CN111009722B - An integrated MIMO antenna system - Google Patents
An integrated MIMO antenna system Download PDFInfo
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- CN111009722B CN111009722B CN201911421648.5A CN201911421648A CN111009722B CN 111009722 B CN111009722 B CN 111009722B CN 201911421648 A CN201911421648 A CN 201911421648A CN 111009722 B CN111009722 B CN 111009722B
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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
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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
- H01Q21/00—Antenna arrays or systems
- H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
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Abstract
本发明公开了一种一体式MIMO天线系统，包括接地板、共振导线、连接在共振导线上的第一电感元件，所述共振导线与接地板连接形成环形共振体，所述共振导线的两端区域为强电流区域且电流模式方向相反、中间区域为弱电流区域，所述第一电感元件形成在弱电流区域。实施本发明，将两个天线单元集成到一体结构中，实现了高度集成、高度紧凑、具有高隔离度的MIMO天线系统。该发明可适用于各种无线通信设备中，尤其适用于大规模阵列在终端设备中的应用。
The present invention discloses an integrated MIMO antenna system, including a ground plate, a resonant wire, and a first inductor connected to the resonant wire, wherein the resonant wire is connected to the ground plate to form a ring resonator, the two end regions of the resonant wire are strong current regions with opposite current mode directions, the middle region is a weak current region, and the first inductor is formed in the weak current region. By implementing the present invention, two antenna units are integrated into an integrated structure, realizing a highly integrated, highly compact, and highly isolated MIMO antenna system. The invention can be applied to various wireless communication devices, and is particularly suitable for the application of large-scale arrays in terminal devices.
Description
Technical Field
The invention relates to the technical field of communication antennas, in particular to an integrated MIMO antenna system which can be used for various wireless communication devices.
Background
Antennas have become an integral device in various wireless devices for transmitting and receiving electromagnetic wave signals. The MIMO (Multiple-Input Multiple-Output) technology adopts Multiple antenna devices to transmit and receive simultaneously, which can greatly improve the wireless transmission rate without increasing the transmission power or increasing the operating spectrum, and is one of the core technologies of the fourth-generation mobile communication and the fifth-generation communication systems. To ensure excellent MIMO characteristics, high isolation or low coupling between antennas must be achieved to reduce correlation between antennas. However, due to the limited space of modern wireless devices, the space between antennas is smaller, and signal interference between antennas becomes larger, which seriously affects the performance of the MIMO system. The conventional method relies on enlarging the distance between antennas to achieve high isolation, and it is difficult to integrate more antenna devices into the wireless device, so that the current requirement for high transmission rate transmission cannot be met.
With the layout and popularization of the fifth generation communication system in particular, a large-scale antenna array is becoming a trend, so that the demand for a compact MIMO antenna system is increasing. In the prior art, isolation between antennas is improved mainly by introducing parasitic resonance, introducing a decoupling network, utilizing an orthogonal mode and the like.
On the one hand, the introduction of a new parasitic structure between two antennas is one of the most common methods of improving isolation, and the parasitic structure can generate a coupling route with opposite phases to counteract the original coupling between the antennas, thereby improving the isolation of the antennas. The parasitic structures may be of the type of slots, loops, strips, floating structures, etc. However, this method requires the introduction of an additional structure, occupies a large space, is unfavorable for the miniaturization design of the antenna, and moreover, it is difficult to realize a highly compact MIMO antenna system.
On the other hand, the decoupling network usually adopts a lumped element circuit or a neutral line and other methods to counteract the coupling between the antennas, so that the compact MIMO antenna design can be effectively realized. But this method requires more components or occupies a larger circuit area and is currently only suitable for monopole antennas or inverted-F antennas.
In addition, the antennas are orthogonally placed or an orthogonal current mode is excited, so that a high isolation and compact MIMO antenna system can be well realized without an additional decoupling structure or circuit. However, this method requires a large antenna size, and it is difficult to integrate and miniaturize the MIMO antenna system.
The above-mentioned prior art needs two independent antenna units, and has a large antenna size and a complex down-coupling structure, so that a compact MIMO system cannot be realized, and has a great application limitation.
Thus, there is a need to propose an integrated MIMO antenna system in which two antenna elements are integrated into the same structure, and no additional decoupling structure is required, thereby realizing a MIMO antenna system with a simple structure and high integration.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides an integrated MIMO antenna system, which integrates two antenna units into an integrated structure, and realizes the MIMO antenna system with high integration, high compactness and high isolation. The invention is applicable to various wireless communication devices, in particular to the application of a large-scale array in terminal equipment.
The integrated MIMO antenna system comprises a grounding plate, a resonant wire and a first inductance element connected to the resonant wire, wherein the resonant wire is connected with the grounding plate to form an annular resonant body, two end areas of the resonant wire are strong current areas, current modes are opposite in direction, a middle area is a weak current area, and the first inductance element is formed in the weak current area.
Preferably, the resonant circuit further comprises a first feed and a second feed, one end of the resonant wire is connected with the grounding plate through the first feed, and the other end of the resonant wire is connected with the grounding plate through the second feed.
Preferably, the antenna further comprises a first excitation structure and a second excitation structure, wherein the first excitation structure and the second excitation structure are used for controlling impedance matching of the MIMO antenna system.
Preferably, the device further comprises a third feed and a fourth feed, one end of the first excitation structure is connected with the third feed, the third feed is connected with the grounding plate, the other end of the first excitation structure is connected with the resonance wire or the grounding plate, one end of the second excitation structure is connected with the fourth feed, the fourth feed is connected with the grounding plate, and the other end of the second excitation structure is connected with the resonance wire or the grounding plate.
Preferably, the first excitation structure comprises a first component and the second excitation structure comprises a second component.
Preferably, the resonant wire is further connected with at least one second inductance element, and the second inductance element is located in the high current area of the resonant wire.
Preferably, the inner side and/or the outer side of the resonance conductor is/are also provided with branches.
Preferably, a first branch is provided on the inner side of the resonance wire, and the first branch is formed between the resonance wire and the ground plate and connected with the ground plate.
Preferably, the outer side of the resonant wire is further connected with a second branch and a third branch, the second branch and the third branch are respectively formed in the high-current areas at two ends of the resonant wire, one end of the second branch is connected with the resonant wire, the other end of the second branch is opened or connected with the grounding plate through a third component, one end of the third branch is connected with the resonant wire, and the other end of the third branch is opened or connected with the grounding plate through a fourth component.
Preferably, the ground plate further comprises a clearance area, the clearance area is a groove hollowed out by the side edge of the ground plate, and the resonance conducting wire is configured on one side of an opening of the clearance area.
The invention has the following advantages:
1) Unlike the prior art, the invention proposes an integrated MIMO antenna system integrating two antenna elements into the same structure, without any decoupling structure;
2) The invention realizes a highly compact MIMO antenna system, has an integrated structure while realizing high isolation and low correlation, and has more compact antenna size.
Drawings
Fig. 1a is a schematic structural diagram of a first embodiment of an integrated MIMO antenna system according to an embodiment of the present invention.
Fig. 1b is a schematic structural diagram of a second embodiment of an integrated MIMO antenna system according to an embodiment of the present invention.
Fig. 1c is a schematic diagram of current distribution of an integrated MIMO antenna system according to the present invention.
Fig. 2a is a schematic structural diagram of a first embodiment of an integrated MIMO antenna system according to a second embodiment of the present invention.
Fig. 2b is a schematic structural diagram of a second embodiment of an integrated MIMO antenna system according to the second embodiment of the present invention.
Fig. 3a shows a schematic diagram of another embodiment (example 1) of the integrated MIMO antenna system of the present invention.
Fig. 3b shows a schematic diagram of another embodiment (example 2) of the integrated MIMO antenna system of the present invention.
Fig. 3c shows a schematic diagram of another embodiment (example 3) of the integrated MIMO antenna system of the present invention.
Fig. 3d shows a schematic diagram of another embodiment (example 4) of the integrated MIMO antenna system of the present invention.
Fig. 4a is a schematic structural diagram of a first embodiment of an integrated MIMO antenna system according to a third embodiment of the present invention.
Fig. 4b is a schematic structural diagram of a second embodiment of an integrated MIMO antenna system according to the third embodiment of the present invention.
Fig. 5 shows an S-parameter diagram of an integrated MIMO antenna system in a single frequency mode according to the present invention.
Fig. 6 shows an S-parameter diagram of an integrated MIMO antenna system in a dual-band mode according to the present invention.
Detailed Description
The present invention is described in detail below with reference to the drawings and the embodiments, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar components or components having the same or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", or a third "may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or in communication or in interaction with two components. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Through further researching the coupling principle of the MIMO antenna, the invention provides a simple and efficient coupling-down method, thereby forming an integrated MIMO antenna system and having wider application prospect.
Example 1
Fig. 1 shows a schematic structural diagram of an integrated MIMO antenna system according to a first embodiment of the present invention.
As shown in fig. 1a, the integrated MIMO antenna system includes a ground plate 102, a first feed 110a, a second feed 110b, a resonant wire 120, and a first inductive element 121 connected to the resonant wire 120.
The resonant wire 120 is disposed outside the ground plate 102, one end is connected to the first power supply 110a for direct power supply, the other end is connected to the second power supply 110b for direct power supply, and the first power supply 110a and the second power supply 110b are respectively connected to the ground plate 102. The resonance wire 120 has a high current region at both end regions and a low current region in the middle region, and the first inductance element 121 is formed in the low current region. The ground plate 102 is laid on a printed circuit board. The resonant wire 120 and the ground plate 102 together form a loop resonator, which is a resonant loop of the integrated MIMO antenna system and has a length of about one half wavelength. The first inductance element 121 is connected to the middle region of the resonant wire 120 to adjust the higher order mode of the resonant wire 120, which can effectively improve the isolation between the high current regions at the two ends of the resonant wire 120. More preferably, the first inductance element 121 is formed at or near the middle position of the resonance wire 120, but is not limited thereto.
Fig. 1b shows a modification of the first embodiment of the present invention.
As shown in fig. 1b, the integrated MIMO antenna system includes a ground plate 102, a third feed 110c, a first excitation structure 111a, a fourth feed 110d, a second excitation structure 111b, a resonant wire 120, and a first inductive element 121 connected to the resonant wire 120.
The resonant wire 120 is disposed outside the ground plate 102, both ends may be directly connected to the ground plate 102, or one end of the resonant wire 120 may be connected to the ground plate through the first power supply 110a and the other end of the resonant wire 120 may be connected to the ground plate through the second power supply 110b, both end regions of the resonant wire 120 are strong current regions, a middle region is weak current regions, and the first inductance element 121 is formed in the middle weak current region. The resonant wire 120 and the ground plate 102 together form a loop resonator, which is a resonant loop of the integrated MIMO antenna system and has a length of about one half wavelength.
The first excitation structure 111a is formed in a strong current region at one end of the resonant wire 120, one end of the first excitation structure 111a is connected to the third power supply 110c, the other end of the first excitation structure 111a is connected to the resonant wire 120, and the third power supply 110c is connected to the ground plate 102. The first excitation structure 111a includes a first component 112a, where the first component 112a may be a conductive line, an inductive element, or a capacitive element. The second excitation structure 111b is formed in the other end high current region of the resonant wire 120, one end of the second excitation structure 111b is connected to the fourth power supply 110d, the other end of the second excitation structure 111b is connected to the resonant wire 120, and the fourth power supply 110d is connected to the ground plate 102. The second excitation structure 111b includes a second component 112b, where the second component 112b may be a wire, an inductive element, or a capacitive element. The first excitation structure 111a and the second excitation structure 111b serve as excitation loops of the integral MIMO antenna system, controlling impedance matching of the integral MIMO antenna system. The first inductance element 121 is used for adjusting a higher order mode of the resonant wire 120, and the higher order mode can effectively improve isolation of the high current regions at two ends of the resonant wire 120.
According to an embodiment of the present invention, the inductance element has an inductance component, and may be a lumped element, such as a chip inductor, a chip resistor, or the like, or a distributed element, such as a wire, a coil, or the like. The inductance element may be formed of a single inductance element or may be formed by connecting a plurality of inductance elements to each other.
According to an embodiment of the present invention, the capacitive element has a capacitive component, and may be a lumped element, such as a chip capacitor, a varactor, a transistor, etc., or a distributed element, such as a parallel wire, a transmission line, etc. The capacitor element may be formed of a single capacitor element or may be formed by connecting a plurality of capacitor elements to each other. To obtain a certain capacitance, a combination of elements may be used instead of the capacitive element, for example, the capacitive element may be replaced by a combination of capacitive and inductive elements.
Fig. 1c is a schematic diagram of current distribution of an integrated MIMO antenna system according to the present invention to explain the working principle of the present invention.
As shown in fig. 1c, a strong current distribution is generated at both end regions of the resonant wire 120 and the current mode is opposite in direction, and a weak current distribution is generated at the middle region of the resonant wire 120. Thus, the current length of the resonant wire 120 in the present invention is about one-half wavelength to generate antenna resonance. The first inductance element 121 is located in a weak current region of the resonant wire 120, and thus the first inductance element 121 does not affect the resonant frequency of the antenna, and only changes the resonant frequency of the higher order mode. Thus, the first inductance element 121 in the present invention can control the higher order mode, which can effectively improve the isolation between the high current areas at both ends of the resonant wire 120, thereby realizing an integrated MIMO antenna system.
Example two
Fig. 2 is a schematic structural diagram of an integrated MIMO antenna system according to a second embodiment of the present invention.
As shown in fig. 2a, the integrated MIMO antenna system includes a ground plate 102, a first feed 210a, a second feed 210b, a resonant wire 220, and a first inductive element 221 connected to the resonant wire 220.
The resonant wire 220 is disposed outside the ground plate 102, one end is connected to the first power supply 210a for direct power supply, and the other end is connected to the second power supply 210b for direct power supply, and the first power supply 210a and the second power supply 210b are respectively connected to the ground plate 102 and formed in a middle region of the resonant wire 120, i.e. the first power supply 210a and the second power supply 210b are disposed adjacent to each other. The resonance wire 220 has a high current region at both end regions and a low current region at the middle region, and the first inductance element 221 is formed in the low current region. The resonant wire 220 and the ground plate 102 together form a loop resonator, which is a resonant loop of the integrated MIMO antenna system and has a length of about one-half wavelength. The first inductance element 221 is connected to the middle region of the resonant wire 220, so as to adjust the higher order mode of the resonant wire 220, so as to improve the isolation between the high current regions at the two ends of the resonant wire 120.
Fig. 2b shows a modification of the second embodiment of the present invention.
As shown in fig. 2b, the integrated MIMO antenna system includes a ground plate 102, a third feed 210c, a first excitation structure 211a, a fourth feed 210d, a second excitation structure 211b, a resonant wire 220, and a first inductive element 221 connected to the resonant wire 220.
The resonant wire 220 is disposed on the outside of the ground plate, both ends of the resonant wire 220 are directly connected to the ground plate 102, and both ends of the resonant wire 220 are disposed adjacent to each other, the two end regions of the resonant wire 120 are a strong current region, the middle region is a weak current region, and the first inductance element 221 is formed in the weak current region. The resonant wire 220 and the ground plate 102 together form a ring resonator.
The first excitation structure 211a is formed in a high current region of a ground terminal of the resonant wire 220, one end is connected to the third power supply 210c, the other end is connected to the resonant wire 220, and the third power supply 210c is connected to the ground plate 102. The first excitation structure 211a includes a first component 212a, where the first component 212a may be a conductive line, an inductive element, or a capacitive element. The second excitation structure 211b is formed in a high current region at the other ground end of the resonant wire 220, one end is connected to the fourth power supply 210d, the other end is connected to the resonant wire 220, and the fourth power supply 210d is connected to the ground plate 102. The second excitation structure 211b includes a second component 212b, and the second component 212b may be a conductive wire, an inductive element, or a capacitive element. The first excitation structure 211a and the second excitation structure 211b serve as excitation loops of the integral MIMO antenna system, controlling impedance matching of the integral MIMO antenna system.
It should be understood by those skilled in the art that the high current areas at the two ends of the resonant wire 220 may be symmetrically disposed or asymmetrically disposed, preferably symmetrically disposed, the structures of the first excitation structure 211a and the second excitation structure 211b may be symmetrically disposed or asymmetrically disposed, preferably symmetrically disposed, the excitation structures 211a and the second excitation structure 211b may be formed in the high current area or the low current area at the same time, or may be formed in the high current area and the low current area respectively, and the structures of the first excitation structure 211a and the second excitation structure 211b may be the same or different, preferably the same structure.
Fig. 3 shows a schematic diagram of another embodiment of the integrated MIMO antenna system of the present invention.
As shown in fig. 3, the integrated MIMO antenna system includes a ground plate 102, a first feed 410a, a second feed 410b, a resonant wire 420, and a first inductive element 421 connected to the resonant wire 420. The resonant wire 420 has a high current region at both end regions and a low current region in the middle region, and the first inductance element 421 is formed in the low current region.
As shown in fig. 3a, and in combination with fig. 1c, at least one second inductance element (two second inductance elements 422a,422b are shown in the drawing) is connected to the resonant wire 420, and the second inductance element is located in a strong current region of the resonant wire 420, so that the length of the resonant wire 420 can be effectively reduced, and miniaturization of the antenna can be achieved. The other circuit structure is the same as in fig. 1 a. The second inductance element may be one or more, or may be asymmetrically arranged, preferably symmetrically arranged.
In the embodiment of the present invention, the inner side and/or the outer side of the resonant wire 420 is further provided with a branch, and the branch can increase the capacitance component of the resonant wire 420, so as to effectively reduce the length of the resonant wire 420, thereby realizing miniaturization of the antenna.
Specifically, as shown in fig. 3b, the integrated MIMO antenna system further includes a first branch 423, where the first branch 423 is formed between the resonant wire 420 and the ground plate 102 and is connected to the ground plate 102 (i.e., inside the resonant wire 420), so that the capacitance component of the resonant wire 420 can be increased, and then the length of the resonant wire 420 can be effectively reduced, so as to achieve miniaturization of the antenna. The other circuit structure is the same as in fig. 1 a.
As shown in fig. 3c, a second branch 424a and a third branch 424b are further connected to both sides of the outer side of the resonant wire 420, respectively, and the second branch 424a and the third branch 424b are formed in a high current area of the resonant wire 420. Preferably, the second branch 424a and the third branch 424b are connected to the resonance wire 420 at their uniform ends, and are open at the other ends. The resonant wire 420 connected to the second branch 424a and the third branch 424b may generate two resonances, constituting a dual-frequency MIMO antenna. The other circuit structure is the same as in fig. 1 a. The second branch 424a and the third branch 424b may be symmetrically disposed, or may be asymmetrically disposed, preferably symmetrically disposed.
As shown in fig. 3d, a second branch 424a and a third branch 424b are connected to the outer side of the resonant wire 420, respectively, and the second branch 424a and the third branch 424b are formed in a high current region of the resonant wire 420. One end of the second branch 424a is connected to the resonant wire 420, and the other end is electrically connected to the ground plate 102 through the third component 425 a. The third component 425a is a wire, an inductive element, or a capacitive element. The third branch 424b has one end connected to the resonant wire 420 and the other end electrically connected to the ground plane 102 via the fourth element 425 b. The fourth component 425b is a wire, an inductive element, or a capacitive element. The resonant wire 420 connected to the second branch 424a and the third branch 424b may generate two resonances, constituting a dual-frequency MIMO antenna. The other circuit structure is the same as in fig. 1 a.
Example III
Fig. 4 is a schematic structural diagram of an integrated MIMO antenna system according to a third embodiment of the present invention.
As shown in fig. 4a, the integrated MIMO antenna system includes a ground plate 102, a headroom region 304, a first feed 310a, a second feed 310b, a resonant wire 320, and a first inductive element 321 connected to the resonant wire 320. The clearance area 304 is a recess hollowed out in the side of the ground plate 102.
The resonant wire 320 is disposed at one side of the opening of the clearance area 304, one end is connected to the first power supply 310a to directly supply power, the other end is connected to the second power supply 310b to directly supply power, the first power supply 310a and the second power supply 310b are respectively connected to the ground plate 102, two end regions of the resonant wire 320 are strong current regions, a middle region is weak current regions, and the first inductance element 321 is formed in the weak current regions. The resonant wire 320 and the ground plate 102 together form a loop resonator, which is a resonant loop of the integrated MIMO antenna system and has a length of about one-half wavelength. The middle region of the resonant wire 320 is connected with a first inductance element 321 for adjusting a higher order mode of the resonant wire 320, which can effectively improve the high isolation between the high current regions at the two ends of the resonant wire 120.
Fig. 4b shows a modification of the third embodiment of the present invention.
As shown in fig. 4b, the integrated MIMO antenna system includes the ground plate 102, the headroom region 304, the third feed 310c, the first excitation structure 311a, the fourth feed 310d, the second excitation structure 311b, the resonant wire 320, and the first inductive element 321 connected to the resonant wire 320.
The resonant wire 320 is disposed at the opening side of the clearance area 304, and both ends of the resonant wire 320 are directly connected to the ground plate 102, the two end regions of the resonant wire 320 are strong current regions, the middle region is a weak current region, and the first inductance element 321 is formed in the weak current region. The resonant wire 320 and the ground plate 102 together form a ring resonator.
The first excitation structure 311a is formed in the clearance area and in a strong current region at one end of the resonant wire 320, one end is connected to the third power feed 310c, the other end is connected to the ground plate 102, and the third power feed 310c is connected to the ground plate 102. The first excitation structure 311a includes a first component 312a, where the first component 312a may be a conductive wire, an inductive element, or a capacitive element. The second excitation structure 311b is also formed in the headroom region and in the other end high current region of the resonant wire 320, with one end connected to the fourth power feed 310d and the other end connected to the ground plate 102, and the fourth power feed 310d connected to the ground plate 102. The second excitation structure 311b includes a second component 312b, where the second component 312b may be a conductive wire, an inductive element, or a capacitive element. The first excitation structure 311a and the second excitation structure 311b serve as excitation loops of the integral MIMO antenna system, and control impedance matching of the integral MIMO antenna system. The first inductance element 321 is used for adjusting a higher order mode of the resonant wire 320, which can effectively improve the isolation between the high current areas at two ends of the resonant wire 120.
According to the above-described embodiments of the present invention, it should be understood that the excitation structure of the present invention may have different manifestations according to the type, location, connection manner, etc., and any excitation loop of conventional structure in the prior art may be used to feed the antenna, and thus the specific structure, type, connection manner, etc. of the excitation loop are not particularly limited by the present invention, and the excitation structure in all the drawings of the embodiments of the present invention is merely an example.
In the foregoing embodiments of the present invention, it should be understood by those skilled in the art that the resonant structure, the excitation structure, the branches and the ground plate may be disposed in the same plane, or may be disposed in different planes, and the embodiments of the present invention are illustrated in the same plane in all the drawings, and should not be limited thereto.
Fig. 5 shows an S-parameter diagram of an integrated MIMO antenna system in a single frequency mode according to the present invention.
As shown in fig. 5, the first curve 5a is the reflection coefficient generated by the first antenna, and the second curve 5b is the reflection coefficient generated by the second antenna. The center frequency of both antennas is around 3.5GHz, and has broadband characteristics. The third curve 5c is a reverse transmission coefficient between the two antennas, and represents the coupling degree between the antennas, and it can be known that the third curve 5c generates a coupling peak-valley in the operating frequency band, so that a high isolation degree (more than 15 dB) between the antennas can be ensured. In addition, the radiation efficiency of the integrated MIMO antenna is more than 80%, and the correlation (ECC) obtained in simulation is lower than 0.1. Therefore, the integrated MIMO antenna system has the characteristics of high isolation, good radiation performance, low correlation and the like, and is suitable for the application of the MIMO system.
Fig. 6 shows an S-parameter diagram of an integrated MIMO antenna system in a dual-band mode according to the present invention.
Referring to fig. 4, it can be seen that the integrated MIMO antenna system of the present invention can generate one or more resonances to achieve high isolation in a single band or multiple bands. As shown in fig. 6, the first curve 6a and the second curve 6b are reflection coefficients generated by the first antenna and the second antenna, respectively. The two antennas resonate simultaneously in both the 3.5GHz and 5.5GHz frequency bands. The third curve 6c is the reverse transmission coefficient between antennas, representing the coupling degree between antennas, and it can be known that the isolation degree in both frequency bands is above 10 dB. Therefore, the decoupling technology in the invention is also suitable for the integrated MIMO antenna system in the multi-band mode.
In summary, compared with the prior art, the above embodiment has the following characteristics:
1) The invention realizes a highly compact MIMO antenna system, has an integrated structure while realizing high isolation and low correlation, has more compact antenna size and has wide application prospect.
2) The integrated MIMO antenna system of the present invention is applicable not only to single frequency bands but also to multiple frequency bands.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention in any way, and it should be noted that modifications and alterations will be apparent to those skilled in the art without departing from the principles of the invention, and it is intended to cover the invention in its broader aspects.
Claims (5)
1. The integrated MIMO antenna system is characterized by comprising a grounding plate, a resonance wire and a first inductance element connected to the resonance wire, wherein the resonance wire is connected with the grounding plate to form a ring-shaped resonance body, two end areas of the resonance wire are strong current areas, the current modes are opposite in direction, the middle area is a weak current area, and the first inductance element is formed in the weak current area;
The integrated MIMO antenna system further comprises a first feed and a second feed, one end of the resonance wire is connected with the grounding plate through the first feed, and the other end of the resonance wire is connected with the grounding plate through the second feed; the integrated MIMO antenna system further comprises a first excitation structure, a second excitation structure, a third feed and a fourth feed, wherein one end of the first excitation structure is connected with the third feed, the third feed is connected with a grounding plate, the other end of the first excitation structure is connected with a resonance wire or the grounding plate, one end of the second excitation structure is connected with the fourth feed, the fourth feed is connected with the grounding plate, the other end of the second excitation structure is connected with the resonance wire or the grounding plate, the first excitation structure comprises a first component, the second excitation structure comprises a second component, and the first excitation structure and the second excitation structure are used for controlling impedance matching of the MIMO antenna system;
The resonance wire is characterized in that a first branch is arranged on the inner side of the resonance wire, the first branch is formed between the resonance wire and the grounding plate and is connected with the grounding plate, or a second branch and a third branch are respectively connected on the outer side of the resonance wire, the second branch and the third branch are respectively formed in the high-current areas at the two ends of the resonance wire, one end of the second branch is connected with the resonance wire, the other end of the second branch is opened or is connected with the grounding plate through a third component, one end of the third branch is connected with the resonance wire, and the other end of the third branch is opened or is connected with the grounding plate through a fourth component;
the antenna resonates in two frequency bands of 3.5GHz and 5.5GHz, and the isolation in the two frequency bands is more than 10 dB.
2. The integrated MIMO antenna system of claim 1 wherein at least one second inductive element is further connected to said resonant wire, said second inductive element being located within the high current region of the resonant wire.
3. The integrated MIMO antenna system of claim 1, wherein the first component and the second component are conductive wires, inductive elements, or capacitive elements.
4. The integrated MIMO antenna system of claim 1 wherein said third and fourth elements are conductive wires, inductive elements or capacitive elements.
5. The integrated MIMO antenna system of any one of claims 1-4, wherein the ground plate further comprises a clear space, the clear space being a recess hollowed out from a side of the ground plate, the resonant wire being disposed on an open side of the clear space.
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| CN111370869A (en) * | 2020-04-21 | 2020-07-03 | 曲龙跃 | A compact MIMO antenna system based on a suspended annular decoupling structure |
| CN111463571A (en) * | 2020-04-21 | 2020-07-28 | 曲龙跃 | Self-decoupling MIMO antenna system based on orthogonal current mode |
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| CN115882218B (en) * | 2021-09-29 | 2025-12-12 | 荣耀终端股份有限公司 | A high-isolation terminal antenna system |
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