Dual polarized omni-directional room division antenna

Abstract

The application relates to the technical field of wireless communication, and discloses a dual-polarization omni-directional indoor antenna, which comprises a first horizontal polarization unit, a vertical polarization unit and a second horizontal polarization unit, wherein the first horizontal polarization unit is composed of a first power divider arranged on the upper and lower surfaces of a first substrate and a first radiation unit, the second horizontal polarization unit is composed of a second power divider arranged on the two sides of a second substrate and a second radiation unit, and the vertical polarization unit is a metal radiator with a tapered structure at the lower end and arranged on the first substrate. The two horizontal polarization units are connected through a combiner, one of the two horizontal polarization units covers a 1.7-3.8 GHz frequency band, the other covers a 4.8-5.0 GHz frequency band, and the vertical polarization unit can cover a 1.5-5.5 GHz full frequency band, so that the indoor antenna has a wide bandwidth, high gain and good omni-directional performance.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and more specifically, to a dual-polarized omnidirectional indoor antenna. Background Technology

[0002] With the large-scale commercialization of 5G, the application of 5G antennas is becoming increasingly widespread. Indoor distributed antennas are needed for signal transmission when accessing the internet indoors and in underground parking lots. Currently, the design of indoor distributed antennas, in addition to providing 5G signal coverage, must also achieve backward compatibility with 2G / 3G / LTE frequency bands. Therefore, developing antennas capable of simultaneously covering multiple frequency bands has excellent application prospects. Indoor distributed antennas need to radiate electromagnetic waves in all directions so that every receiver can receive a good signal; therefore, the antenna needs to have omnidirectional radiation characteristics, and the antenna gain cannot be too low.

[0003] Currently, when implementing dual polarization in indoor distributed antennas, it typically consists of two omnidirectional unit structures: vertical polarization and horizontal polarization. Generally, vertical polarization can effectively achieve multi-frequency broadband characteristics using a conical shape and its deformable structures. However, for horizontal polarization, ensuring that the antenna simultaneously covers multiple frequency bands and guarantees corresponding bandwidth in each band presents a challenge. Simultaneously, achieving high omnidirectional gain while maintaining good omnidirectional radiation performance while ensuring coverage of multiple frequency bands is also a challenge. Furthermore, the welding and fixing of dual-polarized antennas are also issues that cannot be ignored during antenna design. Summary of the Invention

[0004] The present invention provides a dual-polarized omnidirectional indoor antenna to solve all or some of the above-mentioned problems.

[0005] To achieve the above objectives, the present invention provides a dual-polarized omnidirectional indoor distributed antenna, comprising: a first horizontal polarization unit, including a first power divider and a first radiating unit respectively disposed on the upper and lower surfaces of a first substrate, wherein the first radiating unit is a dipole patch symmetrically arranged at four corners, the first power divider includes four first feed branches facing the dipole patches, and the first substrate is further provided with a first feed port penetrating the body and connected to the input terminal of the first power divider; a vertical polarization unit, being a metal radiator with a tapered structure at its lower end, the lower end of which is disposed on the first substrate, and the first substrate is provided with a third feed port penetrating the body and connected to the metal radiator; a second horizontal polarization unit, disposed above the first substrate, including a second power divider and a second radiating unit respectively disposed on both sides of a second substrate, wherein the second radiating unit is two radiating patches in the shape of a "Tai Chi diagram", the second power divider includes four second feed branches symmetrically arranged at four corners and facing the radiating patches, the second substrate is further provided with a second feed port penetrating the body and connected to the input terminal of the second power divider, and a support post is further provided between the second substrate and the first substrate.

[0006] Preferably, strip-shaped patches are also provided between adjacent dipole patches.

[0007] Preferably, the outer periphery of the first radiating unit is symmetrically provided with eight first guiding units; the first guiding unit is two or more arc-shaped radiating patches arranged in a fan shape.

[0008] Preferably, the first guiding unit is arranged facing the strip patch and the dipole patch respectively.

[0009] Preferably, the first power supply branch has a bent structure.

[0010] Preferably, the vertical polarization unit includes a first metal sheet and a second metal sheet that are perpendicular to each other and have a tapered lower end. The first metal sheet has a first groove in the middle of its upper side, and the second metal sheet has a second groove in the middle of its lower side. The second metal sheet is inserted into the first groove, and the first metal sheet is inserted into the second groove.

[0011] Preferably, four or more third slots are symmetrically arranged at the edge of the second radiating unit.

[0012] Preferably, the outer periphery of the second radiating unit is symmetrically provided with eight second guiding units; the second guiding unit is two or more arc-shaped radiating patches arranged in a fan shape.

[0013] Preferably, there are eight third slots, which are respectively arranged facing the second guiding unit.

[0014] Preferably, the end of the second power supply branch is arc-shaped and is respectively arranged facing the two third slots.

[0015] Based on the above description and practical application, the dual-polarized omnidirectional indoor distributed antenna of this invention possesses multi-frequency and wide-bandwidth characteristics. Two horizontal polarization units are connected via a combiner, one covering a bandwidth of 1.7-3.8 GHz and the other covering the 4.8-5.0 GHz band. The vertical polarization unit can cover the entire 1.5-5.5 GHz band, enabling the dual-polarized omnidirectional indoor distributed antenna to simultaneously and completely cover the 1.71-2.69 GHz band and the 3.3-3.8 and 4.8-5.0 GHz bands of 5G Sub-6G, for a total of three main communication frequency bands. This indoor distributed antenna has significant advantages in extending the 5G band and being backward compatible with 2G / 3G / LTE bands, solving the bandwidth coverage problem of dual-polarized indoor distributed antennas. Furthermore, this dual-polarized omnidirectional indoor distributed antenna possesses high gain performance, maximizing the gain of the horizontal polarization unit while ensuring omnidirectional performance meets requirements. In addition, by adding eight directional elements around the second horizontal polarization unit above, the gain in the 4.8-5.0 GHz band is increased by 0.7-1.5 dBi compared to the original, and the omnidirectional performance of the antenna is also improved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a dual-polarized omnidirectional indoor antenna according to one embodiment of the present invention.

[0017] Figure 2 This is an exploded structural diagram of the vertical polarization unit in a dual-polarized omnidirectional indoor antenna according to one embodiment of the present invention.

[0018] Figure 3 This is a planar schematic diagram of the first horizontal polarization unit in a dual-polarized omnidirectional indoor antenna according to one embodiment of the present invention.

[0019] Figure 4 This is a planar schematic diagram of the second horizontal polarization unit in a dual-polarized omnidirectional indoor antenna according to one embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram illustrating the performance of a horizontal polarization unit in one embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the non-circularity of a horizontally polarized unit involved in one embodiment of the present invention.

[0022] Figure 7 This is a gain comparison diagram of the second horizontal polarization unit with and without the guiding unit in one embodiment of the present invention.

[0023] Figure 8 This is a schematic diagram illustrating the performance of a vertical polarization unit in one embodiment of the present invention.

[0024] Figure 9 This is a schematic diagram of the non-circularity of a vertically polarized unit in one embodiment of the present invention.

[0025] Figure 10 The H-plane and E-plane radiation patterns of a dual-polarized omnidirectional indoor antenna at 2.2 GHz, 3.5 GHz, and 4.9 GHz, according to one embodiment of the present invention.

[0026] The attached figures are labeled as follows:

[0027] 1. First horizontal polarization unit; 11. First power divider; 12. First radiating unit; 13. First feed branch; 14. First feed port; 15. Strip patch; 16. First guiding unit; 2. Vertical polarization unit; 21. First metal sheet; 22. Second metal sheet; 23. First slot; 24. Second slot; 25. Third feed port; 3. Second horizontal polarization unit; 31. Second power divider; 32. Second radiating unit; 33. Second feed branch; 34. Second feed port; 35. Third slot; 36. Second guiding unit; 41. First substrate; 42. Second substrate; 5. Support post. Detailed Implementation

[0028] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0029] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. It should be noted that in this disclosure, the terms "comprising," "configured with," and "set in" are used to indicate an open-ended inclusion, meaning that additional elements / components / etc. may exist besides those listed; the terms "first," "second," etc., are used only as labels and are not intended to limit the number or order of objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0030] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] This embodiment discloses a dual-polarized omnidirectional indoor antenna. Figure 1 The three-dimensional structure of the dual-polarized omnidirectional indoor antenna is shown. The structure of the blocked part is shown in the figure in the form of dashed lines, which mainly includes the first radiating element and the second radiating element. Figure 2 The exploded structure of the vertical polarization unit in this dual-polarization omnidirectional indoor antenna is shown; Figure 3 The planar structure of the first horizontally polarized unit in the dual-polarized omnidirectional indoor antenna is shown, and the structure of the first power divider is shown in the figure in the form of dashed lines. Figure 4 The planar structure of the second horizontal polarization unit in this dual-polarized omnidirectional indoor antenna is shown, and the structure of the second power divider is shown in the figure in the form of dashed lines.

[0032] Please refer to Figures 1 to 4The dual-polarized omnidirectional indoor antenna consists of a first horizontal polarization unit 1, a vertical polarization unit 2, and a second horizontal polarization unit 3, from bottom to top. The first horizontal polarization unit 1 covers the low-frequency band (1.7-3.8GHz), i.e., the 2G / 3G / LTE band; the second horizontal polarization unit 3 covers the high-frequency band (4.8-5.0GHz), i.e., the 5G band; and the vertical polarization unit 2 can cover all 2G / 3G / LTE / 5G bands. Ultimately, the three antenna units achieve dual-polarized signal coverage of the 2G / 3G / LTE / 5G bands.

[0033] Please combine Figure 1 and Figure 3 The first horizontal polarization unit 1 is disposed on the first substrate 41, which is an FR-4 plate with a radius of 70 mm, a thickness of 0.8 mm, a dielectric constant of 4.4, and a loss tangent of 0.02. The first horizontal polarization unit 1 includes a first power divider 11 and a first radiating unit 12. The first power divider 11 is disposed on... Figure 1 The first radiating unit 12 is disposed on the upper surface of the first substrate 41. Figure 1 The lower surface of the first substrate 41. The first radiating unit 12 is a dipole patch symmetrically arranged at four corners, see details. Figure 3 Each dipole patch has two branches pointing in opposite directions at its front end. These branches can form a discontinuous ring structure, giving the first radiating unit 12 better omnidirectional radiation performance. The input of the first power divider 11 is a branch connected to the first feed port 14, and the output is four first feed branches 13 facing the dipole patches. The first feed branches 13 and the dipole patches are located on opposite sides of the first substrate 41. The first feed port 14 penetrates the first substrate 41. In use, one end of the feed line is connected to the first feed port 14, the inner conductor is connected to the input of the first power divider 11, and the outer conductor is connected to the dipole patch. The first feed branches 13 and the dipole patches are connected through coupling. This first horizontal polarization unit 1 can achieve signal coverage of 2G / 3G / LTE frequency bands and has good omnidirectional performance.

[0034] Please combine Figure 1 and Figure 2The vertical polarization unit 2 is a metal radiator with a tapered structure at its lower end. In this embodiment, it consists of two mutually perpendicular metal plates with tapered lower ends. The first metal plate 21 has a first groove 23 vertically arranged at its upper center, and the second metal plate 22 has a second groove 24 vertically arranged at its lower center. The second metal plate 22 is inserted into the first groove 23, and the first metal plate 21 is inserted into the second groove 24. These two plates are interlocked to form a mutually perpendicular metal radiator with a tapered lower end. This structure eliminates the need for metal plate welding and avoids the impact of welding on radiation stability. The lower end of the vertical polarization unit 2 is fixed at the center of the first substrate 41, and a third feed port 25 is located at the center of the first substrate 41. In use, one end of the feed line is inserted into the third feed port 25, with the inner conductor connected to the vertical polarization unit 2 and the outer conductor connected to the first radiating unit 12. In this embodiment, the two metal plates are copper plates, which can cover the full frequency bands of 2G / 3G / LTE / 5G signals and have better omnidirectional performance.

[0035] Please combine Figure 1 and Figure 4 The second horizontal polarization unit 3 is disposed on the second substrate 42, which is an FR-4 plate with a radius of 61.5 mm, a thickness of 0.8 mm, a dielectric constant of 4.4, and a loss tangent of 0.02. The second horizontal polarization unit 3 is located at... Figure 1 Above the first substrate 41, there are a second power divider 31 and a second radiating unit 32 disposed on both sides of the second substrate 42. The second radiating unit 32 is located on... Figure 1 The second power divider 31 is located on the lower surface of the second substrate 42, that is, on the side closest to the first substrate 41. Figure 1 On the upper surface of the second substrate 42, in this structural configuration, the feed line can be located on one side of the first substrate 41. Having the feed line of the first horizontal polarization unit 1 on the same side allows the feed lines to be arranged orderly within the antenna. In other embodiments, their positions can be interchanged, still achieving the basic function of radiating signals. For example... Figure 1 As shown, a support column 5 is provided between the second substrate 42 and the first substrate 41 to fix the second substrate 42. In this embodiment, the support column 5 is a plastic column. When making the antenna, there is no need to weld. Only hot melt glue is needed to fix the three together.

[0036] In this embodiment, the second radiating element 32 consists of two radiating patches arranged in a "Tai Chi" shape. Each patch has a portion of its structure extending to the other, and both are arc-shaped, resulting in superior omnidirectional performance when radiating signals. The input of the second power divider 31 is located at the center of the second radiating element 32, while its output consists of four second feed branches 33 facing the second radiating element 32. A second feed port 34, penetrating the body and connected to the input of the second power divider 31, is also located at the center of the second substrate 42. In use, one end of the feed line is inserted into this second feed port 34, with the inner conductor connected to the input of the second power divider 31 and the outer conductor connected to the second radiating element 32. This second horizontal polarization unit 3 can achieve signal coverage of the 5G band while exhibiting superior omnidirectional performance. The first horizontal polarization unit 1 and the second horizontal polarization unit 3 in this dual-polarization omnidirectional indoor antenna can be connected via a combiner and operate in their respective frequency bands.

[0037] This dual-polarized omnidirectional indoor antenna uses a metal radiator with a conical structure at the lower end to form a vertical polarization unit 2 to cover the full frequency bands of 2G / 3G / LTE / 5G signals, enabling the radiation of vertically polarized omnidirectional signals. It then uses two horizontal polarization units to cover the 2G / 3G / LTE and 5G frequency bands respectively, and their respective structures enable the horizontal polarization signals with good omnidirectional performance.

[0038] In this embodiment, strip-shaped patches 15 are also provided between adjacent dipole patches, such as... Figure 3 As shown, four strip patches 15 are also provided between the four dipole patches, which can expand the metal ground, improve the impedance matching of the vertical polarization unit 2, and improve the signal radiation effect of the antenna.

[0039] In addition, eight first directing units 16 are symmetrically arranged at the outer periphery of the first radiating unit 12. Each first directing unit 16 consists of three arc-shaped radiating patches arranged in a fan shape. In other embodiments, the number of these arc-shaped radiating patches can be appropriately increased or decreased according to actual needs, but should not be less than two. The eight first directing units 16 are spaced 45° apart from each other, which can further improve the antenna gain and reduce the antenna non-circularity, giving the antenna better omnidirectional radiation performance. The structure of the first directing unit 16 is equivalent to the director of a Yagi antenna, which can form a microstrip Yagi antenna. The first radiating unit 12 is equivalent to the driving unit. The first horizontal polarization unit 1 utilizes this Yagi antenna structure to improve the horizontal polarization gain and improve the non-circularity. Each first directing unit 16 is arranged facing the strip patch 15 and the dipole patch, which can maximize the directing effect, expand the antenna bandwidth, improve the gain, and improve the antenna's non-circularity characteristics.

[0040] In addition, the first feed branch 13 has a bent structure, which can increase its coupling area with the dipole patch, maximize the coverage of each dipole patch, and improve the signal coupling effect.

[0041] In this embodiment, four or more third slots 35 are symmetrically arranged at the edge of the second radiating unit 32, such as... Figure 4 As shown, the second radiating unit 32 is circular, and eight third slots 35 are symmetrically arranged at its edges for impedance matching, so that the second horizontal polarization unit 3 can achieve the best radiation performance.

[0042] In addition, eight second directing units 36 are symmetrically arranged at the outer periphery of the second radiating unit 32. Each second directing unit 36 ​​consists of three arc-shaped radiating patches arranged in a fan shape. In other embodiments, the number of these arc-shaped radiating patches can be appropriately increased or decreased according to actual needs, but should not be less than two. The eight second directing units 36 are spaced 45° apart from each other, which can further improve the antenna gain and reduce the antenna non-circularity, giving the antenna better omnidirectional radiation performance. The structure of the second directing unit 36 ​​is equivalent to the director of a Yagi antenna, which can form a microstrip Yagi antenna. The second radiating unit 32 is equivalent to the driving unit. The second horizontal polarization unit 3 utilizes this Yagi antenna structure to improve the horizontal polarization gain and improve the non-circularity. Each second directing unit 36 ​​is arranged facing each of the third slots 35, which can maximize the directing effect, expand the antenna bandwidth, improve the gain, and improve the antenna's non-circularity characteristics.

[0043] Furthermore, in this embodiment, the ends of the second feed branch 33 are arc-shaped and are respectively arranged facing the two third slots 35. This structure allows the second feed branch 33 to couple onto the third slots 35 of the second radiation unit 32, thereby forming a good radiation effect.

[0044] In addition, in this embodiment, the eight second guiding units 36 are also provided with holes to form the shape of "Bagua" (Eight Trigrams), which simulates the eight different trigrams corresponding to the Bagua diagram, giving the antenna a better sense of artistry. While radiating signals, it can also be used as an indoor decoration.

[0045] Figure 5 This is a schematic diagram of the performance of the horizontal polarization element of the dual-polarized omnidirectional indoor antenna. As can be seen from the figure, the impedance bandwidth of the horizontal polarization S11 is 78.6% (1.66-3.81GHz) and 6.6% (4.77-5.04GHz). The gain of the horizontal polarization varies from 1.06-3.35dBi in the 1.7-3.8GHz band and from 3.65-4.95dBi in the 4.8-5.0GHz band, which provides high gain in the required frequency bands.

[0046] Figure 6This diagram illustrates the non-circularity of the horizontal polarization element in this dual-polarized omnidirectional indoor antenna. As can be seen from the diagram, the non-circularity of the horizontal polarization element is less than 3.5 dB at the three frequencies of 2.2 GHz, 3.5 GHz, and 4.9 GHz, meeting the design requirements for an omnidirectional antenna.

[0047] Figure 7 This is a gain comparison diagram of the second horizontally polarized element of the dual-polarized omnidirectional indoor antenna with and without the second directing element. As can be seen from the figure, by adding eight second directing elements around the second radiating element, the antenna gain is increased by 0.7-1.5 dBi in the 4.8-5.0 GHz band, which is a significant gain improvement effect.

[0048] Figure 8 This is a schematic diagram of the performance of the vertical polarization element of the dual-polarized omnidirectional indoor antenna. As can be seen from the figure, the impedance bandwidth of the vertical polarization element S22 is 114.3% (1.5-5.5GHz), and the vertical polarization gain varies from 1.97 to 6.09 dBi within the effective frequency band, providing high gain within the required frequency band.

[0049] Figure 9 This is a schematic diagram showing the non-circularity of the vertical polarization element of this dual-polarized omnidirectional indoor antenna. As can be seen from the diagram, the non-circularity of the vertical polarization element is less than 3dB at the three frequencies of 2.2GHz, 3.5GHz, and 4.9GHz, meeting the industrial design requirements for omnidirectional antennas.

[0050] Figure 10 The radiation patterns of the dual-polarized omnidirectional indoor antenna are shown in the H-plane and E-plane at frequencies of 2.2 GHz, 3.5 GHz, and 4.9 GHz. The radiation patterns show that the H-plane exhibits good omnidirectional characteristics in both polarization directions, with cross-polarization less than -15 dB.

[0051] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A dual-polarized omnidirectional indoor distribution antenna, characterized in that, include: The first horizontal polarization unit includes a first power divider and a first radiation unit respectively disposed on the upper and lower surfaces of the first substrate. The first radiation unit is a dipole patch symmetrically arranged at four corners. The first power divider includes four first feed branches facing the dipole patch. The first substrate is also provided with a first feed port that penetrates the body and is connected to the input terminal of the first power divider. The vertical polarization unit is a metal radiator with a tapered structure at its lower end, and the lower end is disposed on the first substrate. The first substrate is provided with a third feed port that penetrates the body and is connected to the metal radiator. The vertical polarization unit includes a first metal plate and a second metal plate that are perpendicular to each other and have tapered lower ends. The upper middle part of the first metal plate is provided with a first groove, and the lower middle part of the second metal plate is provided with a second groove. The second metal plate is inserted into the first groove, and the first metal plate is inserted into the second groove. The second horizontal polarization unit is located above the first substrate and includes a second power divider and a second radiating unit respectively located on both sides of the second substrate. The second radiating unit consists of two radiating patches in the shape of a "Tai Chi symbol". The second power divider includes four second feed branches symmetrically arranged at the corners and facing the radiating patches. The second substrate also has a second feed port that penetrates the main body and is connected to the input terminal of the second power divider. A support column is also provided between the second substrate and the first substrate. Eight third slots are symmetrically arranged at the edges of the second radiating unit. The ends of the second feed branches are arc-shaped and are respectively arranged facing two of the third slots.

2. The dual-polarized omnidirectional indoor distribution antenna as described in claim 1, characterized in that, A strip-shaped patch is also provided between adjacent dipole patches.

3. The dual-polarized omnidirectional indoor distribution antenna as described in claim 2, characterized in that, The outer periphery of the first radiating element is symmetrically provided with eight first guiding elements; The first guiding unit consists of two or more arc-shaped radiating patches arranged in a fan shape.

4. The dual-polarized omnidirectional indoor distribution antenna as described in claim 3, characterized in that, The first guiding unit is respectively positioned facing the strip patch and the dipole patch.

5. The dual-polarized omnidirectional indoor distribution antenna as described in claim 1, characterized in that, The first power supply branch has a bent structure.

6. The dual-polarized omnidirectional indoor distribution antenna as described in claim 1, characterized in that, The second radiating element is symmetrically provided with eight second guiding elements at its outer periphery; The second guiding unit consists of two or more arc-shaped radiating patches arranged in a fan shape.

7. The dual-polarized omnidirectional indoor distribution antenna as described in claim 6, characterized in that, The third slot is respectively arranged facing the second guiding unit.

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