CN110970719A - Microstrip MIMO antenna structure and mobile terminal thereof - Google Patents
Microstrip MIMO antenna structure and mobile terminal thereof Download PDFInfo
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- CN110970719A CN110970719A CN201811141248.4A CN201811141248A CN110970719A CN 110970719 A CN110970719 A CN 110970719A CN 201811141248 A CN201811141248 A CN 201811141248A CN 110970719 A CN110970719 A CN 110970719A
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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
- H01Q1/50—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
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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
- H01Q1/523—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between antennas of an array
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/065—Patch antenna array
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Abstract
The invention discloses a microstrip MIMO antenna structure and a mobile terminal thereof, which comprise a rectangular medium substrate and four microstrip patch antennas which are arranged on the rectangular medium substrate, have the same structure and different arrangement directions, wherein each microstrip patch antenna comprises a feed point, a microstrip patch and a radiating metal patch loaded with a slot array; the adjacent slot arrays of the four microstrip patch antennas are mutually orthogonal in the arrangement direction, and the non-adjacent slot arrays are mutually parallel in the arrangement direction. The slot array is loaded in the antenna radiation patch, changes the current distribution on the surface of the antenna radiation patch, realizes the polarization orthogonality of the microstrip patch antenna, and weakens the coupling between the microstrip patch antennas under the condition of not changing the size of the substrate.
Description
Technical Field
The application relates to the technical field of terminal antennas, in particular to a microstrip MIMO antenna structure, a mobile terminal and a mobile terminal thereof.
Background
The deep integration of the internet and the mobile communication network promotes the almost endless requirements of the vast mobile users on data services, and simultaneously, the mobile network originally used for communication gradually evolves towards the direction of media. Although the scale of the 4G network tends to be stable due to the gradual establishment of the network, the problems of shortage of frequency resources, huge energy consumption and network optimization are not ignored. While promoting the 4G industrialization, research focusing on the new generation of wireless mobile communication technology has begun, and new leaps in the performance and industrial scale of mobile communication systems are being pursued, and the 5G concept is being developed. According to the definition of IMT-2020(5G) propulsion group in China, 5G needs to have higher performance than 4G, support the user experience rate of 0.1-1 Gbit/s, the connection density of one million per square kilometer, the end-to-end time delay of millisecond level, the flow density of dozens of Tbit/s per square kilometer, the mobility of more than 500km/h and the peak rate of dozens of Gbit/s. In terms of key technologies, ultra-dense networking, massive multiple-input multiple-output MIMO, non-orthogonal transmission, high-band communication, C-RAN, SDN/NFV, Content Delivery Network (CDN), etc. are all considered as potential key technologies for 5G.
In terms of the air interface, massive MIMO systems are one of the most important technologies to solve the wireless data service exponential growth problem by using spatial multiplexing and interference mitigation. The MIMO (Multiple-Input Multiple-Output) technology is to use a plurality of transmitting antennas and receiving antennas at a transmitting end and a receiving end, respectively, so that signals are transmitted and received through the plurality of antennas at the transmitting end and the receiving end, thereby improving communication quality. The multi-antenna multi-transmission multi-reception mobile communication system can fully utilize space resources, realizes multi-transmission and multi-reception through a plurality of antennas, can improve the system channel capacity by times under the condition of not increasing frequency spectrum resources and antenna transmitting power, shows obvious advantages, and is regarded as the core technology of next generation mobile communication. The array antenna is a necessary condition of large-scale MIMO, and the design scheme of the antenna and the realization of the large-scale MIMO system are very important, even directly influencing the performance index of the 5G system. However, as the number of antennas increases, coupling between the element antennas becomes significant and the correlation coefficient becomes large. The method for realizing antenna miniaturization and multi-band mainly comprises a coupling feed method and a loading lumped element method, however, it is difficult to place a plurality of antennas on a small handheld terminal such as a mobile phone, because the size of the mobile phone is very small and the space between antenna units placed in the mobile phone is not large, current flows between the antennas and the ground of the mobile phone, so that strong mutual coupling effect exists between the antennas and the ground of the mobile phone; the mutual coupling has a serious influence on the improvement of the communication capacity of the whole MIMO system. The existing way to reduce the effect of mutual antenna coupling is to make a trade-off in antenna headroom and layout. The disadvantages brought by this way are that the limited size makes the low frequency difficult to realize and is not beneficial to the miniaturization of the terminal product; even the overall size has to be increased in order to increase the performance of the antenna.
Disclosure of Invention
The microstrip MIMO antenna structure and the mobile terminal thereof provided by the embodiment of the invention aim to solve the problem that the mode of reducing the antenna mutual coupling effect of the existing small-size terminal product is difficult to realize.
In order to achieve the above object, according to a first aspect of the embodiments of the present invention, a microstrip MIMO antenna structure is provided, including a rectangular dielectric substrate and four microstrip patch antennas, which are arranged on the rectangular dielectric substrate and have the same structure and different arrangement directions, where the microstrip patch antennas include a feed point, a microstrip patch, and a radiating metal patch loaded with a slot array; the adjacent slot arrays of the four microstrip patch antennas are mutually orthogonal in the arrangement direction, and the non-adjacent slot arrays are mutually parallel in the arrangement direction.
According to a second aspect of embodiments of the present invention, there is provided a mobile terminal having the above microstrip MIMO antenna structure.
According to the technical scheme, it can be seen that the microstrip MIMO antenna structure and the mobile terminal thereof according to the embodiments of the present invention include four microstrip patch antennas having the same structure and different arrangement directions on a rectangular dielectric substrate, where each microstrip patch antenna includes a feed point, a microstrip patch, and a radiating metal patch loaded with a slot array; adjacent slot arrays of the four microstrip patch antennas are mutually orthogonal in the arrangement direction, and non-adjacent slot arrays are mutually parallel in the arrangement direction; the slot array is loaded in the antenna radiation patch, changes the current distribution on the surface of the antenna radiation patch, realizes the polarization orthogonality of the microstrip patch antenna, and weakens the coupling between the microstrip patch antennas under the condition of not changing the size of the substrate.
Drawings
Fig. 1 is a schematic diagram of a first microstrip MIMO antenna structure according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a second microstrip MIMO antenna structure according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a third microstrip MIMO antenna configuration according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a fourth microstrip MIMO antenna configuration according to an embodiment of the present invention;
fig. 5 is a S11 parameter diagram for a microstrip MIMO antenna structure according to an embodiment of the present invention;
figure 6 is a graph of isolation parameters for a microstrip MIMO antenna structure according to an embodiment of the present invention;
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following description, suffixes such as "module", "part", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no peculiar meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
The terminal may be implemented in various forms. For example, the terminal described in the present invention may include terminals such as a set-top box, a mobile terminal, a smart phone, a notebook computer, a digital broadcast receiver, a PDA (personal digital assistant), a PAD (tablet computer), a PMP (portable multimedia player), a navigation device, and the like, and fixed terminals such as a digital TV, a desktop computer, and the like. In addition, the terminal is a Tracker and wearable type of terminal product. However, it will be understood by those skilled in the art that the configuration according to the embodiment of the present invention can be applied to a fixed type terminal in addition to elements particularly used for moving purposes.
Example 1
As shown in fig. 1, an embodiment of the present invention provides a microstrip MIMO antenna structure, including a rectangular dielectric substrate and four microstrip patch antennas, which are arranged on the rectangular dielectric substrate and have the same structure and different arrangement directions, where the microstrip patch antennas include a feed point 4, a microstrip patch 3, and a radiating metal patch 2 loaded with a slot array 1; the adjacent slot arrays 1 of the four microstrip patch antennas are mutually orthogonal in the arrangement direction, and the non-adjacent slot arrays 1 are mutually parallel in the arrangement direction.
As shown in fig. 1, the microstrip MIMO antenna structure includes four microstrip patch antennas with the same structure and different arrangement directions etched in the same rectangular dielectric substrate of 25mm × 1.0mm, and the distance between the microstrip patch antennas is 5 mm.
Specifically, the radiating metal patch 2 and the loading slot array 1 of the microstrip patch antenna are mutually orthogonal in the arrangement direction, the microstrip patch 3 is attached to one side edge of the rectangular dielectric substrate, one end of the radiating metal patch 2 is in contact connection with the microstrip patch 3, and the microstrip patch 3 is provided with the feed point 4.
As shown in fig. 2, one end of the radiating metal patch 2 is coupled to the microstrip patch 3 for feeding, and the microstrip patch 3 is provided with the feeding point 4.
Optionally, the four microstrip patch antennas are respectively arranged at four vertex angles of the rectangular dielectric substrate, and the distance between adjacent microstrip patch antennas is 5 mm.
Optionally, an angle of 45 ° is formed between each of the radiation metal patch 2 and the slot array 1 and the side edge of the rectangular dielectric substrate, and the metal line widths of the radiation metal patch 2 and the slot array 1 are different. The metal wire of the antenna is composed of two sections with different widths, and the narrower section is used for finishing impedance change and optimizing port impedance matching of the antenna. The slot array loaded in the radiating metal patch can change the current direction on the metal patch, thereby changing the polarization characteristic of the antenna. As can be seen from fig. 1, the slot array loaded in the radiating metal patch makes an angle of 45 ° with the edge of the microstrip patch, so that the polarizations between adjacent microstrip patch antennas are orthogonal. However, the slot arrays loaded in the non-adjacent antennas are parallel to each other, the distance between the slot arrays is long, and the coupling between the antennas is very weak.
As shown in fig. 3, the microstrip patches 3 of the four microstrip patch antennas are respectively disposed on four sides of the rectangular dielectric substrate, and the microstrip patch antennas are disposed perpendicular to each other. The four antennas are arranged in a mutually vertical mode, so that the isolation is further improved; can be flexibly changed according to the layout requirements of products.
As shown in fig. 4, two sets of the microstrip patch antennas are respectively disposed on the rectangular dielectric substrate, the two sets of the microstrip patch antennas are disposed on the rectangular dielectric substrate in an isolated manner, and each set of four microstrip patch antennas forms the microstrip MIMO antenna structure. 8 microstrip MIMO antenna structures are formed on the rectangular dielectric substrate, and the microstrip MIMO antenna structure is suitable for 5G terminal products.
The rectangular dielectric substrate is provided with two groups of microstrip patch antennas, the two groups of microstrip patch antennas are arranged on the rectangular dielectric substrate in an isolated mode, the microstrip patches of the four microstrip patch antennas in each group are arranged in four mutually perpendicular directions, and the microstrip patch antennas are arranged in a mutually perpendicular mode.
The above description is only an example of the present invention applied to the wireless terminal access product such as 5G mobile phone, and any modification, equivalent replacement, improvement, etc. made in the aspects of different antenna structures, different antenna forms, combination, and link modes, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Example 2
According to a second aspect of embodiments of the present invention, there is provided a mobile terminal having the above microstrip MIMO antenna structure.
The 5G microstrip MIMO antenna structure of the technical scheme is subjected to simulation analysis by utilizing electromagnetic simulation software; in order to further explain the important role of the slot array loaded on the radiating metal patch in improving the isolation between the antennas; firstly, the simulation analysis of the structure of the seamless array loading microstrip MIMO antenna with the same structure and spatial distribution mode is carried out. By adopting a common design, four antennas of the MIMO antenna show the same port reflection characteristic, namely only one resonance frequency point is arranged in a 2.5 GHz-4 GHz band, f is 3.06GHz, the maximum coupling value among unit antennas reaches-12.5 dB in an impedance frequency band range, and the working requirement cannot be met.
Reflection coefficients and transmission coefficients of four microstrip MIMO antenna ports loaded with slot arrays are shown in fig. 5 and fig. 6, the slot arrays loaded with radiating metal patches change resonant frequency points of the antennas, f is 3.38GHz, and compared with unloaded antennas, frequency offset of 0.32GHz is generated, and the frequency offset can be adjusted by impedance matching, and impedance bandwidth of the antennas is 3.0% (3.33 GHz-3.43 GHz). But the more important role of the slot array is to reduce the coupling between the antennas, as shown in fig. 6, the coupling between the unit antennas is less than-20.0 dB in the effective impedance bandwidth range, which basically meets the practical requirement.
From the practical efficiency test results, the four antennas are compactly arranged on the same rectangular dielectric substrate, the antenna unit spacing is only 0.05 x λ -5 mm (λ is the wavelength corresponding to the frequency of 3.38 GHz), but the coupling between the unit antennas is still less than-22 dB, and the practical application requirements are met.
According to the technical scheme, it can be seen that the microstrip MIMO antenna structure and the mobile terminal thereof according to the embodiments of the present invention include four microstrip patch antennas having the same structure and different arrangement directions on a rectangular dielectric substrate, where each microstrip patch antenna includes a feed point, a microstrip patch, and a radiating metal patch loaded with a slot array; adjacent slot arrays of the four microstrip patch antennas are mutually orthogonal in the arrangement direction, and non-adjacent slot arrays are mutually parallel in the arrangement direction; the slot array is loaded in the antenna radiation patch, changes the current distribution on the surface of the antenna radiation patch, realizes the polarization orthogonality of the microstrip patch antenna, and weakens the coupling between the microstrip patch antennas under the condition of not changing the size of the substrate.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A microstrip MIMO antenna structure is characterized by comprising a rectangular dielectric substrate and four microstrip patch antennas which are arranged on the rectangular dielectric substrate, have the same structure and are different in arrangement direction, wherein each microstrip patch antenna comprises a feed point, a microstrip patch and a radiating metal patch loaded with a slot array; the adjacent slot arrays of the four microstrip patch antennas are mutually orthogonal in the arrangement direction, and the non-adjacent slot arrays are mutually parallel in the arrangement direction.
2. The microstrip MIMO antenna structure of claim 1, wherein the radiating metal patch of the microstrip patch antenna and the loading slot array are orthogonal to each other in the array direction, the microstrip patch is attached to one side edge of the rectangular dielectric substrate, one end of the radiating metal patch is coupled to the microstrip patch, and the microstrip patch is provided with the feeding point.
3. The microstrip MIMO antenna structure of claim 2, wherein one end of the radiating metal patch is coupled to the microstrip patch for feeding, and the microstrip patch is provided with the feeding point.
4. The microstrip MIMO antenna structure of claim 1, wherein four microstrip patch antennas are respectively disposed at four vertex angles of the rectangular dielectric substrate, and a distance between adjacent microstrip patch antennas is 5 mm.
5. The microstrip MIMO antenna structure of claim 2, wherein the radiating metal patch and the slot array are at an angle of 45 ° with respect to the side of the rectangular dielectric substrate, respectively, and the metal line widths of the radiating metal patch and the slot array are different.
6. The microstrip MIMO antenna structure of claim 2, wherein the microstrip patches of the four microstrip patch antennas are disposed two by two on the two corresponding sides of the rectangular dielectric substrate, respectively.
7. The microstrip MIMO antenna structure of claim 2, wherein the microstrip patches of the four microstrip patch antennas are respectively disposed on four sides of the rectangular dielectric substrate, and the microstrip patch antennas are disposed perpendicular to each other.
8. The microstrip MIMO antenna structure of claim 1, wherein two sets of the microstrip patch antennas are disposed on the rectangular dielectric substrate, respectively, the two sets of the microstrip patch antennas are disposed on the rectangular dielectric substrate in an isolated manner, and each set of four microstrip patch antennas forms the microstrip MIMO antenna structure.
9. The microstrip MIMO antenna structure of claim 2, wherein two sets of the microstrip patch antennas are disposed on the rectangular dielectric substrate, the two sets of the microstrip patch antennas are disposed on the rectangular dielectric substrate in a mutually isolated manner, the microstrip patches of each set of the four microstrip patch antennas are disposed in four mutually perpendicular directions, respectively, and the microstrip patch antennas are disposed in mutually perpendicular directions.
10. A mobile terminal characterized in that it has the microstrip MIMO antenna structure of any of claims 1-9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811141248.4A CN110970719A (en) | 2018-09-28 | 2018-09-28 | Microstrip MIMO antenna structure and mobile terminal thereof |
| PCT/CN2019/104208 WO2020063274A1 (en) | 2018-09-28 | 2019-09-03 | Microstrip mimo antenna structure and mobile terminal thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811141248.4A CN110970719A (en) | 2018-09-28 | 2018-09-28 | Microstrip MIMO antenna structure and mobile terminal thereof |
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| CN110970719A true CN110970719A (en) | 2020-04-07 |
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| WO2020063274A1 (en) | 2020-04-02 |
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