Ultra-wideband MIMO antenna with notch characteristic

Abstract

An ultra wide band MIMO antenna with a notch feature disclosed by the present application comprises a dielectric layer, a radiation layer and a defect ground layer, the dielectric layer comprises a first surface and a second surface opposite to the first surface, the radiation layer is arranged on the first surface, the radiation layer comprises two antenna radiators, and the defect ground layer is arranged on the second surface. Each antenna radiator comprises a radiation patch and a micro-strip feeder electrically connected with the radiation patch, a U-shaped gap is formed in each micro-strip feeder, and a defect ground layer is arranged on the second surface. Thus, the U-shaped gap is formed in the microstrip feeder line, and the notch with the independently controllable center frequency is introduced, so that the microstrip antenna has in-band notch, and in-band interference can be effectively suppressed.

Description

Technical Field

[0001] The invention relates to an antenna, in particular to an ultra-wideband MIMO antenna with notch characteristics. Background Art

[0002] Ultra-wideband communication systems have the advantages of high transmission rate, low cost, and low power consumption. However, ultra-wideband antennas, as one of the key components of ultra-wideband communication systems, have the problem of multipath attenuation, making it difficult to transmit over long distances. In order to solve the problem of multipath attenuation and further increase the signal transmission rate, ultra-wideband MIMO antennas have been proposed. MIMO technology integrates two or more antenna units on a dielectric substrate. The combination of ultra-wideband technology and MIMO technology can achieve simultaneous and parallel transmission of multiple path signals, effectively solving the problem of multipath attenuation of ultra-wideband. However, existing ultra-wideband MIMO antennas often do not have in-band notching and cannot effectively suppress in-band interference, which greatly affects their use in wireless communication systems. Summary of the invention

[0003] The embodiment of the present invention aims to provide an ultra-wideband MIMO antenna with a notch feature, which can solve the technical problem in the prior art that the ultra-wideband MIMO antenna is difficult to effectively suppress in-band interference.

[0004] The embodiment of the present invention solves the technical problem by adopting the following technical solution:

[0005] The present application discloses an ultra-wideband MIMO antenna with notch characteristics, comprising:

[0006] a dielectric layer, the dielectric layer comprising a first surface and a second surface opposite to the first surface;

[0007] A radiation layer disposed on the first surface, the radiation layer comprising two antenna radiators, each of the antenna radiators comprising a radiation patch and a microstrip feeder electrically connected to the radiation patch, and a U-shaped gap is provided on the microstrip feeder; and

[0008] A defective formation is disposed on the second surface.

[0009] By opening a U-shaped gap on the microstrip feed line, a notch with a separately controllable center frequency is introduced, so that the present application has an in-band notch, which can effectively suppress in-band interference.

[0010] As a possible implementation of an ultra-wideband MIMO antenna with a notch feature of the present application, the U-shaped slot includes a first slot, a second slot, and a third slot connecting the first slot and the second slot, the first slot is arranged parallel to the second slot, and the third slot is perpendicular to the first slot and the second slot.

[0011] As a possible implementation of an ultra-wideband MIMO antenna with a notch feature of the present application, the lengths of the first slot and the second slot are both 7.5 mm, the distance between the first slot and the second slot is 0.67 mm, and the widths of the first slot, the second slot and the third slot are all 0.13 mm.

[0012] As a possible implementation of an ultra-wideband MIMO antenna with a notch feature of the present application, the microstrip feed line includes a first end and a second end opposite to the first end, the first end is connected to the radiation patch, the second end is aligned with the edge of the dielectric layer, and the open end of the U-shaped gap faces the second end.

[0013] As a possible implementation mode of an ultra-wideband MIMO antenna with a notch feature of the present application, the radiation patches include a first metal edge, a second metal edge, a third metal edge and a fourth metal edge connected in sequence, the first metal edge is arranged in parallel with the third metal edge, the second metal edge is arranged in parallel with the fourth metal edge, the second metal edge is arranged perpendicular to the first metal edge, the second metal edge is away from the microstrip feeder and perpendicular to the extension direction of the microstrip feeder, the first end is connected to the fourth metal edge, the length of the first metal edge and the third metal edge are both 7 mm, the distance between the first metal edge and the boundary of the dielectric layer is 4.9 mm, the distance between the first metal edge and the microstrip feeder is 4.1 mm, the distance between the second metal edge and the boundary of the dielectric layer is 17 mm, the distance between the third metal edge and the microstrip feeder is 2.47 mm, the length of the microstrip feeder is 8 mm, and the width of the microstrip feeder is 1.53 mm.

[0014] As a possible implementation of an ultra-wideband MIMO antenna with a notch feature of the present application, the two antenna radiators are symmetrically arranged about a diagonal line of the dielectric layer.

[0015] As a possible implementation of an ultra-wideband MIMO antenna with notch characteristics of the present application, the defective stratum is provided with two L-shaped gaps.

[0016] As a possible implementation of an ultra-wideband MIMO antenna with a notch feature of the present application, the two L-shaped slots are symmetrically arranged about a diagonal line of the dielectric layer.

[0017] As a possible implementation manner of an ultra-wideband MIMO antenna with a notch feature of the present application, each of the L-shaped slots is enclosed by a first side, a second side, a third side, a fourth side, a fifth side and a sixth side, the first side is aligned with an edge of the dielectric layer, the sixth side is aligned with another edge of the dielectric layer, the sixth side is arranged perpendicular to the first side, the first side is arranged parallel to the third side and the fifth side, and the sixth side is arranged parallel to the second side and the fourth side.

[0018] As a possible implementation of an ultra-wideband MIMO antenna with a notch feature of the present application, the length of the first side is 15 mm, the length of the second side is 12 mm, the length of the third side is 7 mm, the length of the fourth side is 10 mm, the length of the fifth side is 8 mm, the length of the sixth side is 2 mm, the length of the dielectric layer is 32 mm, the width of the dielectric layer is 32 mm, and the dielectric constant of the dielectric layer is 4.4. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0020] Figure 1 A side view of an ultra-wideband MIMO antenna with notch characteristics disclosed in an embodiment of the present invention;

[0021] Figure 2 A front view of an ultra-wideband MIMO antenna with notch characteristics disclosed in an embodiment of the present invention;

[0022] Figure 3 Another front view of an ultra-wideband MIMO antenna with notch characteristics disclosed in an embodiment of the present invention;

[0023] Figure 4 A schematic structural diagram of a microstrip feeder of an ultra-wideband MIMO antenna with notch characteristics disclosed in an embodiment of the present invention;

[0024] Figure 5 A back view of an ultra-wideband MIMO antenna with notch characteristics disclosed in an embodiment of the present invention;

[0025] Figure 6 Another back view of an ultra-wideband MIMO antenna with notch characteristics disclosed in an embodiment of the present invention;

[0026] Figure 7An ultra-wideband MIMO antenna with notch characteristics disclosed in an embodiment of the present invention is configured to transmit signals with different L S1 The change curve diagram of

[0027] Figure 8 A curve diagram showing the change of an ultra-wideband MIMO antenna with notch characteristics with different D2s disclosed in an embodiment of the present invention;

[0028] Fig. 9 A curve diagram showing the change of an ultra-wideband MIMO antenna with notch characteristics with different D3s disclosed in an embodiment of the present invention;

[0029] Fig.10 An ultra-wideband MIMO antenna with notch characteristics disclosed in an embodiment of the present invention is configured to transmit signals with different W R The change curve diagram of

[0030] Fig.11 An ultra-wideband MIMO antenna with notch characteristics disclosed in an embodiment of the present invention is configured to transmit signals with different L S2 The change curve diagram of

[0031] Fig.12 An ultra-wideband MIMO antenna with notch characteristics disclosed in an embodiment of the present invention is configured to transmit signals with different L S3 The change curve diagram of

[0032] Fig.13 An ultra-wideband MIMO antenna with notch characteristics disclosed in an embodiment of the present invention is configured to transmit signals with different W S2 The change curve diagram of

[0033] Fig.14 A curve diagram of simulation results of reflection coefficient and transmission coefficient of an ultra-wideband MIMO antenna with notch characteristics disclosed in an embodiment of the present invention;

[0034] Fig.15 It is a curve diagram of simulation results of gain and radiation efficiency of an ultra-wideband MIMO antenna with notch characteristics disclosed in an embodiment of the present invention.

[0035] Figure numbers and corresponding meanings:

[0036] Ultra-wideband MIMO antenna 10 with notch characteristics;

[0037] Dielectric layer 11, first surface 11a, second surface 11b;

[0038] Radiating layer 12, antenna radiator 121, radiating patch 121a, microstrip feed line 121b, U-shaped slot 121c, first slot 121d, second slot 121e, third slot 121f, first end 121g, second end 121h, first metal edge 121i, second metal edge 121j, third metal edge 121k, fourth metal edge 121l;

[0039] Defective formation 13, L-shaped gap 131, first side 131a, second side 131b, third side 131c, fourth side 131d, fifth side 131e, and sixth side 131f. DETAILED DESCRIPTION

[0040] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0042] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] The present application discloses an ultra-wideband MIMO antenna 10 with notch characteristics, such as Figure 1-Figure 2As shown, it includes a dielectric layer 11, a radiation layer 12 and a defective layer 13, the dielectric layer 11 includes a first surface 11a and a second surface 11b opposite to the first surface 11a, the radiation layer 12 is arranged on the first surface 11a, the radiation layer 12 includes two antenna radiators 121, each antenna radiator 121 includes a radiation patch 121a and a microstrip feeder 121b electrically connected to the radiation patch 121a, a U-shaped gap 121c is opened on the microstrip feeder 121b, and the defective layer 13 is arranged on the second surface 11b.

[0044] The present application discloses an ultra-wideband MIMO antenna 10 with a notch feature. By providing a U-shaped slot 121c on a microstrip feed line 121b, a notch with a separately controllable center frequency is introduced, so that the present application has an in-band notch and can effectively suppress in-band interference.

[0045] Please refer to Figure 3 and Figure 4 In this embodiment, the U-shaped slot 121c includes a first slot 121d, a second slot 121e, and a third slot 121f connecting the first slot 121d and the second slot 121e. The first slot 121d is arranged in parallel with the second slot 121e, and the third slot 121f is perpendicular to the first slot 121d and the second slot 121e. The length of the first slot 121d is equal to the length of the second slot 121e. The first slot 121d, the second slot 121e, and the third slot 121f are all rectangular. In this way, the in-band interference can be effectively suppressed.

[0046] Furthermore, the length L of the first gap 121d is S1 6.5mm-7.5mm. Please refer to Figure 7 , L S1 The values ​​are 6.5mm, 7.0mm and 7.5mm respectively. It can be seen from the figure that the antenna performance varies with different L S1 The change of parameter L S1 The passband bandwidth of the ultra-wideband MIMO antenna 10 with notch characteristics in the present application remains unchanged, and within the passband, the reflection coefficient below the notch center frequency becomes worse, and the reflection coefficient above becomes better; except for the notch center frequency, its isolation remains almost unchanged; the notch center frequency increases with L S1 becomes larger and moves downward.

[0047] In another embodiment, the lengths of the first gap 121d and the second gap 121e are both 7.5 mm, the distance D1 between the first gap 121d and the second gap 121e is 0.67 mm, and the widths W of the first gap 121d, the second gap 121e, and the third gap 121f are S1 The diameters of the two electrodes are both 0.13 mm. This can better suppress in-band interference.

[0048] In this embodiment, the microstrip feed line 121b includes a first end 121g and a second end 121h opposite to the first end 121g, the first end 121g is connected to the radiation patch 121a, the second end 121h is aligned with the edge of the dielectric layer 11, the opening end of the U-shaped slot 121c faces the second end 121h, and the third slot 121f of the U-shaped slot 121c is located at the first end 121g. In this way, the in-band interference can be effectively suppressed.

[0049] In this embodiment, the radiation layer 12 is a metal layer, the dielectric layer 11 is a square, and the two antenna radiators 121 are symmetrically arranged about the diagonal line AA' of the dielectric layer 11. The extension direction of the microstrip feed line 121b of one antenna radiator 121 is perpendicular to the extension direction of the microstrip feed line 121b of the other antenna radiator 121.

[0050] In this way, the two antenna radiators 121 have a symmetrical structure, which helps to achieve good antenna performance and a compact structure.

[0051] In this embodiment, the radiation patch 121a is rectangular, and each radiation patch 121a includes a first metal edge 121i, a second metal edge 121j, a third metal edge 121k and a fourth metal edge 121l connected in sequence, the first metal edge 121i is arranged in parallel with the third metal edge 121k, the second metal edge 121j is arranged in parallel with the fourth metal edge 121l, the second metal edge 121j is arranged perpendicular to the first metal edge 121i, the second metal edge 121j is away from the microstrip feed line 121b and perpendicular to the extension direction of the microstrip feed line 121b, and the first end 121g of the microstrip feed line 121b is connected to the fourth metal edge 121l. In this way, the structure is simple and the layout is compact.

[0052] Furthermore, the distance D2 between the first metal edge 121i of the radiation patch 121a and the microstrip feed line 121b is 3.3 mm-4.1 mm. Figure 8 , the values ​​of D2 are 3.3mm, 3.7mm and 4.1mm respectively. From the figure, it can be seen how the antenna performance changes with different D2. As the parameter D2 increases, the passband bandwidth of the ultra-wideband MIMO antenna 10 with a notch feature of the present application becomes larger, and within the passband, the reflection coefficient below the notch center frequency becomes slightly worse, and the reflection coefficient above becomes better; its isolation becomes better within the passband; the notch center frequency remains unchanged.

[0053] The distance D3 between the third metal edge 121k of the radiation patch 121a and the microstrip feed line 121b is 2.07 mm-2.47 mm. Fig. 9The values ​​of D3 are 2.07mm, 2.27mm and 2.47mm respectively. From the figure, it can be seen how the antenna performance changes with different D3. As the parameter D3 increases, the passband bandwidth of the ultra-wideband MIMO antenna 10 with a notch feature of the present application becomes slightly smaller, and within the passband, the reflection coefficient below the notch center frequency becomes slightly worse, and the reflection coefficient above it remains almost unchanged; its isolation becomes slightly better within the passband; and the notch center frequency remains unchanged.

[0054] The length W of the third metal edge 121k of the radiation patch 121a is R 7mm-8mm. Please refer to Fig.10 , W R The values ​​are 7mm, 7.5mm and 8mm respectively. It can be seen from the figure that the antenna performance varies with different W R The change of parameter W R As the frequency of the notch increases, the passband bandwidth of the ultra-wideband MIMO antenna 10 with a notch characteristic in the present application becomes smaller, and within the passband, the reflection coefficient below the notch center frequency is good, and the reflection coefficient above it becomes worse; its isolation deteriorates within the passband range; the notch center frequency remains unchanged.

[0055] In another embodiment, the distance D2 between the first metal edge 121i of the radiation patch 121a and the microstrip feed line 121b is 4.1 mm, the distance D3 between the third metal edge 121k of the radiation patch 121a and the microstrip feed line 121b is 2.47 mm, the distance D4 between the first metal edge 121i of the radiation patch 121a and the boundary of the dielectric layer 11 is 4.9 mm, the distance D5 between the second metal edge 121j of the radiation patch 121a and the boundary of the dielectric layer 11 is 17 mm, and the length W of the first metal edge 121i and the third metal edge 121k of the radiation patch 121a is 2.47 mm. R are both 7 mm, and the length L of the microstrip feed line 121b is F The width W of the microstrip feed line 121b is 8 mm. F It is 1.53 mm, and the microstrip feed line 121b is a 50 ohm feed line.

[0056] In this way, the ultra-wideband MIMO antenna 10 with notch characteristics of the present application not only has high isolation but also has in-band notch, can effectively suppress in-band interference, and has good antenna performance.

[0057] In this embodiment, please refer to Figure 5 and Figure 6, the defective stratum 13 is provided with two L-shaped gaps 131. In this way, by providing two L-shaped gaps 131 on the defective bottom layer, the isolation between the antenna units can be effectively improved, so that the distance between the two antenna radiators 121 can be set smaller, the overall structure is compact, and the miniaturization of the ultra-wideband MIMO antenna is realized. Therefore, the present application does not need to set the distance between the antenna units to be larger in order to ensure a higher isolation like the existing ultra-wideband MIMO antenna, so as to prevent the increase of mutual interference between the antenna units due to coupling.

[0058] The present application discloses an ultra-wideband MIMO antenna 10 with a notch feature, which is a miniaturized ultra-wideband MIMO antenna. It has high isolation and a small size, and has an in-band notch, which can effectively suppress in-band interference.

[0059] Furthermore, the defective stratum 13 is composed of a metal stratum with a pair of L-shaped gaps 131 , the two L-shaped gaps 131 are symmetrically arranged about the diagonal line AA′ of the dielectric layer 11 , and each L-shaped gap 131 is composed of two vertically placed and connected rectangular gaps.

[0060] In this way, by opening two symmetrically arranged L-shaped slots 131 on the defective stratum 13, it is more conducive to increasing the bandwidth and optimizing the matching, increasing the isolation between the two antenna units, improving the radiation performance, and converting the directional antenna into an omnidirectional antenna.

[0061] In this embodiment, each L-shaped slot 131 is enclosed by a first side 131a, a second side 131b, a third side 131c, a fourth side 131d, a fifth side 131e and a sixth side 131f. The first side 131a is aligned with one edge of the dielectric layer 11, the sixth side 131f is aligned with the other edge of the dielectric layer 11, the sixth side 131f is vertically arranged with the first side 131a, the first side 131a is parallel to the third side 131c and the fifth side 131e, and the sixth side 131f is parallel to the second side 131b and the fourth side 131d. One L-shaped slot 131 is located at the upper right corner of the dielectric layer 11, and the other L-shaped slot 131 is located at the lower left corner of the dielectric layer 11. In this way, it is more conducive to increasing the bandwidth, increasing the isolation between the two antenna units, and improving the radiation performance.

[0062] Furthermore, the length L of the first side 131a of the L-shaped gap 131 is S2 11mm-15mm. Please refer to Fig.11 , L S2 The values ​​are 11mm, 13mm and 15mm respectively. It can be seen from the figure that the antenna performance varies with different L S2 The change of parameter L S2As the frequency of the notch increases, the passband bandwidth of the ultra-wideband MIMO antenna 10 with a notch characteristic in the present application becomes larger, and within the passband, the reflection coefficient below the notch center frequency is good, and the reflection coefficient above it becomes worse; its isolation becomes worse within the passband range; the notch center frequency remains unchanged.

[0063] The length L of the second side 131 b of the L-shaped slot 131 S3 11mm-13mm. Please refer to Fig.12 , L S3 The values ​​are 11mm, 12mm and 13mm respectively. It can be seen from the figure that the antenna performance varies with different L S3 The change of parameter L S3 The passband bandwidth of the ultra-wideband MIMO antenna 10 with notch characteristics in the present application is L S3 When it is 12mm, the bandwidth is the largest, and within the passband, the reflection coefficient below the notch center frequency is good, and the reflection coefficient above it becomes worse; its isolation becomes worse within the passband range; the notch center frequency remains unchanged.

[0064] The length W of the sixth side 131f of the L-shaped slot 131 S2 2mm-5mm. Please refer to Fig.13 , W S2 The values ​​are 2mm, 3.5mm and 5mm respectively. It can be seen from the figure that the antenna performance varies with different W S2 The change of parameter W S2 As the frequency of the notch increases, the passband bandwidth of the ultra-wideband MIMO antenna 10 with a notch characteristic in the present application becomes smaller, and within the passband, the reflection coefficient below the notch center frequency is good, and the reflection coefficient above it becomes worse; its isolation deteriorates within the passband range; the notch center frequency remains unchanged.

[0065] The ultra-wideband MIMO antenna 10 with notch characteristics of the present application is obtained by studying the key parameters L S1 , L S2 , L S3 , W S2 , D2, D3 and W R The impact on the performance of the filtering antenna and the key parameter L S1 , L S2 , L S3 , W S2 , D2, D3 and W R Optimization is performed to obtain the desired antenna performance.

[0066] In another embodiment, the size of the ultra-wideband MIMO antenna 10 with notch characteristics of the present application is 32mm*32mm, the dielectric constant of the dielectric layer 11 is 4.4, the dielectric loss is 0.02, the dielectric layer 11 is a circuit board with a thickness of 0.8mm, and the length L of the dielectric layer 11 is G The width W of the dielectric layer 11 is 32 mm. G The length L of the first gap 121d of the U-shaped gap 121c is 32mm, the radiation layer 12 and the defective layer 13 are both copper-plated and have a thickness of 0.035mm; S1 The distance D1 between the first gap 121d and the second gap 121e of the U-shaped gap 121c is 0.67mm, and the widths W of the first gap 121d, the second gap 121e and the third gap 121f of the U-shaped gap 121c are S1 are all 0.13 mm; the distance D2 between the first metal edge 121i of the radiation patch 121a and the microstrip feed line 121b is 4.1 mm, the distance D3 between the third metal edge 121k of the radiation patch 121a and the microstrip feed line 121b is 2.47 mm, the distance D4 between the first metal edge 121i of the radiation patch 121a and the boundary of the dielectric layer 11 is 4.9 mm, the distance D5 between the second metal edge 121j of the radiation patch 121a and the boundary of the dielectric layer 11 is 17 mm, and the length W of the first metal edge 121i and the third metal edge 121k of the radiation patch 121a is R are both 7 mm, and the length L of the microstrip feed line 121b is F The width W of the microstrip feed line 121b is 8 mm. F is 1.53 mm, the microstrip feed line 121b is a 50 ohm feed line; the length L of the first side 131a of the L-shaped gap 131 of the defective formation 13 S2 is 15 mm, and the length L of the second side 131 b of the L-shaped gap 131 is S3 The length of the third side 131c of the L-shaped gap 131 is 7mm, the length of the fourth side 131d of the L-shaped gap 131 is 10mm, the length of the fifth side 131e of the L-shaped gap 131 is 8mm, and the length of the sixth side 131f of the L-shaped gap 131 is W S2 is 2 mm, and the length of the fifth side 131e of the L-shaped slot 131 is equal to the length L of the microstrip feed line 121b. F Similarly, the length of the third side 131c of the L-shaped slot 131 is equal to the length W of the first metal side 121i and the third metal side 121k of the radiation patch 121a. R same.

[0067] The simulation results of reflection coefficient and transmission coefficient of an ultra-wideband MIMO antenna 10 with notch characteristics in the present application are as follows: Fig.14 As shown by Fig.14 It can be seen that the bandwidth range of the antenna reflection coefficient less than -10dB is 3.19 to 10.07GHz, the center frequency is 6.63GHz, the absolute bandwidth is 6.88GHz, and the relative bandwidth is 103.8%, showing the characteristics of ultra-wideband. Within the bandwidth range, its isolation is greater than 15.4dB; at 6.1GHz, there is a notch, and the isolation here is as high as 49.9dB.

[0068] The gain and radiation efficiency simulation results of an ultra-wideband MIMO antenna 10 with notch characteristics in this application are as follows: Fig.15 As shown by Fig.15 It can be seen that the antenna not only has high gain and high radiation efficiency in the passband, but also has up to 10.5 dB of in-band suppression at the notch center frequency. The ultra-wideband MIMO antenna 10 with notch characteristics of the present application is an omnidirectional antenna with high gain.

[0069] Of course, the parameters of the ultra-wideband MIMO antenna 10 with notch characteristics of the present application are not limited to the above-mentioned implementation mode, and can be optimized and adjusted according to the desired antenna performance. For example, when the parameters of the dielectric layer 11 change, the simulation results of the reflection coefficient and isolation of the ultra-wideband MIMO antenna 10 with notch characteristics can be analyzed, and the parameters of the radiation patch 121a, microstrip feed line 121b, U-shaped slot 121c and L-shaped slot 131 can be adjusted accordingly to obtain optimized matching parameters.

[0070] To sum up, the bandwidth and in-band matching of an ultra-wideband MIMO antenna 10 with a notch characteristic in the present application are mainly determined by the parameters of the radiation patch 121a and the parameters of the L-shaped slot 131 on the defective formation 13, its radiation performance is mainly determined by the parameters of the L-shaped slot 131 on the defective formation 13, its isolation is mainly determined by the positions of the two radiation patches 121a and the parameters of the L-shaped slot 131 on the defective formation 13, and its notch is mainly determined by the parameters of the U-shaped slot 121c on the microstrip feed line 121b.

[0071] The present application discloses an ultra-wideband MIMO antenna 10 with a notch feature, which introduces a notch with a separately controllable center frequency by opening a U-shaped slot 121c on a microstrip feed line 121b, thereby effectively suppressing in-band interference. At the same time, by opening two L-shaped slots 131 on a defective stratum 13, the isolation between antenna units can be effectively improved, so that the spacing between the two radiation patches 121a can be smaller, that is, the two antenna units do not need to be arranged with a large spacing to ensure high isolation. Therefore, the present application achieves miniaturization while ensuring high isolation and has in-band notch.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0073] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An ultra-wideband MIMO antenna with notch characteristics, characterized in that: include: a dielectric layer, the dielectric layer comprising a first surface and a second surface opposite to the first surface; A radiation layer disposed on the first surface, the radiation layer comprising two antenna radiators, each of the antenna radiators comprising a radiation patch and a microstrip feeder electrically connected to the radiation patch, and a U-shaped gap is provided on the microstrip feeder; and A defective formation is disposed on the second surface.

2. The ultra-wideband MIMO antenna with notch characteristics according to claim 1, characterized in that: The U-shaped gap includes a first gap, a second gap and a third gap connecting the first gap and the second gap, the first gap is arranged in parallel with the second gap, and the third gap is perpendicular to the first gap and the second gap.

3. The ultra-wideband MIMO antenna with notch characteristics according to claim 2, characterized in that: The lengths of the first gap and the second gap are both 7.5 mm, the distance between the first gap and the second gap is 0.67 mm, and the widths of the first gap, the second gap and the third gap are all 0.13 mm.

4. The ultra-wideband MIMO antenna with notch characteristics according to claim 3, characterized in that: The microstrip feed line includes a first end and a second end opposite to the first end, the first end is connected to the radiation patch, the second end is aligned with the edge of the dielectric layer, and the opening end of the U-shaped slot faces the second end.

5. The ultra-wideband MIMO antenna with notch characteristics according to claim 4, characterized in that: The radiation patches all include a first metal edge, a second metal edge, a third metal edge and a fourth metal edge connected in sequence, the first metal edge is arranged in parallel with the third metal edge, the second metal edge is arranged in parallel with the fourth metal edge, the second metal edge is arranged perpendicular to the first metal edge, the second metal edge is away from the microstrip feeder and perpendicular to the extension direction of the microstrip feeder, the first end is connected to the fourth metal edge, the lengths of the first metal edge and the third metal edge are both 7 mm, the distance between the first metal edge and the boundary of the dielectric layer is 4.9 mm, the distance between the first metal edge and the microstrip feeder is 4.1 mm, the distance between the second metal edge and the boundary of the dielectric layer is 17 mm, the distance between the third metal edge and the microstrip feeder is 2.47 mm, the length of the microstrip feeder is 8 mm, and the width of the microstrip feeder is 1.53 mm.

6. The ultra-wideband MIMO antenna with notch characteristics according to claim 5, characterized in that: The two antenna radiators are symmetrically arranged about the diagonal line of the dielectric layer.

7. An ultra-wideband MIMO antenna with notch characteristics according to any one of claims 1 to 6, characterized in that: The defective stratum has two L-shaped gaps.

8. The ultra-wideband MIMO antenna with notch characteristics according to claim 7, characterized in that: The two L-shaped gaps are symmetrically arranged about a diagonal line of the dielectric layer.

9. The ultra-wideband MIMO antenna with notch characteristics according to claim 8, characterized in that: Each of the L-shaped gaps is enclosed by a first side, a second side, a third side, a fourth side, a fifth side and a sixth side, wherein the first side is aligned with an edge of the dielectric layer, the sixth side is aligned with another edge of the dielectric layer, the sixth side is arranged perpendicular to the first side, the first side is arranged parallel to the third side and the fifth side, and the sixth side is arranged parallel to the second side and the fourth side.

10. The ultra-wideband MIMO antenna with notch characteristics according to claim 9, characterized in that: The length of the first side is 15 mm, the length of the second side is 12 mm, the length of the third side is 7 mm, the length of the fourth side is 10 mm, the length of the fifth side is 8 mm, the length of the sixth side is 2 mm, the length of the dielectric layer is 32 mm, the width of the dielectric layer is 32 mm, and the dielectric constant of the dielectric layer is 4.4.

Images