CN104882677B - Difference gap mimo antenna with high cmrr - Google Patents
Difference gap mimo antenna with high cmrr Download PDFInfo
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- CN104882677B CN104882677B CN201510270992.4A CN201510270992A CN104882677B CN 104882677 B CN104882677 B CN 104882677B CN 201510270992 A CN201510270992 A CN 201510270992A CN 104882677 B CN104882677 B CN 104882677B
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Abstract
The invention discloses a kind of difference gap mimo antenna with high cmrr, including medium substrate and multiple antenna elements, each antenna element includes floor and microstrip feed line, the floor is arranged on medium substrate top layer, and it is etched with T-shaped gap, the microstrip feed line is arranged on medium substrate bottom, and T-shaped gap is divided into open circuit gap and short-circuit gap；The floor of the multiple antenna element is connected, and medium substrate top layer is covered.The present invention can reach very high common mode inhibition effect using special differential feed structure and gap combination, with miniaturization, it is simple in construction, the advantages that high cmrr, two-band and high-isolation, it disclosure satisfy that miniaturization, low cost, easily with processing, it is easy to the requirement integrated with difference channel, can be widely applied to wlan system.
Description
Technical field
The present invention relates to a kind of mimo antenna, especially a kind of difference gap mimo antenna with high cmrr,
Belong to wireless mobile communications field.
Background technology
Recently as the fast development of wireless mobile communications, money of the wireless mobile communications so as to raising message transmission rate
Source --- frequency bandwidth and transmission power have all been on the verge of saturation.What the high speed development of mobile communication was brought is the day of frequency spectrum resource
Beneficial shortage, the transmission rate of information and quality how are improved on existing frequency spectrum resource has turned into the research weight of today's society
Point.MIMO (Mutltiple-Input Multiple-Output, multiple-input and multiple-output) wireless communication technologys are because it need not
The resource of frequency of loss bandwidth and transmission power is entered with regard to that can increase substantially the huge advantage of channel capacity and message transmission rate
The visual field of people is entered.Core technologies of the MIMO as 802.11n, because it can be before transmission bandwidth or transmission power not be increased
Put, considerably improve channel capacity and the reliability of transmission, it has also become the emphasis of domestic and foreign scholars research.Multi-antenna technology
As the core of MIMO technology, extensive concern has been similarly subjected to.
Mimo antenna design is the key technology of MIMO communication system.MIMO technology using multiple antennas launch/receive
Diversity, so as to obtain certain diversity gain；MIMO technology carries out spatial reuse using multiple antennas can then improve spectrum utilization
Rate, the transmission power can for not increasing system greatly improve transmission rate.The isolation of mimo antenna is one important
Research direction, the method for increasing isolation at present mainly have：EBG floor panel structures, Decoupling network, floor joint, reflector element, ground
Plate branch and Neutralization lines.
The fast development of wireless communication technology, also promote the needs of fully integrated radio frequency front-end product.Integrated RF front end
Generally use differential technique realizes that one of critical component as radio-frequency front-end, most of Antenna Designs are one port devices, no
Directly it can be integrated with difference channel, it usually needs differential signal is converted to using balun by single port signal and then feed antenna.
The use of balun can cause to be lost, and reduce system effectiveness, also increase the quantity of individual devices, be unfavorable for system altitude and integrate
And miniaturization.
Differential antennae changes the design method of traditional antenna, directly differential signal is fed into two ports of antenna,
Radio-frequency front-end to design highly integrated provides new approach.
It is as follows with understanding, presently disclosed prior art according to investigations：
1) Wen-Shan Chen, Chi-Huang Lin in 2011 and Hong-Twu Chen et al. are in Asia-Pacific
Entitled " A Compact Monopole Slot MIMO Antenna for have been delivered on Microwave Conference
In Wireless USB Dongle Application at WLAN Band " article, using microstrip line to gap monopole
Feed, has been designed to mimo antenna, has realized the work of WLAN 2.4GHz frequency ranges, and reached certain isolation again.My god
Linear dimension is smaller, but ground board size is larger, and simply realizes the work of mono- frequency range of WLAN.
2) in December, 2013 Reza Karimian, Homayoon Oraizi, Saeed Fakhte and Mohammad
Farahani et al. " is being delivered entitled on IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS "
“Novel F-Shaped Quad-Band Printed Slot Antennafor WLAN andWiMAXMIMO Systems”
Article, using microstrip line to the F shape cutler feeds on floor, plus the minor matters in F shapes gap, realize including WiMax and
The work of four frequency ranges including WLAN, and what four frequencies can be independent is controlled, and has done four units afterwards
Mutually orthogonal mimo antenna.The design of antenna employs open circuit gap structure and greatly reduces the size of antenna, but MIMO
High band bandwidth in four frequency bands of antenna is narrow, and the isolation between unit is nor very high.Compared with traditional single antenna,
The gain of mimo antenna increases.But compared with differential antennae, again not to the inhibitory action of common mode.
The content of the invention
The invention aims to solve the defects of above-mentioned prior art, there is provided a kind of with high cmrr
Difference gap mimo antenna, the mimo antenna is simple in construction, disclosure satisfy that miniaturization, low cost, easily with processing, is easy to and difference
The integrated requirement of circuit.
The purpose of the present invention can be reached by adopting the following technical scheme that：
Difference gap mimo antenna with high cmrr, including medium substrate and multiple antenna elements, it is described every
Individual antenna element includes floor and microstrip feed line, and the floor is arranged on medium substrate top layer, and is etched with T-shaped gap, described
Microstrip feed line is arranged on medium substrate bottom, and T-shaped gap is divided into open circuit gap and short-circuit gap；The multiple antenna element
Floor be connected, medium substrate top layer is covered.
As a kind of preferred scheme, the concave structure of microstrip feed line, the both ends of the concave structure are respectively the first feedback
Electric port and the second feed port, first feed port and the second feed port are located at the same edge of medium substrate bottom
Place.
As a kind of preferred scheme, rectangular aperture is etched with the connected floor, between the multiple antenna element
Separated by rectangular aperture.
As a kind of preferred scheme, the antenna element has four, the mutually orthogonal arrangement in T-shaped gap of four antenna elements
On connected floor；Four rectangular apertures are etched with the connected floor, pass through four between four antenna elements
Individual rectangular aperture separates.
As a kind of preferred scheme, the open circuit gap is used for the low-frequency resonant frequency for producing 2.4GHz, its current path
The a quarter of operation wavelength when length is 2.4GHz；The short-circuit gap is used for the high-frequency resonant frequency for producing 5.5GHz, its
The half of operation wavelength when current path length is 5.5GHz.
As a kind of preferred scheme, the medium substrate uses FR4 medium substrates, and its dielectric constant is 4.4, and thickness is
0.8mm。
As a kind of preferred scheme, the microstrip feed line uses 50 Ω microstrip feed lines.
The present invention has following beneficial effect relative to prior art：
1st, each antenna element of the invention is etched with T-shaped gap on floor, and using microstrip feed line to the T on floor
Shape gap carries out differential feed, and T-shaped gap is divided into open circuit gap and short-circuit gap by microstrip feed line, and it is humorous that open circuit gap forms low frequency
Shake pattern, short-circuit gap forms high-frequency resonant mode, and the use in gap of opening a way substantially reduces the size of antenna, two resonant modes
Formula covers WLAN tri- working frequency range of 2.4/5.2/5.8GHz；Can be only respectively by the length and width for adjusting T-shaped gap
Vertical adjustment resonant frequency and impedance bandwidth.
2nd, instant invention overcomes the common mode inhibition of traditional antenna, it is difficult to the problem of with the system integration, using special difference
Feed structure and gap combination can reach very high common mode inhibition effect, then rearrange four antenna elements are mutually orthogonal
Mimo antenna, etching rectangular aperture separates antenna element on floor, in the case where not influenceing antenna element S parameter, also
Add the isolation between antenna element.
3rd, instant invention overcomes covering, WLAN tri-band antennas are complicated, and size is big, it is difficult to the shortcomings that processing, have small
Type, simple in construction, high cmrr, the advantages that two-band and high-isolation, it can be widely applied to wlan system.
Brief description of the drawings
Fig. 1 is the antenna element top level structure schematic diagram of the present invention.
Fig. 2 is the antenna element fabric schematic diagram of the present invention.
Fig. 3 is the S parameter curve map that the antenna element of the present invention passes through Electromagnetic Simulation.
Fig. 4 is the mimo antenna top level structure schematic diagram of the present invention.
Fig. 5 is the mimo antenna fabric schematic diagram of the present invention.
Fig. 6 is the differential mode S parameter curve map that the mimo antenna of the present invention passes through Electromagnetic Simulation.
Fig. 7 is the common mode S parameter curve map that the mimo antenna of the present invention passes through Electromagnetic Simulation.
Wherein, 1- microstrip feed lines, 2- medium substrates, 3-T shapes gap, 4- first antenna units, the antenna elements of 5- second, 6-
Third antenna unit, the antenna elements of 7- the 4th, the rectangular apertures of 8- first, the rectangular apertures of 9- second, the rectangular apertures of 10- the 3rd, 11-
4th rectangular aperture, the feed ports of Port1- first, the feed ports of Port2- second.
Embodiment
Embodiment 1：
As depicted in figs. 1 and 2, the antenna element of the present embodiment includes floor and microstrip feed line 1, and the floor is arranged on Jie
The top layer of matter substrate 2, and T-shaped gap 3 is etched with, the microstrip feed line 1 is arranged on the bottom of medium substrate 2；
The 1 concave structure of microstrip feed line, the both ends of the concave structure are respectively the first feed port Port1 and second
Feed port Port2, the first feed port Port1 and the second feed port Port2 are located at the same of medium substrate bottom
Edge, from figure 2 it can be seen that unlike traditional differential feed, the first feed end of the present embodiment differential feed
Mouth Port1 and the second feed port Port2 is joined directly together, Port2 points of the first feed port Port1 and the second feed port
Other feed-in amplitude is identical, opposite in phase differential signal；
The T-shaped gap 3 can produce two resonant frequencies, and microstrip feed line 1 divides in T-shaped gap 3 for open circuit gap and short
Road gap, wherein open circuit gap is used for the low-frequency resonant frequency for producing 2.4GHz, its current path is L1, and L1 length is about
2.4GHzWherein λgRefer to operation wavelength during 2.4GHz；Short-circuit gap is used to produce 5.5GHz
High-frequency resonant frequency, its current path is L2+S2, and L2+S2 length is about 5.5GHz 1/2 λg, wherein λgRefer to
Operation wavelength during 5.5GHz；The centre frequency of two frequency ranges can be carried out independent by changing L1 and L2+S2 length
Adjustment, impedance bandwidth can also pass through the adjustment for width W1 and the W2 independence for changing T-shaped gap 3；Centre frequency is 2.4GHz's
Impedance bandwidth is 180M (2.35-2.56GHz), and centre frequency is that 5.5GHz impedance bandwidths are 800M (5.1-5.9GHz).Using
This differential feed structure can reach very high common mode inhibition, for difference mode signal, the feedbacks of the first feed port Port1 and second
Electric port Port2 signal phase is on the contrary, can be in the T-shaped gap 3 in edge c1, c2 generation electrical potential difference in T-shaped gap 3, floor
It will be encouraged by electrical potential difference, signal will be transferred on floor by strong electromagnetic coupled, so difference mode signal can radiate
Go out；For common-mode signal, the first feed port Port1 and the second feed port Port2 signal phase is identical, amplitude phase
Together, electrical potential difference will not be produced in edge c1, the c2 in T-shaped gap 3, such T-shaped gap 3 would not be energized, and common-mode signal can not
It is coupled on floor, so common-mode signal is reflected back completely, reaches the effect of common-mode signal suppression；The antenna of the present embodiment
Unit is by the S parameter curve of Electromagnetic Simulation as shown in figure 3, wherein S11ddRepresent the differential mode return loss of antenna element, S11cc
Represent the common mode return loss of antenna element.
Embodiment 2：
As shown in Figure 4 and Figure 5, the mimo antenna of the present embodiment includes four antenna element (antenna lists of above-described embodiment 1
Member) and medium substrate 2, wherein medium substrate 2 is using FR4 medium substrates, and its dielectric constant is 4.4, thickness 0.8mm；Four
Antenna element is respectively first antenna unit 4, the second antenna element 5, the antenna element 7 of third antenna unit 6 and the 4th, shares eight
Individual feed port, the floor of four antenna elements are connected, and are printed on FR4 medium substrate top layers；The micro-strip of four antenna elements
Feeder line 1 uses 50 Ω microstrip feed lines, and is printed on FR4 medium substrate bottoms, using feed port to the T-shaped gap 3 on floor
Carry out differential feed；The T-shaped gap 3 of four antenna elements is mutually orthogonal to be arranged on connected floor, on connected floor also
It is etched with four rectangular apertures, respectively the first rectangular aperture 8, the second rectangular aperture 9, the 3rd rectangular aperture 10 and the 4th rectangle
Gap 11, separated by four rectangular apertures between four antenna elements, do not influenceing the situation of antenna element S parameter
Under, it also add the isolation (being above 15dB in all frequency bands) between antenna element.As can be seen here, with just in the present embodiment
Hand over arrangement and rectangular aperture cut-off to increase isolation, hardly influence bandwidth of operation, realize high-isolation, structure letter
It is single, miniaturization, the design requirement of easy processing.
As described in above-mentioned embodiment 1, each antenna element of the present embodiment is stitched using microstrip feed line 1 to the T-shaped on floor
The differential feed of gap 3, two resonant frequencies can be produced, change L1 and L2+S2 adjustable in length resonant frequency, change T-shaped gap 3
Width W1 and W2 adjustable impedance bandwidth, such a structure differential feed combined with vertical gap can reach common mode inhibition effect
Fruit, and the 3 mutually orthogonal mode of T-shaped gap of four antenna elements of mimo antenna arranges, and separated with four rectangular apertures,
Can reach high-isolation, equally can suppression common mode signal, the differential mode S parameter that the mimo antenna of the present embodiment passes through Electromagnetic Simulation is bent
As shown in fig. 6, wherein S11 represents the differential mode return loss of first antenna unit 4, S21, S31, S41 are represented first day line respectively
The differential mode isolation of the antenna element 5 of line unit 4 and second, the antenna element 7 of third antenna unit 6 and the 4th；The present embodiment
Mimo antenna is by the common mode S parameter curve of Electromagnetic Simulation as shown in fig. 7, wherein S11 represents that the common mode of first antenna unit 4 is returned
Ripple is lost, and S21, S31, S41 represent the antenna element 5 of first antenna unit 4 and second, third antenna unit 6 and the 4th day respectively
The common-mode isolation degree of line unit 7.
In summary, the present invention can reach very high common mode inhibition effect using special differential feed structure and gap combination
Fruit, there is miniaturization, simple in construction, high cmrr, the advantages that two-band and high-isolation, can be widely applied to
Wlan system.
It is described above, patent preferred embodiment only of the present invention, but the protection domain of patent of the present invention is not limited to
This, such as the antenna element quantity of mimo antenna can also be two, any one skilled in the art is in this hair
In scope disclosed in bright patent, equivalent substitution or change are subject to according to the technical scheme of patent of the present invention and its inventive concept,
Belong to the protection domain of patent of the present invention.
Claims (5)
1. the difference gap mimo antenna with high cmrr, it is characterised in that：Including medium substrate and four antenna lists
Member, each antenna element include floor and microstrip feed line, and the floor is arranged on medium substrate top layer, and is etched with T-shaped gap,
The microstrip feed line is arranged on medium substrate bottom, and T-shaped gap is divided into open circuit gap and short-circuit gap, and open circuit gap is formed
Low frequency resonant modes, short-circuit gap form high-frequency resonant mode；The floor of four antenna elements is connected, and medium substrate top layer is covered
Lid；The T-shaped gap of four antenna elements is mutually orthogonal to be arranged on connected floor；Four are etched with the connected floor
Rectangular aperture, separated by four rectangular apertures between four antenna elements.
2. the difference gap mimo antenna according to claim 1 with high cmrr, it is characterised in that：It is described micro-
The concave structure of ribbon feeder, the both ends of the concave structure are respectively the first feed port and the second feed port, and described first presents
Electric port and the second feed port are located at the same edge of medium substrate bottom.
3. the difference gap mimo antenna according to claim 1 or 2 with high cmrr, it is characterised in that：Institute
State the low-frequency resonant frequency that open circuit gap is used to produce 2.4GHz, four points of operation wavelength when its current path length is 2.4GHz
One of；The short-circuit gap is used for the high-frequency resonant frequency for producing 5.5GHz, operating wave when its current path length is 5.5GHz
Long half.
4. the difference gap mimo antenna according to claim 1 or 2 with high cmrr, it is characterised in that：Institute
State medium substrate and use FR4 medium substrates, its dielectric constant is 4.4, thickness 0.8mm.
5. the difference gap mimo antenna according to claim 1 or 2 with high cmrr, it is characterised in that：Institute
State microstrip feed line and use 50 Ω microstrip feed lines.
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| CN201510270992.4A CN104882677B (en) | 2015-05-25 | 2015-05-25 | Difference gap mimo antenna with high cmrr |
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| CN201510270992.4A CN104882677B (en) | 2015-05-25 | 2015-05-25 | Difference gap mimo antenna with high cmrr |
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| CN104882677B true CN104882677B (en) | 2018-01-16 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105576372B (en) * | 2016-02-26 | 2019-05-14 | 华南理工大学 | A kind of miniaturization difference trap UWB-MIMO antenna |
| CN109672019B (en) * | 2017-10-17 | 2022-04-19 | 中兴通讯股份有限公司 | Terminal MIMO antenna device and method for realizing antenna signal transmission |
| CN109586017B (en) * | 2018-11-02 | 2019-12-03 | 南京航空航天大学 | A kind of wideband MIMO differential filtering slot antenna |
| CN110828998A (en) * | 2019-11-19 | 2020-02-21 | 榆林学院 | Dual-frequency four-unit millimeter wave microstrip slot MIMO antenna |
| CN113555692B (en) * | 2020-04-23 | 2023-02-03 | 华为技术有限公司 | Electronic equipment |
| CN114447617B (en) * | 2022-01-28 | 2023-08-15 | 江苏亿连通信技术有限公司 | Microstrip antenna structure based on microstrip line structure decoupling design and design method thereof |
| CN114976632B (en) * | 2022-06-15 | 2023-07-21 | 西安电子科技大学 | Compact type wide-band MIMO antenna based on multi-common mode differential mode |
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