CN210984955U

CN210984955U - Self-decoupling MIMO antenna system

Info

Publication number: CN210984955U
Application number: CN202020034378.4U
Authority: CN
Inventors: 曲龙跃; 朴海燕
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-01-08
Filing date: 2020-01-08
Publication date: 2020-07-10
Anticipated expiration: 2030-01-08

Abstract

The utility model discloses a self-decoupling MIMO antenna system, which comprises a ground plate, a ground radiation antenna and a loop antenna, wherein the ground radiation antenna and the loop antenna are connected with the ground plate; the ground radiation antenna is arranged adjacent to or electrically connected with the loop antenna and is formed in the middle area of the loop antenna. Implement the utility model discloses a self-decoupling MIMO antenna system need not any coupling structure and circuit that falls, therefore the structure is simpler, and the cost is lower, when realizing high isolation and low correlation, has advantages such as compact structure, unit size are little, the unit interval is close.

Description

Self-decoupling MIMO antenna system

Technical Field

The invention relates to the technical field of communication antennas, in particular to a self-decoupling MIMO antenna system.

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 employs Multiple antenna devices to transmit and receive simultaneously, which can greatly improve the wireless transmission rate without increasing the transmission power or increasing the working frequency spectrum, and is one of the core technologies of fourth-generation mobile communication and fifth-generation communication systems. To ensure excellent MIMO characteristics, high isolation or low coupling between antennas must be achieved to reduce the degree of correlation between antennas. However, due to the limited space of modern wireless devices, the antenna spacing is small, and the signal interference between antennas is large, which seriously affects the performance of the MIMO system. The traditional method realizes high isolation by enlarging the distance between the antennas, and is difficult to integrate more antenna devices into the wireless equipment, so that the current requirement on high transmission rate transmission cannot be met.

Especially with the layout and popularization of fifth generation communication systems, large-scale antenna arrays are becoming a trend, and thus the demand for compact MIMO antenna systems is increasing. In the prior art, the isolation between the antennas is improved mainly by introducing parasitic resonance, introducing a decoupling network, utilizing an orthogonal mode and the like.

On the one hand, introducing a new parasitic structure between two antennas is one of the most common methods for improving isolation, and the parasitic structure can generate a coupling route with opposite phases to cancel the original coupling between the antennas, thereby improving the antenna isolation. The parasitic structures may be of the slot, loop, strip, suspended structure, etc. However, this method requires an additional structural body, occupies a large space, and is not favorable for the miniaturization design of the antenna.

On the other hand, the decoupling network usually adopts methods such as lumped element circuits or neutral lines to counteract the coupling between the antennas, so as to effectively realize the design of the compact MIMO antenna. However, 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 arranged 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 achieve integration and miniaturization of the MIMO antenna system.

The above-mentioned prior art either fails to realize a compact MIMO system, or has a more complicated decoupling structure, or has a great application limitation, or has a larger antenna size.

Therefore, there is a need to provide a MIMO antenna system with a simple structure, which does not need any decoupling structure or circuit, realizes a highly integrated, highly compact, and highly isolated MIMO antenna system, avoids time-consuming individual analysis and debugging in the conventional method, saves cost, and reduces development cycle.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides a self-decoupling MIMO antenna system, which does not need any decoupling structure and circuit, has the characteristics of compact antenna structure, small antenna unit size, close unit spacing and the like, and realizes the MIMO antenna system with high integration, high compactness and high isolation. The invention can be applied to various wireless communication devices, and is particularly suitable for application of large-scale arrays in terminal equipment.

The technical effect to be achieved by the invention is realized by the following scheme: a self-decoupling MIMO antenna system comprises a ground plate, a ground radiation antenna and a loop antenna, wherein the ground radiation antenna and the loop antenna are connected with the ground plate; the ground radiation antenna is arranged adjacent to or electrically connected with the loop antenna and is formed in the middle area of the loop antenna.

Preferably, the ground radiation antenna includes a first clearance area, a first feed, a first excitation wire and a first resonant wire, the first clearance area is an area hollowed out of the ground plate, the first excitation wire is disposed in the first clearance area, and the first excitation wire includes a first component; the first resonant lead is configured at one side of the opening of the first clearance area and comprises a first capacitance element.

Preferably, the loop antenna is configured at the outer side of the ground plate, and includes a second feed, a second excitation wire and a second resonance wire, and both ends of the second resonance wire are connected to the ground plate; the second excitation wire includes a second component.

Preferably, the loop antenna is disposed on an inner side of the ground plate, and includes a second clearance area, a second feed line, and a second excitation wire, where the second clearance area is a hollowed area on the ground plate, the second excitation wire is disposed in the second clearance area, and the second excitation wire includes a second component.

Preferably, a first branch is further connected in the first clearance area, and two ends of the first branch are respectively connected with the ground plate; the first branch includes a third component.

Preferably, a first branch is further connected in the first clearance area, one end of the first branch is connected with the first resonant conductor, and the other end of the first branch is connected with the ground plate.

Preferably, the middle region of the second resonance wire is further connected with a fourth component.

Preferably, the second resonant conductor is further connected to a first inductance element.

Preferably, a second branch is further connected within the second resonant conductor, the second branch including a fifth element.

The invention has the following advantages:

1) Different from the prior art, the self-decoupling MIMO antenna system does not need any decoupling structure and circuit, so the self-decoupling MIMO antenna system has simpler structure, lower cost and wider application prospect.

2) The invention realizes a highly compact MIMO antenna system, and has the characteristics of compact structure, small unit size, close unit spacing and the like while realizing high isolation and low correlation.

Drawings

Fig. 1a is a schematic structural diagram of a first specific implementation of a self-decoupling MIMO antenna system according to a first embodiment of the present invention;

Fig. 1b is a schematic current distribution diagram of the self-decoupling MIMO antenna system of the present invention;

Fig. 1c is a schematic structural diagram of a second specific implementation of a self-decoupling MIMO antenna system according to a first embodiment of the present invention;

Fig. 2a is a schematic structural diagram of a first specific implementation of a self-decoupling MIMO antenna system according to a second embodiment of the present invention;

Fig. 2b is a schematic structural diagram of a second specific implementation of a self-decoupling MIMO antenna system according to a second embodiment of the present invention;

Fig. 3a shows a schematic diagram of a further embodiment (example 1) of the ground radiating antenna in the self-decoupling MIMO antenna system of the present invention;

Fig. 3b shows a schematic diagram of a further embodiment (example 2) of the ground radiating antenna in the self-decoupling MIMO antenna system of the present invention;

Figure 3c shows a schematic diagram of a further embodiment (example 3) of the ground radiating antenna in the self-decoupling MIMO antenna system of the present invention;

Fig. 3d shows a schematic diagram of a further embodiment (example 4) of the ground radiating antenna in the self-decoupling MIMO antenna system of the present invention;

Figure 4a shows a schematic diagram of a further embodiment (example 1) of a loop antenna in the self-decoupling MIMO antenna system of the present invention;

Figure 4b shows a schematic diagram of a further embodiment (example 2) of a loop antenna in the self-decoupling MIMO antenna system of the present invention;

Figure 4c shows a schematic diagram of a further embodiment (example 3) of a loop antenna in the self-decoupling MIMO antenna system of the present invention;

Figure 4d shows a schematic diagram of a further embodiment (example 4) of a loop antenna in the self-decoupling MIMO antenna system of the present invention;

Figure 4e shows a schematic diagram of a further embodiment (example 5) of a loop antenna in the self-decoupling MIMO antenna system of the present invention;

Figure 4f shows a schematic diagram of a further embodiment (example 6) of a loop antenna in the self-decoupling MIMO antenna system of the present invention;

Fig. 5 shows a diagram of S parameters of a self-decoupling MIMO antenna system in a single frequency mode according to the present invention;

Fig. 6 shows a diagram of S parameters of a self-decoupling MIMO antenna system in a dual-frequency mode according to the present invention.

Detailed Description

The invention is described in detail below with reference to the drawings, wherein examples of the embodiments are shown in the drawings, wherein like or similar reference numerals refer to like or similar components or components having like or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or components must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner and are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other or mutually interacted. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

By deeply researching the coupling principle of the MIMO antenna, the invention provides the self-decoupling MIMO antenna system, which can form a highly compact MIMO antenna system without any structural structure or circuit and has wider application prospect.

Example one

Fig. 1 shows a schematic structural diagram of a self-decoupling MIMO antenna system according to a first embodiment of the present invention.

As shown in fig. 1a, a self-decoupling MIMO antenna system includes a ground plate 102, a ground radiating antenna 110 disposed at a side of the ground plate 102, and a loop antenna 120 disposed outside the ground plate 102. The ground radiation antenna 110 is located in the middle region of the loop antenna 120, and the open side thereof is surrounded by the loop antenna 120.

The ground radiating antenna 110 includes a first clearance area 104, a first feed 111, a first excitation wire 112, and a first resonant wire 114. The first clearance area 104 is a groove hollowed out from the side of the ground plate 102. The ground plate 102 is laid on the printed circuit board.

The first excitation wire 112 is disposed in the first clearance area 104, and has one end connected to the first power feed 111 and the other end connected to the ground plate 102, where the first power feed 111 is connected to the ground plate 102. The first excitation wire 112 comprises a first component 113, and the first component 113 may be a wire, an inductive element or a capacitive element. The first excitation wire 112 serves as an excitation loop for the ground radiating antenna 110 for feeding a radio frequency signal and controlling the impedance matching of the antenna, and couples the RF signal in the first feed 111 to the first resonant wire 114. The first excitation wire 112 may have different expressions according to the number, position, connection manner, etc., and the antenna may be fed by any excitation loop having a conventional structure in the prior art, and thus, the present invention does not specifically limit the specific structure, type, connection manner, etc. of the first excitation wire 112.

The first resonant conductive line 114 is disposed at an opening side of the first clearance area 104, and both ends of the first resonant conductive line are connected to the ground plate 102. The first resonant conductive line 114 includes a first capacitive element 115. The first resonant conductor 114 may form a resonator surrounding the clearance area with the first clearance area 104, generate antenna resonance, and couple RF energy to the ground plane 102 for radiation with the ground plane 102 as part of the antenna. The first capacitive element 115 can thus be used to easily control the resonant frequency of the antenna. It should be understood that the number of the first resonant conductive lines 114 may be one or more, and the embodiment of the present invention only illustrates one, but should not be taken as a limitation.

The loop antenna 120 is disposed outside the ground plate 102, and includes a second power feed 121, a second excitation wire 122, and a second resonance wire 124.

The second excitation wire 122 has one end connected to the second power feed 121 and the other end connected to the second resonant wire 124, and the second power feed 121 is connected to the ground plate 102. The second excitation wire 122 comprises a second component 123, said second component 123 may be a wire, an inductive element or a capacitive element. The second excitation wire 122 serves as an excitation loop for the loop antenna 120 for feeding a radio frequency signal and controlling the impedance matching of the antenna, and couples the RF signal in the second feed 121 to the second resonance wire 124. The second excitation wire 122 may have different expressions according to the number, position, connection manner, etc., and the antenna may be fed by any excitation loop having a conventional structure in the prior art, and thus, the present invention does not specifically limit the specific structure, type, connection manner, etc. of the second excitation wire 122.

Both ends of the second resonant conductive line 124 are connected to the ground plate 102, and form a ring resonator together with the ground plate 102. Both ends of the second resonant wire 124 are connected to the ground plane 102 at both sides of the ground radiation antenna 110 to cover the ground radiation antenna 110, and the ground radiation antenna 110 is disposed in the middle region of the loop antenna 120, i.e., the ground radiation antenna 110 is located in the middle region of the second resonant wire 124. The second resonant wire 124 acts as a resonant loop for the loop antenna 110, with a current length of about half a wavelength, creating antenna resonance and controlling antenna frequency. It should be understood that the number of the second resonant wires 124 may be one or more, and the embodiment of the present invention only illustrates one, but should not be taken as a limitation.

According to the embodiments of the present invention, the capacitive element has a capacitance 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 conductive line, a transmission line, etc. In addition, the capacitor element may be formed by a single capacitor element or may be formed by connecting a plurality of capacitor elements to each other. In order to obtain a certain capacitance, a combination of a plurality of elements may be used instead of the capacitive element, for example, the capacitive element may be replaced by a combined structure of a capacitive element and an inductive element.

According to the 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. Also, the inductance element may be constituted by a single inductance element or may be constituted by a plurality of inductance elements connected to each other.

Fig. 1b is a schematic current distribution diagram of the self-decoupling MIMO antenna system in the present invention, so as to explain the working principle of self-decoupling in the present invention.

As shown in fig. 1b, and in conjunction with fig. 1a, the loop antenna 120 and the ground plate 102 form a loop resonator, generating a loop current mode distributed along the second resonant conductive line 124. The loop current pattern produces a strong current distribution in the two end regions of the loop antenna 120 and the current pattern is reversed, producing a weak current distribution in the middle region of the loop antenna 120. By disposing the ground radiating antenna 110 in the weak current region of the loop antenna 110, a self-decoupling effect can be generated between the two antennas, so as to form a compact self-decoupling MIMO antenna system with high isolation, thereby simplifying the antenna structure and simplifying the transceiver circuit of the MIMO system.

Fig. 1c shows a modified structure of the first embodiment of the present invention.

As shown in fig. 1c, a self-decoupling MIMO antenna system includes a ground plate 102, a ground radiating antenna 110 disposed at a side of the ground plate 102, and a loop antenna 120 disposed outside the ground plate 102. The ground radiation antenna 110 is disposed in the middle region of the loop antenna 120, and the first capacitor element 115 on the opening side thereof is surrounded by the loop antenna 120.

The circuit structure of the ground radiating antenna 110 is the same as in fig. 1 a.

The second excitation wire 122 has one end connected to the second power feed 121 and one end connected to the second resonant wire 124, and the second power feed 121 is connected to the ground plate 102. The second excitation wire 122 comprises a second component 123, said second component 123 may be a wire, an inductive element or a capacitive element. The second excitation wire 122 serves as an excitation loop for the loop antenna 120 for feeding a radio frequency signal and controlling the impedance matching of the antenna, and couples the RF signal in the second feed 121 to the second resonance wire 124.

Both ends of the second resonance wire 124 in the loop antenna 120 are connected to the first resonance wire 114 in the ground radiation antenna 110 and to both ends of the first capacitance element 115. Therefore, the second resonant conductive line 124 is electrically connected to the ground plate 102 through the first resonant conductive line 114, and forms a ring resonator together with the ground plate 102. The second resonant wire 124 acts as a resonant loop for the loop antenna 110, with a current length of about half a wavelength, creating antenna resonance and controlling antenna frequency.

Example two

Fig. 2 is a schematic diagram of a self-decoupling MIMO antenna system according to a second embodiment of the present invention.

As shown in fig. 2a, a self-decoupling MIMO antenna system includes a ground plate 102, a ground radiating antenna 210 disposed at a side of the ground plate 102, and a loop antenna 220 disposed inside the ground plate 102. The ground radiating antenna 210 is disposed in the middle region of the loop antenna 220, and the distance between the two antennas is small.

The ground radiating antenna 210 includes a first clearance area 204, a first feed 211, a first excitation wire 212, and a first resonant wire 214. The first clearance area 204 is a groove hollowed out from the side of the ground plate 102.

The first excitation wire 212 is disposed in the first clearance area 204, and has one end connected to the first power feed 211 and one end connected to the ground plate 102, where the first power feed 211 is connected to the ground plate 102. The first excitation wire 212 comprises a first component 213, said first component 213 may be a wire, an inductive element or a capacitive element. The first excitation wire 212 serves as an excitation loop for the ground radiating antenna 210 for feeding a radio frequency signal and controlling the impedance matching of the antenna, and couples the RF signal in the first feed 211 to the first resonant wire 214.

The first resonant conductive line 214 is disposed at an opening side of the first clearance area 204, and both ends of the first resonant conductive line are connected to the ground plate 102. The first resonant conductive line 214 includes a first capacitive element 215. The first resonant conductor 214 may utilize the first clearance area 204 to form a resonator surrounding the clearance area, to resonate the antenna, and to couple RF energy to the ground plane 102 for radiation using the ground plane 102 as part of the antenna.

The loop antenna 220 is disposed inside the ground plate 102 and includes a second clearance area 206, a second feed 221, and a second excitation wire 222.

The second excitation wire 222 is disposed in the second clearance 206, and has one end connected to the second power feed 221 and one end connected to the ground plate 102, and the second power feed 221 is connected to the ground plate 102. The second excitation wire 222 comprises a second component 223, said second component 223 may be a wire, an inductive element or a capacitive element. The second excitation wire 222 serves as an excitation loop of the loop antenna 220 and controls the impedance matching of the antenna.

The second clearance 206 is a hollow area inside the ground plate 102, and is surrounded by the ground plate 102, so as to form a ring resonator surrounding the second clearance 206 together with the ground plate 102, and serve as a resonant loop of the loop antenna 220. The current length of the long side of the second clearance area 206 is about half a wavelength, and the length of the long side is the length of the short side, thereby generating antenna resonance and controlling antenna frequency. The second clearance area 206 is located at a small distance from the first clearance area 204, i.e., is disposed adjacent to the first clearance area 204, and the first clearance area 204 is located in the middle of the long side of the second clearance area 206. According to the embodiment of the present invention, the ground radiating antenna 210 is located in the middle area of the loop antenna 220, and the distance between the two is small, so as to form a self-decoupling MIMO antenna system.

Fig. 2b shows a modified structure of the second embodiment of the present invention.

As shown in fig. 2a, a self-decoupling MIMO antenna system includes a ground radiating antenna 210 disposed inside the ground plane 102 and a loop antenna 220 disposed inside the ground plane 102. The ground radiation antenna 210 is located in the middle area of the loop antenna 220, and its open side is surrounded by the loop antenna 220.

The circuit structure of the loop antenna 220 is the same as in fig. 2 a.

The ground radiating antenna 210 includes a first clearance area 204, a first feed 211, a first excitation wire 212, and a first resonant wire 214. The clearance area is a hollowed area inside the ground plate 102, and has an opening at one side, the opening side faces the second clearance area 206, and the rest sides are surrounded by the ground plate 102. The other circuit configuration is the same as in fig. 2 a.

Fig. 3 shows a schematic diagram of another embodiment of the ground radiating antennas in the self-decoupling MIMO antenna system of the present invention.

The exciting wire of the ground radiation antenna may have different expressions according to the number, position, connection mode, etc., and the antenna may be fed by any exciting loop with a conventional structure in the prior art, so that the present invention does not specifically limit the specific structure, type, connection mode, etc. of the exciting wire of the ground radiation antenna. The resonant conductor of the ground radiating antenna and the clearance area together generate an antenna resonance, and thus the first resonant conductor 314 of the ground radiating antenna 310 has various embodiments to achieve the same purpose. As shown in fig. 3a, the first resonant wire 314 may be disposed outside the first clearance area 304, occupying a space outside the clearance area. As shown in fig. 3b, a first branch 316 is connected to the first clearance area 304, and both ends of the first branch 316 are respectively connected to the ground plate 102. The first branch 316 comprises a third component 317, said third component 317 may be a conductive line, an inductive element or a capacitive element. As shown in fig. 3c, the first branch 316 is connected to the first resonant conductor 314 at one end and to the ground plane 102 at the other end. The method may constitute one or more resonators within the first clearance zone 304, which in turn may generate one or more frequency bands. As shown in fig. 3d, the first clearance area 304 may be a hollowed-out area located at one side or two adjacent sides of the ground plate, and two sides are open. Common features of the resonant conductor in the ground radiating antenna 310 are: is disposed on the open side of the first clearance area 304 and includes at least one capacitive element, thereby forming one or more resonators together with the clearance area.

Fig. 4 shows a schematic diagram of another embodiment of a loop antenna in a self-decoupling MIMO antenna system in accordance with the present invention.

As shown in fig. 4a, the loop antenna 420 is directly fed by the second feeding 421, and the second resonant conductive line 424 has one end connected to the second feeding 421 and one end connected to the ground plane 102, and forms a loop resonator together with the ground plane. Meanwhile, in order to realize more complicated functions of miniaturization, multiband, broadband, and the like of the loop antenna, the resonant wire may have various embodiments. As shown in fig. 4b to 4e, the loop antenna 420 includes a second feed 421, a second excitation wire 422, and a second resonance wire 424. As shown in fig. 4b, the middle region of the second resonant conductor 424 may be connected to a fourth component 425, and the fourth component 425 may be a conductor, an inductive element or a capacitive element; as shown in fig. 4c, a first inductance element 426 may be connected to any position of the second resonant conductive line 424; as shown in fig. 4d and 4e, a second branch 427 may be connected within the second resonant conductor 424, said second branch 427 may comprise a fifth element 428. As shown in fig. 4f, the loop antenna 420 also includes a third clearance area 406 disposed at the side of the ground plane. The second resonant conductor 424 of the loop antenna 420 has a common feature of forming at least one loop resonator together with the ground plane.

In the above embodiments of the present invention, it should be understood by those skilled in the art that the ground radiation antenna, the loop antenna and the ground plate may be disposed on the same plane or on different planes. The drawings of the embodiments of the present invention are illustrated in the same plane, and should not be construed as limiting.

Fig. 5 shows a diagram of S parameters of a self-decoupling MIMO antenna system in a single frequency mode according to the present invention.

As shown in fig. 5, a first curve 5a is a reflection coefficient generated by the ground radiation antenna, and a second curve 5b is a reflection coefficient generated by the loop antenna. The center frequencies of the two antennas are both around 3.5GHz, and the two antennas have broadband characteristics. The third curve 5c is a reverse transmission coefficient between the two antennas, and represents a 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 20 dB) between the antennas can be ensured. In addition, the radiation efficiency of the self-decoupling MIMO antenna is over 80%, and the correlation coefficient (ECC) obtained in simulation and test is lower than 0.1. Therefore, the self-decoupling MIMO antenna system has the characteristics of high isolation, good radiation performance, low correlation and the like, and is suitable for application of the MIMO system.

Referring to fig. 3 and 4, it can be seen that the self-decoupling MIMO antenna system of the present invention can generate one or more resonances, thereby achieving a self-decoupling effect 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 ground radiation antenna and the loop antenna, respectively. The two antennas simultaneously generate resonance in two frequency bands of 3.5GHz and 5.5 GHz. The third curve 6c is the reverse transmission coefficient between the antennas, which represents the coupling degree between the antennas, and it can be known that the isolation degree in both frequency bands is above 12 dB. Thus, the self-decoupling MIMO antenna technology in the present invention can also constitute a compact MIMO antenna system in a multiband mode.

In summary, compared with the prior art, the embodiment has the following characteristics:

1) The self-decoupling MIMO antenna system does not need any coupling reduction structure or circuit, has the characteristics of compact structure, small unit size, close unit spacing, high isolation, low correlation and the like, and has wider application scenes.

2) The compact MIMO antenna system of the present invention is applicable not only to a single frequency band but also to multiple frequency bands.

While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

1. The self-decoupling MIMO antenna system is characterized by comprising a ground plate, a ground radiation antenna and a loop antenna, wherein the ground radiation antenna and the loop antenna are connected with the ground plate; the ground radiation antenna is arranged adjacent to or electrically connected with the loop antenna and is formed in the middle area of the loop antenna.

2. The self-decoupling MIMO antenna system of claim 1, wherein the ground radiating antenna includes a first clearance area, a first feed, a first excitation wire, and a first resonant wire, the first clearance area being a hollowed area of the ground plane, the first excitation wire being disposed in the first clearance area, the first excitation wire including a first component; the first resonant lead is configured at one side of the opening of the first clearance area and comprises a first capacitance element.

3. The self-decoupling MIMO antenna system of claim 1, wherein the loop antenna is disposed outside the ground plate, and includes a second feeding wire, a second excitation wire, and a second resonant wire, both ends of the second resonant wire being connected to the ground plate; the second excitation wire includes a second component.

4. The self-decoupling MIMO antenna system of claim 1, wherein the loop antenna is disposed inside the ground plane and includes a second clearance area, a second feed, and a second excitation wire, the second clearance area being a hollowed area of the ground plane, the second excitation wire being disposed in the second clearance area, the second excitation wire including a second component.

5. The self-decoupling MIMO antenna system of claim 2, wherein a first branch is further connected to the first clearance area, and both ends of the first branch are respectively connected to the ground plane; the first branch includes a third component.

6. The self-decoupling MIMO antenna system of claim 2, wherein a first branch is further connected to the first clearance area, one end of the first branch is connected to the first resonant conductor, and the other end of the first branch is connected to the ground plane.

7. A self-decoupling MIMO antenna system as claimed in claim 3 wherein the intermediate region of the second resonant conductor is further connected to a fourth element.

8. A self-decoupling MIMO antenna system as claimed in claim 3 wherein the second resonant conductor is further connected to a first inductive element.

9. A self-decoupling MIMO antenna system as claimed in claim 3 wherein a second branch is further connected within the second resonant conductor, the second branch including a fifth element.