Multi-frequency MIMO slot antenna and wireless communication equipment

Abstract

The present invention discloses a multi-frequency MIMO slot antenna and a wireless communication device, wherein the multi-frequency MIMO slot antenna comprises an annular metal frame, the annular metal frame comprises a first frame and a second frame connected to the first frame, the first frame is provided with at least one first breakpoint to separate the first frame into at least one first sub-frame and at least one second sub-frame; a dielectric substrate, a metal bottom layer is provided on one side surface of the dielectric substrate; wherein a first slot is provided between the metal bottom layer and the first sub-frame to form a first frequency band MIMO antenna; a second slot is provided between the metal bottom layer and the second sub-frame to form a second frequency band MIMO antenna; a third slot is provided between the metal bottom layer and the second frame to form a broadband slot antenna. The present invention designs the antenna structure in the metal frame, realizes the built-in multi-frequency MIMO slot antenna and the ultra-thinness and miniaturization of the wireless communication device.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to a multi-frequency MIMO slot antenna and wireless communication equipment. Background Art

[0002] With the fifth generation mobile communication system (5G) entering the commercial stage and the popularization of 5G equipment, the antenna design of the new generation of 5G mobile terminals has also had new requirements, including: the antenna operating frequency needs to cover the new 5G frequency band, be compatible with the fourth generation mobile communication (4G) frequency band, and support the multiple input multiple output (MIMO) antenna system to meet the requirements of 5G high transmission rate. In addition, the design of smart phone terminals is committed to pursuing the visual experience of large screen ratio and the texture of metal frame, making the design of mobile phone antenna more difficult. Traditional mobile phone antennas are based on inverted F antennas (IFA), combined with reconfigurable matching networks to cover multiple mobile phone communication frequency bands, and at the same time improve port isolation by maximizing the distance between MIMO antennas. There are two very obvious disadvantages in the traditional mobile phone antenna design scheme: first, the reconfigurable matching circuit composed of RF switches and lumped devices increases the complexity of mobile phone antennas, occupies a larger internal space of the mobile phone, and also reduces the radiation efficiency of the antenna; second, the internal space of the mobile phone is small, and it is difficult to put down multiple antennas. Summary of the invention

[0003] The main purpose of the present invention is to propose a multi-frequency MIMO slot antenna and a wireless communication device, aiming to design the antenna structure in a metal frame, realize the built-in multi-band antenna structure of the wireless communication device and the ultra-thinness and miniaturization of the wireless communication device.

[0004] To achieve the above object, the present invention proposes a multi-frequency MIMO slot antenna, wherein the multi-frequency MIMO slot antenna comprises:

[0005] An annular metal frame, the annular metal frame having a first frame and a second frame connected to the first frame, the first frame being provided with at least one first breakpoint to separate the first frame into at least one first sub-frame and at least one second sub-frame;

[0006] A dielectric substrate, wherein a metal bottom layer is disposed on one side surface of the dielectric substrate; wherein,

[0007] A first gap is provided between the metal bottom layer and the first sub-frame to form a first frequency band MIMO antenna;

[0008] A second gap is provided between the metal bottom layer and the second sub-frame to form a second frequency band MIMO antenna;

[0009] A third gap is arranged between the metal bottom layer and the second frame to form a broadband gap antenna.

[0010] Optionally, the other side surface of the dielectric substrate is further provided with:

[0011] A first microstrip line feeding structure is arranged corresponding to the first slot position, one end of the first microstrip line feeding structure is connected to a feeding power source, and the other end of the first microstrip line feeding structure is electrically connected to the first sub-frame;

[0012] A second microstrip line feeding structure is arranged corresponding to the second slot position, one end of the second microstrip line feeding structure is connected to a feeding power source, and the other end of the second microstrip line feeding structure is electrically connected to the second sub-frame;

[0013] The third microstrip line feeding structure is arranged corresponding to the position of the third slot, one end of the third microstrip line feeding structure is connected to the feeding power source, and the other end of the third microstrip line feeding structure is electrically connected to the second frame.

[0014] Optionally, the other side surface of the dielectric substrate is further provided with:

[0015] A plurality of coaxial ports are arranged on a side of the dielectric substrate away from the metal bottom layer, the inner conductor of each of the coaxial ports is respectively connected to one of the first microstrip line feeding structure, the second microstrip line feeding structure and the third microstrip line feeding structure, and the outer conductor of each of the coaxial ports is connected to the metal bottom layer.

[0016] Optionally, the number of the first sub-frames and the first slots is 4, and each of the first sub-frames, one of the first slots and the metal bottom layer forms a first frequency band MIMO antenna unit.

[0017] Optionally, the number of the second sub-frames and the second slots is 4, and each second sub-frame, a second slot and a metal bottom layer form a second frequency band MIMO antenna unit.

[0018] Optionally, a second breakpoint is arranged on the second frame, and the second breakpoint is arranged away from the third gap.

[0019] Optionally, a fourth gap is provided between the metal bottom layer and the second frame, and the fourth gap is provided on a side of the second breakpoint away from the third gap.

[0020] Optionally, an orthographic projection of the dielectric substrate on the annular metal frame is located within an edge of the annular metal frame.

[0021] The present invention also provides a wireless communication device, which includes the multi-frequency MIMO slot antenna as described above.

[0022] Optionally, the wireless communication device further includes:

[0023] A surface cover and a bottom shell, wherein the surface cover and the bottom shell are respectively arranged on two sides of the annular metal frame of the multi-frequency MIMO slot antenna to enclose and form a mounting cavity;

[0024] An electric control component is disposed in the installation cavity, and the electric control component is electrically connected to the multi-frequency MIMO slot antenna.

[0025] The present invention is provided with a dielectric substrate, and a metal bottom layer, a first feeding point and a second feeding point respectively connected to the metal bottom layer, and a first feeding point coupled and connected to the metal bottom layer are provided on the dielectric substrate. The present invention is also provided on an annular metal frame, and a gap is provided on the annular metal frame to form two sub-frames, so that under the action of the gap, the two sub-frames are coupled and connected, and the metal frame is directly used as an antenna radiator. The metal bottom layer is coupled and connected with the first feeding point, and the first feeding point is electrically connected with the first sub-frame, and the first coupling point between the metal bottom layer and the metal frame can be formed through the first feeding point. The metal bottom layer is electrically connected with the first sub-frame at the first feeding point, and when the second feeding point is electrically connected with the second sub-frame, the first sub-frame is short-circuited with the metal bottom layer through the first feeding point, and one end of the coupling connection is formed, and the second sub-frame is short-circuited with the metal bottom layer through the second feeding point, and the other end of the coupling connection is formed, thereby forming a second coupling point between the metal bottom layer and the metal frame. In this way, according to actual application requirements, when the wireless communication device is working, a corresponding antenna monomer can be formed through the two coupling points. The present invention utilizes the frame of the wireless communication device and opens a gap on the frame. At the same time, coupling technology is used to achieve ultra-thinness and miniaturization of the multi-band antenna. The multi-band antenna is designed in the watch / bracelet frame to achieve internalization and miniaturization of the multi-band antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 A structural perspective view of an embodiment of a multi-frequency MIMO slot antenna of the present invention;

[0028] Figure 2 A top view of an embodiment of a multi-frequency MIMO slot antenna of the present invention;

[0029] Figure 3 A side view of an embodiment of a multi-frequency MIMO slot antenna of the present invention;

[0030] Figure 4 A schematic diagram of dimension marking of a top view of an embodiment of a multi-frequency MIMO slot antenna of the present invention;

[0031] Figure 5 A schematic diagram of dimension markings of a side view of an embodiment of a multi-frequency MIMO slot antenna of the present invention;

[0032] Figure 6 This is a schematic diagram of how the reflection coefficient and insertion loss between ports vary with frequency in an embodiment of a multi-frequency MIMO slot antenna of the present invention.

[0033] Description of Figure Numbers:

[0034] Label name Label name 10 Metal frame 60 First breakpoint 20 Dielectric substrate 70 Low frequency broadband slot antenna 30 Metal base 80 4G MIMO antenna unit 40 Microstrip Line 90 5G MIMO antenna unit 50 Coaxial port

[0035] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0040] The present invention provides a multi-frequency MIMO slot antenna, which is applied to a wireless communication device, and the wireless communication device may be a mobile terminal such as a mobile phone or a tablet.

[0041] Reference Figures 1 to 6 In one embodiment of the present invention, the multi-frequency MIMO slot antenna includes:

[0042] An annular metal frame 10, wherein the annular metal frame 10 comprises a first frame and a second frame connected to the first frame, wherein at least one first breakpoint 60 is provided on the first frame to separate the first frame into at least one first sub-frame and at least one second sub-frame;

[0043] A dielectric substrate 20, wherein a metal bottom layer 30 is disposed on one side surface of the dielectric substrate 20; wherein,

[0044] A first gap is provided between the metal bottom layer 30 and the first sub-frame to form a first frequency band MIMO antenna;

[0045] A second gap is provided between the metal bottom layer 30 and the second sub-frame to form a second frequency band MIMO antenna;

[0046] A third gap is disposed between the metal bottom layer 30 and the second frame to form a broadband gap antenna 70 .

[0047] In this embodiment, the annular metal frame 10 can be made of pure metal material, or it can be composed of metal material and non-metal material. The annular metal frame 10 constitutes a part of the housing of the wireless communication device, does not need to occupy the space on the top of the housing, and can well meet the housing design requirements of ultra-thin wireless communication devices. The annular metal frame 10 can be made of metal materials such as copper and aluminum. The outer contour of the annular metal frame 10 can be circular, square or polygonal. Of course, in other embodiments, the shape of the annular metal frame 10 can be unlimited, as long as it can adapt to the shape of the wireless communication device. The first breakpoint 60 can be formed on the annular metal frame 10 by cutting. It can also be made by using a metallurgical mold and injecting a metal material into the mold. In some embodiments, insulating plastic can also be filled in the first breakpoint 60 to prevent dust from falling into the wireless communication device, and it can also play a waterproof role. The first breakpoint 60 is set on the first frequency band MIMO antenna and the second frequency band MIMO antenna, which can be used to realize a single-ended open-circuit slot antenna. Reasonable setting of the breakpoint can cover multiple mobile phone frequency bands without any matching circuit and is suitable for MIMO systems, which can meet the design requirements of the metal frame full-screen 5G device antenna.

[0048] The dielectric substrate 20 may be implemented by a printed circuit board PCB (Printed Circuit Board), hereinafter referred to as a PCB board. The metal bottom layer 30 serves as a grounding portion in the antenna device. The metal bottom layer 30 may be a pure metal bottom layer 30, or a metal bottom layer 30 at least partially made of metal material. The metal bottom layer 30 is disposed on a side surface of the dielectric substrate 20, specifically, the bottom surface of the dielectric substrate 20.

[0049] The metal bottom layer 30 can be arranged on the dielectric substrate 20 in the form of a patch, or it can be a plating layer etched by photolithography. For example, the metal bottom layer 30 can be formed on the dielectric substrate 20 by a printed circuit wiring process. Specifically, the circuit routing of the metal bottom layer 30 can be formed on the dielectric substrate 20 by copper coating and etching. Alternatively, the formed metal bottom layer 30 circuit routing is attached to the dielectric substrate 20, or pressed onto the dielectric substrate 20 by other processes. The metal bottom layer 30 can be implemented by metal copper foil, or it can be made of other metal materials or non-metallic conductive materials. Among them, the thickness, size and shape of the dielectric substrate 20 can be set according to the actual application product and application environment to meet different application requirements. In a specific embodiment, the shape of the dielectric substrate 20 can be square, such as a rectangle or a square. The shape of the dielectric substrate 20 can also be circular.

[0050] One side of the dielectric substrate 20, specifically the side edge close to the first sub-frame and the second sub-frame, has a rectangular notch, that is, the first gap and the second gap. The metal bottom layer 30, the first gap, the second gap and the metal frame together form a first frequency band MIMO antenna and a second frequency band MIMO antenna. The other side of the dielectric substrate 20, specifically the side edge close to the second frame, has a rectangular notch, that is, the third gap. The metal bottom layer 30, the third gap and the metal frame together form a low-frequency broadband gap antenna 70. Among them, the working bandwidth of the first frequency band MIMO antenna can cover 1700-2700MHz, the working bandwidth of the second frequency band MIMO antenna can cover 3300-4500MHz, and the working bandwidth of the low-frequency broadband gap antenna 70 can cover 700-960MHz. The radiation gap length of the low-frequency broadband gap antenna 70 is half a wavelength. The antenna structure can cover the 2G, 3G and 4G frequency bands of mobile phones, as well as the 5G LTE700 and 3.5GHz frequency bands, and is suitable for 5G mobile phone antennas.

[0051] Reference Figures 1 to 6 In one embodiment, the other side surface of the dielectric substrate 20 is further provided with:

[0052] A first microstrip line feeding structure is arranged corresponding to the first slot position, one end of the first microstrip line feeding structure is connected to a feeding power source, and the other end of the first microstrip line feeding structure is electrically connected to the first sub-frame;

[0053] A second microstrip line feeding structure is arranged corresponding to the second slot position, one end of the second microstrip line feeding structure is connected to a feeding power source, and the other end of the second microstrip line feeding structure is electrically connected to the second sub-frame;

[0054] The third microstrip line feeding structure is arranged corresponding to the position of the third slot, one end of the third microstrip line feeding structure is connected to the feeding power source, and the other end of the third microstrip line feeding structure is electrically connected to the second frame.

[0055] In this embodiment, the first microstrip line feeding structure, the second microstrip line feeding structure and the third microstrip line feeding structure can be microstrip lines 40 laid on the surface of the dielectric substrate 20 facing away from the metal bottom layer 30, and on the front side of the dielectric substrate 20. The outer contour of the microstrip line 40 can be square, circular or polygonal, and can be specifically implemented by metal materials, such as copper or other good conductors. In this embodiment, copper or copper alloy, which has good conductivity and low cost, can be used. The microstrip line 40 can be formed on the dielectric substrate 20 by means of printed circuit wiring technology. Specifically, multiple microstrip lines 40 can be formed on the dielectric substrate 20 by means of copper coating and etching. Alternatively, multiple formed microstrip lines 40 are attached to the dielectric substrate 20, or pressed onto the dielectric substrate 20 by other processes. The microstrip lines 40 are distributed on the edge of the PCB. The microstrip lines 40 cross the gaps on the back side of the PCB on the front side, and are respectively connected to the first sub-frame, the second sub-frame and the second frame in the metal frame, and directly excite each slot antenna.

[0056] Reference Figures 1 to 6 In one embodiment, the other side surface of the dielectric substrate 20 is further provided with:

[0057] A plurality of coaxial ports 50 are arranged on a side of the dielectric substrate 20 away from the metal bottom layer 30 , the inner conductor of each of the coaxial ports 50 is respectively connected to one of the first microstrip line feeding structure, the second microstrip line feeding structure and the third microstrip line feeding structure, and the outer conductor of each of the coaxial ports 50 is connected to the metal bottom layer 30 .

[0058] In this embodiment, the coaxial port 50 can pass through the PCB board in a dual-port coaxial feeding manner, and the coaxial port 50 can be connected to the microstrip line 40 by a coaxial feeding probe, and its position has an impact on low-frequency impedance matching. The coaxial feeding probe has a double-layer conductor, and the outer layer of the coaxial feeding probe is arranged on the same side surface of the dielectric substrate 20 and the metal bottom layer 30, and is electrically connected to the metal bottom layer 30. The outer conductor of the coaxial feeding probe passes through the dielectric substrate 20 and is connected to the microstrip line 40 arranged on the other side surface of the dielectric substrate 20 away from the metal bottom layer 30. The coaxial feeding probe is arranged in an L shape with the microstrip line 40 in each microstrip line feeding structure, forming an L-shaped feeding structure. The coaxial feeding probe transmits energy to the microstrip line 40, and one end of the microstrip line 40 is connected to the inner conductor of the coaxial port 50. The other end of the microstrip line 40 is connected to the metal frame, and the metal bottom layer 30 serves as the metal ground of the slot antenna, so that the microstrip line 40, the first sub-frame, the metal bottom layer 30, and the first slot formed by the metal bottom layer 30 and the metal frame constitute a first frequency band MIMO antenna, and the microstrip line 40, the second sub-frame, the metal bottom layer 30, and the second slot formed by the metal bottom layer 30 and the metal frame constitute a second frequency band MIMO antenna, and the microstrip line 40, the second frame, the metal bottom layer 30, and the third slot formed by the metal bottom layer 30 and the metal frame constitute a low-frequency broadband slot antenna 70. In this embodiment, when the coaxial feeding probe is connected to the microstrip line 40 and the L-shaped microstrip is excited, energy is transmitted to the metal frame to achieve radiation in three frequency bands.

[0059] Reference Figures 1 to 6 In one embodiment, the number of the first sub-frames and the first slots is 4, and each of the first sub-frames, one of the first slots and the metal bottom layer 30 forms a first frequency band MIMO antenna unit.

[0060] The number of the second sub-frames and the second slots is 4, and each of the second sub-frames, a second slot and the metal bottom layer 30 forms a second frequency band MIMO antenna unit.

[0061] In this embodiment, the metal frame may be a square frame, the second sub-frame may be a side frame, the first sub-frame may be set as an upper and lower frame and a side frame arranged opposite to the second sub-frame and respectively connected to the upper and lower frames, that is, the first sub-frame may be an upper frame, a side frame and a lower frame connected in sequence. Of the four first-band MIMO antenna units, two of them may be respectively arranged on the upper and lower frames, and the other two may be arranged in sequence on the side frames. The first-band MIMO slot antenna of this embodiment adopts a four-unit MIMO antenna unit, which may constitute a 4G MIMO antenna, covering the 1.7-2.7GHz frequency band. Of the four second-band MIMO antenna units, two of them may be respectively arranged on the upper and lower frames, and the other two may be arranged in sequence on the side frames. The second-band MIMO slot antenna of this embodiment adopts a four-unit MIMO antenna unit, which may constitute a 5G MIMO antenna, covering the 3.3-4.2GHz frequency band.

[0062] Each antenna unit of the 4G MIMO antenna and the 5G MIMO antenna is a single-ended open slot antenna structure with a length of one quarter wavelength. A metal frame breakpoint is shared between each 4G MIMO antenna unit 80 and the 5G MIMO antenna unit 90 to form a dual antenna structure. Four dual antenna structures are combined into a four-unit 4G MIMO antenna and a four-unit 5G MIMO antenna.

[0063] Reference Figures 1 to 6 In one embodiment, a second breakpoint is arranged on the second frame, and the second breakpoint is arranged away from the third gap.

[0064] A fourth gap is provided between the metal bottom layer 30 and the second frame, and the fourth gap is provided on a side of the second breakpoint away from the third gap.

[0065] In this embodiment, there is a breakpoint on the metal frame at a position slightly lower than the middle of the slot length. The breakpoint is located offset from the center of the slot length, which can increase the working bandwidth of the slot antenna. At the slot breakpoint, the slot width becomes narrower for a certain length, which can reduce the echo loss of the antenna port.

[0066] In one embodiment, the orthographic projection of the dielectric substrate 20 on the annular metal frame 10 is located within the edge of the annular metal frame 10 .

[0067] In this embodiment, the area of ​​the metal bottom layer 30 is smaller than the annular metal frame 10, and the annular metal frame 10 is arranged in a circular or square shape. Figures 4 to 6 , the radiation characteristics of the above multi-frequency MIMO slot antenna are further explained:

[0068] Reference Figure 4 and Figure 5It can be seen that the specific dimensions of the antenna are listed below. The dimensions of the metal frame 10 are: L10=150mm, W10=75mm, H10=1.5mm, H=7mm; the dimensions of the microstrip line 4040 are: W40=2.4mm, W41=2.8mm, W42=1.5mm, L40=6.5mm, L41=7.6mm, L42=5.3mm; the dimensions of the metal frame breakpoint are: W60=0.8mm, W61=7mm; the dimensions of the low-frequency broadband slot antenna 70 are: L70=52.5mm, L71=40.5mm, L72=21mm, W72=2mm; the slot length of the 4G MIMO antenna unit 80 is L80=28mm; the slot length of the 5G MIMO antenna unit 90 is L90=.8mm; the low-frequency broadband slot antenna 70, 4G MIMO antenna unit 80 and 5G The slot width of the MIMO antenna unit 90 is Ws=2.5 mm; the distance between the 4G MIMO antenna unit 80 and the 5G MIMO antenna unit 90 is D1=6 mm.

[0069] Reference Figure 6 As shown in the figure, the reflection coefficient and antenna gain measured by the HFSS simulation software are shown. It can be seen from the figure that the operating bandwidth of the multi-frequency MIMO slot antenna can simultaneously cover 700-960MHz, 1700-2700MHz and 3300-4500MHz. At the same time, a four-unit MIMO antenna is realized in the latter two 4G and 5G frequency bands, and the isolation between ports is higher than -10dB.

[0070] From the above test results, it can be seen that the multi-frequency MIMO slot antenna proposed in the present invention utilizes the gap surrounded by the metal frame and the metal floor of the bottom layer of the PCB to radiate, which can cover multiple mobile phone frequency bands at the same time and meet the needs of 5G mobile phone antennas. In addition, the antenna is small in size, requiring a clearance of only 2.5 mm, and the feeding circuit is simple, and no additional matching circuit is required.

[0071] The present invention also provides a wireless communication device, which includes the multi-frequency MIMO slot antenna as described above.

[0072] The detailed structure of the multi-frequency MIMO slot antenna can be referred to the above-mentioned embodiment, which will not be repeated here; it can be understood that since the above-mentioned multi-frequency MIMO slot antenna is used in the wireless communication device of the present invention, the embodiment of the wireless communication device of the present invention includes all technical solutions of all embodiments of the above-mentioned multi-frequency MIMO slot antenna, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0073] The multi-frequency MIMO slot antenna of the present invention comprises a discontinuous mobile phone metal frame and a double-layer PCB; the PCB is surrounded by the metal frame, the bottom layer of the PCB is a metal surface as an antenna floor, and the top layer of the PCB has 9 metal microstrip lines distributed on the edge of the PCB, which are respectively connected to a coaxial port (port 1-port 9) to directly excite the 9 slot antennas; the metal frame has 5 breakpoints, which are connected to the metal surface of the bottom layer of the PCB to form 2 four-unit MIMO open-circuit slot antennas and a low-frequency broadband slot antenna; the microstrip line jumps the slot on the top layer of the PCB and is connected to the metal frame to excite the slot antenna; the slot widths of the 9 slot antennas are consistent, which is only 2.5 mm; the present invention realizes a low-frequency broadband slot antenna, a four-unit 4G MIMO antenna and a four-unit 5G MIMO antenna by exciting the narrow slot formed by the metal frame and the PCB floor, reasonably sets the breakpoints, and uses the microstrip line on the PCB to jump the slot for direct excitation, can cover multiple mobile phone frequency bands without any matching circuit and is suitable for MIMO systems, and can meet the design requirements of metal frame full-screen 5G mobile phone antennas. This antenna structure can cover mobile phone 2G, 3G and 4G frequency bands, as well as 5G LTE700 and 3.5GHz frequency bands, and is suitable for 5G mobile phone antennas.

[0074] Reference Figures 1 to 6 In one embodiment, the wireless communication device further comprises:

[0075] A surface cover and a bottom shell, wherein the surface cover and the bottom shell are respectively arranged on two sides of the annular metal frame of the multi-frequency MIMO slot antenna to enclose and form a mounting cavity;

[0076] An electric control component is disposed in the installation cavity, and the electric control component is electrically connected to the multi-frequency MIMO slot antenna.

[0077] In this embodiment, the material of the face cover and the bottom shell can be made of hard materials such as plastic, tempered glass, metal, etc., which is not limited here. The electric control component includes a display module, an electric control board, a battery, etc. The face cover can be a touch screen. When the display module is a display screen, the face cover and the display module can be integrated by a screen lamination assembly process. The annular metal frame 100 can be a hollow structure, the face cover is covered on one side of the annular metal frame 100, and the bottom shell is covered on the other end of the annular metal frame 100, so that the face cover, the annular metal frame 100 and the bottom shell are stacked in sequence, and enclosed to form an installation cavity. The face cover and the annular metal frame 100 and the bottom shell and the annular metal frame 100 can be bonded by waterproof glue to achieve waterproofing between the face cover and the annular metal frame 100 and the bottom shell and the annular metal frame 100, so that external moisture will not enter the installation cavity, and the electric control components in the installation cavity can be guaranteed to work normally and stably. The electric control component can realize functions such as calling, sending and receiving information, taking pictures, video calling, scanning QR codes, mobile payment, checking environmental information, and checking physical information. Therefore, in this embodiment, the electric control component includes a display module and a camera, a battery, a speaker, a microphone, a card holder component, a wireless communication module, and sensors that realize various functions, wherein the sensor can be a gravity sensor, an acceleration sensor, a distance sensor, a heart rate sensor, an air pressure sensor, an ultraviolet detector, etc. Among them, the wireless communication module in the electric control component can be a WIFI, 5G communication module, GPS, Bluetooth communication module, etc., and the wireless communication module is electrically connected to the antenna structure, so as to receive and return data through the antenna structure. The electric control component may include elements for identity recognition, such as a fingerprint recognition sensor, a facial recognition sensor, etc. The type and quantity of the antenna structure are different according to the different wireless communication modules. For example, when a WIFI module is provided in the wireless communication device, the antenna structure includes a WIFI antenna that can realize WIFI communication, and when a Bluetooth communication module is provided, the antenna structure includes a Bluetooth antenna that can realize Bluetooth communication, etc.

[0078] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A multi-frequency MIMO slot antenna, characterized in that: The multi-frequency MIMO slot antenna comprises: An annular metal frame, the annular metal frame having a first frame and a second frame connected to the first frame, the first frame being provided with at least one first breakpoint to separate the first frame into at least one first sub-frame and at least one second sub-frame; A dielectric substrate, wherein a metal bottom layer is disposed on one side surface of the dielectric substrate; wherein, A first gap is provided between the metal bottom layer and the first sub-frame to form a first frequency band MIMO antenna; A second gap is provided between the metal bottom layer and the second sub-frame to form a second frequency band MIMO antenna; A third gap is provided between the metal bottom layer and the second frame to form a broadband gap antenna; a second breakpoint is provided on the second frame, and the second breakpoint is provided away from the third gap; A fourth gap is arranged between the metal bottom layer and the second frame, and the fourth gap is arranged on a side of the second breakpoint away from the third gap.

2. The multi-frequency MIMO slot antenna according to claim 1, wherein: The other side surface of the dielectric substrate is also provided with: A first microstrip line feeding structure is arranged corresponding to the first slot position, one end of the first microstrip line feeding structure is connected to a feeding power source, and the other end of the first microstrip line feeding structure is electrically connected to the first sub-frame; A second microstrip line feeding structure is arranged corresponding to the second slot position, one end of the second microstrip line feeding structure is connected to a feeding power source, and the other end of the second microstrip line feeding structure is electrically connected to the second sub-frame; The third microstrip line feeding structure is arranged corresponding to the position of the third slot, one end of the third microstrip line feeding structure is connected to the feeding power source, and the other end of the third microstrip line feeding structure is electrically connected to the second frame.

3. The multi-frequency MIMO slot antenna according to claim 2, wherein: The other side surface of the dielectric substrate is also provided with: A plurality of coaxial ports are arranged on a side of the dielectric substrate away from the metal bottom layer, the inner conductor of each of the coaxial ports is respectively connected to one of the first microstrip line feeding structure, the second microstrip line feeding structure and the third microstrip line feeding structure, and the outer conductor of each of the coaxial ports is connected to the metal bottom layer.

4. The multi-frequency MIMO slot antenna according to claim 1, wherein: The number of the first sub-frames and the first slots is 4 each, and each of the first sub-frames, one of the first slots and the metal bottom layer forms a first frequency band MIMO antenna unit.

5. The multi-frequency MIMO slot antenna according to claim 1, wherein: The number of the second sub-frames and the second slots is 4 each, and each second sub-frame, a second slot and a metal bottom layer form a second frequency band MIMO antenna unit.

6. The multi-frequency MIMO slot antenna according to any one of claims 1 to 5, characterized in that: The orthographic projection of the dielectric substrate on the annular metal frame is located within the edge of the annular metal frame.

7. A wireless communication device, characterized in that: The wireless communication device comprises the multi-frequency MIMO slot antenna as described in any one of claims 1-6.

8. The wireless communication device according to claim 7, wherein: The wireless communication device further comprises: A surface cover and a bottom shell, wherein the surface cover and the bottom shell are respectively arranged on two sides of the annular metal frame of the multi-frequency MIMO slot antenna to enclose and form a mounting cavity; An electric control component is disposed in the installation cavity, and the electric control component is electrically connected to the multi-frequency MIMO slot antenna.

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