CN204651491U - There is the difference gap mimo antenna of high cmrr - Google Patents
There is the difference gap mimo antenna of high cmrr Download PDFInfo
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- CN204651491U CN204651491U CN201520341503.5U CN201520341503U CN204651491U CN 204651491 U CN204651491 U CN 204651491U CN 201520341503 U CN201520341503 U CN 201520341503U CN 204651491 U CN204651491 U CN 204651491U
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Abstract
The utility model discloses a kind of difference gap mimo antenna with high cmrr, comprise medium substrate and multiple antenna element, described each antenna element comprises floor and microstrip feed line, described floor is arranged on medium substrate top layer, and be 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 floor of described multiple antenna element is connected, and is covered by medium substrate top layer.The utility model adopts special differential feed structure and gap combination can reach very high common mode inhibition effect, there is miniaturization, structure is simple, high cmrr, the advantage such as two-band and high-isolation, can meet miniaturization, low cost, easily with processing, be easy to the requirement integrated with difference channel, can wlan system be widely used in.
Description
Technical field
The utility model relates to a kind of mimo antenna, and especially a kind of difference gap mimo antenna with high cmrr, belongs to wireless mobile communications field.
Background technology
In recent years along with the fast development of wireless mobile communications, wireless mobile communications so as to improve message transmission rate resource---frequency bandwidth and transmitting power have all been on the verge of saturated.How the worsening shortages of what the high speed development of mobile communication brought is frequency spectrum resource, improve the research emphasis that the transmission rate of information and quality have become society on existing frequency spectrum resource.MIMO (Mutltiple-Input Multiple-Output, multiple-input and multiple-output) wireless communication technology because its do not need the resource of frequency of loss bandwidth sum transmitting power just can increase substantially the huge advantage of channel capacity and message transmission rate, enter the visual field of people.MIMO as the core technology of 802.11n, because it under the prerequisite not increasing transmission bandwidth or transmitting power, can considerably improve the reliability of channel capacity and transmission, become the emphasis of Chinese scholars research.Multi-antenna technology, as the core of MIMO technology, receives equally and pays close attention to widely.
Mimo antenna design is the key technology of MIMO communication system.MIMO technology utilizes multiple antennas to carry out transmitting/receiving diversity, thus obtains certain diversity gain; MIMO technology utilizes multiple antennas to carry out spatial reuse then can improve the availability of frequency spectrum, and the transmitting power not increasing system just can improve transmission rate widely.The isolation of mimo antenna is an important research direction, and the method increasing isolation at present mainly contains: EBG floor panel structure, Decoupling network, floor joint, reflector element, floor branch and Neutralization line.
The fast development of wireless communication technology, also promotes the needs of fully integrated radio frequency front-end product.Integrated RF front end adopts differential technique to realize usually, as one of the critical component of radio-frequency front-end, most of Antenna Design is one port devices, can not directly and difference channel integrated, usually need adopt Ba Lun differential signal is converted to single port signal then feed antenna.The use of Ba Lun can cause loss, and system effectiveness is reduced, and too increases the quantity of individual devices, is unfavorable for that system height is integrated and miniaturized.
Differential antennae changes the method for designing of traditional antenna, directly differential signal is fed into two ports of antenna, provides new approach for designing high integrated radio-frequency front-end.
According to investigations with understanding, disclosed prior art is as follows at present:
1) people such as Wen-Shan Chen, Chi-Huang Lin in 2011 and Hong-Twu Chen has delivered in the article being entitled as " A Compact Monopole Slot MIMO Antenna forWireless USB Dongle Application at WLAN Band " on Asia-PacificMicrowave Conference, adopt microstrip line to gap monopole feed, be designed to again mimo antenna, achieve the work of the 2.4GHz frequency range of WLAN, and reach certain isolation.Antenna size is less, but ground board size is comparatively large, and just achieves the work of a WLAN frequency range.
2) in December, 2013 Reza Karimian, Homayoon Oraizi, the people such as Saeed Fakhte and MohammadFarahani deliver the article being entitled as " Novel F-Shaped Quad-Band Printed Slot Antennafor WLAN andWiMAXMIMOSystems " on " IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS ", adopt microstrip line to the F shape cutler feed on floor, add the minor matters in F shape gap, achieve the work of four frequency ranges comprising WiMax and WLAN, and four frequencies can independently control, do again the mutually orthogonal mimo antenna of four unit afterwards.The design of antenna have employed the size that open circuit gap structure reduces antenna greatly, but the high band bandwidth in mimo antenna four frequency bands is narrow, and the isolation between unit neither be 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.
Utility model content
The purpose of this utility model is the defect in order to solve above-mentioned prior art, and provide a kind of difference gap mimo antenna with high cmrr, this mimo antenna structure is simple, miniaturization can be met, low cost, easily with processing, is easy to the requirement integrated with difference channel.
The purpose of this utility model can reach by taking following technical scheme:
There is the difference gap mimo antenna of high cmrr, comprise medium substrate and multiple antenna element, described each antenna element comprises floor and microstrip feed line, described floor is arranged on medium substrate top layer, and be 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 floor of described multiple antenna element is connected, and is covered by medium substrate top layer.
As a kind of preferred version, described microstrip feed line is concave structure, and the two ends of this concave structure are respectively the first feed port and the second feed port, and described first feed port and the second feed port are positioned at the same edge of medium substrate bottom.
As a kind of preferred version, described connected floor is etched with rectangular aperture, is separated by rectangular aperture between described multiple antenna element.
As a kind of preferred version, described antenna element has four, and the T-shaped gap of four antenna elements is mutually orthogonal to be arranged on connected floor; Described connected floor is etched with four rectangular apertures, is separated by four rectangular apertures between described four antenna elements.
As a kind of preferred version, described open circuit gap for generation of the low-frequency resonant frequency of 2.4GHz, when its current path length is 2.4GHz operation wavelength 1/4th; Described short circuit gap for generation of the high-frequency resonant frequency of 5.5GHz, when its current path length is 5.5GHz operation wavelength 1/2nd.
As a kind of preferred version, described medium substrate adopts FR4 medium substrate, and its dielectric constant is 4.4, and thickness is 0.8mm.
As a kind of preferred version, described microstrip feed line adopts 50 Ω microstrip feed lines.
The utility model has following beneficial effect relative to prior art:
1, each antenna element of the present utility model is etched with T-shaped gap on floor, and adopt microstrip feed line to carry out differential feed to the T-shaped gap on floor, T-shaped gap is divided into open circuit gap and short circuit gap by microstrip feed line, open circuit gap forms low frequency resonant modes, short circuit gap forms high-frequency resonant mode, the use in open circuit gap substantially reduces the size of antenna, and two modes of resonance cover 2.4/5.2/5.8GHz tri-working frequency range of WLAN; By regulating the length in T-shaped gap and width can adjustment resonance frequency independently and impedance bandwidth.
2, the utility model overcomes the common mode inhibition of traditional antenna, be difficult to the problem with the system integration, adopt special differential feed structure and gap combination can reach very high common mode inhibition effect, mimo antenna is rearranged again by mutually orthogonal for four antenna elements, floor etches rectangular aperture antenna element is separated, when not affecting antenna element S parameter, also add the isolation between antenna element.
3, the utility model overcomes and covers WLAN tri-band antenna complex structure, and size is large, and unmanageable shortcoming, has miniaturization, and structure is simple, and high cmrr, the advantage such as two-band and high-isolation, can be widely used in wlan system.
Accompanying drawing explanation
Fig. 1 is antenna element top level structure schematic diagram of the present utility model.
Fig. 2 is antenna element fabric schematic diagram of the present utility model.
Fig. 3 is the S parameter curve chart of antenna element of the present utility model by Electromagnetic Simulation.
Fig. 4 is mimo antenna top level structure schematic diagram of the present utility model.
Fig. 5 is mimo antenna fabric schematic diagram of the present utility model.
Fig. 6 is the differential mode S parameter curve chart of mimo antenna of the present utility model by Electromagnetic Simulation.
Fig. 7 is the common mode S parameter curve chart of mimo antenna of the present utility model by Electromagnetic Simulation.
Wherein, 1-microstrip feed line, 2-medium substrate, 3-T shape gap, 4-first antenna element, 5-second antenna element, 6-third antenna unit, 7-the 4th antenna element, 8-first rectangular aperture, 9-second rectangular aperture, 10-the 3rd rectangular aperture, 11-the 4th rectangular aperture, Port1-first feed port, Port2-second feed port.
Embodiment
Embodiment 1:
As depicted in figs. 1 and 2, the antenna element of the present embodiment comprises floor and microstrip feed line 1, and described floor is arranged on medium substrate 2 top layer, and is etched with T-shaped gap 3, and described microstrip feed line 1 is arranged on medium substrate 2 bottom;
Described microstrip feed line 1 is in concave structure, the two ends of this concave structure are respectively the first feed port Port1 and the second feed port Port2, described first feed port Port1 and the second feed port Port2 is positioned at the same edge of medium substrate bottom, as can be seen from Figure 2, with traditional differential feed unlike, first feed port Port1 and the second feed port Port2 of the present embodiment differential feed are directly connected, the first feed port Port1 and the second feed port Port2 differential signal that feed-in amplitude is identical respectively, phase place is contrary;
Described T-shaped gap 3 can produce two resonance frequencys, and T-shaped gap 3 is divided into open circuit gap and short circuit gap by microstrip feed line 1, and the low-frequency resonant frequency of gap for generation of 2.4GHz of wherein opening a way, its current path is the length of L1, L1 is probably 2.4GHz's
wherein λ
grefer to operation wavelength during 2.4GHz; Short circuit gap for generation of the high-frequency resonant frequency of 5.5GHz, 1/2 λ of its current path to be the length of L2+S2, L2+S2 be probably 5.5GHz
g, wherein λ
grefer to operation wavelength during 5.5GHz; The centre frequency of two frequency ranges independently can adjust by changing the length of L1 and L2+S2, and impedance bandwidth also independently can be adjusted by the width W 1 and W2 changing T-shaped gap 3; Centre frequency is the impedance bandwidth of 2.4GHz is 180M (2.35-2.56GHz), and centre frequency is 5.5GHz impedance bandwidth is 800M (5.1-5.9GHz).Adopt the common mode inhibition that this differential feed structure can reach very high, for difference mode signal, the signal phase of the first feed port Port1 and the second feed port Port2 is contrary, electrical potential difference can be produced at edge c1, the c2 in T-shaped gap 3, T-shaped gap 3 on floor will be encouraged by electrical potential difference, signal will be transferred on floor by strong electromagnetic coupled, so difference mode signal can radiate; For common-mode signal, first feed port Port1 is identical with the signal phase of the second feed port Port2, amplitude is identical, electrical potential difference can not be produced at edge c1, the c2 in T-shaped gap 3, such T-shaped gap 3 would not be energized, common-mode signal can not be coupled on floor, so common-mode signal is reflected back completely, reach the effect that common-mode signal suppresses; The antenna element of the present embodiment passes through the S parameter curve of Electromagnetic Simulation as shown in Figure 3, wherein S11
ddrepresent the differential mode return loss of antenna element, S11
ccrepresent 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 comprises four antenna elements (antenna element of above-described embodiment 1) and medium substrate 2, and wherein medium substrate 2 adopts FR4 medium substrate, and its dielectric constant is 4.4, and thickness is 0.8mm; Four antenna elements are respectively the first antenna element 4, second antenna element 5, third antenna unit 6 and the 4th antenna element 7, have eight feed port, and the floor of four antenna elements is connected, and is printed on FR4 medium substrate top layer; The microstrip feed line 1 of four antenna elements adopts 50 Ω microstrip feed lines, and is printed on FR4 medium substrate bottom, utilizes feed port to carry out differential feed to the T-shaped gap 3 on floor; The T-shaped gap 3 of four antenna elements is mutually orthogonal to be arranged on connected floor, the floor be connected also is etched with four rectangular apertures, be respectively the first rectangular aperture 8, second rectangular aperture 9, the 3rd rectangular aperture 10 and the 4th rectangular aperture 11, separated by four rectangular apertures between described four antenna elements, when not affecting antenna element S parameter, also add the isolation (all higher than 15dB in all frequency bands) between antenna element.As can be seen here, cut off with orthogonal arrangement and rectangular aperture in the present embodiment and increase isolation, affect bandwidth of operation hardly, achieve high-isolation, structure is simple, miniaturized, the designing requirement of easily processing.
As as described in above-described embodiment 1, each antenna element of the present embodiment adopts T-shaped gap 3 differential feed on microstrip feed line 1 pair of floor, two resonance frequencys can be produced, change the adjustable in length resonance frequency of L1 and L2+S2, change width W 1 and the W2 adjustable impedance bandwidth in T-shaped gap 3, this kind of structure differential feed is combined with vertical gap and can reaches common mode inhibition effect, and the mutually orthogonal mode in T-shaped gap 3 of four of mimo antenna antenna elements arranges, and separate with four rectangular apertures, high-isolation can be reached, common-mode signal can be suppressed equally, the mimo antenna of the present embodiment passes through the differential mode S parameter curve of Electromagnetic Simulation as shown in Figure 6, wherein S11 represents the differential mode return loss of the first antenna element 4, S21, S31, S41 represents the first antenna element 4 and the second antenna element 5 respectively, the differential mode isolation of third antenna unit 6 and the 4th antenna element 7, the mimo antenna of the present embodiment passes through the common mode S parameter curve of Electromagnetic Simulation as shown in Figure 7, wherein S11 represents the common mode return loss of the first antenna element 4, and S21, S31, S41 represent the common-mode isolation degree of the first antenna element 4 and the second antenna element 5, third antenna unit 6 and the 4th antenna element 7 respectively.
In sum, the utility model adopts special differential feed structure and gap combination can reach very high common mode inhibition effect, and have miniaturization, structure is simple, and high cmrr, the advantage such as two-band and high-isolation, can be widely used in wlan system.
The above; be only the utility model patent preferred embodiment; but the protection range of the utility model patent is not limited thereto; the antenna element quantity of such as mimo antenna can also be two; anyly be familiar with those skilled in the art in the scope disclosed in the utility model patent; be equal to according to the technical scheme of the utility model patent and utility model design thereof and replaced or change, all belonged to the protection range of the utility model patent.
Claims (7)
1. there is the difference gap mimo antenna of high cmrr, comprise medium substrate and multiple antenna element, it is characterized in that: described each antenna element comprises floor and microstrip feed line, described floor is arranged on medium substrate top layer, and be 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 floor of described multiple antenna element is connected, and is covered by medium substrate top layer.
2. the difference gap mimo antenna with high cmrr according to claim 1, it is characterized in that: described microstrip feed line is concave structure, the two ends of this concave structure are respectively the first feed port and the second feed port, and described first feed port and the second feed port are positioned at the same edge of medium substrate bottom.
3. the difference gap mimo antenna with high cmrr according to claim 1, be is characterized in that: described connected floor is etched with rectangular aperture, is separated between described multiple antenna element by rectangular aperture.
4. the difference gap mimo antenna with high cmrr according to claim 2, is characterized in that: described antenna element has four, and the T-shaped gap of four antenna elements is mutually orthogonal to be arranged on connected floor; Described connected floor is etched with four rectangular apertures, is separated by four rectangular apertures between described four antenna elements.
5. the difference gap mimo antenna with high cmrr according to any one of claim 1-4, it is characterized in that: described open circuit gap for generation of the low-frequency resonant frequency of 2.4GHz, when its current path length is 2.4GHz operation wavelength 1/4th; Described short circuit gap for generation of the high-frequency resonant frequency of 5.5GHz, when its current path length is 5.5GHz operation wavelength 1/2nd.
6. the difference gap mimo antenna with high cmrr according to any one of claim 1-4, is characterized in that: described medium substrate adopts FR4 medium substrate, and its dielectric constant is 4.4, and thickness is 0.8mm.
7. the difference gap mimo antenna with high cmrr according to any one of claim 1-4, is characterized in that: described microstrip feed line adopts 50 Ω microstrip feed lines.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520341503.5U CN204651491U (en) | 2015-05-25 | 2015-05-25 | There is the difference gap mimo antenna of high cmrr |
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| CN201520341503.5U CN204651491U (en) | 2015-05-25 | 2015-05-25 | There is the difference gap mimo antenna of high cmrr |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882677A (en) * | 2015-05-25 | 2015-09-02 | 华南理工大学 | Difference slit MIMO (Multiple Input Multiple Output) antenna with high common mode rejection ratio |
| CN105552553A (en) * | 2015-12-07 | 2016-05-04 | 华南理工大学 | Miniature three-frequency four-unit MIMO antenna |
| WO2018058477A1 (en) * | 2016-09-29 | 2018-04-05 | 华为技术有限公司 | Terminal |
| CN108767429A (en) * | 2018-06-06 | 2018-11-06 | 中国科学技术大学 | Micro-strip leaky wave antenna towards the application of ultra-high-frequency passive RFID Distributed coverages |
-
2015
- 2015-05-25 CN CN201520341503.5U patent/CN204651491U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882677A (en) * | 2015-05-25 | 2015-09-02 | 华南理工大学 | Difference slit MIMO (Multiple Input Multiple Output) antenna with high common mode rejection ratio |
| CN104882677B (en) * | 2015-05-25 | 2018-01-16 | 华南理工大学 | Difference gap mimo antenna with high cmrr |
| CN105552553A (en) * | 2015-12-07 | 2016-05-04 | 华南理工大学 | Miniature three-frequency four-unit MIMO antenna |
| WO2018058477A1 (en) * | 2016-09-29 | 2018-04-05 | 华为技术有限公司 | Terminal |
| US11114746B2 (en) | 2016-09-29 | 2021-09-07 | Huawei Technologies Co., Ltd. | Terminal |
| CN108767429A (en) * | 2018-06-06 | 2018-11-06 | 中国科学技术大学 | Micro-strip leaky wave antenna towards the application of ultra-high-frequency passive RFID Distributed coverages |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150916 Termination date: 20180525 |