CN111293432A - Tri-frequency binary MIMO antenna capable of being used for WLAN/WiMAX/5G - Google Patents
Tri-frequency binary MIMO antenna capable of being used for WLAN/WiMAX/5G Download PDFInfo
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- CN111293432A CN111293432A CN202010197159.2A CN202010197159A CN111293432A CN 111293432 A CN111293432 A CN 111293432A CN 202010197159 A CN202010197159 A CN 202010197159A CN 111293432 A CN111293432 A CN 111293432A
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- 230000005855 radiation Effects 0.000 claims abstract description 28
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 230000007935 neutral effect Effects 0.000 claims description 5
- 230000005404 monopole Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 12
- 238000004891 communication Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 230000003472 neutralizing effect Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000012938 design process Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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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
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
- H01Q5/28—Arrangements for establishing polarisation or beam width over two or more different wavebands
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
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Abstract
The invention relates to a three-frequency binary MIMO antenna for WLAN/WiMAX/5G, which comprises a substrate, an antenna and a floor, and is characterized in that the antenna comprises two radiation units, wherein the radiation units are provided with high-frequency branches, the floor is arranged corresponding to the radiation units, the two floors are provided with low-frequency branches, the low-frequency branches are adjacent, the high-frequency branches are positioned at one side of the radiation units far away from the low-frequency branches, and the whole antenna is of a symmetrical structure. Compared with the prior art, the invention has the advantages of better isolation, low loss, miniaturization and the like.
Description
Technical Field
The invention relates to an MIMO antenna, in particular to a three-frequency binary MIMO antenna which can be used for WLAN/WiMAX/5G.
Background
With the development of the mobile internet, more and more devices are connected to the mobile network, new services and applications are in a variety, and the soaring of mobile data traffic will bring a serious challenge to the network. In order to meet the increasing mobile traffic demand, a new generation of 5G mobile communication network is required to be developed. Compared with other networks, the 5G network has the advantages that the speed is higher, the capacity is larger, the time delay in the transmission process is greatly shortened, the network connection is wider and quicker, the data processing speed and the data processing quantity are obviously improved, and the interconnection and the intercommunication among platforms can be really realized. In 11 months in 2017, the use frequency bands of 5G mobile communication released by the Ministry of industry and communications of China are 3300MHz-3600MHz and 4800MHz-5000MHz, so that the antenna designed by the Ministry of industry and communications of China is suitable for the working frequency band of 5G and has wide practical application value.
With the increasing demand of wireless communication for data volume, a spectrum resource with a certain capacity limits the rapid development of a communication system to a great extent, and a series of researches show that the MIMO antenna technology is a key technology for improving the channel capacity in communication. As early as the 20 th century, fosschini and teltar et al, the united states bell laboratories, were the first to propose the concept of multi-antenna multiplexing based on an exploration of the system channel capacity, which is also the beginning of the research on MIMO (Multiple-Input Multiple-Output) technology. The most difficult point of the MIMO technology is the design of multiple antennas, and two parameters, namely, antenna elements and the number thereof, need to be considered in an important way. However, for miniaturized mobile terminal devices, it is a difficult problem to put multiple antennas and keep the performance of the antennas good, so two major difficulties in the design process of mobile terminal antennas are the antenna unit spacing and number, and how to embed multiple antennas in the miniaturized device and ensure that the antenna elements have high isolation is a major research point and difficulty of the current MIMO technology.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned drawbacks of the prior art and to provide a triple-band binary MIMO antenna for WLAN/WiMAX/5G with high isolation.
The purpose of the invention can be realized by the following technical scheme:
a three-frequency binary MIMO antenna applicable to WLAN/WiMAX/5G comprises a substrate, an antenna and a floor, wherein the antenna comprises two radiation units, the radiation units are provided with high-frequency branches, the floor and the radiation units are correspondingly arranged, the two floors are provided with low-frequency branches, the low-frequency branches are adjacent, the high-frequency branches are positioned on one side of the radiation units far away from the low-frequency branches, and the whole antenna is of a symmetrical structure.
The two floors are connected through a neutralization line.
The neutralizing line is in a shape like a Chinese character 'ji', and the protruding direction of the Chinese character 'ji' is the same as the extending direction of the low-frequency branches.
The high-frequency branch knot is L-shaped.
The floor is provided with a groove, and the groove is positioned at the joint of the floor and the corresponding radiation unit.
The radiation unit is a rectangular monopole radiation patch.
The size of the antenna is 30mm 56 mm.
The antenna is a coplanar waveguide feed antenna.
The substrate is made of FR4 material.
Compared with the prior art, the invention has the following advantages:
(1) feeding by using a coplanar waveguide: the coplanar waveguide (CPW) feed is adopted, compared with the side feed, the integrated design is easier, the signal transmission line and the floor are arranged on the same side of the dielectric plate, so that the series connection or the parallel connection with other microwave devices can be realized, the drilling on a substrate is not needed, and the miniaturization of a circuit and the integrity of signals can be realized; the radiation loss of the coplanar waveguide is relatively small, and the polarization purity and the working efficiency of the antenna can be improved.
(2) MIMO binary antenna: the two floors are connected through a neutral line, so that decoupling between the radiation units is realized. First, the radiation units are symmetrically arranged, and the branches protruding from the floor are adjacent, so that mutual coupling among the radiation units can be effectively reduced. However, the actual use requirement cannot be met only by symmetrical arrangement, so that the addition of the neutral line between the floors can realize obvious improvement of the isolation degree of the low end on the basis.
(3) Three-frequency performance: the antenna meets two frequency bands of 5G, a WLAN low frequency band, a WLAN middle frequency band and a WiMAX middle and high frequency band through simulation test, and the specific covered frequency bands are 2.4-2.48GHz, 3.3-3.7GHz and 4.8-6.0 GHz. The antenna designed at this time is designed according to the required frequency band of 5G, and a three-frequency antenna is designed by utilizing the wavelength radiation characteristic of the monopole antenna 1/4 so as to work in three frequency bands respectively. And through the size optimization of the simulation antenna, the return loss of the antenna meets the requirement, and the practical requirement of WLAN/WiMAX/5G communication is met.
(4) Miniaturization of antenna size: for practical purposes, the antenna is being developed towards miniaturization, which is advantageous for integration and installation, especially in portable devices, and based on this, the design miniaturizes the size of the dielectric plate of the antenna in a qualified range while ensuring the antenna performance, and finally controls the size to 30mm × 56mm, which is a significant advantage in size for the currently existing triple-frequency binary MIMO antenna.
Drawings
Fig. 1 is a schematic diagram of an antenna structure according to the present embodiment;
fig. 2 shows simulation results of return loss S11 of the antenna of the present embodiment;
fig. 3 shows simulation results of the antenna isolation S12 according to the present embodiment;
reference numerals:
1 is a substrate; 2 is a radiation unit; 3 is a floor; 4 is a low-frequency branch knot; 5 is a high-frequency branch knot; and 6 is a neutralization line.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Examples
As shown in fig. 1, a three-frequency binary MIMO antenna for WLAN/WiMAX/5G includes a substrate 1, an antenna and a floor 3, the antenna includes two radiating units 2, the radiating units 2 are provided with L-shaped high-frequency branches 5, the floor 3 is disposed corresponding to the radiating units 2, the two floors 2 are each provided with a low-frequency branch 4, the low-frequency branches 4 are adjacent to each other, the high-frequency branches 5 are located on one side of the radiating units 2 away from the low-frequency branches 4, and the antenna is a symmetrical structure as a whole. The radiation unit 2 is a rectangular monopole radiation patch. The antenna is a coplanar waveguide feed antenna. The substrate 1 is made of FR4 material.
Currently, MIMO technology is gaining wide attention with its unique advantages. The technology uses a plurality of antennas at the transmitting end and the receiving end of the system respectively, makes full use of space resources to enable signals to be transmitted and received by a plurality of antennas, greatly improves the channel capacity on the premise of not increasing additional transmitting power and spectrum resources, and can greatly improve the wireless communication quality. There are certain difficulties in obtaining higher channel capacity by using MIMO technology, and the biggest difficulty is in the design of multiple antennas. Two parameters of the antenna elements and the number of the antenna elements are considered in an important mode, and when a large number of antennas are placed at a base station end of mobile communication, the practical application of the antennas cannot be influenced due to the small limitation of the volume factor of equipment. However, for miniaturized mobile terminal devices, it is a difficult problem to put multiple antennas and keep the performance of the antennas good, so two major difficulties in the design process of the mobile terminal antennas are the antenna element spacing and the number. With the widespread application of MIMO technology, many methods capable of improving isolation are being studied in large quantities, such as polarization diversity technology, neutral line technology, floor stubs, parasitic elements, decoupling networks, defected ground structures, and metamaterial technology.
The rectangular radiation patch of the MIMO antenna unit of the embodiment realizes 4.8GHZ-6.0GHZ, the high-frequency branch protruding from the rectangular radiation patch realizes 3.3GHZ-3.7GHZ, and the low-frequency branch protruding from the floor realizes 2.4GHZ-2.48 GHZ.
In order to further improve the isolation of the MIMO antenna, the antenna units are symmetrically arranged, the low-frequency branches 4 protruding from the floor 3 are adjacent to each other, and partial isolation is realized between the radiation units 2, but the isolation cannot meet the actual requirement, then a neutralization line 6 is introduced between the floors 3 to counteract the mutual influence between the antennas caused by radiation waves, and particularly the isolation at the low frequency is effectively improved. The neutralizing line 6 is in a shape of a Chinese character ji, and the protruding direction of the Chinese character ji is the same as the extending direction of the low-frequency branch knot 4.
The floor 3 is provided with a groove which is positioned at the joint of the floor 3 and the corresponding radiation unit 2.
The design can ensure the antenna performance to be within the qualified range, miniaturize the size of the dielectric plate of the antenna, and finally control the size to 30mm x 56 mm.
As shown in fig. 2 and 3, the return loss S11 and the isolation S12 of the antenna of the present design change with time. In fig. 2, the S11 in the frequency ranges of 2.4GHZ-2.48GHZ, 3.4GHZ-3.7GHZ and 4.8-6.0GHZ are all-10 dB, the lowest S11 at the resonance point can reach-20 dB or less, and the return loss meets the requirements in practical engineering. In fig. 3, the neutralizing line is added between the antenna units, so that the current in the neutralizing line and the coupling current are cancelled out, and the mutual influence is reduced, so that the isolation degree S12 reaches below-20 dB in the frequency ranges of 2.4GHZ-2.48GHZ, 3.4GHZ-3.7GHZ and 4.8-6.0 GHZ.
Claims (9)
1. A three-frequency binary MIMO antenna applicable to WLAN/WiMAX/5G comprises a substrate, an antenna and a floor, and is characterized in that the antenna comprises two radiation units, wherein the radiation units are provided with high-frequency branches, the floor and the radiation units are correspondingly arranged, the two floors are both provided with low-frequency branches, the low-frequency branches are adjacent, the high-frequency branches are positioned on one side of the radiation units far away from the low-frequency branches, and the whole antenna is of a symmetrical structure.
2. The tri-band binary MIMO antenna for WLAN/WiMAX/5G as claimed in claim 1, wherein the two floors are connected by a neutral line.
3. The tri-band binary MIMO antenna for WLAN/WiMAX/5G according to claim 2, wherein the neutral line is in a zigzag shape, and the convex direction of the zigzag shape is the same as the extending direction of the low frequency branches.
4. The tri-band binary MIMO antenna for WLAN/WiMAX/5G according to claim 1, wherein the high frequency branches are L-shaped.
5. The tri-band binary MIMO antenna for WLAN/WiMAX/5G according to claim 1, wherein the floor is provided with a groove, and the groove is located at the joint of the floor and the corresponding radiating element.
6. The tri-band binary MIMO antenna for WLAN/WiMAX/5G according to claim 1, wherein the radiating element is a rectangular monopole radiating patch.
7. The tri-band binary MIMO antenna for WLAN/WiMAX/5G according to claim 1, wherein the size of the antenna is 30mm x 56 mm.
8. The tri-band binary MIMO antenna for WLAN/WiMAX/5G according to claim 1, wherein the antenna is a coplanar waveguide feed antenna.
9. The tri-band binary MIMO antenna for WLAN/WiMAX/5G as claimed in claim 1, wherein the substrate is made of FR4 material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010197159.2A CN111293432A (en) | 2020-03-19 | 2020-03-19 | Tri-frequency binary MIMO antenna capable of being used for WLAN/WiMAX/5G |
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| CN202010197159.2A CN111293432A (en) | 2020-03-19 | 2020-03-19 | Tri-frequency binary MIMO antenna capable of being used for WLAN/WiMAX/5G |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300105A (en) * | 2021-04-29 | 2021-08-24 | 郑州中科集成电路与信息系统产业创新研究院 | Ultra-wideband multiple-input multiple-output antenna with high isolation |
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| CN104022353A (en) * | 2014-06-12 | 2014-09-03 | 电子科技大学 | Multi-band MIMO antenna used for intelligent machine |
| CN105406183A (en) * | 2015-12-04 | 2016-03-16 | 华南理工大学 | Triple-band MIMO (Multiple Input Multiple Output) antenna used for WLAN (Wireless Local Area Network) and WIMAX (World Interoperability for Microwave Access) |
| CN106785370A (en) * | 2016-12-29 | 2017-05-31 | 重庆邮电大学 | A kind of mimo antenna of the high-isolation for mobile terminal |
| CN109509975A (en) * | 2018-12-23 | 2019-03-22 | 上海电力学院 | A kind of flexible 5G multifrequency antenna based on liquid crystal polymer |
| CN109904606A (en) * | 2019-03-13 | 2019-06-18 | 重庆邮电大学 | A kind of three four unit mimo antennas of frequency of high-isolation |
| CN211743397U (en) * | 2020-03-19 | 2020-10-23 | 上海电力大学 | Tri-frequency binary MIMO antenna capable of being used for WLAN/WiMAX/5G |
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2020
- 2020-03-19 CN CN202010197159.2A patent/CN111293432A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104022353A (en) * | 2014-06-12 | 2014-09-03 | 电子科技大学 | Multi-band MIMO antenna used for intelligent machine |
| CN105406183A (en) * | 2015-12-04 | 2016-03-16 | 华南理工大学 | Triple-band MIMO (Multiple Input Multiple Output) antenna used for WLAN (Wireless Local Area Network) and WIMAX (World Interoperability for Microwave Access) |
| CN106785370A (en) * | 2016-12-29 | 2017-05-31 | 重庆邮电大学 | A kind of mimo antenna of the high-isolation for mobile terminal |
| CN109509975A (en) * | 2018-12-23 | 2019-03-22 | 上海电力学院 | A kind of flexible 5G multifrequency antenna based on liquid crystal polymer |
| CN109904606A (en) * | 2019-03-13 | 2019-06-18 | 重庆邮电大学 | A kind of three four unit mimo antennas of frequency of high-isolation |
| CN211743397U (en) * | 2020-03-19 | 2020-10-23 | 上海电力大学 | Tri-frequency binary MIMO antenna capable of being used for WLAN/WiMAX/5G |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300105A (en) * | 2021-04-29 | 2021-08-24 | 郑州中科集成电路与信息系统产业创新研究院 | Ultra-wideband multiple-input multiple-output antenna with high isolation |
| CN113300105B (en) * | 2021-04-29 | 2022-11-01 | 郑州中科集成电路与系统应用研究院 | Ultra-wideband multiple-input multiple-output antenna with high isolation |
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