has realized the high isolation of low frequency and high frequency through first neutralization line 31 and second neutralization line 32 to antenna element 2 does not reduce because of introducing the neutralization line in the efficiency of low frequency and high frequency.
The utility model provides a dual-band MIMO antenna, through introducing the neutralization line of two different length, can carry out the decoupling zero to low frequency and high frequency simultaneously. By adjusting the lengths of the two neutralization lines, the two resonance points can be flexibly moved to a required frequency band, namely, the decoupled frequency band can be designed according to requirements. The adoption neutralization line decoupling zero can avoid the destruction of butt joint floor 1, and the structure is comparatively simple, and the decoupling zero is effectual.
Furthermore, the dual-band MIMO antenna introduces the neutral line at the feed point position, so that the decoupling effect can be effectively improved, the distance between the two neutral lines is short, and the increase of the size of the antenna can be avoided.
Further, the dual-band MIMO antenna has the advantages that the two antenna modules are respectively arranged on two sides of the dielectric substrate, so that the antenna can be placed in long frames on two sides of an intelligent terminal such as a mobile phone, the antenna is specifically fed in a microstrip-slot coupling mode, a radiating unit can be formed only by slotting the ground plate 1 in a small range, the ground plate 1 does not need to be cut in a large range, and the dual-band MIMO antenna is used for realizing miniaturization and broadband characteristics of the antenna.
To sum up, the utility model provides a dual-band MIMO antenna has the advantage that the isolation is high between miniaturization, dual-band work and two adjacent antenna element 2, has extensive application prospect in the 5G field.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A dual-band MIMO antenna is characterized by comprising a dielectric substrate, wherein two sides of the dielectric substrate are respectively provided with an antenna module; the two antenna modules are in mirror symmetry about the middle lines of the two antenna modules;
each antenna module comprises at least one antenna module, and each antenna module comprises two antenna units; the two antenna units are mirror symmetric about the midline of the two antenna units;
a first neutralization line is connected between the feed points of the two antenna units, and the first neutralization line is in mirror symmetry with the center line of the first neutralization line; a second neutralization line is connected between the feed points of the two antenna units, and the second neutralization line is in mirror symmetry with the center line of the second neutralization line; the length of the first neutralization line is greater than the length of the second neutralization line.
2. The dual-band MIMO antenna of claim 1, wherein a ground plane is connected to the first plane of the dielectric substrate; the antenna unit comprises a radiation slot arranged on the grounding plate, a coaxial inner core arranged in the medium substrate in a penetrating mode and a microstrip feeder arranged on the second plate surface of the medium substrate, and the microstrip feeder is connected with the radiation slot through the coaxial inner core.
3. The dual-band MIMO antenna of claim 2, wherein the two antenna modules are mirror-symmetric with respect to a first line of symmetry, the dielectric substrate is a rectangular dielectric substrate, and the first line of symmetry is a longitudinal centerline of the rectangular dielectric substrate.
4. A dual band MIMO antenna according to claim 3, wherein two of said antenna elements in said antenna module are further mirror symmetric about a second line of symmetry, said second line of symmetry being perpendicular to said first line of symmetry.
5. The dual-band MIMO antenna of claim 2, wherein the microstrip feed line is a T-shaped microstrip feed line, the T-shaped microstrip feed line including a transversal feed line and a longitudinal feed line, the longitudinal feed line being connected to a middle portion of the transversal feed line; two ends of the first neutralizing line are respectively connected with feed points on the longitudinal feeder lines of the two antenna units, and two ends of the second neutralizing line are respectively connected with feed points on the longitudinal feeder lines of the two antenna units.
6. The dual-band MIMO antenna of claim 2, wherein the radiating slots of two antenna elements in the same antenna module are separated by an isolation portion of the ground plane; the middle part of the first neutralizing line protrudes towards the isolating part of the grounding plate to form a protruding part, and the width of the protruding part of the first neutralizing line is equal to that of the isolating part of the grounding plate.
7. The dual-band MIMO antenna of claim 2, wherein the second neutralizing line has a "u" shape with three segments, and two ends of the second neutralizing line are respectively connected to two ends of the first neutralizing line.
8. The dual-band MIMO antenna of claim 2, wherein the radiating slot comprises a first rectangular slot, a second rectangular slot is connected to a middle portion of the first rectangular slot, and the second rectangular slot penetrates a length of the ground plate to a lateral side;
the first end of the first rectangular gap is connected with a first L-shaped gap, and the second end of the first rectangular gap is connected with a second L-shaped gap.
9. The dual-band MIMO antenna of claim 8, wherein the first L-shaped slot comprises a first short-side slot and a first long-side slot that are connected to each other, a first end of the first rectangular slot is connected to the first short-side slot, and the first long-side slot is directed toward the second rectangular slot;
the second L-shaped gap comprises a second width-direction short edge and a second length-direction long edge, the second end of the first rectangular gap is connected with the second width-direction short edge, and the second length-direction long edge points to the second rectangular gap.
10. A terminal, comprising a dual-band MIMO antenna according to any of claims 1-9, wherein the two antenna modules are respectively disposed on two opposite sides of the terminal.
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| CN201922003898.9U CN210468129U (en) | 2019-11-19 | 2019-11-19 | Dual-band MIMO antenna |
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| CN201922003898.9U CN210468129U (en) | 2019-11-19 | 2019-11-19 | Dual-band MIMO antenna |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112635983A (en) * | 2020-12-11 | 2021-04-09 | 西安电子科技大学 | Dual-band eight-port MIMO terminal antenna based on radiator multiplexing technology |
| CN112688076A (en) * | 2020-12-22 | 2021-04-20 | 北京邮电大学 | Planar multi-port multi-band common-ground small-spacing high-isolation MIMO antenna |
| CN113346241A (en) * | 2021-06-23 | 2021-09-03 | 东莞市小精灵教育软件有限公司 | 5G dual-frenquency MIMO antenna structure and intelligent wearing equipment |
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2019
- 2019-11-19 CN CN201922003898.9U patent/CN210468129U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112635983A (en) * | 2020-12-11 | 2021-04-09 | 西安电子科技大学 | Dual-band eight-port MIMO terminal antenna based on radiator multiplexing technology |
| CN112635983B (en) * | 2020-12-11 | 2022-03-29 | 西安电子科技大学 | Dual-band eight-port MIMO terminal antenna based on radiator multiplexing technology |
| CN112688076A (en) * | 2020-12-22 | 2021-04-20 | 北京邮电大学 | Planar multi-port multi-band common-ground small-spacing high-isolation MIMO antenna |
| CN112688076B (en) * | 2020-12-22 | 2021-09-17 | 北京邮电大学 | Planar multi-port multi-band common-ground small-spacing high-isolation MIMO antenna |
| CN113346241A (en) * | 2021-06-23 | 2021-09-03 | 东莞市小精灵教育软件有限公司 | 5G dual-frenquency MIMO antenna structure and intelligent wearing equipment |
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