A full-duplex filtering antenna array

Abstract

The present invention provides a full-duplex filtering antenna array, which includes an antenna body, which is made of a metal material, and has a first cavity and a second cavity in the antenna body, the first cavity and the second cavity are separated by a partition, and the partition is provided with a cross-coupling slot connecting the first cavity and the second cavity, one side of the antenna body is provided with two first feeding slots and a second feeding slot connected to the first cavity, the two feeding slots are of the same size and extend in directions perpendicular to each other, and the other side of the antenna body is provided with at least two first radiation slots and at least two second radiation slots connected to the second cavity, the extension directions of each first radiation slot are parallel or the same, the extension directions of each second radiation slot are parallel or the same, and the extension directions of the first radiation slot and the second radiation slot are perpendicular to each other. The antenna structure of this scheme has high integration and small overall size, and has the characteristics of high gain, high efficiency and high isolation.

Description

Technical Field

[0001] The invention belongs to the technical field of antennas, and in particular relates to a full-duplex filtering antenna array. Background Art

[0002] A full-duplex filtering antenna is a full-duplex antenna with filtering performance. Full-duplex means that both communicating parties can transmit and receive signals at the same time. Traditional RF front-ends generally use a design method in which the antenna, duplexer, filter, etc. are independently designed, and then the matching network is used to match the independent components to 50 ohms, and then the antenna is cascaded with the duplexer or filter. This makes the entire RF front-end large and heavy, and will also increase more transmission losses. Not only that, the bandwidth limitation of the matching network will also cause the antenna's performance to deteriorate out of band.

[0003] The duplex filter antenna combines the advantages of the duplex antenna and the filter antenna. It can realize duplex communication with one antenna and has the function of a filter antenna. The duplex filter antenna adopts a joint design of the radiation unit, duplexer and filter. Compared with the independently designed radiation unit and filter network in the traditional RF front end, the duplex filter antenna has a more compact structure and higher integration. At the same time, it can also improve the working bandwidth, frequency selectivity, gain stability and other aspects of performance. In addition, the duplex filter antenna can also improve the spectrum utilization. With its unique characteristics, the duplex filter antenna has been widely used in mobile communications, regional wireless networks, satellite communications and other wireless communication systems that require the communication RF front end to be small in size, light in weight and low in cost.

[0004] However, the duplex filter antenna commonly used in the related art has the problem of being large in size and being unable to simultaneously meet the requirements of gain, efficiency and isolation. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a full-duplex filtering antenna array with high integration and small overall size, and has the characteristics of high gain, high efficiency and high isolation.

[0006] To solve the above technical problems, the present invention is implemented as follows: a full-duplex filtering antenna array is provided, comprising an antenna body, the antenna body is made of a metal material, a first cavity and a second cavity are provided in the antenna body, the first cavity and the second cavity are separated by a partition, the partition is provided with a cross-coupling slot connecting the first cavity and the second cavity, a first feeding slot and a second feeding slot connected to the first cavity are provided on one side of the antenna body, the two feeding slots are of the same size and extend in directions perpendicular to each other, at least two first radiation slots and at least two second radiation slots connected to the second cavity are provided on the other side of the antenna body, the extension directions of the first radiation slots are parallel or the same, the extension directions of the second radiation slots are parallel or the same, and the extension directions of the first radiation slots and the second radiation slots are perpendicular to each other.

[0007] Further, the cross coupling slot includes a first coupling slot and a second coupling slot perpendicular to and crossing the first coupling slot, the first coupling slot extends in a direction parallel to the first feeding slot, and the second coupling slot extends in a direction parallel to the second feeding slot.

[0008] Further, an extension direction of the first radiation slot is parallel to an extension direction of the first feeding slot, and an extension direction of the second radiation slot is parallel to an extension direction of the second feeding slot.

[0009] Further, the first radiation slots are arranged in at least two rows along the extension direction thereof, and the first radiation slots are arranged in at least two columns along the extension direction of the second radiation slots;

[0010] The second radiation slots are arranged in at least two rows along the extension direction thereof, and the second radiation slots are arranged in at least two columns along the extension direction of the first radiation slots.

[0011] Further, the second radiation slots in the same column are located between the first slots in adjacent rows, and the second radiation slots in the same row are located between the first slots in adjacent columns.

[0012] Furthermore, the first radiation slots and the second radiation slots are both arranged in five rows and six columns.

[0013] Further, the antenna body includes a bottom cover, a first cavity structure and a second cavity structure, the bottom cover covers the first cavity structure, the bottom cover and the first cavity structure together form the first cavity, the partition is the part of the first cavity structure away from the bottom cover, the first feeding slot and the second feeding slot are opened on the bottom cover, the second cavity structure is arranged on the side of the first cavity structure away from the bottom cover, the second cavity structure and the partition together form the second cavity, the second cavity structure includes a radiation panel located on the side away from the first cavity structure, and the first radiation slot and the second radiation slot are opened on the radiation panel.

[0014] Furthermore, the antenna body also includes a first enclosure structure and a second enclosure structure arranged on the side of the bottom cover away from the first cavity structure, the first enclosure structure encloses the outer periphery of the first feeding slot, and the second enclosure structure encloses the outer periphery of the second feeding slot.

[0015] Furthermore, the cross coupling slot is located at the center of the partition.

[0016] Furthermore, the overall layout formed by the first radiation slot and the second radiation slot is both an axially symmetrical structure and a centrally symmetrical structure.

[0017] Compared with the prior art, the full-duplex filtering antenna array in the present invention has the following beneficial effects:

[0018] Two groups of orthogonal signals with different polarizations can be fed in from two feeding slots, and the feeding method is simpler. The first cavity, the second cavity and the partition with a cross-coupling slot together form a filtering structure. The first cavity and the second cavity form a two-stage filter. Each cavity can transmit two mutually orthogonal modes at the same time, so that the metal cavity is not only used as a resonator of the filter, but also as an OMT (orthogonal mode converter) structure to simultaneously transmit two orthogonal signals. The first radiation slot and the second radiation slot can radiate the two signals. The antenna of this scheme is made of all-metal structure, and through feeding slot feeding, two metal cavities filtering and serving as OMT structure, and mutually perpendicular first radiation slots and second radiation slots radiation, the antenna structure can be highly integrated and small in overall size, with the characteristics of high gain, high efficiency and high isolation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of a full-duplex filtering antenna array in an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the exploded structure of a full-duplex filtering antenna array from a first viewing angle in an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of the decomposed structure of the full-duplex filtering antenna array from a second perspective in an embodiment of the present invention;

[0022] Figure 4 This is a physical sample diagram of a full-duplex filtering antenna array in an embodiment of the present invention: the upper right portion of the diagram is the overall structure, and the lower portion of the diagram from left to right is the second cavity structure, the first cavity structure, and the bottom cover structure;

[0023] Figure 5 It is a comparison diagram of the simulated main polarization (Sim.co-pol), simulated cross polarization (Sim.X-pol), actual measured main polarization (Mea.co-pol) and actual measured cross polarization (Mea.X-pol) of the full-duplex filter antenna array in the embodiment of the present invention.

[0024] In the accompanying drawings, the reference numerals represent: 1, bottom cover; 11, first feeding slot; 12, second feeding slot; 2, first cavity structure; 21, partition; 211, first coupling slot; 212, second coupling slot; 3, second cavity structure; 31, radiation panel; 311, first radiation slot; 312, second radiation slot; 4, first enclosure structure; 5, second enclosure structure. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] Example:

[0027] In this embodiment, combined with Figure 1-3 The full-duplex filtering antenna array includes an antenna body, which is made of a metal material. The antenna body has a first cavity and a second cavity, the first cavity and the second cavity are separated by a partition 21, and the partition 21 is provided with a cross-coupling slot connecting the first cavity and the second cavity. One side of the antenna body is provided with two first feeding slots 11 and a second feeding slot 12 connected to the first cavity, the two feeding slots are of the same size and extend in directions perpendicular to each other, and the other side of the antenna body is provided with at least two first radiation slots 311 and at least two second radiation slots 312 both connected to the second cavity, the extension directions of the first radiation slots 311 are parallel or the same, the extension directions of the second radiation slots 312 are parallel or the same, and the extension directions of the first radiation slots 311 and the second radiation slots 312 are perpendicular to each other.

[0028] Two groups of orthogonal signals with different polarizations can be fed in from two feeding slots, and the feeding method is simpler. The first cavity, the second cavity and the partition with a cross-coupling slot together form a filtering structure. The first cavity and the second cavity form a two-stage filter. Each cavity can transmit two mutually orthogonal modes at the same time, so that the metal cavity is not only used as a resonator of the filter, but also as an OMT (orthogonal mode converter) structure to simultaneously transmit two orthogonal signals. The first radiation slot 311 and the second radiation slot 312 can radiate the two signals. The antenna of this scheme is made of all-metal structure, and through feeding through the feeding slot, filtering by two metal cavities and acting as an OMT structure, and radiation by the mutually perpendicular first radiation slot 311 and the second radiation slot 312, the antenna structure can be highly integrated and small in overall size, with the characteristics of high gain, high efficiency and high isolation.

[0029] In this embodiment, the antenna body includes a bottom cover 1, a first cavity structure 2 and a second cavity structure 3. The bottom cover 1 covers the first cavity structure 2. The bottom cover 1 and the first cavity structure 2 enclose a first cavity. The partition is a portion of the first cavity structure 2 away from the bottom cover 1. The first feeding slot 11 and the second feeding slot 12 are provided on the bottom cover 1. The second cavity structure 3 is provided on the side of the first cavity structure 2 away from the bottom cover 1. The second cavity structure 3 and the partition enclose a second cavity. The second cavity structure 3 includes a radiation panel 31 located away from the first cavity structure 2. The first radiation slot 311 and the second radiation slot 312 are provided on the radiation panel 31. The bottom cover 1 and the first cavity structure 2, and the first cavity and the second cavity structure 3 can be fixed by screw connection, or by welding, clamping, etc. In this embodiment, the bottom cover 1 is plate-shaped, and the first cavity structure 2 and the second cavity structure 3 are both structures with a groove on one side. The groove and the corresponding structure are covered to form a cavity. Each part is made of copper material. The components of the antenna body described above are only examples. It should be understood that no matter how the antenna body is divided, as long as the antenna body finally assembled is the first cavity, the second cavity, the cross-coupling slot, the feeding slot, the first radiation slot 311 and the second radiation slot 312 described above, they are all within the protection scope of the present invention. For example, in some embodiments, the partition of the first cavity structure 2 and the side wall structure connected to the partition can be separated, and the radiation panel 31 of the second cavity structure 3 and the side wall connected to the radiation panel 31 can also be separated. The whole formed by the final structures is the same as the example structure of this embodiment. In some embodiments, the material of the antenna body can also be selected from aluminum alloy materials, silver materials, gold materials, titanium alloy materials, etc.

[0030] The antenna body further includes a first enclosure structure 4 and a second enclosure structure 5 arranged on the side of the bottom cover 1 away from the first cavity structure 2 . The first enclosure structure 4 encloses the periphery of the first feeding slot 11 , and the second enclosure structure 5 encloses the periphery of the second feeding slot 12 .

[0031] In this embodiment, the outer contour of the top view of the antenna body is a square, and the bottom cover 1, the partition and the radiation panel 31 are parallel to each other. Therefore, the bottom cover 1, the partition and the radiation panel 31 are all square, and the first cavity and the second cavity are both rectangular cavities with square bottom surfaces and facing each other. The two feeding gaps are respectively parallel to the edges of the bottom cover 1, and the two feeding gaps are symmetrically distributed with the diagonal of the bottom cover 1 as the symmetry axis, and the two feeding gaps are respectively facing the centers of the corresponding edges of the bottom cover 1. The cross-coupling slit is located at the center of the partition, and the cross-coupling slit includes a first coupling slit 211 and a second coupling slit 212 that is perpendicular to and crosses the first coupling slit 211. The extension direction of the first coupling slit 211 is parallel to the first feeding slit 11, and the extension direction of the second coupling slit 212 is parallel to the second feeding slit 12. Specifically, the first coupling slit 211 and the second coupling slit 212 have the same size and intersect at the center.

[0032] The extension direction of the first radiation slot 311 is parallel to the extension direction of the first feeding slot 11, and the extension direction of the second radiation slot 312 is parallel to the extension direction of the second feeding slot 12; the first radiation slot 311 is arranged in at least two rows along its extension direction, and the first radiation slot 311 is arranged in at least two columns along the extension direction of the second radiation slot 312; the second radiation slot 312 is arranged in at least two rows along its extension direction, and the second radiation slot 312 is arranged in at least two columns along the extension direction of the first radiation slot 311; the second radiation slots 312 in the same column are located between the first slots in adjacent rows, and the second radiation slots 312 in the same row are located between the first slots in adjacent columns. Specifically, in the present embodiment, preferably, the first radiation slots 311 and the second radiation slots 312 are each provided with five rows and six columns, and the overall layout formed by the first radiation slots 311 and the second radiation slots 312 together is both an axially symmetrical structure and a centrally symmetrical structure, and the arrangement of each second radiation slot 312 is equivalent to each first radiation slot 311 rotating 90 degrees around the center of symmetry, and the center of symmetry is the center of the radiation panel 31. Here, the arrangement of each first radiation slot 311 is described as an example, and each first radiation slot 311 is arranged in a rectangular array, and five are arranged along a straight line in the column direction (the length direction of the first radiation slot 311), and the intervals between adjacent first radiation slots 311 in the column direction are the same, and the widths of each first radiation slot 311 in the column direction are the same but the lengths may be different. In the present solution, the lengths of the first radiation slots 311 in mutually symmetrical positions are the same, and six first radiation slots 311 are arranged at intervals in the row direction, and the lengths of the first radiation slots 311 in the same row are the same. The first radiation slot 311 and the second radiation slot 312 of the same size can form a slot pair, and the size of each slot pair is set to be different, which can achieve higher gain and impedance matching and obtain better antenna performance.

[0033] The shape of the top view of the overall structure in the antenna body can also be set to a rectangle, a circle, a pentagon, etc. The sizes of the feed slot, the coupling slot, the radiation slot, the first cavity, and the second cavity can be adaptively set according to the operating wavelength, and are not limited here. The number of rows and columns of the first radiation slot 311 and the second radiation slot 312 can be selected from two, three, four, five, six, etc., and are preferably arranged axially symmetrically, and further preferably meet the central symmetrical arrangement at the same time.

[0034] Combination Figure 4 and Figure 5 For the full-duplex filtering antenna array in the above embodiment, sample production, performance simulation and actual measurement were carried out. It can be seen that the antenna structure of this scheme has the characteristics of high gain, high efficiency and high isolation.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A full-duplex filtering antenna array, characterized in that: The antenna body comprises an antenna body, the antenna body is made of a metal material, the antenna body has a first cavity and a second cavity, the first cavity and the second cavity are separated by a partition (21), the partition (21) is provided with a cross-coupling slot connecting the first cavity and the second cavity, one side of the antenna body is provided with a first feeding slot (11) and a second feeding slot (12) connected to the first cavity, the two feeding slots are of the same size and extend in directions perpendicular to each other, the other side of the antenna body is provided with at least two first radiation slots (311) and at least two second radiation slots (312) both connected to the second cavity, the extension directions of the first radiation slots (311) are parallel or the same, the extension directions of the second radiation slots (312) are parallel or the same, and the extension directions of the first radiation slot (311) and the second radiation slot (312) are perpendicular to each other; The cross-coupling slit comprises a first coupling slit (211) and a second coupling slit (212) perpendicular to and crossing the first coupling slit (211), the first coupling slit (211) extending in a direction parallel to the first feeding slit (11), and the second coupling slit (212) extending in a direction parallel to the second feeding slit (12); The extension direction of the first radiation slot (311) is parallel to the extension direction of the first feeding slot (11), and the extension direction of the second radiation slot (312) is parallel to the extension direction of the second feeding slot (12); The first radiation slots (311) are arranged in at least two rows along their extension direction, and the first radiation slots (311) are arranged in at least two columns along the extension direction of the second radiation slots (312); the second radiation slots (312) are arranged in at least two rows along their extension direction, and the second radiation slots (312) are arranged in at least two columns along the extension direction of the first radiation slots (311), the second radiation slots (312) in the same column are located between the first radiation slots (311) in adjacent rows, and the second radiation slots (312) in the same row are located between the first radiation slots (311) in adjacent columns.

2. The full-duplex filtering antenna array according to claim 1, characterized in that: The first radiation slots (311) and the second radiation slots (312) are both arranged in five rows and six columns.

3. The full-duplex filtering antenna array according to any one of claims 1 to 2, characterized in that: The antenna body comprises a bottom cover (1), a first cavity structure (2) and a second cavity structure (3); the bottom cover (1) covers the first cavity structure (2); the bottom cover (1) and the first cavity structure (2) together form the first cavity; the partition layer (21) is a portion of the first cavity structure (2) away from the bottom cover (1); the first feeding slot (11) and the second feeding slot (12) are provided on the bottom cover (1); the second cavity structure (3) is provided on the side of the first cavity structure (2) away from the bottom cover (1); the second cavity structure (3) and the partition layer (21) together form the second cavity; the second cavity structure (3) comprises a radiation panel (31) located on the side away from the first cavity structure (2); the first radiation slot (311) and the second radiation slot (312) are provided on the radiation panel (31).

4. The full-duplex filtering antenna array according to claim 3, characterized in that: The antenna body further comprises a first enclosure structure (4) and a second enclosure structure (5) which are arranged on the side of the bottom cover (1) facing away from the first cavity structure (2), wherein the first enclosure structure (4) encloses the outer periphery of the first feeding slot (11), and the second enclosure structure (5) encloses the outer periphery of the second feeding slot (12).

5. The full-duplex filtering antenna array according to claim 3, characterized in that: The cross coupling slit is located at the center of the partition (21).

6. The full-duplex filtering antenna array according to claim 3, characterized in that: The overall layout formed by the first radiation slot (311) and the second radiation slot (312) is both an axially symmetrical structure and a centrally symmetrical structure.

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