A MIMO omni-directional antenna

Abstract

The application discloses a MIMO omnidirectional antenna and relates to the technical field of covering antennas, and solves the problems of a large volume of a multi-port antenna and signal interference of ports under multi-system and large capacity.The technical scheme points of the application are as follows: a shell is arranged, at least two monopole subassemblies are arranged in the shell, an isolation belt for avoiding mutual influence of signals is arranged between adjacent monopole subassemblies, and the adjacent monopole subassemblies are arranged in intersecting mode along the extension line of the polarization direction of the monopole subassemblies.Through the above scheme, the MIMO antenna can effectively reduce signal interference between adjacent ports, has a light and thin appearance size, and is compatible with different systems such as 2G / 3G / 4G / 5G.

Description

Technical Field

[0001] The present invention relates to the technical field of coverage antennas, and in particular to a MIMO omnidirectional antenna. Background Art

[0002] With the development of mobile communications, data capacity requirements are increasing. This translates to increasing the number of antennas or designing antennas with more ports, the latter being the most common approach. In the 5G era, the high speeds, large capacity, and low latency characteristics necessitate the increasing use of multi-port antennas. At the same time, compatibility with other frequency bands demands ever-wider antenna bandwidths. However, the overall antenna size must be considered within the constraints of the installation environment, limiting its size and potentially requiring reduction. This has led to changes in antenna unit and integrated design.

[0003] Multi-port antennas are essentially integrated designs of multiple antennas. Each port corresponds to a separate antenna. When antennas are too close together, interference occurs. When they are too far apart, the integrated antenna becomes bulky. The industry has established isolation as a metric to quantify the degree of interference. Summary of the Invention

[0004] The purpose of the present invention is to provide a MIMO omnidirectional antenna that has the ability to achieve omnidirectional radiation with a relative bandwidth of nearly 200%, so as to improve signal gain, effectively reduce signal interference between adjacent ports, and effectively improve the space utilization inside the shell. It also has the advantages of good isolation and excellent intermodulation.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: a MIMO omnidirectional antenna, comprising a shell, wherein at least two monopole components are arranged in the shell, and isolation belts are provided between adjacent monopole components to avoid mutual influence of signals, and adjacent monopole components are arranged to intersect along the extension lines of their own polarization directions.

[0006] According to a further configuration of the present invention, adjacent monopole components are arranged vertically along extension lines of their own polarization directions.

[0007] According to a further configuration of the present invention, the number of the monopole components is at least four, and adjacent isolation bands intersect and combine to form a cross isolation band having a cross-shaped cross section.

[0008] According to a further configuration of the present invention, the length of the isolation belt is 50 to 150 mm, the width of the isolation belt is 0.1 to 30 mm, and the thickness of the isolation belt is 0.1 to 30 mm.

[0009] According to a further configuration of the present invention, the isolation zone is a conductor.

[0010] By adopting the above technical solution, four monopole components can achieve omnidirectional radiation of four ports, and further can achieve omnidirectional radiation of nearly 200% relative bandwidth between 100MHz and 20GHz, so as to improve the signal gain. Since the radiation of the signal is non-directional, the simultaneous setting of the four ports can ensure the radiation of the signal, and the cross isolation band with a cross-shaped cross section composed of four isolation bands can effectively reduce the signal interference between adjacent ports, and can effectively shorten the long spacing required to avoid signal interference between adjacent ports, so as to effectively improve the space utilization inside the shell, thereby facilitating the reduction of the overall occupied space; the isolation degree can also be controlled within -20dB (that is, each mutual interference signal is controlled within a level of less than 1%), and it also has the advantage of excellent intermodulation, and different ports can be flexibly applied to different related fields.

[0011] According to a further configuration of the present invention, the monopole assembly includes a radiating element and a grounding element arranged adjacent to each other, wherein the radiating element is provided with a first branch for adjusting impedance and a first impedance adjustment section with a rectangular cross-section on the side close to the grounding element; the grounding element is provided with a second branch for adjusting impedance and a second impedance adjustment section with a trapezoidal cross-section on the side close to the radiating element; and the grounding element and the radiating element are both conductors.

[0012] By adopting the above technical solution, the connecting wire is a coaxial cable, the inner conductor of the connecting wire is connected to the grounding piece, and the outer conductor of the connecting wire is connected to the radiating piece; through the length of the lower rectangular base of the radiating piece, the length of the trapezoidal upper base of the grounding piece, and the spacing between the above two bases, it can be used to achieve impedance matching and the microstrip line commonly used in the design of monopole antennas can be discarded; by reducing the use of additional accessories, the present solution can obtain a more streamlined structure, the enterprise's production and processing operations are simpler, thereby facilitating the reduction of the enterprise's production and processing costs, and the overall appearance can be made thinner and lighter; it can also achieve ultra-wide frequency band radiation, thereby facilitating the improvement of antenna gain and intermodulation performance.

[0013] According to a further configuration of the present invention, the first impedance adjustment segment includes a first straight line segment for impedance adjustment, the second impedance adjustment segment includes a second straight line segment for impedance adjustment and close to the first straight line segment, and a gap is left between the first straight line segment and the second straight line segment.

[0014] According to a further configuration of the present invention, the length of the first straight line segment is 10 to 35 mm, the length of the second straight line segment is 10 to 50 mm, and the spacing is 0.5 to 3 mm.

[0015] According to a further configuration of the present invention, the number of the first branches is at least two, and the first branches are respectively arranged at two ends of the first impedance adjustment section along its extension direction.

[0016] According to a further configuration of the present invention, the number of the second branches is at least two, and the second branches are respectively arranged at two ends of the second impedance adjustment section along its extension direction.

[0017] By adopting the above technical solution, the first branch and its positional arrangement can further enhance the impedance adjustment effect of the first impedance adjustment section on the basis of the first straight section, thereby improving the gain and intermodulation performance of the antenna. The second branch and its positional arrangement can further enhance the impedance adjustment effect of the second impedance adjustment section on the basis of the second straight section, thereby improving the gain and intermodulation performance of the antenna.

[0018] In summary, the present invention has the following beneficial effects:

[0019] 1. It can achieve omnidirectional radiation with a relative bandwidth of nearly 200% between 100MHz and 20GHz, and can be used in more communication systems;

[0020] 2. The simultaneous setting of four ports is equivalent to four antennas, which can provide higher capacity for the system;

[0021] 3. The isolation zone set between adjacent ports can effectively reduce port isolation and reduce signal interference between adjacent ports;

[0022] 4. It can effectively improve the space utilization inside the shell, thereby reducing the overall space occupied;

[0023] 5. The structure is simple, making it easier to ensure product interoperability.

[0024] In general, the present invention achieves omnidirectional radiation with a relative bandwidth of nearly 200%, can be used in more communication systems, can effectively reduce signal interference between adjacent ports, can also facilitate and effectively improve the space utilization inside the shell, and has the advantage of good intermodulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of a MIMO omnidirectional antenna;

[0026] Figure 2 It is a schematic diagram of a half-section structure of a MIMO omnidirectional antenna;

[0027] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 This is another half-section structural diagram of a MIMO omnidirectional antenna;

[0029] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0030] Figure 6 It is a schematic diagram of the structure of a monopole component in a MIMO omnidirectional antenna;

[0031] Figure 7 It is a standing wave diagram when the number of monopole components in a MIMO omnidirectional antenna is one;

[0032] Figure 8 is an isolation diagram when the number of monopole components in a MIMO omnidirectional antenna is four;

[0033] Figure 9 It is a directional pattern of a monopole component.

[0034] Figure numerals: 1, radiating element; 2, grounding element; 31, first straight segment; 32, first branch; 4, second impedance adjustment segment; 41, second straight segment; 42, second branch; 6, shell; 7, monopole assembly; 8, isolation belt; 9, connecting line. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Example 1: A MIMO omnidirectional antenna, such as Figures 1 to 9 As shown, it includes a shell 6, in which at least two monopole assemblies 7 are arranged, and an isolation strip 8 is provided between adjacent monopole assemblies 7. Adjacent monopole assemblies 7 are arranged perpendicular to each other along the extension lines of their own polarization directions. Adjacent monopole assemblies 7 are arranged perpendicularly along the extension lines of their own polarization directions. The radiating element 1 and the grounding element 2 constitute the monopole assembly 7. The number of monopole assemblies 7 is at least two. An isolation device is provided between two adjacent monopole assemblies 7, and the axial direction of the two adjacent monopole assemblies 7 is 90 degrees. In this embodiment, the isolation device is an isolation strip 8. A spacing is left between the isolation strip 8 and the monopole assembly 7 to reduce the impact of the isolation strip 8 on the performance of the monopole assembly 7.

[0037] In this embodiment, there are four monopole assemblies 7. Adjacent isolation strips 8 intersect and combine to form a cross-shaped isolation strip 8. The isolation strip 8 has a length of 50 to 150 mm, a width of 0.1 to 30 mm, and a thickness of 0.1 to 30 mm. The isolation strip 8 is a conductor. Figure 7 It is a single-port standing wave diagram, where the horizontal coordinate is the frequency (in GHz) and the vertical coordinate is the standing wave ratio. Figure 8 It is a four-port standing wave diagram, where one monopole component 7 corresponds to one port; the horizontal coordinate is the frequency (in GHz), and the vertical coordinate is the isolation. Figure 9is the directional pattern of the monopole component 7, Figure 9 This is a conventional technical indicator diagram in the field of antenna technology in this technical field, and will not be described in detail here.

[0038] The number of four monopole components 7 can achieve omnidirectional radiation of four ports, and thus can achieve omnidirectional radiation of nearly 200% relative bandwidth between 100MHz and 20GHz, so as to improve the gain of the signal. Since the radiation of the signal is non-directional, the simultaneous setting of the four ports can ensure the radiation of the signal, and the cross isolation band 8 composed of four isolation bands 8 with a cross-shaped cross section can effectively reduce the signal interference between adjacent ports, and can effectively shorten the long spacing required to avoid signal interference between adjacent ports, so as to effectively improve the space utilization inside the shell 6, thereby facilitating the reduction of the space occupied by the whole, the structure is simple, and it is easier to ensure product intermodulation; the isolation can also be controlled within -20dB (that is, each mutual interference signal is controlled to a level within 1%), and it also has the advantage of excellent intermodulation, and different ports can be flexibly applied to different related fields. Through this embodiment, different ports can be unaffected by each other, and thus, while the multi-port omnidirectional radiation is achieved, the mutual interference of signals between adjacent ports can also be avoided.

[0039] like Figures 1 to 5 As shown, the monopole assembly 7 includes a connecting line 9 for digital transmission, and adjacent radiating elements 1 and grounding elements 2. The connecting line 9 is connected to the radiating element 1 and the grounding element 2, respectively. The radiating element 1 is provided with a first impedance adjustment section with a rectangular cross-section on the side near the grounding element 2; the grounding element 2 is provided with a second impedance adjustment section 4 with a trapezoidal cross-section on the side near the radiating element 1, and a gap is left between the first impedance adjustment section and the second impedance adjustment section 4. The first straight line segment 31 and the second straight line segment 41 are parallel to each other. The radiating element 1 is a radiating plate with an arc-shaped cross-section, and the grounding element 2 is a grounding plate with a rectangular cross-section. There is a polarization direction between the radiating element 1 and the grounding element 2, and this polarization direction is a conventional technical means in this technical field. The grounding element 2 and the radiating element 1 are both conductors.

[0040] The connecting line 9 is a coaxial cable, the inner conductor of the connecting line 9 is connected to the grounding part 2, the outer conductor of the connecting line 9 is connected to the radiating part 1, and the input end of the connecting line 9 corresponds to a port; through the length of the lower rectangular base of the radiating part 1, the length of the trapezoidal upper base of the grounding part 2, and the spacing between the above two bases, it can be used to achieve impedance matching and the microstrip line commonly used in the design of monopole antennas can be discarded; by reducing the use of additional accessories, the present solution can obtain a more streamlined structure, the enterprise's production and processing operations are simpler, thereby facilitating the reduction of the enterprise's production and processing costs, and the overall appearance can be made thinner and lighter; it can also achieve ultra-wide frequency band radiation, thereby facilitating the improvement of antenna gain and intermodulation performance.

[0041] The first impedance adjustment segment includes a first straight segment 31 for impedance adjustment. The second impedance adjustment segment 4 includes a second straight segment 41 for impedance adjustment, located adjacent to the first straight segment 31, with a spacing between the first and second straight segments 31 and 41. A first branch 32 for impedance adjustment is provided on the side of the first impedance adjustment segment on the radiating element 1. The first branch 32 is adjacent to and smoothly disposed on the first impedance adjustment segment. In this embodiment, there are two first branches 32, one at each end of the first impedance adjustment segment along its extension direction.

[0042] A second branch 42 for adjusting impedance is provided on the side of the second impedance adjustment section 4 on the grounding member 2 . The second branch 42 is adjacent to and smoothly arranged at the end of the second impedance adjustment section 4 along its own extension direction.

[0043] In this embodiment, the shape and arrangement of the first branch 32 can further enhance the impedance adjustment effect of the first impedance adjustment section on the basis of the first straight section 31, thereby improving the gain and intermodulation performance of the antenna. The shape and arrangement of the second branch 42 can further enhance the impedance adjustment effect of the second impedance adjustment section 4 on the basis of the second straight section 41, thereby improving the gain and intermodulation performance of the antenna.

[0044] In this embodiment, the first branch 32 is a raised portion with a rectangular cross-section, and there are two first branches 32 that are symmetrically arranged on both sides of the first impedance adjustment section; the second branch 42 is a cross-section of two connected rectangles with different heights from the side of the grounding member 2, and there are two second branches 42 that are symmetrically arranged on both sides of the second impedance adjustment section 4.

[0045] The length of the first straight segment 31 is 10 to 35 mm, the length of the second straight segment 41 is 10 to 50 mm, and the spacing is 0.5 to 3 mm. After abandoning the microstrip line commonly used in the design of monopole antennas, impedance matching can be achieved, so as to effectively achieve impedance adjustment, thereby facilitating the reduction of production and processing costs of enterprises, and making the overall appearance thinner and lighter; ultra-wideband radiation can also be achieved, thereby facilitating the improvement of antenna gain and intermodulation performance. The full name of the standing wave ratio is voltage standing wave ratio, which refers to the ratio of the standing wave antinode voltage to the trough voltage amplitude, also known as the standing wave coefficient or standing wave ratio. When the standing wave ratio is equal to 1, it means that the impedance of the feeder and the antenna is completely matched. At this time, all high-frequency energy is radiated by the antenna, and there is no energy reflection loss; when the standing wave ratio is infinite, it means total reflection, and no energy is radiated at all; after experimental data analysis, when the first straight segment 31, the second straight segment 41, and the spacing between the two are within the numerical range of this technical solution, a good standing wave ratio can be obtained.

[0046] The monopole assembly 7 and the isolation belt 8 are both fixed in the housing 6 , and the connecting wire 9 passes through the wire outlet hole on the housing 6 .

[0047] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A MIMO omnidirectional antenna, comprising a housing (6), characterized in that: At least four monopole components (7) are provided in the housing (6); isolation strips (8) for preventing mutual signal influence are provided between adjacent monopole components (7); adjacent monopole components (7) are arranged vertically along the extension lines of their own polarization directions; adjacent isolation strips (8) intersect and combine to form a cross isolation strip (8) with a cross-shaped cross section; the isolation strip (8) is a conductor; The monopole assembly (7) comprises a radiation element (1) and a grounding element (2) arranged adjacent to each other; the radiation element (1) is provided with a first branch (32) for adjusting impedance and a first impedance adjustment section (3) with a rectangular cross section on a side close to the grounding element (2); the grounding element (2) is provided with a second branch (42) for adjusting impedance and a second impedance adjustment section (4) with a trapezoidal cross section on a side close to the radiation element (1); the first impedance adjustment section (3) comprises a first straight section (31) for impedance adjustment; the second impedance adjustment section (4) comprises a second straight section (41) for impedance adjustment and close to the first straight section (31); a gap (5) is left between the first straight section (31) and the second straight section (41); the first straight section (31) and the second straight section (41) are parallel to each other; the first branch (32) is respectively provided at both ends of the first impedance adjustment section (3) in an extension direction; and the second branch (42) is respectively provided at both ends of the second impedance adjustment section (4) in an extension direction.

2. The MIMO omnidirectional antenna according to claim 1, wherein: The length of the isolation belt (8) is 50-150 mm, the width of the isolation belt (8) is 0.1-30 mm, and the thickness of the isolation belt (8) is 0.1-30 mm.

3. The MIMO omnidirectional antenna according to claim 1, wherein: The grounding element (2) and the radiating element (1) are both conductors.

4. The MIMO omnidirectional antenna according to claim 1, wherein: The length of the first straight line segment (31) is 10-35 mm, the length of the second straight line segment (41) is 10-50 mm, and the spacing (5) is 0.5-3 mm.

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