Ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feed

Abstract

The invention provides an ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feed, which relates to the technical field of antennas and comprises a dielectric substrate, a plurality of radiation units and a plurality of grounding planes, the radiation units and the grounding planes are equal in number and are arranged in a one-to-one correspondence manner. Each radiation unit is arranged on the upper surface of the dielectric substrate; each grounding plane is arranged on the lower surface of the dielectric substrate; the radiation units are orthogonally and vertically arranged in sequence; the radiation unit comprises a micro-strip feeder line and a radiator; the radiator comprises a first patch structure, a first semicircular patch and a second semicircular patch; the first patch structure comprises a third semicircular patch and a rectangular patch; the first end of the micro-strip feeder line is connected with the signal input port; and the second end of the microstrip feeder line is connected with the radiator. The problem of balance among miniaturization, broadband and high isolation of an existing antenna is solved, and the antenna has the advantages of being compact in size, wide in bandwidth coverage, excellent in isolation performance and the like.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and in particular to an ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding. Background Technology

[0002] As wireless communication technology rapidly evolves towards higher speeds, lower latency, and multi-scenario adaptability, Ultra-Wideband (UWB) technology, with its advantages of high data transmission rates, low power consumption, and strong anti-interference capabilities, has become a core supporting technology in fields such as indoor positioning, intelligent transportation, smart homes, and automotive radar. Combining UWB technology with Multiple-Input Multiple-Output (MIMO) technology can further enhance the channel capacity, data throughput, and multipath fading resistance of communication systems, meeting the urgent needs of short-range, high-speed wireless communication.

[0003] Currently, applications such as portable electronic devices and vehicle terminals are placing increasingly stringent demands on the miniaturization and integration of antennas. Simultaneously, antennas must possess ultra-wide impedance bandwidth and excellent port isolation performance to prevent signal interference caused by electromagnetic coupling between multiple antenna elements, thus affecting communication quality. However, existing UWB-MIMO antenna designs generally face three core challenges: first, the balance between miniaturization and wide bandwidth; traditional wideband antennas are complex in structure and large in size, making them difficult to adapt to compact devices; second, insufficient multi-port isolation performance, as electromagnetic coupling between adjacent antenna elements can easily lead to signal crosstalk, reducing system communication stability; and third, some decoupling structures (such as electromagnetic bandgap and complex defect grounding structures) suffer from design complexity, high manufacturing costs, or large space requirements, limiting their practical application scenarios.

[0004] While existing technologies employ methods such as L-shaped grounding stubs, T-shaped parasitic units, and fence-type decoupling structures to optimize isolation performance or broaden bandwidth, they often suffer from limitations such as limited bandwidth coverage, insignificant improvement in isolation (often less than 20dB compared to the L-shaped grounding stubs), and relatively large overall antenna size. Furthermore, while traditional coplanar waveguide (CPW) feeding structures can ensure signal transmission stability, they have limitations in miniaturization designs. ACPW feeding schemes, with their simplified structural layout, exhibit unique advantages in antenna miniaturization. However, how to organically combine them with efficient decoupling structures and broadband radiating units to achieve synergistic optimization of "miniaturization + ultra-wideband + high isolation" remains a key challenge in current technology development. Summary of the Invention

[0005] The purpose of this invention is to provide an ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding, which solves the problem of balancing miniaturization, wide bandwidth and high isolation in existing antennas, and has the advantages of compact size, wide bandwidth coverage and excellent isolation performance.

[0006] An ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding includes: a dielectric substrate, several radiating elements, and several ground planes. The number of radiating units and the number of grounding planes are equal and they are arranged in a one-to-one correspondence; each of the radiating units is disposed on the upper surface of the dielectric substrate; each of the grounding planes is disposed on the lower surface of the dielectric substrate. Each of the aforementioned radiating units is arranged orthogonally and perpendicularly in sequence; The radiating unit includes a microstrip feed line and a radiator; The radiator includes a first patch structure, a first semicircular patch, and a second semicircular patch; the first patch structure includes a third semicircular patch and a rectangular patch. The straight edge of the third semicircular patch is connected to the first long edge of the rectangular patch; the length of the first long edge of the rectangular patch is greater than the length of the straight edge of the third semicircular patch. Both the first short side and the second short side of the rectangular patch are arc-shaped. The first patch structure has a first rectangular groove and a second rectangular groove; the length of the first rectangular groove is greater than the length of the second rectangular groove; The first long side of the first rectangular groove is connected to the second long side of the rectangular patch; the second rectangular groove is connected to the second long side of the first rectangular groove; The straight edge of the first semicircular patch connects to the second long edge of the rectangular patch and overlaps with the first long edge of the first rectangular groove; the straight edge of the second semicircular patch connects to the second long edge of the rectangular patch and overlaps with the second long edge of the first rectangular groove. The first end of the microstrip feed line is connected to the signal input port; the signal input port is fed by an asymmetric coplanar waveguide; the second end of the microstrip feed line is connected to the radiator.

[0007] Optionally, the radiating unit further includes a first parasitic patch; The first parasitic patch is disposed below the microstrip feed line; The first parasitic patch is spaced a first predetermined distance from the second rectangular groove; the first parasitic patch is spaced a second predetermined distance from the grounding plane in the vertical direction.

[0008] Optionally, the microstrip feed line includes a first feed line and a second feed line; The first feeder line and the second feeder line are connected perpendicularly; The first feed lines are all connected to the radiator; the second feed line is connected to the signal input port; the signal input port is fed by an asymmetric coplanar waveguide. The first parasitic patch is disposed below the second feeder wire.

[0009] Optionally, the radiating unit further includes a second parasitic patch, which is connected to the first feed line and the second feed line respectively; The first parasitic patch is disposed below the second feed line and the second parasitic patch.

[0010] Optionally, both the first rectangular groove and the second rectangular groove are symmetrically arranged along the long side of the rectangular patch.

[0011] Optionally, the first semicircular patch and the second semicircular patch are symmetrically arranged along the long side of the rectangular patch.

[0012] Optionally, the grounding plane includes a first rectangular plane, a second rectangular plane, and a third rectangular plane; The first rectangular plane, the second rectangular plane, and the third rectangular plane are connected in sequence; the edges of the first rectangular plane, the second rectangular plane, and the third rectangular plane near the microstrip feed line are collinear, and the first rectangular plane, the second rectangular plane, and the third rectangular plane are in a stepped shape; The first parasitic patch is set at a second predetermined distance from the first rectangular plane in the vertical direction.

[0013] Optionally, the first semicircular patch and the second semicircular patch are the same size; the diameter of the third semicircular patch is larger than the diameter of the first semicircular patch.

[0014] Optionally, a decoupling unit is provided between each of the radiation units; The decoupling unit includes a first rectangular decoupling plate, a second rectangular decoupling plate, a third rectangular decoupling plate, a fourth rectangular decoupling plate, a fifth rectangular decoupling plate, and a sixth rectangular decoupling plate; The second rectangular decoupling piece is connected to the top edge of the first rectangular decoupling piece; The third rectangular decoupling piece and the fourth rectangular decoupling piece are both connected to the first side of the first rectangular decoupling piece; the fifth rectangular decoupling piece and the sixth rectangular decoupling piece are both connected to the first side of the second rectangular decoupling piece; The third rectangular decoupling plate and the fifth rectangular decoupling plate are symmetrically arranged along the first rectangular decoupling plate; the fourth rectangular decoupling plate and the sixth rectangular decoupling plate are symmetrically arranged along the first rectangular decoupling plate.

[0015] Optionally, the first parasitic patch includes a first rectangular parasitic patch and a second rectangular parasitic patch; The length of the first rectangular parasitic patch is greater than the length of the second rectangular parasitic patch; The first rectangular parasitic patch and the second rectangular parasitic patch are perpendicularly connected; The first rectangular parasitic patch is spaced apart from the second rectangular slot by a predetermined distance; the first rectangular parasitic patch is spaced apart from the grounding plane by a predetermined distance in the vertical direction.

[0016] Beneficial effects: This invention relates to an ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding, with an antenna impedance bandwidth of 4.19GHz-16.93GHz, effectively covering part of the C-band, the entire X-band, and part of the Ku-band. It can meet the multi-scenario requirements of ultra-wideband communication and is compatible with the frequency band requirements of different applications such as vehicle radar, indoor positioning, and smart homes.

[0017] This invention is based on an ultra-wideband multi-port MIMO antenna fed by an asymmetric coplanar waveguide. Through the synergistic effect of orthogonal arrangement, pier-shaped firewall-type decoupling structure, F / L-shaped parasitic patch and stepped ground plane, the isolation between ports is greater than 20dB and the envelope correlation coefficient (ECC) is less than 0.0027 across the entire frequency band. This effectively suppresses electromagnetic crosstalk between multiple elements and ensures communication stability and signal quality.

[0018] This invention is based on an ultra-wideband multi-port MIMO antenna fed by an asymmetric coplanar waveguide. It adopts an ACPW feeding scheme and a compact orthogonal arrangement design, which has a simple structure and is easy to integrate into products with strict space constraints, such as portable devices and vehicle terminals, while reducing manufacturing costs and assembly difficulty.

[0019] This invention relates to an ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding, which has a full-band radiation efficiency of over 75%, a peak radiation efficiency of up to 96.7%, and a maximum peak gain of 6.6 dBi (at 12.2 GHz). At representative frequencies such as 5.22 GHz, 10.5 GHz, 13.6 GHz, and 15.68 GHz, the radiation pattern meets the requirements for directional or omnidirectional coverage, has good spatial diversity capability, and is suitable for complex multipath communication environments.

[0020] This invention relates to an ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding. The total active reflection coefficient (TARC) is below -30dB throughout the entire operating frequency band, indicating that the antenna has stable impedance matching performance when working in multi-port cooperative mode, ensuring overall communication efficiency and reliability. Attached Figure Description

[0021] Figure 1 This is an overall diagram of the ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to the present invention; Figure 2 This is a top view of the ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to the present invention; Figure 3 This is a simulation diagram of the S-parameters of the ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to the present invention; Figure 4 This is a comparison of the simulated and measured radiation directions of the ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to the present invention at 5.22 GHz; Figure 5 This is a comparison of the simulated and measured radiation directions of the ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to the present invention at 10.5 GHz. Figure 6 This is a comparison of the simulated and measured radiation directions of the ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to the present invention at 13.6 GHz. Figure 7 This is a comparison of the simulated and measured radiation directions of the ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to the present invention at 15.68 GHz. Figure 8 This is a schematic diagram of the peak gain of the ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to the present invention. Figure 9 This is a graph showing the radiation efficiency of the ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to the present invention.

[0022] In the diagram: 1. Dielectric substrate; 2. Radiation unit; 3. Ground plane; 4. Microstrip feed line; 5. Radiator; 6. First patch structure; 7. First semi-circular patch; 8. Second semi-circular patch; 9. Third semi-circular patch; 10. Rectangular patch; 11. First rectangular slot; 12. Second rectangular slot; 13. First parasitic patch; 14. Second parasitic patch; 15. First feed line; 16. Second feed line; 17. Decoupling unit; 18. First rectangular decoupling plate; 19. Second rectangular decoupling plate; 20. Third rectangular decoupling plate; 21. Fourth rectangular decoupling plate; 22. Fifth rectangular decoupling plate; 23. Sixth rectangular decoupling plate; 24. First rectangular parasitic patch; 25. Second rectangular parasitic patch; 26. Third rectangular parasitic patch; 27. Fourth rectangular parasitic patch; 28. Fifth rectangular parasitic patch. Detailed Implementation

[0023] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0024] Figure 1 This is an overall diagram of the ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to the present invention; Figure 2 This is a top view of the ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to the present invention; as shown... Figure 1 and Figure 2As shown, the present invention provides an ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding, which includes: a dielectric substrate 1, a plurality of radiating elements 2 and a plurality of ground planes 3.

[0025] The number of radiating elements 2 and ground planes 3 are equal and arranged in a one-to-one correspondence; each radiating element 2 is disposed on the upper surface of the dielectric substrate 1; each ground plane 3 is disposed on the lower surface of the dielectric substrate 1. Preferably, the dielectric substrate 1 is a 1.6mm thick FR4 substrate, the overall size of the dielectric substrate 1 is 40mm×40mm, the relative permittivity of the dielectric substrate 1 is 4.4, and the loss tangent is 0.02, providing stable support and electromagnetic transmission environment for the antenna.

[0026] Preferably, in this embodiment, there are four radiating elements 2 and four grounding planes 3.

[0027] Preferably, the grounding plane 3 includes a first rectangular plane, a second rectangular plane, and a third rectangular plane.

[0028] The first rectangular plane, the second rectangular plane, and the third rectangular plane are connected in sequence; the edges of the first rectangular plane, the second rectangular plane, and the third rectangular plane are collinear with respect to the microstrip feed line 4, and the first rectangular plane, the second rectangular plane, and the third rectangular plane are in a stepped shape.

[0029] Specifically, the lengths of the first rectangular plane, the second rectangular plane, and the third rectangular plane are all 2.45 mm. This layout effectively controls the surface current distribution in the low-frequency band, enhances the antenna's radiation performance in low-frequency bands such as 5.7 GHz, and further weakens the low-frequency coupling between the radiating elements 2, ensuring full-band isolation.

[0030] Each radiating element 2 is arranged orthogonally and perpendicularly in sequence to achieve spatial diversity and reduce natural electromagnetic coupling.

[0031] Radiation unit 2 includes microstrip feed line 4 and radiator 5.

[0032] The radiator 5 includes a first patch structure 6, a first semicircular patch 7, and a second semicircular patch 8; the first patch structure 6 includes a third semicircular patch 9 and a rectangular patch 10. Preferably, the first semicircular patch 7 and the second semicircular patch 8 are the same size; the diameter of the third semicircular patch 9 is larger than the diameter of the first semicircular patch 7.

[0033] The straight edge of the third semicircular patch 9 is connected to the first long edge of the rectangular patch 10; the length of the first long edge of the rectangular patch 10 is greater than the length of the straight edge of the third semicircular patch 9.

[0034] Both the first short side and the second short side of the rectangular patch 10 are arc-shaped.

[0035] The first patch structure 6 has a first rectangular groove 11 and a second rectangular groove 12; the length of the first rectangular groove 11 is greater than the length of the second rectangular groove 12.

[0036] The first long side of the first rectangular slot 11 is connected to the second long side of the rectangular patch 10; the second rectangular slot 12 is connected to the second long side of the first rectangular slot 11. The first rectangular slot 11 and the second rectangular slot 12 can change the current path, introduce additional inductance and capacitance effects, stimulate high-frequency resonant modes, and extend the high-frequency operating bandwidth of the antenna.

[0037] The slot structure has a height of 3mm, a slot width of 6.4mm, and a transition section length of 0.8mm at the top of the slot wall. By using the above precisely designed dimensional parameters, the current path on the antenna surface is changed, the current transmission length is extended, and additional inductance and capacitance effects are introduced to excite high-frequency resonant modes such as 14.9GHz and 16.5GHz, effectively expanding the high-frequency operating bandwidth of the antenna and ensuring ultra-wideband full-band coverage as the preferred option.

[0038] The straight edge of the first semicircular patch 7 connects to the second long side of the rectangular patch 10 and overlaps with the first long side of the first rectangular groove 11; the straight edge of the second semicircular patch 8 connects to the second long side of the rectangular patch 10 and overlaps with the second long side of the first rectangular groove 11. Preferably, the first rectangular groove 11 and the second rectangular groove 12 are both symmetrically arranged along the long side of the rectangular patch 10. The first semicircular patch 7 and the second semicircular patch 8 are symmetrically arranged along the long side of the rectangular patch 10.

[0039] Specifically, the radiation unit 2 also includes a first parasitic patch 13 and a second parasitic patch 14.

[0040] The first parasitic patch 13 is positioned below the microstrip feed line 4.

[0041] The first parasitic patch 13 is spaced a first predetermined distance from the second rectangular slot 12; the first parasitic patch 13 is spaced a second predetermined distance from the grounding plane 3 in the vertical direction. The first parasitic patch 13 is spaced a second predetermined distance from the first rectangular plane in the vertical direction.

[0042] The second parasitic patch 14 is connected to the first feeder wire 15 and the second feeder wire 16 respectively.

[0043] The first parasitic patch 13 is disposed below the second feeder wire 16 and the second parasitic patch 14.

[0044] Preferably, the first parasitic patch 13 includes a first rectangular parasitic patch 24 and a second rectangular parasitic patch 25.

[0045] The length of the first rectangular parasitic patch 24 is greater than the length of the second rectangular parasitic patch 25.

[0046] The first rectangular parasitic patch 24 and the second rectangular parasitic patch 25 are perpendicularly connected.

[0047] The first rectangular parasitic patch 24 is spaced apart from the second rectangular slot 12 by a first predetermined distance; the first rectangular parasitic patch 24 is spaced apart from the grounding plane 3 by a second predetermined distance in the vertical direction.

[0048] Preferably, the width of the first rectangular parasitic patch 24 and the second rectangular parasitic patch 25 are both 0.685 mm, the length of the first rectangular parasitic patch 24 is 4.74 mm, and the length of the second rectangular parasitic patch 25 is 1.58 mm. The first preset distance is set to 1.5 mm, and the second preset distance is 0.6 mm.

[0049] Specifically, the first parasitic patch 13 is L-shaped. By adjusting the effective dielectric constant and length, the first parasitic patch 13 optimizes the high-frequency current return path, thereby further improving the high-frequency isolation performance and radiation efficiency.

[0050] Furthermore, the second parasitic patch 14 is F-shaped, specifically including a third rectangular parasitic patch 26, a fourth rectangular parasitic patch 27, and a fifth rectangular parasitic patch 28.

[0051] The fourth rectangular parasitic patch 27 and the fifth rectangular parasitic patch 28 are both set perpendicular to the third rectangular parasitic patch 26.

[0052] The first end of the third rectangular parasitic patch 26 is connected to the microstrip feed line 4, the second end of the third rectangular parasitic patch 26 is connected to the first end of the fourth rectangular parasitic patch 27, the second ends of the fourth rectangular parasitic patch 27 and the fifth rectangular parasitic patch 28 are both connected to the microstrip feed line 4, and the first end of the fifth rectangular parasitic patch 28 is connected to the third rectangular parasitic patch 26.

[0053] The second parasitic patch 14 is used to extend the current path and deepen the impedance dip at the resonant frequency.

[0054] The first end of microstrip feed line 4 is connected to the signal input port; the signal input port is fed by an asymmetric coplanar waveguide; the second end of microstrip feed line 4 is connected to the radiator 5. The asymmetric coplanar waveguide feeding enables the miniaturization of the antenna and its ultra-wideband performance.

[0055] Furthermore, the microstrip feeder 4 includes a first feeder line 15 and a second feeder line 16.

[0056] The first feeder line 15 and the second feeder line 16 are connected perpendicularly.

[0057] The first feed line 15 is connected to the radiator 5; the second feed line 16 is connected to the signal input port; the signal input port adopts asymmetric coplanar waveguide feeding; the second feed line 16 is trapezoidal, with a waist length of 2.75mm, an upper base width of 0.8mm, and a lower base width of 3.45mm.

[0058] The first parasitic patch 13 is disposed below the second feeder line 16.

[0059] Specifically, each radiation unit 2 is provided with a decoupling unit 17. The decoupling unit 17 includes a first rectangular decoupling plate 18, a second rectangular decoupling plate 19, a third rectangular decoupling plate 20, a fourth rectangular decoupling plate 21, a fifth rectangular decoupling plate 22, and a sixth rectangular decoupling plate 23.

[0060] The second rectangular decoupling piece 19 is connected to the top edge of the first rectangular decoupling piece 18.

[0061] The third rectangular decoupling piece 20 and the fourth rectangular decoupling piece 21 are both connected to the first side of the first rectangular decoupling piece 18; the fifth rectangular decoupling piece 22 and the sixth rectangular decoupling piece 23 are both connected to the first side of the second rectangular decoupling piece 19.

[0062] The third rectangular decoupling plate 20 and the fifth rectangular decoupling plate 22 are symmetrically arranged along the first rectangular decoupling plate 18; the fourth rectangular decoupling plate 21 and the sixth rectangular decoupling plate 23 are symmetrically arranged along the first rectangular decoupling plate 18.

[0063] The decoupling unit 17 adopts a pier-shaped design. By changing the surface current path and distribution, the decoupling unit 17 introduces a phase cancellation mechanism to suppress electromagnetic coupling between the radiating units 2 and improve port isolation.

[0064] The length of the third rectangular decoupling plate 20, the fourth rectangular decoupling plate 21, the fifth rectangular decoupling plate 22, and the sixth rectangular decoupling plate 23 are all 4.4 mm and the width is 1.4 mm.

[0065] The vertical distance between the first rectangular decoupling plate 18 and the radiating unit 2 is 1.0 mm, and the horizontal vertical distance between them is 0.7 mm. The length of the first rectangular decoupling plate 18 is 10.4 mm, and the width is 1.1 mm. The length of the second rectangular decoupling plate 19 is 3.0 mm. Through the above precise numerical dimensions and layout design, the decoupling unit 17 effectively changes the surface current path and distribution between adjacent radiating units 2, stably introducing a phase cancellation mechanism in the cross-shaped region, making the coupling signals of adjacent radiating units 2 opposite in phase and canceling each other out, significantly suppressing electromagnetic coupling between units.

[0066] Specifically, the antenna of this invention was simulated and debugged using the electromagnetic simulation software ANSYS Electronics Desktop 2021.2. The S-parameter results are as follows: Figure 3 As shown, from Figure 3 As can be seen, the simulation results fully cover the 4.19GHz-16.93GHz frequency band.

[0067] like Figure 4 , Figure 5 , Figure 6 and Figure 7 The radiation patterns of the antenna of this invention at four typical frequency points: 5.22 GHz, 10.5 GHz, 13.6 GHz, and 15.68 GHz are presented. From low frequency to high frequency, the radiation characteristics gradually transition from narrow beam directional and omnidirectional coverage to wide beam coverage exceeding 120°, which can meet the requirements of positioning and multi-user access, as well as adapt to MIMO spatial diversity. The measured and simulated results show a high degree of agreement, confirming the stable and reliable radiation performance of the antenna.

[0068] Figure 8 The antenna of this invention demonstrates its peak gain performance across the entire frequency band (4.19GHz-16.93GHz). The gain output is stable without significant fluctuations, reaching a maximum of 6.6dBi at 12.2GHz. It can maintain considerable signal radiation intensity in all frequency bands, providing sufficient signal transmission strength to support short-range high-speed communication in UWB-MIMO systems.

[0069] Figure 9 The radiation efficiency characteristics of the antenna of this invention are presented. In the ultra-wide frequency band of 4.19GHz-16.93GHz, the radiation efficiency is always maintained above 75% without significant drop, and the peak efficiency is as high as 96.7%. The energy conversion efficiency is excellent, which effectively reduces energy loss in the signal transmission process and ensures the high efficiency of UWB-MIMO system communication.

[0070] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding, characterized in that, It includes: A dielectric substrate, several radiating elements, and several grounding planes; The number of the radiating elements and the grounding plane are equal and they are arranged in a one-to-one correspondence. Each of the aforementioned radiating units is disposed on the upper surface of the dielectric substrate; Each of the aforementioned grounding planes is disposed on the lower surface of the dielectric substrate; Each of the aforementioned radiating units is arranged orthogonally and perpendicularly in sequence; The radiating unit includes a microstrip feed line and a radiator; The radiator includes a first patch structure, a first semicircular patch, and a second semicircular patch; the first patch structure includes a third semicircular patch and a rectangular patch. The straight edge of the third semicircular patch is connected to the first long edge of the rectangular patch; the length of the first long edge of the rectangular patch is greater than the length of the straight edge of the third semicircular patch. Both the first short side and the second short side of the rectangular patch are arc-shaped. The first patch structure has a first rectangular groove and a second rectangular groove; the length of the first rectangular groove is greater than the length of the second rectangular groove; The first long side of the first rectangular groove is connected to the second long side of the rectangular patch; the second rectangular groove is connected to the second long side of the first rectangular groove; The straight edge of the first semicircular patch connects to the second long edge of the rectangular patch and overlaps with the first long edge of the first rectangular groove; the straight edge of the second semicircular patch connects to the second long edge of the rectangular patch and overlaps with the second long edge of the first rectangular groove. The first end of the microstrip feed line is connected to the signal input port; the signal input port is fed by an asymmetric coplanar waveguide; the second end of the microstrip feed line is connected to the radiator.

2. The ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to claim 1, characterized in that, The radiating unit also includes a first parasitic patch; The first parasitic patch is disposed below the microstrip feed line; The first parasitic patch is spaced a first predetermined distance from the second rectangular groove; the first parasitic patch is spaced a second predetermined distance from the grounding plane in the vertical direction.

3. The ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to claim 2, characterized in that, The microstrip feed line includes a first feed line and a second feed line. The first feeder line and the second feeder line are connected perpendicularly; The first feed lines are all connected to the radiator; the second feed line is connected to the signal input port; the signal input port is fed by an asymmetric coplanar waveguide. The first parasitic patch is disposed below the second feeder wire.

4. The ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to claim 3, characterized in that, The radiating unit further includes a second parasitic patch, which is connected to the first feed line and the second feed line respectively; The first parasitic patch is disposed below the second feed line and the second parasitic patch.

5. The ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to claim 1, characterized in that, Both the first rectangular groove and the second rectangular groove are symmetrically arranged along the long side of the rectangular patch.

6. The ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to claim 1, characterized in that, The first semicircular patch and the second semicircular patch are symmetrically arranged along the long side of the rectangular patch.

7. The ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to claim 2, characterized in that, The grounding plane includes a first rectangular plane, a second rectangular plane, and a third rectangular plane; The first rectangular plane, the second rectangular plane, and the third rectangular plane are connected in sequence; the edges of the first rectangular plane, the second rectangular plane, and the third rectangular plane near the microstrip feed line are collinear, and the first rectangular plane, the second rectangular plane, and the third rectangular plane are in a stepped shape; The first parasitic patch is set at a second predetermined distance from the first rectangular plane in the vertical direction.

8. The ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to claim 1, characterized in that, The first semicircular patch and the second semicircular patch are the same size; the diameter of the third semicircular patch is larger than the diameter of the first semicircular patch.

9. The ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to claim 1, characterized in that, A decoupling unit is provided between each of the aforementioned radiation units; The decoupling unit includes a first rectangular decoupling plate, a second rectangular decoupling plate, a third rectangular decoupling plate, a fourth rectangular decoupling plate, a fifth rectangular decoupling plate, and a sixth rectangular decoupling plate; The second rectangular decoupling piece is connected to the top edge of the first rectangular decoupling piece; The third rectangular decoupling piece and the fourth rectangular decoupling piece are both connected to the first side of the first rectangular decoupling piece; the fifth rectangular decoupling piece and the sixth rectangular decoupling piece are both connected to the first side of the second rectangular decoupling piece; The third rectangular decoupling plate and the fifth rectangular decoupling plate are symmetrically arranged along the first rectangular decoupling plate; the fourth rectangular decoupling plate and the sixth rectangular decoupling plate are symmetrically arranged along the first rectangular decoupling plate.

10. The ultra-wideband multi-port MIMO antenna based on asymmetric coplanar waveguide feeding according to claim 2, characterized in that, The first parasitic patch includes a first rectangular parasitic patch and a second rectangular parasitic patch; The length of the first rectangular parasitic patch is greater than the length of the second rectangular parasitic patch; The first rectangular parasitic patch and the second rectangular parasitic patch are perpendicularly connected; The first rectangular parasitic patch is spaced apart from the second rectangular slot by a predetermined distance; the first rectangular parasitic patch is spaced apart from the grounding plane by a predetermined distance in the vertical direction.

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