CN105680177A - T-shaped structure feeding double-frequency and dual-unit planar microstrip MIMO antenna applied to WLAN - Google Patents
T-shaped structure feeding double-frequency and dual-unit planar microstrip MIMO antenna applied to WLAN Download PDFInfo
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- CN105680177A CN105680177A CN201610044314.0A CN201610044314A CN105680177A CN 105680177 A CN105680177 A CN 105680177A CN 201610044314 A CN201610044314 A CN 201610044314A CN 105680177 A CN105680177 A CN 105680177A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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Abstract
The invention provides a T-shaped structure feeding double-frequency and dual-unit planar microstrip MIMO antenna applied to a WLAN, and relates to the field of antennas in passive devices. The designed antenna comprises two antenna units, a dielectric substrate and a ground plate, wherein a square gap is formed in a radiation patch of the antenna units; four rectangular columns are vertically located at four vertex angles of the square gap; a square patch is placed on the top surface of each of the four rectangular columns; the two antenna units are printed on the dielectric substrate; and the ground plate is attached to the lower part of the dielectric substrate. According to the MIMO antenna provided by the invention, the electric size of the antenna is greatly reduced; the occupied space can be greatly reduced; the antenna is low in profile and easy to process; the isolation degree of the antenna is greatly improved; the designed antenna has dual-frequency working characteristic and has stable polarization diversity characteristic; and an FR4 material is adopted by the dielectric substrate, and is low in price and easy to purchase.
Description
Technical field
The present invention relates to field of antenna in passive device, especially a kind of planar microstrip mimo antenna.
Background technology
Along with developing rapidly of wireless communication technology, people are more and more stronger to the dependency of wireless terminal, and traditional technology cannot meet the requirement of transfer speed and quality. In the environment of multipath, multiple-input and multiple-output (Multiple-InputMultiple-Output, MIMO) technology can under the prerequisite not increasing bandwidth of operation and transmitted power, improve communication quality and the capacity of wireless channel, and it is listed in one of core technology of LTE (LongTermEvolution).
Mimo antenna has been made a lot of research by Chinese scholars, such as: the people such as Y.Gao devise a mid-frequency and are operated in 5.2GHz, are applied to WLAN, there are the two unit mimo antenna systems on minimum floor, through revising, the degree of coupling between two antennas is dropped to below-28dB; The people such as ShuaiZhang propose a kind of uncoupling technology for PIFA antenna, utilize a kind of T-shaped gap impedance umformer, it is possible to the degree of coupling between the mimo antenna work single-frequency and two frequency is reduced effectively. But above antenna all has the bigger shortcoming of antenna volume, is unfavorable for the demand of current device miniaturization, and in addition, the isolation of antenna unit is also relatively low, interference is relatively big, and do not polarize diversity characteristic simultaneously. Therefore the direction that the high-isolation mimo antenna of the miniaturization with diversity characteristic has just become us to study how is designed.
Summary of the invention
In order to overcome the deficiencies in the prior art, this patent is intended to design the high-isolation mimo antenna being applicable to mobile phone terminal with polarization orthogonal diversity characteristic, has following characteristic: electricity size is little, isolation height, has polarization diversity function and is convenient to integrated processing.
The technical solution adopted for the present invention to solve the technical problems is:
Mimo antenna designed by the present invention is made up of four parts: No. 1 antenna unit, No. 2 antenna unit, medium substrate (3) and ground plate (4).
No. 1 antenna unit and No. 2 antenna unit are L by a T font 50 ohm of port feed coupling lines and the length of sidepatchSquare radiation patch 1c form, LpatchSpan be 24.5mm～26.5mm, No. 1 antenna unit linear dimension that is coupled with 50 ohm of port feeds of No. 2 antenna unit is completely identical, No. 1 antenna unit and No. 2 antenna units shareds square radiation patch (1c), choose any two adjacent edges of square radiation patch 1c, be coupled lines and selected two limits parallel placements respectively by No. 1 antenna unit and T font 50 ohm of port feeds of No. 2 antenna unit, distance between the T font of No. 1 antenna unit and No. 2 antenna unit 50 ohm of port feed coupling lines and radiation patch 1c is g, the span 0.08mm of g～1.0mm, namely No. 1 antenna unit is parallel in square radiation patch (1c) two limits chosen and mutually vertical respectively with two port feeds coupling lines of No. 2 antenna unit, opening a length of side at square radiation patch (1c) center position is LslotSquare notch, LslotSpan be 9.5mm～10.5mm, be perpendicular at four drift angle places of square notch antenna surface direction erect respectively four sizes identical rectangular parallelepiped post 1d～4d, the bottom surface of rectangular parallelepiped post 1d～4d is the length of side is the square of w=1mm, the height of rectangular parallelepiped post 1d～4d is h=5mm, the coincidence all corresponding to the summit of square notch of the summit of rectangular parallelepiped post 1d～4d bottom surface, it is L that the end face at four rectangular parallelepiped post 1d～4d places a length of sideupSquare patch (1e), LupSpan be 11.5mm～12.5mm, the summit of the summit of rectangular parallelepiped post 1d～4d end face and two adjacent sides and square patch 1e and two all corresponding coincidences of adjacent side.
No. 1 antenna unit and No. 2 antenna unit are printed on square medium substrate (3), and square medium substrate (3) adopts relative permittivity to be 4.4, and loss tangent is 0.02, and thickness is hsubPolytetrafluoroethylmaterial material, hsubSpan be 1.5mm～1.7mm.
Ground plate (4) is attached to the underface of square medium substrate (3), and size is identical with the size of square medium substrate (3).
The invention has the beneficial effects as follows the mimo antenna of design, it is orthogonal that two antenna unit have T-shaped feed coupling line port, and the feature that radiation patch shares, makes antenna electric size greatly reduce, in the application of the mobile terminals such as mobile phone, little size can greatly subtract small occupied space; Couple feed line and and radiating element all adopt microstrip line, make antenna section lower, and be easy to processing; Dig square notch at radiation patch center and above radiation patch, cover paster, greatly increase antenna isolation, maximum can reach-31.52dB; The antenna of design has two performance characteristics frequently, has stable polarization diversity characteristic, and when two antenna units shared radiation patch, two antenna unit have the characteristic of linear polarization orthogonal set; Medium substrate employing specific inductivity is the FR4 material of 4.4, cheap, is easy to buy. In a word, cost of manufacture of the present invention is low, is easy to processing, can be mass, have bigger actual application value.
Accompanying drawing explanation
Fig. 1 is the structural representation of this antenna, and wherein Fig. 1 (a) is the vertical view of mimo antenna, and Fig. 1 (b) is the front view of mimo antenna.
Fig. 2 is the emulation S parameter of antenna, and wherein Fig. 2 (a) is the S parameter of mimo antenna at 2.4GHz, and Fig. 2 (b) is the S parameter of mimo antenna at 5.9GHz.
Fig. 3 is the radiation pattern characteristic of antenna, Fig. 3 (a) is the xoz direction radiation pattern of mimo antenna at 2.4GHz, Fig. 3 (b) is the yoz direction radiation pattern of mimo antenna at 2.4GHz, Fig. 3 (c) is the xoz direction radiation pattern of mimo antenna at 5.9GHz, and Fig. 3 (d) is the yoz direction radiation pattern of mimo antenna at 5.9GHz.
In figure: the T-shaped feed coupling line feed part of 1a-1 antenna unit, the T-shaped feed coupling line coupling part of 1b-1 antenna unit, 1c-two antenna unit square radiation patch, the pillar of 1d～4d-gap upper square paster, square patch above 1e-square radiation patch gap, the T-shaped feed coupling line feed part of 2a-2 antenna unit, the T-shaped feed coupling line coupling part of 2b-2 antenna unit, 3-PTFE medium substrate, 4-floor, Port1-feed port 1, Port2-feed port 2.
LfeedThe T-shaped feed coupling line coupling partial-length of-No. 1 antenna unit and No. 2 antenna unit, WfeedThe T-shaped feed coupling line coupling part width of-No. 1 antenna unit and No. 2 antenna unit, LportThe T-shaped feed coupling line port feed partial-length of-No. 1 antenna unit and No. 2 antenna unit, WportThe T-shaped feed coupling line port feed part width of-No. 1 antenna unit and No. 2 antenna unit, LpatchThe length of side of the square radiation patch 1c of-No. 1 antenna unit and No. 2 antenna units shareds, LslotThe length of side in the square gap that-square radiation patch is opened, LupThe length of side of the square gap upper square paster that-square radiation patch is opened, the bottom surface length of side of rectangular parallelepiped post outside w-square radiation patch gap, the height of rectangular parallelepiped post outside h-square radiation patch gap, distance between the T-shaped feed coupling line of g-1 antenna unit and No. 2 antenna unit and radiation patch, LsubThe length of-square medium substrate, hsubThe height of-square medium substrate, x, y, z-coordinate axis.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Mimo antenna designed by the present invention is made up of four parts: No. 1 antenna unit, No. 2 antenna unit, medium substrate (3) and ground plate (4).
No. 1 antenna unit and No. 2 antenna unit are L by a T font 50 ohm of port feed coupling lines and the length of sidepatchSquare radiation patch (1c) composition, LpatchSpan be 24.5mm～26.5mm, No. 1 antenna unit linear dimension that is coupled with 50 ohm of port feeds of No. 2 antenna unit is completely identical, No. 1 antenna unit and No. 2 antenna units shareds square radiation patch (1c), choose any two adjacent edges of square radiation patch (1c), be coupled lines and selected two limits parallel placements respectively by No. 1 antenna unit and T font 50 ohm of port feeds of No. 2 antenna unit, distance between the T font of No. 1 antenna unit and No. 2 antenna unit 50 ohm of port feed coupling lines and radiation patch (1c) is g, the span 0.08mm of g～1.0mm, namely No. 1 antenna unit is parallel in square radiation patch (1c) two limits chosen and mutually vertical respectively with two port feeds coupling lines of No. 2 antenna unit, opening a length of side at square radiation patch (1c) center position is LslotSquare notch, LslotSpan be 9.5mm～10.5mm, be perpendicular at four drift angle places of square notch antenna surface direction erect respectively four sizes identical rectangular parallelepiped post 1d～4d, the bottom surface of rectangular parallelepiped post 1d～4d is the length of side is the square of w=1mm, the height of rectangular parallelepiped post 1d～4d is h=5mm, the coincidence all corresponding to the summit of square notch of the summit of rectangular parallelepiped post 1d～4d bottom surface, it is L that the end face at four rectangular parallelepiped post 1d～4d places a length of sideupSquare patch (1e), LupSpan be 11.5mm～12.5mm, the summit of the summit of rectangular parallelepiped post 1d～4d end face and two adjacent sides and square patch (1e) is all corresponding with two adjacent sides to be overlapped;
No. 1 antenna unit and No. 2 antenna unit are printed on square medium substrate (3), and square medium substrate (3) adopts relative permittivity to be 4.4, and loss tangent is 0.02, and thickness is hsubPolytetrafluoroethylmaterial material, hsubSpan be 1.5mm～1.7mm;
Ground plate (4) is attached to the underface of square medium substrate (3), and size is identical with the size of square medium substrate (3).
As shown in Figure 1, concrete dimensional parameters is as shown in table 1 for mimo antenna designed by the present invention, and the letter in table 1 represents the corresponding geometrical dimension parameter in Fig. 1 (a) and Fig. 2 (b), and unit is mm, all has corresponding sign in FIG.
Table 1
| Variable | Numerical value | Variable | Numerical value |
| Lsub | 46.62±2.00 | hsub | 1.80±0.08 |
| Lfeed | 25.00±1.00 | Wfeed | 0.80±0.02 |
| Lpatch | 25.50±1.00 | Wport | 1.00±0.05 |
| Lport | 10.00±0.50 | Lslot | 10.00±0.50 |
| Lup | 12.00±0.50 | w | 1.00±0.01 |
| h | 5.00±0.20 | g | 0.09±0.01 |
In figure, the T-shaped feed coupling line feed part of 1a-1 antenna unit, the T-shaped feed coupling line coupling part of 1b-1 antenna unit, 1c-two antenna unit square radiation patch, the pillar of 1d～4d-gap upper square paster, square patch above 1e-square radiation patch gap, the T-shaped feed coupling line feed part of 2a-2 antenna unit, the T-shaped feed coupling line coupling part of 2b-2 antenna unit, 3-PTFE medium substrate, 4-floor, Port1-feed port 1, Port2-feed port 2.
LfeedThe T-shaped feed coupling line coupling partial-length of-No. 1 antenna unit and No. 2 antenna unit, WfeedThe T-shaped feed coupling line coupling part width of-No. 1 antenna unit and No. 2 antenna unit, LportThe T-shaped feed coupling line port feed partial-length of-No. 1 antenna unit and No. 2 antenna unit, WportThe T-shaped feed coupling line port feed part width of-No. 1 antenna unit and No. 2 antenna unit, LpatchThe length of side of the square radiation patch 1c of-No. 1 antenna unit and No. 2 antenna units shareds, LslotThe length of side in the square gap that-square radiation patch is opened, LupThe length of side of the square gap upper square paster that-square radiation patch is opened, the bottom surface length of side of rectangular parallelepiped post outside w-square radiation patch gap, the height of rectangular parallelepiped post outside h-square radiation patch gap, distance between the T-shaped feed coupling line of g-1 antenna unit and No. 2 antenna unit and radiation patch, LsubThe length of-square medium substrate, hsubThe height of-square medium substrate, x, y, z-coordinate axis.
No. 1 antenna unit is made up of 50 ohm of port feeds coupling line (being 1a, 1b shown in Fig. 1 (a)) and radiation patch (being 1c shown in Fig. 1 (a)). 1a is 50 ohm of T-shaped feed coupling line feed parts of No. 1 antenna unit, and 1b is the T-shaped feed coupling line coupling part of No. 1 antenna unit, and 1a, 1b vertically place and constitute T-shaped feeder line. 1c is the length of side of No. 1 antenna unit is LpatchSquare radiation patch, LpatchSpan be 24mm～26mm, choose arbitrarily a limit of square radiation patch, by the 50 of No. 1 antenna unit ohm of port feed coupling line placements parallel with the limit of selected square radiation patch, opening a length of side at distance square radiation patch 1c center position place is LupSquare notch, above the square notch being perpendicular to square radiation patch direction, to cover the length of side be LupSquare patch 1e, support by four rectangular parallelepiped post 1d～4d, energy by 1b be coupled to radiation patch 1c part radiate.
No. 2 antenna unit are also (be 2a shown in Fig. 1 (a) by 50 ohm of port feeds coupling lines, 2b) with radiation patch (being 1c shown in Fig. 1 (a)) composition, 2a is 50 ohm of T-shaped feed coupling line feed parts of No. 2 antenna unit, 2b is the T-shaped feed coupling line coupling part of No. 2 antenna unit, 2a, 2b vertically place and constitute T-shaped feeder line. Two the same radiation patch of antenna units shareds (1c), can greatly reduce antenna size, realize the object of miniaturization, in addition, choose the limit that square radiation patch is adjacent with 50 ohm of port feed coupling lines of No. 1 antenna unit, by the 50 of No. 2 antenna unit ohm of port feed coupling line placements parallel with selected limit. The port feed coupling line of such two antenna unit is also mutually vertical, thus makes antenna have orthogonal set characteristic. The square gap dug in radiation patch (1c) above also covers square patch and has the effect improving two antenna cell isolation degree in top, enables antenna in 2.4GHz and 5.9GHz two band operation simultaneously.
No. 1 antenna unit and No. 2 antenna unit, being printed on size is Lsub×Lsub, relative permittivity is 4.4, and thickness is hsub, loss tangent is on the PTFE medium substrate (3) of 0.02, LsubSpan be 44.62mm～48.62mm. Material behavior is better, is convenient to processing, and production cost is lower.
Medium substrate (3) lower surface is connected with ground plate (4).
With electromagnetism simulation software HFSS, antenna model is carried out simulation optimization, determine dimensional parameters, obtain the return loss plot of antenna, in accompanying drawing, Fig. 2 (a) is for antenna is in the emulation return loss plot of 2.4GHz, Fig. 2 (b) is for antenna is in the emulation return loss plot of 5.9GHz, Fig. 3 (a) is for mimo antenna is at the xoz direction radiation pattern of 2.4GHz, Fig. 3 (b) is for mimo antenna is at the yoz direction radiation pattern of 2.4GHz, Fig. 3 (c) is for mimo antenna is at the xoz direction radiation pattern of 5.9GHz, Fig. 3 (d) is for mimo antenna is at the yoz direction radiation pattern of 5.9GHz. it may be seen that the mimo antenna of inventive design has the characteristic of polarization diversity and high-isolation, and this antenna has the characteristic of double frequency-band. thus verify the exploitativeness of the present invention.
Claims (1)
1. the two two unit planar microstrip mimo antenna being frequently applied to WLAN of T-type structure feed, comprise No. 1 antenna unit, No. 2 antenna unit, medium substrate (3) and ground plate (4), it is characterised in that:
No. 1 antenna unit and No. 2 antenna unit are L by a T font 50 ohm of port feed coupling lines and the length of sidepatchSquare radiation patch (1c) composition, LpatchSpan be 24.5mm～26.5mm, No. 1 antenna unit linear dimension that is coupled with 50 ohm of port feeds of No. 2 antenna unit is completely identical, No. 1 antenna unit and No. 2 antenna units shareds square radiation patch (1c), choose any two adjacent edges of square radiation patch (1c), be coupled lines and selected two limits parallel placements respectively by No. 1 antenna unit and T font 50 ohm of port feeds of No. 2 antenna unit, distance between the T font of No. 1 antenna unit and No. 2 antenna unit 50 ohm of port feed coupling lines and radiation patch (1c) is g, the span 0.08mm of g～1.0mm, namely No. 1 antenna unit is parallel in square radiation patch (1c) two limits chosen and mutually vertical respectively with two port feeds coupling lines of No. 2 antenna unit, opening a length of side at square radiation patch (1c) center position is LslotSquare notch, LslotSpan be 9.5mm～10.5mm, be perpendicular at four drift angle places of square notch antenna surface direction erect respectively four sizes identical rectangular parallelepiped post 1d～4d, the bottom surface of rectangular parallelepiped post 1d～4d is the length of side is the square of w=1mm, the height of rectangular parallelepiped post 1d～4d is h=5mm, the coincidence all corresponding to the summit of square notch of the summit of rectangular parallelepiped post 1d～4d bottom surface, it is L that the end face at four rectangular parallelepiped post 1d～4d places a length of sideupSquare patch (1e), LupSpan be 11.5mm～12.5mm, the summit of the summit of rectangular parallelepiped post 1d～4d end face and two adjacent sides and square patch (1e) is all corresponding with two adjacent sides to be overlapped;
No. 1 antenna unit and No. 2 antenna unit are printed on square medium substrate (3), and square medium substrate (3) adopts relative permittivity to be 4.4, and loss tangent is 0.02, and thickness is hsubPolytetrafluoroethylmaterial material, hsubSpan be 1.5mm～1.7mm;
Ground plate (4) is attached to the underface of square medium substrate (3), and size is identical with the size of square medium substrate (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610044314.0A CN105680177B (en) | 2016-01-22 | 2016-01-22 | T-type structure feed double frequency is applied to WLAN two unit planar microstrip mimo antennas |
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| CN201610044314.0A CN105680177B (en) | 2016-01-22 | 2016-01-22 | T-type structure feed double frequency is applied to WLAN two unit planar microstrip mimo antennas |
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| CN105680177B CN105680177B (en) | 2018-04-06 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602234A (en) * | 2016-12-09 | 2017-04-26 | 厦门大学 | Dual-port MIMO coplanar waveguide antenna with left hand feed coupling control |
| WO2018133516A1 (en) * | 2017-01-17 | 2018-07-26 | 中兴通讯股份有限公司 | Mimo antenna and terminal |
| CN108598695A (en) * | 2018-04-19 | 2018-09-28 | 重庆邮电大学 | A kind of millimeter wave micro-base station antenna that grounding probe is combined with differential feed |
| CN112201951A (en) * | 2020-09-28 | 2021-01-08 | 上海摩勤智能技术有限公司 | Multi-antenna layout structure of antenna bracket and mobile terminal |
| CN112713404A (en) * | 2021-03-25 | 2021-04-27 | 网络通信与安全紫金山实验室 | Single-layer broadband microstrip patch antenna |
| CN113964505A (en) * | 2021-09-09 | 2022-01-21 | 华南理工大学 | Coupling feed patch antenna and communication system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602234A (en) * | 2016-12-09 | 2017-04-26 | 厦门大学 | Dual-port MIMO coplanar waveguide antenna with left hand feed coupling control |
| CN106602234B (en) * | 2016-12-09 | 2019-08-13 | 厦门大学 | The dual-port MIMO coplanar waveguide antenna of coupling control is fed with left hand |
| WO2018133516A1 (en) * | 2017-01-17 | 2018-07-26 | 中兴通讯股份有限公司 | Mimo antenna and terminal |
| CN108598695A (en) * | 2018-04-19 | 2018-09-28 | 重庆邮电大学 | A kind of millimeter wave micro-base station antenna that grounding probe is combined with differential feed |
| CN112201951A (en) * | 2020-09-28 | 2021-01-08 | 上海摩勤智能技术有限公司 | Multi-antenna layout structure of antenna bracket and mobile terminal |
| CN112201951B (en) * | 2020-09-28 | 2023-03-10 | 上海摩勤智能技术有限公司 | Multi-antenna layout structure of antenna bracket and mobile terminal |
| CN112713404A (en) * | 2021-03-25 | 2021-04-27 | 网络通信与安全紫金山实验室 | Single-layer broadband microstrip patch antenna |
| CN112713404B (en) * | 2021-03-25 | 2021-07-06 | 网络通信与安全紫金山实验室 | Single-layer broadband microstrip patch antenna |
| CN113964505A (en) * | 2021-09-09 | 2022-01-21 | 华南理工大学 | Coupling feed patch antenna and communication system |
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