Dual-polarization omnidirectional array type wireless connection system

Abstract

The invention provides a dual-polarization omnidirectional array type wireless connection system, which comprises an antenna array radiator and a power divider, and is characterized in that the antenna array radiator is cylindrical, the antenna array radiator comprises a plurality of array antenna units, and the plurality of array antenna units are arranged at intervals around the cylindrical antenna array radiator; the power divider is arranged on the inner ring of the cylindrical antenna array radiator, and the power divider is connected with the plurality of array antenna units. Annular combination is carried out by adopting a directional antenna array mode, so that the high-gain omnidirectional characteristic of the antenna is realized, the dual-polarization characteristic of the same antenna is also realized, and the performance is good.

Description

Technical Field

[0001] The invention relates to the field of antenna communication, and in particular to a dual-polarization omnidirectional array type wireless connection system. Background Art

[0002] With the development of the times, wireless communication has become an indispensable way of communication in people's daily life. Interconnection can be achieved through wireless WIFI.

[0003] At present, conventional wifi antennas generally adopt built-in PCB board design or external whip-shaped rod sleeve design. The built-in PCB antenna has low gain, is greatly affected by the environment, and has low antenna efficiency. Therefore, it is rarely used in general equipment and is only used in some conditions with high requirements for appearance and small size. The whip-shaped rod sleeve antenna can achieve high-gain omnidirectional characteristics through height adjustment. It is a common design for wifi routers at present, but its polarization can only be single vertical polarization, and its appearance is not beautiful.

[0004] Therefore, it is necessary to provide a new technical solution. Summary of the invention

[0005] In order to solve the technical problems existing in the prior art, the present invention discloses a dual-polarization omnidirectional array type wireless connection system, and the specific technical solution is as follows:

[0006] The present invention provides a dual-polarization omnidirectional array type wireless connection system, which comprises an antenna array radiator and a power divider.

[0007] The antenna array radiator is cylindrical, and includes a plurality of array antenna units, and the plurality of array antenna units are arranged at intervals around the cylindrical antenna array radiator;

[0008] The power divider is arranged on the inner circle of the cylindrical antenna array radiator, and the power divider is connected to a plurality of array antenna units.

[0009] Furthermore, the antenna array radiator is a cylindrical shape formed by bending a square PCB board, and there are three array antenna units, which are arranged around the cylindrical antenna array radiator at intervals of 120°.

[0010] The power divider is a three-division power divider, and the three array antenna units are respectively connected to the three-division power divider.

[0011] Furthermore, it also includes a reflector, which is a cylindrical metal cylinder surrounded by metal plates.

[0012] The antenna array radiator is connected to the outer circle of the reflector, and the three-equal power divider is connected to the inner circle of the reflector, or

[0013] The antenna array radiator is connected to the inner circle of the reflector, and the three-equal power divider is connected to the inner circle of the antenna array radiator.

[0014] The plane of the three-dividing power divider is perpendicular to the axial direction of the cylindrical metal tube.

[0015] Furthermore, the size of the metal plate is greater than 1.0λ, the outer diameter of the cylindrical metal cylinder is 51 mm, and the wall thickness of the cylindrical metal cylinder is 1 mm.

[0016] The square PCB board is a square PCB board, the thickness of the PCB board is 0.2 mm, and the length of the PCB board is 0.45λ, wherein λ is the free space wavelength of the antenna working point.

[0017] Furthermore, the antenna array radiator and the reflector are connected via fasteners, or the antenna array radiator and the reflector are integrally arranged.

[0018] Furthermore, each array antenna unit includes two antenna group sub-units,

[0019] Along the axial direction of the cylindrical metal tube, two antenna group subunits are arranged in parallel up and down, the two antenna group subunits are connected through a horizontal polarization feeding network, and the two antenna group subunits are connected through a vertical polarization feeding network.

[0020] Furthermore, impedance adjustment blocks are connected to both the horizontal polarization feeding network connection and the vertical polarization feeding network.

[0021] Furthermore, two adjacent edges of the antenna array radiator are provided with microstrip lines, wherein the horizontal edge microstrip line is used for horizontal polarization, and the horizontal polarization feeding network is connected to the horizontal edge microstrip line, wherein the vertical edge microstrip line is used for vertical polarization, and the vertical polarization feeding network is connected to the vertical edge microstrip line.

[0022] Furthermore, the three-equal power divider is two stacked circular double-sided boards, one of which is connected to the vertical polarization feeding networks of the three array antenna units, and the other is connected to the horizontal polarization feeding networks of the three array antenna units.

[0023] Furthermore, each circular double-sided board has a feeding port and three output ports, wherein the feeding port is arranged at the center of the circular double-sided board, and the three output ports are distributed at the circumferential edge of the circular double-sided board.

[0024] The three output ends of one circular double-sided board are connected to the vertical polarization feeding networks of the three array antenna units in a one-to-one correspondence, and the three output ends of the other circular double-sided board are connected to the horizontal polarization feeding networks of the three array antenna units in a one-to-one correspondence.

[0025] On each circular double-sided board, the feeding port is connected to the output port through a power divider microstrip line.

[0026] The present invention has the following beneficial effects:

[0027] The dual-polarization omnidirectional array type wireless connection system of the present invention adopts a directional antenna array to perform a ring combination, thereby realizing the high-gain omnidirectional characteristics of the antenna, and also realizing the dual-polarization characteristics of the same antenna, with good performance, and can be combined with the PCBA board of the device to form a whole.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a structural schematic diagram of the dual-polarization omnidirectional array type wireless connection system of the present invention;

[0031] Figure 2 for Figure 1 Schematic diagram of the results of the antenna array radiator;

[0032] Figure 3 for Figure 1 Schematic diagram of the structure of the middle reflector;

[0033] Figure 4 for Figure 1 The schematic diagram of the structure of the middle three-level power divider;

[0034] Figure 5 It is a schematic diagram of the connection between the three-division power divider and the array antenna unit of the present invention;

[0035] Figure 6 It is a standing wave diagram of the dual-polarization omnidirectional array type wireless connection system of the present invention;

[0036] Figure 7 It is a three-dimensional directional diagram of the center frequency point of the dual-polarization omnidirectional array type wireless connection system of the present invention;

[0037] Figure 8 It is the horizontal plane radiation pattern of the center frequency point of the dual-polarization omnidirectional array type wireless connection system of the present invention.

[0038] Among them, 1-antenna array radiator, 11-PCB substrate, 111-opening, 12-array antenna unit, 121-antenna group subunit, 13-horizontally polarized feeding network, 14-vertically polarized feeding network, 15-impedance adjustment block, 2-reflector, 21-soldering pin perforation, 3-three-equal power divider, 31-feeding port, 32-output port, 33-power divider microstrip line. DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0040] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are 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 limiting the present invention. In the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, fixed connection, detachable connection, or integrated; mechanical connection, or electrical connection; direct connection, or indirect connection through an intermediate medium, or internal connection between two elements or interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The present invention mainly adopts directional antennas for combination to realize the high-gain omnidirectional characteristics of the antenna, and further combines feeding at different positions to realize the horizontal / vertical polarization dual-polarization function of the antenna.

[0043] See also Figures 1 to 7 , Figure 1 It is a structural schematic diagram of the dual-polarization omnidirectional array type wireless connection system of the present invention; Figure 2 for Figure 1 Schematic diagram of the results of the antenna array radiator; Figure 3 for Figure 1 Schematic diagram of the structure of the middle reflector; Figure 4 for Figure 1 The schematic diagram of the structure of the middle three-level power divider; Figure 5It is a schematic diagram of the connection between the three-division power divider and the array antenna unit of the present invention; Figure 6 It is a standing wave diagram of the dual-polarization omnidirectional array type wireless connection system of the present invention; Figure 7 It is a three-dimensional directional diagram of the center frequency point of the dual-polarization omnidirectional array type wireless connection system of the present invention; Figure 8 It is the horizontal plane radiation pattern of the center frequency point of the dual-polarization omnidirectional array type wireless connection system of the present invention.

[0044] The dual-polarization omnidirectional array type wireless connection system of the present invention is designed based on WIFI 2.4G, and has an operating frequency band of 2400-2500 MHz.

[0045] like Figure 1 As shown, the wireless connection system of the present invention mainly includes an antenna array radiator 1, a reflector 2 and a three-division power divider 3.

[0046] See also Figure 2 . The antenna array radiator 1 is cylindrical. The antenna array radiator 1 adopts a square PCB board 11 with an Fr-4 substrate, and the two opposite sides of the PCB board 11 are bent close to each other, so that the PCB board is bent into a cylindrical shape. The antenna array radiator 1 includes three array antenna units 12; the three array antenna units 12 are arranged around the cylindrical antenna array radiator 1 at intervals of 120 degrees. In this embodiment, the PCB board is square, the thickness of the PCB board is 0.2 mm, and the length of the PCB board is 0.45λ, where λ is the free space wavelength of the antenna working point. In other embodiments, the thickness and size of the PCB board can be determined according to actual conditions.

[0047] like Figures 1 to 3 As shown, the reflector 2 is a cylindrical metal tube surrounded by a metal plate, the size of the metal plate is greater than 1.0λ, the outer diameter of the cylindrical metal tube is 51mm, and the wall thickness is 1mm. The reflector 2 of the present invention is formed with aluminum as the base material, and the reflector 2 is connected to the antenna array radiator 1 through a feeder. At the corresponding position of the feeding point position of the antenna group subunit 121 of the antenna array radiator 1, a total of 6 welding pin holes 21 are opened to weld the antenna array radiator 1 and the three-equal power divider 3. In other embodiments, the size of the metal plate, the outer diameter and the wall thickness of the cylindrical metal tube can be determined according to actual conditions.

[0048] See also Figures 1 to 3In this embodiment, a square PCB board is bent around the reflector 2 and surrounds the outer circle of the reflector 2, and the three-equal power divider 3 is connected to the inner circle of the reflector 2, and the three-equal power divider 3 is respectively connected to three array antenna units 12. The plane of the three-equal power divider 3 is perpendicular to the axial direction of the cylindrical metal tube. The present invention is based on a microstrip directional antenna, uses a square PCB board as the radiator of the antenna, and a metal plate as the reflector of the antenna, thereby forming a basic antenna unit of the antenna system.

[0049] Please continue reading Figure 2 Each array antenna unit 12 includes two antenna group subunits 121, and the two antenna group subunits 121 are arranged in parallel up and down along the axial direction of the cylindrical metal tube. The two antenna group subunits 121 are connected through a horizontal polarization feeding network 13, and the two antenna group subunits 121 are connected through a vertical polarization feeding network 14. The horizontal polarization feeding network 13 has a horizontal polarization port, and the vertical polarization feeding network 14 has a vertical polarization port. Both the horizontal polarization port and the vertical polarization port are feeding ports of the array antenna unit. The present invention adopts three array antenna units 12 arranged in a ring at intervals of 120 degrees, distributed on the outside of the cylindrical metal tube. The cylindrical metal tube serves as a reflecting surface and a fixed support body of the antenna array radiator. The three array antenna units 12 are designed together on a PCB board with Fr-4 as the base material. In order to realize that it can be bent on the cylindrical metal tube, a 0.2mm thick plate design is adopted.

[0050] The present invention further improves the directional antenna gain by forming an array through two antenna group subunits. The interval between the two antenna group subunits of each array antenna unit is about 0.89λ to achieve antenna pattern superposition. The two antenna group subunits are connected by a feeding network, and the microstrip line at the edge of the square radiator adopts a 100Ω microstrip line design, so 50Ω feeding can be achieved at the center point of the microstrip line. A microstrip line is designed at each of the two adjacent edges of the square radiator, wherein the horizontal polarization feeding network 13 is connected to the horizontal edge microstrip line, and the vertical polarization feeding network 14 is connected to the vertical edge microstrip line. The horizontal edge microstrip line is used for horizontal polarization, and the vertical edge microstrip line is used for vertical polarization. Horizontal polarization is fed at the center of the microstrip line. In the vertical polarization direction, in order to achieve current superposition and ensure pattern superposition, the total length of the microstrip lines on both sides of the vertical polarization feeding point differs by about 0.5λg (working wavelength). Thereby, the horizontal / vertical polarization of the antenna is achieved, and 50Ω feeding can be performed at the same time, thereby forming an antenna group subunit.

[0051] Furthermore, the horizontal polarization feed network 13 and the vertical polarization feed network 14 are both connected with an impedance adjustment block 15, and the performance of the antenna group subunit is optimized and adjusted by the position and size. The three antenna array units of the present invention are arranged in a ring with a spacing of 120 degrees to form the entire antenna array radiator. The radiator adopts a 0.2mm thick FR-4 design, with single-sided copper coating, to form the array antenna unit and the feed network. At the same time, it can be bent well to be fixed on the cylindrical metal tube. Figure 1 As shown, in this embodiment, by setting a fixing hole (not shown) on the reflector, by opening a hole 111 at a position corresponding to the fixing hole on the antenna array radiator 1, the antenna array radiator 1 and the reflector 2 can be firmly fixed together by using a fastener through the opening 111 and the fixing hole, and the gap between the two is about 0.03λ. The fastener is a plastic screw. In another embodiment, the antenna array radiator is integrally arranged with the reflector.

[0052] See also Figure 4 and Figure 5 The three-equal power divider 3 is two circular double-sided boards arranged in a stacked manner, each of which has a feed port 30 and three output ports. The feed port 30 is arranged at the center of the circular double-sided board, and the three output ports are distributed at the circumferential edge of the circular double-sided board. On each circular double-sided board, the feed port 30 is connected to the three output ports through a power divider microstrip line 33. Specifically, for the convenience of description, one of the circular double-sided boards is marked as an upper circular double-sided board 31, and the other circular double-sided board is marked as a lower circular double-sided board 32. The three output ports 311 of the upper circular double-sided board 31 are connected to the vertical polarization feeding networks 14 of the three array antenna units in a one-to-one correspondence, and the three output ports 321 of the lower circular double-sided board 32 are connected to the horizontal polarization feeding networks 13 of the three array antenna units in a one-to-one correspondence.

[0053] One side of each circular double-sided board of the present invention is covered with copper as a metal ground, and the other side is a microstrip line. Two circular double-sided boards, one connected to a vertical polarization port, and the other connected to a horizontal polarization port. The center of the three-equal power divider board is the feed port of the antenna, which can be connected to a coaxial connector or a coaxial line. The three output ports of each circular double-sided board correspond to the ports on the antenna array radiator of the same polarization, and are fixed by welding, thereby realizing the design of a dual-polarization omnidirectional array wireless connection system.

[0054] Please continue reading Figure 1 In this embodiment, the antenna array radiator 1 is located in the outer ring of the cylindrical metal tube. In other embodiments, the antenna array radiator 1 is located in the inner ring of the cylindrical metal tube, and the three-equal power divider is connected to the inner ring of the antenna array radiator.

[0055] See also Figure 6 , Figure 6 is the voltage standing wave ratio diagram of the dual polarization port of the antenna system, from Figure 6 It can be seen that the antenna standing wave is less than 2.0 in the working frequency band 2.4G (2400-2500MHz).

[0056] See also Figure 7 , Figure 7 is the 3D radiation pattern of the antenna; Figure 8 is the 2D radiation pattern of the antenna in the horizontal plane, so Figure 7 and 8 It can be seen that the horizontal plane non-circularity of the antenna is less than 5dB. This design can achieve an overall horizontal plane non-circularity of the antenna of less than + / -2.5dB. The dual-polarization port isolation is greater than 25dB, and the antenna gain is greater than 6dBi. The dual-polarization characteristics are achieved, and omnidirectional coverage can be met at the same time.

[0057] The antenna system of the present invention is based on microstrip directionality, the antenna array radiator is a square PCB board, and the size of the antenna array radiator is 0.45λ of the wavelength of the center frequency (2450MHz), forming the basic unit of the antenna.

[0058] The present invention adopts a binary array method for array formation, the interval between two antenna group sub-units is about 0.89λ, the two antenna group sub-units are connected by a 100Ω microstrip line, the horizontal polarization is fed at the center of the microstrip line, and the length of the microstrip line at both ends of the vertical polarization feeding point differs by about 0.5λg (2450MHz working wavelength).

[0059] The dual-polarization omnidirectional array type wireless connection system of the present invention is designed with a PCB microstrip directional antenna as the basic unit, and the dual-polarization and high-gain characteristics of the antenna unit of the system are designed. Through a two-element array, an antenna array unit is formed to further improve the gain of the antenna. In order to implement the omnidirectional characteristics of the antenna wireless connection system in the horizontal direction, three antenna array units are rotated and arranged, and are distributed on the outside of a cylindrical metal cylinder at an angle of 120 degrees apart from each other. The cylindrical metal cylinder can be used as a reflection surface of the qualitative antenna and a fixed support for the antenna. In order to better achieve conformality with the cylindrical metal cylinder, the antenna array radiator is designed with a 0.2 thick FR-4 substrate, so that it can be bent well, so that it can be fixedly attached to the surface of the cylindrical metal cylinder with equal gaps. By drilling holes in the cylindrical metal cylinder and fixing it with a plastic screw column, the FR-4 board of the radiator is fixed to the cylindrical metal cylinder. The cylindrical metal tube adopts a hollow inner design and has two three-division power dividers built in, which are respectively connected to the vertical / horizontal ports of the three array antenna units, thereby realizing dual-polarization omnidirectional characteristics.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. 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 representations of the above terms do 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. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0061] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify and vary the above embodiments within the scope of the present invention.

Claims

1. A dual-polarization omnidirectional array wireless connection system, characterized in that: It includes an antenna array radiator and a power divider. The antenna array radiator is cylindrical, and includes a plurality of array antenna units, and the plurality of array antenna units are arranged at intervals around the cylindrical antenna array radiator; The power divider is arranged on the inner circle of the cylindrical antenna array radiator, and the power divider is connected to a plurality of array antenna units.

2. The dual-polarization omnidirectional array wireless connection system according to claim 1, characterized in that: The antenna array radiator is a cylindrical shape formed by bending a square PCB board. There are three array antenna units, which are arranged around the cylindrical antenna array radiator at intervals of 120°. The power divider is a three-division power divider, and the three array antenna units are respectively connected to the three-division power divider.

3. The dual-polarization omnidirectional array wireless connection system according to claim 2, characterized in that: It also includes a reflector, which is a cylindrical metal cylinder surrounded by metal plates. The antenna array radiator is connected to the outer circle of the reflector, and the three-equal power divider is connected to the inner circle of the reflector, or The antenna array radiator is connected to the inner circle of the reflector, and the three-equal power divider is connected to the inner circle of the antenna array radiator. The plane of the three-dividing power divider is perpendicular to the axial direction of the cylindrical metal tube.

4. The dual-polarization omnidirectional array wireless connection system according to claim 3, characterized in that: The size of the metal plate is greater than 1.0λ, the outer diameter of the cylindrical metal cylinder is 51mm, and the wall thickness of the cylindrical metal cylinder is 1mm. The square PCB board is a square PCB board, the thickness of the PCB board is 0.2 mm, and the length of the PCB board is 0.45λ, wherein λ is the free space wavelength of the antenna working point.

5. The dual-polarization omnidirectional array wireless connection system according to claim 3, characterized in that: The antenna array radiator and the reflector are connected via fasteners, or the antenna array radiator and the reflector are integrally arranged.

6. The dual-polarization omnidirectional array wireless connection system according to claim 3, characterized in that: Each array antenna unit consists of two antenna group sub-units. Along the axial direction of the cylindrical metal tube, two antenna group subunits are arranged in parallel up and down, the two antenna group subunits are connected through a horizontal polarization feeding network, and the two antenna group subunits are connected through a vertical polarization feeding network.

7. The dual-polarization omnidirectional array wireless connection system according to claim 6, characterized in that: Impedance adjustment blocks are connected to both the horizontal polarization feeding network connection and the vertical polarization feeding network.

8. The dual-polarization omnidirectional array wireless connection system according to claim 6, characterized in that: Microstrip lines are arranged on two adjacent edges of the antenna array radiator, wherein the horizontal edge microstrip line is used for horizontal polarization, and the horizontal polarization feeding network is connected to the horizontal edge microstrip line, wherein the vertical edge microstrip line is used for vertical polarization, and the vertical polarization feeding network is connected to the vertical edge microstrip line.

9. The dual-polarization omnidirectional array wireless connection system according to claim 2, characterized in that: The three-equal power divider is two stacked circular double-sided boards, one of which is connected to the vertical polarization feeding networks of the three array antenna units, and the other is connected to the horizontal polarization feeding networks of the three array antenna units.

10. The dual-polarization omnidirectional array wireless connection system according to claim 9, characterized in that: Each circular double-sided board has a feeding port and three output ports, wherein the feeding port is arranged at the center of the circular double-sided board, and the three output ports are distributed at the circumferential edge of the circular double-sided board. The three output ends of one circular double-sided board are connected to the vertical polarization feeding networks of the three array antenna units in a one-to-one correspondence, and the three output ends of the other circular double-sided board are connected to the horizontal polarization feeding networks of the three array antenna units in a one-to-one correspondence. On each circular double-sided board, the feeding port is connected to the output port through a power divider microstrip line.

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