Multi-feed antenna and communication device

Abstract

The invention provides a multi-feed antenna and communication equipment. The multi-feed antenna comprises a radiator, a reflecting plate, a plurality of feed probes and a plurality of metal walls, the projection of the radiator on the plane where the reflecting plate is located in the direction perpendicular to the reflecting plate is located in the area where the reflecting plate is located. At least part of the feed probe is located between the radiator and the reflecting plate, and the feed probe is used for independently feeding the radiator in a coupling manner; the metal walls are arranged between the radiating body and the reflecting plate, one end, close to the radiating body, of each metal wall is connected with the radiating body, and the plurality of metal walls are respectively arranged between two adjacent feed probes. According to the multi-feed antenna and the communication equipment provided by the embodiment of the invention, the isolation degree among a plurality of ports of the multi-feed antenna can be improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular, to a multi-feed antenna and communication equipment. Background Art

[0002] Multiple-input multiple-output (MIMO) communication technology is one of the key technologies of modern mobile communication systems. Its core lies in utilizing the spatial freedom provided by multiple transmitting antennas and multiple receiving antennas to effectively improve the spectrum utilization of wireless communication systems, which can greatly increase channel capacity and improve communication quality.

[0003] However, since multiple antennas are provided, it is difficult to ensure the isolation between multiple antenna ports, which makes it easy for multiple antennas to interfere with each other, affecting antenna performance. Summary of the invention

[0004] The present application provides a multi-feed antenna and a communication device, which can enable the multi-feed antenna to have higher port isolation.

[0005] In a first aspect, a multi-feed antenna is provided, comprising: a radiator; a reflector, wherein a projection of the radiator on a plane where the reflector is located in a direction perpendicular to the reflector is located within an area where the reflector is located; a plurality of feeding probes, wherein at least a portion of the feeding probes is located between the radiator and the reflector, and the plurality of feeding probes are used to couple and feed the radiator separately; and a plurality of metal walls, wherein the metal walls are arranged between the radiator and the reflector, an end of the metal wall close to the radiator is connected to the radiator, and the plurality of metal walls are respectively arranged between two adjacent feeding probes.

[0006] In the embodiment provided in the present application, the multi-feed antenna includes a plurality of metal walls, and the plurality of metal walls are arranged between the radiator and the reflector, and are respectively arranged between two adjacent feeding ports, so that the metal walls can serve as a decoupling structure to improve the isolation between any two feeding ports; and the plurality of metal walls can divide the multi-feed antenna into a plurality of regions, and divide the multi-feed antenna into a plurality of antenna sub-units, and the plurality of sub-units are placed with zero spacing between each other, thereby enabling the miniaturization of the multi-feed antenna.

[0007] In combination with the first aspect, in some implementations of the first aspect, the overall structure formed by the radiator and the feeding probe is axially symmetric about a first axis and a second axis, respectively, the first axis and the second axis are parallel to the radiator, and the first axis is perpendicular to the second axis.

[0008] In the embodiments provided in the present application, the overall structure formed by the radiator and the feeding probe is axially symmetric about the first axis and the second axis, respectively, which can further improve the isolation between the ports of the multi-feed antenna, and enable the antenna to operate in a similar working mode and have a similar radiation pattern when each feeding port is excited.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the distance between the metal wall and the reflective plate is greater than 0 and less than 0.1 times the wavelength corresponding to the center operating frequency of the multi-feed antenna.

[0010] In the embodiment provided in the present application, the distance between the metal wall and the reflector is greater than 0 and less than 0.1 times the wavelength corresponding to the central operating frequency of the multi-feed antenna, and a new energy coupling channel can be formed between the metal wall and the reflector, so that when the feeding probe is excited, the energy coupled from the metal wall and the reflector to other feeding ports can offset the energy coupled from the space to other feeding ports, thereby improving the isolation between multiple feeding ports.

[0011] In combination with the first aspect, in some implementations of the first aspect, the feeding probe includes a first part and a second part, the first part is parallel to the radiator, the second part is perpendicular to the radiator, and the second part is arranged on a side of the first part close to the reflector.

[0012] In combination with the first aspect, in some implementations of the first aspect, the first portion is in a straight line shape or a broken line shape.

[0013] In the embodiment provided in the present application, the feeding probe includes two parts parallel to the radiator and two parts perpendicular to the radiator, so that the energy generated by the feeding probe when excited can be better coupled to the radiator.

[0014] In combination with the first aspect, in certain implementations of the first aspect, the radiator includes an opening, at least part of the second part passes through the opening, and the first part is located on a side of the radiator away from the reflective plate, or the side of the radiator close to the reflective plate includes a groove, and at least part of the first part is arranged in the groove.

[0015] In the embodiments provided in the present application, the radiator includes openings or grooves, which enables the multi-feed antenna to adapt to different antenna environments, feed the radiator in different structural forms, and improve the feeding effect of the feeding probe.

[0016] In combination with the first aspect, in certain implementations of the first aspect, a projection of the feeding probe on the plane where the radiator is located along a direction perpendicular to the radiator is a first projection, the first projection is located outside the region where the radiator is located, and the shortest distance between the first projection and the radiator is less than 0.1 working wavelength; or, at least part of the first projection is located in the region where the radiator is located.

[0017] In the embodiments provided in the present application, the shortest distance between the first projection of the feeding probe and the radiator is less than 0.1 working wavelength, or at least part of the first projection is located in the area where the radiator is located, so that the feeding probe can better feed the radiator.

[0018] In combination with the first aspect, in some implementations of the first aspect, the radiator is square, rectangular or polygonal.

[0019] In combination with the first aspect, in some implementations of the first aspect, the radiator includes a planar portion and a bent portion, the bent portion is arranged at an edge of the planar portion, and a plane where the bent portion is located forms a certain angle with the planar portion.

[0020] In the embodiments provided in the present application, by adjusting the shape and structure of the radiator, the current path of the multi-feed antenna can be adjusted, which helps to achieve miniaturization of the multi-feed antenna.

[0021] In combination with the first aspect, in some implementations of the first aspect, a projection of the metal wall along a direction perpendicular to the radiator on the plane where the radiator is located is located in the region where the radiator is located.

[0022] In the embodiment provided in the present application, the projection of the metal wall on the radiator along the direction perpendicular to the radiator is located in the area where the radiator is located, which can improve the isolation between the ports of the multi-feed antenna.

[0023] In combination with the first aspect, in some implementations of the first aspect, a projection of the metal wall on the radiator along a direction perpendicular to the radiator is in a cross shape.

[0024] In a second aspect, a communication device is provided, comprising the multi-functional antenna as in the first aspect or any possible implementation manner of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of an application scenario of an embodiment of the present application.

[0026] Figure 2 It is a schematic diagram of the three-dimensional structure of the multi-feed antenna provided in an embodiment of the present application.

[0027] Figure 3It is a schematic diagram of the top view structure of the multi-feed antenna provided in an embodiment of the present application.

[0028] Figure 4 It is a schematic diagram of the three-dimensional structure of the multi-feed antenna provided in an embodiment of the present application.

[0029] Figure 5 It is a schematic diagram of the top view structure of the multi-feed antenna provided in an embodiment of the present application.

[0030] Figure 6 It is a schematic diagram of the main structure of the multi-feed antenna provided in an embodiment of the present application.

[0031] Figure 7 It is a schematic diagram of the structure of the radiator provided in an embodiment of the present application.

[0032] Figure 8 It is a schematic diagram of the structure of the radiator provided in an embodiment of the present application.

[0033] Fig. 9 It is a schematic diagram of the S parameter results of the multi-feed antenna provided in an embodiment of the present application.

[0034] Fig.10 It is a gain curve diagram of the multi-feed antenna provided in an embodiment of the present application.

[0035] Fig.11 It is the radiation pattern of the multi-feed antenna provided in the embodiment of the present application. DETAILED DESCRIPTION

[0036] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0037] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0038] The terms "include", "comprising", "having" and variations thereof mean "including but not limited to", unless specifically emphasized otherwise.

[0039] In various embodiments of the present application, the first, second, etc. are only used to indicate that multiple objects are different. For example, the first part and the second part of the feeding probe are only used to indicate different parts of the feeding probe. They should not have any impact on the shape and number of the feeding probes, and the first, second, etc. mentioned above should not impose any limitations on the embodiments of the present application.

[0040] Figure 1 A schematic diagram of an application scenario of an antenna provided in an embodiment of the present application, wherein an antenna 111 can be arranged on a pole 115 and fixedly connected to the pole 115, and the pole 115 can be fixed on the ground. The antenna 111 can be used to receive and send antenna signals, and the antenna 111 can include a multi-feed antenna described below, a multi-feed antenna can be called an antenna unit, the antenna 111 can be composed of one or more antenna units, and multiple antenna units can also be arranged in an array according to a certain rule to form one or more antenna arrays, and the frequencies of the antenna units in each antenna array can be the same or different. The antenna 111 can be connected to a radio remote unit (RRU) 112 via a feeder 113, and the RRU 112 can be connected to a building base band (BBU) 114 via an optical fiber.

[0041] Figure 2 A schematic diagram of a three-dimensional structure of a multi-feed antenna provided in an embodiment of the present application, Figure 3 for Figure 2 The top view of the multi-feed antenna is shown in FIG. Figure 2 or Figure 3 As shown, the multi-feed antenna may include a radiator 100 , a plurality of feeding probes 200 , a plurality of metal walls 300 and a reflection plate 400 .

[0042] The radiator 100 can be parallel to the reflector 400, and the projection of the radiator 100 on the plane where the reflector 400 is located in the direction perpendicular to the reflector 400 can be located in the area where the reflector 400 is located, that is, the size of the radiator 100 can be smaller than the size of the reflector 400, and the plane where the reflector is located is the xy plane shown in the figure. When the multi-feed antenna receives a signal, the reflector 400 can reflect and focus the signal at the receiving point to achieve directional reception of the multi-feed antenna. When sending a signal, it can reflect and focus the signal at the sending point to achieve directional transmission of the multi-feed antenna, thereby greatly enhancing the signal receiving or transmitting capability of the multi-feed antenna, and can reduce or avoid interference of the signal from the side of the reflector 400 away from the radiator 100 with the signal of the radiator 100.

[0043] The shape of the reflector 400 may be the same as or different from that of the radiator 100. For example, the radiator 100 may be a square, the reflector 400 may be a rectangle, the side length of the radiator 100 may be 45.5 mm, the side lengths of the reflector 400 may be 100 mm and 120 mm respectively, the radiator 100 may be located directly above the reflector 400, and the spacing between the radiator 100 and the reflector 400 may be, for example, 25 mm. The shape of the reflector 400 may also be other shapes such as a square, a circle, an ellipse, a trapezoid, etc., which is not limited in the present application, and the size of the radiator 100 only needs to be smaller than that of the reflector 400.

[0044] A plurality of feeding probes 200 and a plurality of metal walls 300 may be arranged on the same side of the radiator 100, and the plurality of feeding probes 200 and the plurality of metal walls 300 may be located between the radiator 100 and the reflector 400. One end of the feeding probe 200 close to the reflector 400 may be used as a positive electrode, and the reflector 400 may be used as a negative electrode, and the two together constitute a feeding port to feed the radiator 100. The plurality of feeding probes 200 may be coupled and fed to the radiator 100 individually, that is, the plurality of feeding probes 200 may be excited and work individually, and the feeding probes 200 may not be in direct contact with the radiator 100, and the radiator 100 may be excited by coupling, so that the radiator 100 radiates electromagnetic wave signals to the outside.

[0045] A plurality of feeding probes 200 may have the same structure, for example, each feeding probe 200 may include a first portion 201 and a second portion 202, wherein the first portion 201 may be parallel to the radiator 100, that is, the first portion 201 may be parallel to the xy plane shown in the figure, and the second portion 202 may be perpendicular to the radiator 100, and the first portion 201 and the second portion 202 may be two portions fixedly connected, or may be an integral structure. The second portion 202 may be arranged at an end of the first portion 201 away from the radiator 100, that is, the feeding probe 200 may be in an "L" shape, and the second portion 202 may be arranged on a side of the first portion 201 close to the reflector 400 in a direction perpendicular to the first portion 201, or the second portion 202 may be located at the lower side of the first portion 201, and the feeding probe 200 may better feed the radiator 100 through the first portion 201 parallel to the radiator 100.

[0046] It should be noted that, in the embodiments of the present application, two structural members being parallel to each other may refer to the two structural members being approximately parallel to each other, rather than being absolutely parallel to each other. It can be understood by those skilled in the art that since those skilled in the art can appropriately adjust the angle between the structural members according to the design requirements, the two structural members being parallel to each other allows a deviation within a certain angle range, for example, the angle between the two structural members is less than 10°, etc. Similarly, two structural members being perpendicular to each other may refer to the two structural members being approximately perpendicular to each other.

[0047] The sum of the lengths of the first part 201 and the second part 202 can be in the range of 0.2 to 0.25 of the working wavelength λ. The lengths of the first part 201 and the second part 202 are the dimensions of the longer sides of the first part 201 and the second part 202. For example, when the second part 202 is arranged along the z-axis direction and the first part 201 is arranged along the diagonal direction of the radiator 100, the length of the second part 202 is the dimension of the second part 202 in the z-axis direction, and the length of the first part 201 is the dimension of the first part 201 in the diagonal direction of the radiator 100.

[0048] The first part 201 may be a metal strip, the second part 202 may be a metal column, the shape of the first part 201 may be, for example, a rectangle as shown in the figure, the shape of the second part 202 may be a cylinder, the shape of the first part 201 may also be a square or other shapes such as a circle, a triangle, a polygon, an irregular shape, etc., and the second part 202 may also be other shapes such as a prism. When the feeding probe 200 is located between the radiator 100 and the reflector 400, the height of the feeding probe 200 may be less than the distance between the radiator 100 and the reflector 400. For example, the height of the feeding probe 200 may be, for example, 23 mm. The present application does not limit the shape of the feeding probe 200.

[0049] The feeding probe 200 may also include only the second portion 202 shown in the figure, but not the first portion 201, and the radiator 100 is fed through the first portion 201 (not shown in the figure). When the feeding probe 200 includes only the second portion 202, the feeding probe 200 and the radiator 100 may have a smaller distance along the x-axis, y-axis and z-axis directions shown in the figure. For example, the feeding probe 200 may be directly connected to the radiator 100 to better feed the radiator 100.

[0050] The radiator 100 may be a square structure, and accordingly, the number of the feeding probes 200 may be four, which are respectively arranged at positions corresponding to the four vertices of the square radiator 100. The overall structure formed by the radiator 100 and the four feeding probes 200 may be axisymmetric about the first axis and the second axis, respectively. The first axis and the second axis may be parallel to the radiator 100, and the first axis and the second axis may be perpendicular to each other. Exemplarily, the first axis may be parallel to the x-axis, the second axis may be parallel to the y-axis, and the first part of the feeding probe 200 may extend in the direction of the diagonal of the square radiator 100, so that the overall structure formed by the radiator 100 and the feeding probe 200 can be axisymmetric about the first axis and the second axis, that is, the multi-feed antenna can have both horizontal symmetry and vertical symmetry, so that the feeding probes 200 have a high similarity, and each feeding probe 200 can work in a similar working mode when excited, and the multi-feed antenna can have a high degree of isolation.

[0051] Figure 3 The feeding probe 200 shown in (a) is partially located in the area where the radiator 100 is located, that is, along the direction perpendicular to the radiator 100, that is, along the z-axis direction, the projection on the plane where the radiator 100 is located. In other words, the radiator 100 can cover a part of the area of ​​the feeding probe 200. The feeding probe 200 can also be located outside the coverage range of the radiator 100, such as Figure 3 As shown in (b) in FIG. 1 , or completely covered by the radiator 100, as shown in FIG. Figure 3 As shown in (c) in the figure, in other words, the projection of the feeding probe 200 along the z-axis direction on the plane where the radiator 100 is located can be located outside the area where the radiator 100 is located, or can be completely located within the area where the radiator 100 is located. When the feeding probe 200 is located outside the coverage range of the radiator 100, the shortest distance d from the projection of the feeding probe 200 along the z-axis direction on the plane where the radiator 100 is located to the radiator 100 can be less than 0.1 working wavelengths, for example, it can be 0.05 working wavelengths, etc., so that the feeding probe 200 can better feed the radiator 100. The projection of the feeding probe 200 along the direction perpendicular to the radiator 100 on the plane where the radiator 100 is located can also be called a first projection. The shortest distance from the first projection to the radiator 100 can be the distance from the vertex of the radiator 100 to a corresponding side of the feeding probe 200 close to the radiator 100.

[0052] Figure 2 The feeding probe 200 shown is located below the radiator 100. The height of the feeding probe 200 may be approximately flush with the radiator 100, or may be higher than the radiator 100. Figure 4 shown.

[0053] See also Figure 4 In FIG. (a), the side of the radiator 100 close to the reflector 400 may include a groove 101, and the groove 101 may be arranged at a position close to the top corner of the radiator 100, the number of the grooves 101 may be the same as the number of the feeding probes 200, the shape of the grooves 101 may be the same as the shape of the first portion 201 of the feeding probe 200, and the size of the groove 101 may be greater than or equal to the size of the first portion 201 of the feeding probe 200, so that at least part of the first portion 201 can be accommodated in the groove 101, that is, the height of the feeding probe 200 can be flush with the height of the radiator 100. The first portion 201 of the feeding probe 200 may contact the radiator 100 through the groove 101, or may not contact the radiator 100, but be suspended in the groove 101.

[0054] See also Figure 4 As shown in FIG. (b), the radiator 100 may also include an opening 102, and the opening 102 may also be arranged at a position close to the top corner of the radiator 100. The number of the openings 102 may be the same as the number of the feeding probes 200, the shape of the openings 102 may be the same as the shape of the second portion 202 of the feeding probe 200, and the size of the openings 102 may be greater than or equal to the size of the second portion 202 of the feeding probe 200, so that the second portion 202 of the feeding probe 200 may pass through the opening 102 and extend from the side of the radiator 100 close to the reflector 400 to the side away from the reflector 400. In this example, the first portion 201 of the feeding probe 200 may be arranged on the side of the radiator 100 away from the reflector 400, and connected to the end of the second portion 202 away from the reflector 400, that is, the height of the feeding probe 200 may be higher than the height of the radiator 100. The second portion 202 of the feeding probe 200 may contact the radiator 100 through the opening 102 or may not contact the radiator 100 . Similarly, the first portion 201 may fit the radiator 100 or may not contact the radiator 100 .

[0055] When the radiator 100 includes a groove 101 or an opening 102, the projection of the feeding probe 200 on the plane where the radiator 100 is located in a direction perpendicular to the radiator 100 can be located in the area where the radiator 100 is located. In this case, the top view of the multi-feed antenna can be approximately as follows: Figure 3 The structure shown in (c) in .

[0056] When the radiator 100 does not include the above-mentioned groove 101 and opening 102, the setting height of the feeding probe 200 can also be higher than the position of the radiator 100. For example, the second part 202 of the feeding probe 200 can be set outside the area where the radiator 100 is located, and at least part of the second part 202 can be located between the radiator 100 and the reflector 400, and the first part 201 of the feeding probe 200 can be set above the radiator 100, that is, set on the side of the radiator 100 away from the reflector 400 (not shown in the figure). In this example, the projection of the feeding probe 200 on the plane where the radiator 100 is located in the direction perpendicular to the radiator 100 can be partially located in the area where the radiator 100 is located, or it can be located outside the area where the radiator 100 is located.

[0057] The radiation plate 100 of the multi-feed antenna includes a groove 101 or an opening 102, which can facilitate the selection of the structural state of the feeding probe 200 according to the working environment and working state of the multi-feed antenna, so that the energy generated by the excitation of the feeding probe can be better coupled to the radiator, thereby improving the performance of the multi-feed antenna.

[0058] Above Figures 1 to 4 The first part 201 of the feed is approximately a rectangular structure, that is, the first part 201 can be a straight line structure, and the first part 201 can also be a broken line structure. Figure 5 In the structure shown, the first portion 201 may include a straight portion 2011 and a bent portion 2012, the bent portion 2012 may be arranged at an end of the straight portion 2011 away from the second portion 202, and the bent portion 2012 may also be parallel to the plane where the radiator 100 is located. The straight portion 2011 may be rectangular, and the long side of the rectangular straight portion 2011 may be parallel to the y-axis direction shown in the figure. When the feeding probe 200 is arranged outside the coverage range of the radiator 100, the bent portion 2012 may be arranged on a side of the first portion 201 close to the radiator 100 to better feed the radiator 100.

[0059] Continue to see Figures 2 to 5In the structure shown, the multiple metal walls 300 of the multi-feed antenna can be arranged between the radiator 100 and the reflector 400, and one end of the multiple metal walls 300 close to the radiator 100 can be connected to the radiator 100. The multiple metal walls 300 can be respectively arranged between the multiple feeding probes 200, so that the multiple feeding probes 200 and the metal walls 300 are arranged alternately. For example, when the number of the feeding probes 200 is 4, the number of the metal walls 300 can also be 4, and a metal wall 300 can be arranged between any two adjacent feeding probes 200. The multiple metal walls 300 can extend outward from the center position of the radiator 100 in a direction parallel to the side of the radiator 100, and the multiple metal walls 300 can be fixedly connected at the center position of the radiator 100. The projection of the multiple metal walls 300 on the plane where the radiator 100 is located in a direction perpendicular to the radiator 100 can be in a "cross" shape.

[0060] The shapes of the multiple metal walls 300 may be the same, for example, the multiple metal walls 300 may be rectangular metal plates, and the thickness of the metal plates may be, for example, 1.5 mm. The heights of the multiple metal walls 300 may be the same, that is, the dimensions of the multiple metal walls 300 in the z-axis direction may be the same, and the lengths of the multiple metal walls 300 may be the same or different, and the lengths of each metal wall 300 are the dimensions of the metal wall 300 arranged along the x-axis direction in the x-axis direction and the dimensions of the metal wall 300 arranged along the y-axis direction in the y-axis direction. The projections of the multiple metal walls 300 in the direction perpendicular to the radiator 100 on the plane where the radiator 100 is located may be located in the area where the radiator 100 is located, that is, the sum of the lengths of the two metal walls 300 parallel to the same side of the radiator 100 may be less than or equal to the side length of the corresponding radiator 100, for example, the sum of the lengths of the two metal walls 300 may be 30 mm.

[0061] It should be noted that the projections of the multiple metal walls 300 on the plane where the radiator 100 is located in the direction perpendicular to the radiator 100 may also be partially located outside the area where the radiator 100 is located, that is, the sum of the lengths of the two metal walls 300 parallel to the same side of the radiator 100 may also be greater than the length of the corresponding side of the radiator 100. The lengths of the multiple metal walls 300 can be adjusted according to the application scenario of the multi-feed antenna to improve the isolation of the multi-feed antenna.

[0062] In the embodiment provided by the present application, the plurality of metal walls 300 can divide the radiator 100 into a plurality of regions. For example, the number of metal walls 300 shown in the figure is 4, and the radiator 100 is divided into the four regions shown in the figure, and the multi-feed antenna can be adjusted into four quarter-wavelength resonance units, and the four resonance units are arranged with zero spacing, so as to realize the miniaturization of the multi-feed antenna. In addition, the plurality of metal walls 300 can be used as a decoupling structure to improve the isolation between the plurality of feeding probes 200.

[0063] The distance between the plurality of metal walls 300 and the reflector 400 may be greater than or equal to 0 and less than 0.1 times of the wavelength corresponding to the central operating frequency of the multi-feed antenna. Figure 6 In the structure shown in the figure, the distance between the multiple metal walls 300 and the reflector 400 is the distance between the bottom end of the metal wall 300 and the reflector 400 in the z-axis direction shown in the figure. The multiple metal walls 300 can have a certain gap with the reflector 400, and the gap can be much smaller than the wavelength of the multi-feed antenna, for example, it can be smaller than 0.1 times of the wavelength corresponding to the central operating frequency of the multi-feed antenna. Figure 6 Alternatively, the plurality of metal walls 300 may also be in direct contact with the reflector 400, that is, the gap may be 0, as shown in FIG. Figure 6 The structure shown in (b).

[0064] When multiple feeding probes 200 are fed individually, the generated energy will be coupled to other feeding probes 200 from space. When gaps are formed between the multiple metal walls 300 and the reflecting plate 400, and the gap distance is less than 0.1 times the wavelength corresponding to the central operating frequency of the multi-feed antenna, a new coupling channel can be formed between the multiple metal walls 300 and the reflecting plate 400. The energy of the excited feeding probe 200 coupled to other feeding probes 200 from the gap can be offset by the energy coupled to other feeding probes 200 from space, thereby improving the isolation between each feeding probe 200.

[0065] Above Figures 2 to 6 In the multi-feed antenna described, the shape of the radiator 100 may be square or rectangular, and the plurality of feeding probes 200 may be respectively arranged at the vertices of the radiator 100. The shape of the radiator 100 may also be polygonal, such as Figure 7 The structure shown in Figure 7 It can be a top view of the multi-feed antenna.

[0066] in, Figure 7The radiator 100 shown in (a) is an octagon, which can be obtained by cutting off the four vertex parts of a square or rectangular radiator 100. The shapes and sizes of the four vertex parts can be the same, so that the obtained polygon still has horizontal symmetry and vertical symmetry, that is, the polygon can still be axially symmetrical about the axis parallel to the x-axis and the y-axis. In this example, multiple feeding probes 200 can be respectively arranged at the midpoint position of the cut edge, or, in other words, multiple feeding probes 200 can be located at the vertex position of the original radiator 100, so that the overall structure of the multiple feeding probes 200 and the radiator 100 still has horizontal symmetry and vertical symmetry.

[0067] Similarly, Figure 7 (b) can be obtained by cutting off a triangle at the center of the four sides of the square or rectangular radiator 100, and the sizes of the cut parts of the four sides can be the same, so that the radiator 100 still has horizontal symmetry and vertical symmetry. In this example, multiple feeding probes 200 can be set at the top corners of the original square radiator 100, so that the overall structure of the multiple feeding probes 200 and the radiator 100 still has horizontal symmetry and vertical symmetry.

[0068] Figure 7 (c) can be obtained by cutting off the four vertices of a square or rectangular radiator 100 and a triangle on four sides at the same time, so that the radiator 100 and the overall structure composed of the radiator 100 and multiple feeding probes 200 still have horizontal symmetry and vertical symmetry.

[0069] The radiator 100 forms a polygonal structure by cutting corners, which can change the current path of the multi-feed antenna and realize the miniaturized structure of the multi-feed antenna. The size of the multiple metal walls 300 can be adjusted according to the cutting angle position and cutting angle size of the radiating plate to ensure the isolation between the multiple feeding probes 200. The size of the cutting angle can be adjusted according to the impedance matching and multi-port isolation of the feeding probe 200.

[0070] Above Figures 2 to 7 The radiator 100 shown in the figure is a planar structure. The radiator 100 may also include both a planar portion 103 and a bent portion 104. Figure 8 The plane portion 103 may be parallel to the xy plane shown in the figure, the plane where the bending portion 104 is located may be arranged at the edge of the plane portion 103 , and the plane where the bending portion 104 is located may be arranged at a certain angle to the plane portion 103 .

[0071] The bent portion 104 can be disposed above the plane portion 103, that is, located above the plane portion 103 in the z-axis direction, forming a state of being bent upward obliquely, similar to a basin-shaped structure, such as Figure 8 The bent portion 104 can also be disposed below the plane portion 103, that is, below the plane portion 103 in the z-axis direction, forming a state of oblique downward bending, similar to an inverted basin-shaped structure, such as Figure 8 When the plane portion 103 is formed into a multi-deformable structure by cutting corners, the number of the bent portions 104 may correspond to the number of sides of the plane portion 103. For example, when the rectangular radiator 100 is cut off from four corners to form an octagonal structure, the bent portions 104 may correspond to the octagonal structure to form a bent structure that is inclined upward or downward.

[0072] When the radiator 100 includes a bent portion 104, the bending angles of the bent portions 104 corresponding to the multiple sides of the radiator 100 and the sizes of the bent portions 104 may correspond to each other, so that the radiator 100 satisfies horizontal symmetry and vertical symmetry. When the radiator 100 includes a bent portion 104, the arrangement position of the feeding probe 200 may be similar to that described in the above embodiment, and will not be repeated here.

[0073] The radiator 100 includes a planar portion 103 and a bent portion 104 , which can increase the current path of the radiator 100 and help to achieve miniaturization of the multi-feed antenna.

[0074] In the embodiment provided by the present application, the multiple feeding probes 200 can be independent of each other, each feeding probe 200 is fed and works separately, and when each feeding probe 200 works separately, the multi-feed antenna can work in a similar radiation mode and have a similar radiation pattern. When the shape of the radiator 100 is approximately square and the multiple feeding probes 200 are respectively arranged at the vertex positions, if any one of the multiple feeding probes 200 is excited, the polarization mode of the antenna can be +45° polarization, and if the port located at the diagonal position of the feeding probe 200 is excited, the polarization mode of the antenna can be -45° polarization, so that the multi-feed antenna can be applied to ±45° polarization scenes. Since the structure formed by the multiple feeding probes 200 and the radiator 100 has horizontal symmetry and vertical symmetry, and the degree of symmetry is relatively high, when the multi-feed antenna is working, the symmetry of the multi-feed antenna is not easily destroyed, and the isolation between the multiple feeding ports can be improved.

[0075] Fig. 9The S parameter simulation diagram of the multi-feed antenna provided in the embodiment of the present application, the multi-feed antenna can operate in the frequency range of 1.71GHz to 2.17GHz, and excite any one of the multiple feeding probes 200, or the port corresponding to the excited feeding probe is called port 1, the echo coefficient |S11|≤-14dB, the coupling coefficient between port 1 and the other three ports |S12|≤-20dB, |S13|≤-20dB, |S14|≤-20dB, port 1 has a lower echo loss, and there is good isolation between port 1 and the other three ports. Since the multi-feed antenna has horizontal symmetry and vertical symmetry, when any one of the other three ports is excited, it can have the same or similar radiation effect as the exciting port 1, and examples are not given one by one here.

[0076] Fig.10 The gain curve diagram of the multi-feed antenna provided in the embodiment of the present application. Fig.10 As shown, when any one of the multiple feeding ports is excited, the main polarization can be 45° polarization, and cross polarization will be generated in the direction perpendicular to the main radiation direction, that is, -45° polarization. Within the working bandwidth of the multi-feed antenna, the intensity values ​​of the 45° polarization and the -45° polarization are quite different, that is, the cross-polarization component of the multi-feed antenna is lower and the polarization purity is higher.

[0077] Fig.11 The directional diagram of the multi-feed antenna provided in the embodiment of the present application, wherein: Fig.11 (a) is the radiation pattern in the vertical plane. Fig.11 (b) is the radiation pattern in the horizontal plane. The maximum value of the pattern deviates from the normal direction to a certain extent, about 10 degrees. The directivity at an angle of 0 degrees is in the range of 3 to 5.2dBi, and the cross-polarization at an angle of 0 degrees is below -21dB. The far-field radiation performance such as beam width, gain and cross-polarization is good.

[0078] The present application also provides a communication device, which may include the above-mentioned Figures 1 to 8 Any of the multi-feed antennas described.

[0079] The communication device may be a terminal device, which may be a means of transportation or an intelligent device, such as a drone, an unmanned transport vehicle, a robot, a car, a computer, a laptop computer, a tablet computer, etc. The terminal device may include at least one radar, which may include any of the above-mentioned series-fed antennas.

[0080] The multi-feed antenna can also be used in medical imaging, communication base stations or satellite antennas, etc., and this application does not make any specific limitations on this.

[0081] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A multi-feed antenna, characterized in that: include: Radiator; A reflector, wherein the projection of the radiator on the plane where the reflector is located in a direction perpendicular to the reflector is located in the area where the reflector is located; A plurality of feeding probes, at least part of which is located between the radiator and the reflecting plate, and the plurality of feeding probes are used to couple and feed the radiator individually; A plurality of metal walls are arranged between the radiator and the reflector, one end of the metal wall close to the radiator is connected to the radiator, and the plurality of metal walls are respectively arranged between two adjacent feeding probes.

2. The multi-feed antenna according to claim 1, characterized in that: The overall structure formed by the radiator and the feeding probe is axisymmetric about a first axis and a second axis respectively. The first axis and the second axis are parallel to the radiator, and the first axis is perpendicular to the second axis.

3. The multi-feed antenna according to claim 1 or 2, characterized in that: The distance between the metal wall and the reflection plate is greater than 0 and less than 0.1 times of the wavelength corresponding to the central operating frequency of the multi-feed antenna.

4. The multi-feed antenna according to any one of claims 1 to 3, characterized in that: The feeding probe includes a first part and a second part, the first part is parallel to the radiator, the second part is perpendicular to the radiator, and the second part is arranged on a side of the first part close to the reflection plate.

5. The multi-feed antenna according to claim 4, characterized in that: The first portion is in a straight line shape or a broken line shape.

6. The multi-feed antenna according to claim 4 or 5, characterized in that: The radiator comprises an opening, at least part of the second portion passes through the opening, and the first portion is located on a side of the radiator away from the reflector, or, A side of the radiator close to the reflection plate comprises a groove, and at least a part of the first part is arranged in the groove.

7. The multi-feed antenna according to any one of claims 1 to 6, characterized in that: The projection of the feeding probe along a direction perpendicular to the radiator on the plane where the radiator is located is a first projection, the first projection is located outside the region where the radiator is located, and the shortest distance between the first projection and the radiator is less than 0.1 working wavelength; or, At least a portion of the first projection is located within the region where the radiator is located.

8. The multi-feed antenna according to any one of claims 1 to 7, characterized in that: The radiator is square, rectangular or polygonal.

9. The multi-feed antenna according to any one of claims 1 to 8, characterized in that: The radiator includes a plane portion and a bent portion, the bent portion is arranged at an edge of the plane portion, and a plane where the bent portion is located forms a certain angle with the plane portion.

10. The multi-feed antenna according to any one of claims 1 to 9, characterized in that: The projection of the metal wall along a direction perpendicular to the radiator on the plane where the radiator is located is located in the area where the radiator is located.

11. The multi-feed antenna according to any one of claims 1 to 10, characterized in that: The projection of the metal wall on the radiator along a direction perpendicular to the radiator is in a cross shape.

12. A communication device, characterized in that: It comprises the multi-feed antenna as claimed in any one of claims 1 to 11.

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