Antenna, antenna device and communication base station

Abstract

An antenna, an antenna device and a communication base station belong to the technical field of antennas and aim to reduce coupling among multi-band signals, the antenna is configured to radiate a signal of a first band and comprises at least one single-polarized radiator, and the single-polarized radiator comprises a radiation structure and a plurality of radiation structures, comprising a first dielectric substrate and a radiation arm located on one side of the first dielectric substrate, the radiation arm comprises a plurality of radiation branches, and the plurality of radiation branches are sequentially connected to form a ring; the feed structure is connected with the radiation structure and is configured to feed an electric signal into the radiation structure; and the filtering structure is at least loaded between the radiation branches and is configured to weaken the influence of the antenna on a signal of a second frequency band, and no overlapped frequency band exists between the second frequency band and the first frequency band.

Description

Antenna, antenna device and communication base station TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of antennas, and in particular to an antenna, an antenna device and a communication base station. BACKGROUND

[0002] With the iterative development of mobile communication technology, factors such as Massive MIMO, new frequency bands, frequency reuse, 2G / 3G / 4G / 5G system coexistence, etc. have caused the number of antennas required in the base station to increase dramatically. Therefore, it is generally necessary to add more antennas to the existing communication base station, and different antennas radiate signals of different frequency bands. In this way, multiple antennas are in the same base station, and the signals between different frequency bands will be coupled.

[0003] SUMMARY

[0004] In a first aspect, the present disclosure provides an antenna, wherein the antenna is configured to radiate signals of a first frequency band, and comprises at least one single-polarized radiator, the single-polarized radiator comprising:

[0005] a radiation structure comprising a first dielectric substrate and a radiation arm located on one side of the first dielectric substrate, the radiation arm comprising a plurality of radiation branches, and the plurality of radiation branches are sequentially connected to form a ring shape;

[0006] a feeding structure connected to the radiation structure and configured to feed electrical signals to the radiation structure; and

[0007] a filtering structure loaded at least between adjacent radiation branches and configured to weaken the influence of the antenna on signals of a second frequency band, and the second frequency band does not have an overlapping frequency band with the first frequency band.

[0008] Exemplarily, the plurality of radiation branches are sequentially connected to form a ring polygon, and a normal projection of the filtering structure on the first dielectric substrate is located on each side of the ring polygon.

[0009] Exemplarily, the filtering structure comprises at least one inductive element connected in series between adjacent two radiation branches.

[0010] Exemplarily, the filtering structure further comprises an open-circuit branch connected to at least one of the radiation branches.

[0011] Exemplarily, the number of inductive elements is greater than the number of open-circuit branches.

[0012] Exemplarily, there are a plurality of inductive elements connected in series between at least one pair of adjacent radiation branches.

[0013] Exemplarily, the plurality of radiation branches comprises a first radiation branch connected with the feeding structure, and a plurality of second radiation branches other than the first radiation branch.

[0014] The number of inductive elements connected in series between the first radiation branch and the second radiation branch is less than the number of inductive elements connected in series between each adjacent two of the second radiation branches.

[0015] Exemplarily, the inductive element comprises a wire-wound inductor, the radiation arm is located at a first side of the first dielectric substrate, and the wire-wound inductor is located at a second side of the first dielectric substrate opposite to the first side.

[0016] The wire-wound inductor comprises a first end and a second end, and the first end and the second end pass through the first dielectric substrate and are connected with adjacent two of the radiation branches.

[0017] Exemplarily, a shape of a projection of the inductive element on the first dielectric substrate is a rectangular spiral.

[0018] Exemplarily, the inductive element comprises a thin-film inductor, and the thin-film inductor is located at the same side of the first dielectric substrate as the radiation arm.

[0019] Exemplarily, the radiation branch is L-shaped, a first distance from a connection point of the open-circuit branch and the radiation branch to an end point of the radiation branch is less than 1 / 2 of a second distance from the inductive element to the end point of the radiation branch.

[0020] Exemplarily, the open-circuit branch comprises a first branch and a second branch, and projections of the first branch and the second branch on the dielectric substrate are connected in an L shape.

[0021] The first branch is connected with the radiation branch, the second branch is parallel to the radiation branch, and a length of the first branch is less than a length of the second branch.

[0022] Exemplarily, the plurality of radiation branches comprises a first radiation branch connected with the feeding structure, and a plurality of second radiation branches other than the first radiation branch.

[0023] The open-circuit branch is connected with the second radiation branch.

[0024] Exemplarily, the feeding structure comprises a pair of radiation arms, and the feeding structure comprises:

[0025] a second dielectric substrate arranged orthogonally to the first dielectric substrate; and

[0026] A balun feeding structure is located on one side of the second dielectric substrate, and includes a balun and a feeding line;

[0027] The two radiation arms are coupled to the balun feeding structure or directly contacted with the balun feeding structure.

[0028] Exemplarily, the single-polarized radiator further includes:

[0029] A coupling structure is arranged on the first dielectric substrate and connected with the balun feeding structure, and the coupling structure includes a first coupling member and a second coupling member arranged orthogonally, and the first coupling member and the second coupling member are both L-shaped in the orthographic projection on the first dielectric substrate.

[0030] The radiation branch of one of the two radiation arms overlaps with the first coupling member in the orthographic projection on the first dielectric substrate, and the radiation branch of the other radiation arm overlaps with the second coupling member in the orthographic projection on the first dielectric substrate.

[0031] Exemplarily, the two single-polarized radiators include two 45° and -45°.

[0032] The radiation structures of the two single-polarized radiators are orthogonal.

[0033] A second aspect of the present disclosure provides an antenna device, which includes:

[0034] A reflecting plate;

[0035] A plurality of antennas are arranged on the reflecting plate, and include at least one first antenna and at least one second antenna, the highest frequency band of the working frequency band of the first antenna is smaller than the lowest frequency band of the working frequency band of the second antenna, and the first antenna and the second antenna share the same aperture.

[0036] The first antenna adopts the antenna of any one of the first aspect, and the orthographic projection of the first antenna and the second antenna on the reflecting plate overlaps.

[0037] Exemplarily, a first metal baffle is connected to opposite sides of the reflecting plate, and the first metal baffle extends towards the direction where the antenna is located.

[0038] Exemplarily, the antenna device further includes:

[0039] An isolation plate is located between the reflecting plate and the second antenna.

[0040] A plurality of second metal baffles are respectively connected to the four peripheral edges of the isolation plate and extend towards the direction where the second antenna is located.

[0041] In a third aspect, the present disclosure provides a communication base station, wherein the communication base station comprises a plurality of the antenna device according to any one of the second aspect, and the plurality of the antenna devices are arranged in an array.

[0042] The antenna provided by the present disclosure is configured to radiate signals of a first frequency band, and comprises at least one single-polarized radiator, the single-polarized radiator comprising a radiating structure, a feeding structure and a filtering structure; wherein the radiating structure comprises a first dielectric substrate and a radiating arm located on one side of the dielectric substrate, the radiating arm comprising a plurality of radiating branches, and the plurality of radiating branches are connected in sequence to form a ring shape; the feeding structure is connected with the radiating structure and is configured to feed an electric signal to the radiating structure; and the filtering structure is loaded at least between adjacent radiating branches and is configured to weaken the influence of the antenna on signals of a second frequency band, and the second frequency band does not have an overlapping frequency band with the first frequency band. By loading the filtering structure on the radiating branch, the influence of the antenna on signals of the second frequency band can be avoided through the filtering structure, so that when other antennas radiate signals of the second frequency band, the filtering function can be played on the other antennas to avoid the coupling of signals between different frequency bands. Thus, the inter-frequency electromagnetic transparency of different frequency bands can be realized.

[0043] The above description is only a summary of the technical solutions of the present disclosure, in order to more clearly understand the technical means of the present disclosure, the specific embodiments of the present disclosure can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present disclosure more obvious and easy to understand, the following will specifically describe the embodiments of the present disclosure.

[0044] Brief Description of Drawings

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the related art, the following will briefly introduce the drawings needed to be used in the embodiment or related art description. Obviously, the drawings in the following description are some embodiments of the present disclosure, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor. It should be noted that the proportions in the drawings are only for illustration and do not represent the actual proportions.

[0046] Fig. 1 shows a cross-sectional structure schematic diagram of an antenna;

[0047] Fig. 2 shows a structure schematic diagram of a plane where the radiating structure in the antenna of Fig. 1 is located;

[0048] Figs. 3-5 respectively show plane schematic diagrams of three kinds of antennas;

[0049] Figs. 6 and 7 show plane structure diagrams of two other radiating structures;

[0050] Fig. 8 shows a local schematic diagram of a position where an inductive element and a radiating branch are connected in series;

[0051] Fig. 9 shows a cross-sectional structure diagram of a radiating structure;

[0052] Figs. 10 to 13 show structure diagrams of still other radiating structures;

[0053] Fig. 14 shows a cross-sectional structure connection diagram between a radiating structure and a feeding structure;

[0054] Fig. 15 shows a planar structure diagram of a dual-polarized antenna;

[0055] Fig. 16 shows a perspective structure diagram of a first antenna in the antenna device;

[0056] Fig. 17 shows a perspective structure diagram of a second antenna in the antenna device;

[0057] Fig. 18 shows an overall perspective structure diagram of the antenna device;

[0058] Figs. 19a and 19b show simulation results of simulations performed on the antenna device of Example 1, Comparative Example 1, and Comparative Example 2, respectively;

[0059] Figs. 20a and 20b show simulation results of simulations performed on the antenna device of Example 2, Comparative Example 1, and Comparative Example 2, respectively;

[0060] Figs. 21a and 21b show simulation results of simulations performed on the antenna device of Example 3, Comparative Example 1, and Comparative Example 2, respectively;

[0061] Fig. 22 shows simulation results of simulations performed on the antenna device of Example 4, Comparative Example 1, and Comparative Example 2, respectively;

[0062] Fig. 23 shows simulation results of simulations performed on the antenna device of Example 5, Comparative Example 1, and Comparative Example 2, respectively;

[0063] Fig. 24 shows simulation results of simulations performed on the antenna device of Example 6, Comparative Example 1, and Comparative Example 2, respectively;

[0064] Fig. 25 shows simulation results of simulations performed on the antenna device of Example 7, Comparative Example 1, and Comparative Example 2, respectively.

[0065] Explanation of Reference Numerals:

[0066] 100 first antenna; 200 second antenna; 300 antenna device; 10 radiating structure; 20 feeding structure; 30 reflector; 40 radome; 50 filter structure; 60 coupling structure; 11 first dielectric substrate; 12 radiating arm; 121 radiating branch; 21 second dielectric substrate; 22 balun; 23 feeding line; 24 feeding point 24; 51 inductive element; 52 open-circuit branch; 1211 first radiating branch; 1212 second radiating branch; 511 rectangular spiral inductor; 512 thin-film inductor; 513 spiral coil inductor; 201 isolation plate; 202 second metal baffle; 31 first metal baffle.

[0067] DETAILED DESCRIPTION

[0068] In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are some but not all of the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present disclosure.

[0069] In the present specification, "electrically connected" and "coupled" include a case where constituent elements are connected together through an element having some electrical action. The element having some electrical action is not particularly limited as long as it can perform the transmission and reception of electrical signals between the connected constituent elements. Examples of the element having some electrical action include not only electrodes and wiring but also switching elements such as transistors, resistors, inductors, capacitors, other elements having various functions, and the like.

[0070] In the present specification, "parallel" means a state in which the angle formed by two straight lines is -10° or more and 10° or less, and thus also includes a state in which the angle is -5° or more and 5° or less. In addition, "perpendicular" means a state in which the angle formed by two straight lines is 80° or more and 100° or less, and thus also includes a state in which the angle is 85° or more and 95° or less.

[0071] Unless the context clearly requires otherwise, throughout the description and the claims, the term "comprise", "comprising", and the like are to be construed in an open, inclusive sense as "including, but not limited to".

[0072] The "same layer" in the embodiments of the present application refers to the relationship between the plurality of film layers formed by the same material after the same step (for example, one patterning process). The "same layer" here does not always mean that the thicknesses of the plurality of film layers are the same or the heights of the plurality of film layers in the cross-sectional view are the same. The annular polygon in the present specification is not strictly in the sense, but can be an approximate triangle, parallelogram, trapezoid, pentagon or hexagon, etc., and there can be some small deformations caused by tolerances.

[0073] In the embodiments of the present application, the source and the drain of the transistor are symmetrical, so the source and the drain can be interchangeable. In the embodiments of the present application, one of the source and the drain of the transistor can be referred to as a first pole, and the other of the source and the drain can be referred to as a second pole.

[0074] In the related art, more antennas are generally added to an existing communication base station, so that one communication base station can be configured with multiple antennas for radiating signals of multiple frequency bands to reduce the occupation of space. To achieve this purpose, a multi-frequency common aperture antenna has appeared, which is an antenna form that places two or more antennas working at different frequency bands or even different polarizations under the same installation aperture, so that they can work simultaneously in the same aperture plane. The multi-frequency common aperture antenna not only enables different frequency band antennas to work simultaneously, but also greatly reduces the occupied space of the antennas due to the same aperture characteristics of different antennas, so that more antennas can be accommodated in limited space resources.

[0075] However, the multi-frequency common aperture antenna usually causes serious coupling between different frequency bands, resulting in a decline in the performance of the base station antenna.

[0076] Therefore, the embodiments of the present disclosure propose an antenna, which includes at least one single-polarized radiator, the single-polarized radiator can include a radiation structure, a feed structure and a filtering structure, wherein the radiation structure includes a first dielectric substrate and a radiation arm located on one side of the dielectric substrate, the radiation arm includes a plurality of radiation branches, and the plurality of radiation branches are sequentially connected to form a ring shape; the feed structure is connected with the radiation structure and is configured to feed an electric signal to the radiation structure; and the filtering structure is loaded at least between adjacent radiation branches and is configured to weaken the influence of the antenna on signals of a second frequency band, and the second frequency band does not have an overlapping frequency band with a first frequency band.

[0077] The filter structure loaded on the radiation branch can be used to weaken the influence of the second frequency band signal, which is different from the first frequency band signal radiated by the antenna, thereby avoiding the influence of the antenna on the second frequency band signal radiated by other antennas, so that the other antennas can be filtered when the other antennas radiate other frequency band signals, and the coupling between different frequency bands is avoided, so that when the antenna is used as one of the co-antenna antennas, the coupling between different frequency bands is reduced, thereby improving the performance of the base station antenna.

[0078] The first frequency band radiated by the antenna can be lower than the second frequency band, that is, the antenna can be a low-frequency antenna, and the filter structure can be loaded on the radiation structure of the low-frequency antenna in the co-antenna.

[0079] In the following, the antenna, the antenna device and the communication base station provided by the embodiment of the present application will be specifically described and introduced with reference to the accompanying drawings.

[0080] In an embodiment, the present disclosure provides an antenna, as shown in FIG. 1 and FIG. 2, FIG. 1 shows a cross-sectional structure schematic diagram of an antenna, and FIG. 2 shows a structure schematic diagram of a plane in which the radiation structure 10 in the antenna of FIG. 1 is observed, as shown in FIG. 1 and FIG. 2, the antenna of the embodiment is mainly configured to radiate a first frequency band signal, which can include at least one single-polarized radiator including the following structure:

[0081] The radiation structure 10 includes a first dielectric substrate 11 and a radiation arm 12 located on one side of the first dielectric substrate 11, and the radiation arm 12 includes a plurality of radiation branches 121 connected in sequence to form a ring shape;

[0082] The feeding structure 20 is connected with the radiation structure 10 and is configured to feed an electric signal to the radiation structure 10; and

[0083] The filter structure 50 is loaded at least between adjacent radiation branches 121 and is configured to weaken the influence of the antenna on a second frequency band signal, and the second frequency band signal does not have an overlapping frequency band with the first frequency band.

[0084] The single-polarized radiator can be understood as a radiator that can radiate a signal in a single polarization direction, such as a signal in a positive 45° polarization direction, or a signal in a negative 45° polarization direction, or a signal in a horizontal polarization direction, or a signal in a vertical polarization direction. The antenna in the embodiment can include one single-polarized radiator, or two single-polarized radiators, and when two single-polarized radiators are included, the antenna can realize dual-polarized signal radiation.

[0085] Each single-polarized radiator can include a radiating structure 10, a feeding structure 20 and a filtering structure 50. The feeding structure 20 is used to feed the radiating structure 10 with an electrical signal, and the radiating structure 10 is used to radiate the signal outward based on the electrical signal. In an example, the antenna can also be used to receive a signal transmitted by an external antenna.

[0086] The feeding structure 20 can include a second dielectric substrate 21 and a feeding line 23 arranged on one side of the second dielectric substrate 21. As shown in FIG. 2, the second dielectric substrate 21 can be orthogonal to the first dielectric substrate 11, and the feeding line 23 can feed the radiating structure 10 with an electrical signal in the normal direction of the first dielectric substrate 11. The position where the feeding line 23 and the radiating structure 10 are electrically coupled can be referred to as a feeding point 24. The feeding method between the feeding line 23 and the radiating structure 10 can be coupled feeding, direct feeding, etc.

[0087] The radiating structure 10 can include a first dielectric substrate 11 and a radiating arm 12 arranged on one side of the first dielectric substrate 11. The first dielectric substrate 11 can be used to support and fix the radiating arm 12. The shape of the first dielectric substrate 11 can be set according to requirements, such as a circular shape, a square shape, etc. The material of the first dielectric substrate 11 can be determined according to the required dielectric constant, such as FR-4 rated material, such as glass fiber epoxy resin material with a dielectric constant of 4.4 and a loss tangent of 0.02.

[0088] The radiating arm 12 can be arranged on the side of the first dielectric substrate 11 close to the feeding structure 20, or on the side of the first dielectric substrate 11 away from the feeding structure 20. As shown in FIG. 2, the radiating arm 12 can include a pair of radiating arms 12, which can be symmetrically distributed on the first dielectric substrate 11. For example, the radiating arm 12 has a feeding point 24 between the radiating arm 12 and the feeding structure 20, and the two radiating arms 12 can be centered on the feeding point 24 and be centrally symmetric.

[0089] The radiation arm 12 can include a plurality of radiation branches 121 connected in sequence, so that the radiation arm 12 is annular, for example, a circular ring, an elliptical ring, a ring polygon, etc., wherein the ring polygon can be a ring quadrilateral, a ring pentagon, a ring hexagon, etc., which can be a regular polygon or a non-regular polygon. The connection in sequence can mean that the radiation branches 121 are connected end to end. Specifically, in the radiation structure 10, two radiation branches 121 connected to the feed point 24 can be included in the plurality of radiation branches 121, as shown in FIG. 2, which can be located in two radiation arms 12 respectively, or two radiation branches 121 connected to the feed point 24 can be included in the same radiation arm 12. Wherein the plurality of radiation branches 121 can form a closed polygon. As shown in FIG. 2, the plurality of radiation branches 121 are connected to form a ring quadrilateral, thereby forming a ring-shaped radiation arm 12.

[0090] The shapes and sizes of the plurality of radiation branches 121 can be slightly different, for example, the plurality of radiation branches 121 can include strip-shaped radiation branches 121, L-shaped radiation branches 121, and “[” shaped radiation branches 121, etc. Alternatively, the shapes and sizes of the plurality of radiation branches 121 can be uniform, for example, as shown in FIG. 2, the plurality of radiation branches 121 are all L-shaped, and the sizes of the plurality of radiation branches 121 can be consistent.

[0091] The radiation branches 121 can be formed on the first dielectric substrate 11 by a metal material, for example, copper, silver, gold, etc.

[0092] The filter structure 50 can be loaded between at least adjacent radiation branches 121, that is, connected between the radiation branches 121, thereby forming a series connection assembly of the radiation branches 121, the filter structure 50, and the radiation branches 121, so that the filter structure 50 can realize isolation between signals of multiple frequency bands. In some examples, the filter structure can also be loaded on each radiation branch 121 or on part of the radiation branches 121. In one example, the filter structure 50 can be loaded on the radiation branches 121 in the form of being connected to the radiation branches 121, thereby forming an open circuit branch 52 of the radiation branches 121. Of course, in other examples, the filter structure 50 can also be loaded on the radiation branches 121 in the form of a combination of the above two loading methods, that is, both a metal component connected to the radiation branches 121 and a series connection assembly connected between the radiation branches 121.

[0093] It should be noted that the loading here can be electrical loading, that is, the filter structure 50 and the radiation branches 121 have an electrical connection relationship.

[0094] The filter structure 50 loaded on the radiation branch 121 can be formed of a metal material, which can include at least one of a metal coil and a metal patch. When the filter structure 50 is a metal coil, the metal coil can function as an inductor, thereby achieving a filtering characteristic.

[0095] In the embodiment, the total length of the radiation arm 12 and the area of the polygonal ring enclosed by the radiation branch 121 are set such that the antenna radiates signals of the first frequency band.

[0096] In the embodiment, the filter structure 50 can be configured to weaken the influence of the antenna on signals of the second frequency band. It can be understood that the filter structure 50 can reduce its crosstalk to the second frequency band, avoid coupling between the second frequency band and the first frequency band, and make the signals of the second frequency band more pure and the directivity pattern more optimal. Of course, the filter structure 50 loaded does not affect the radiation performance of the signals of the first frequency band. The second frequency band and the first frequency band can not have the same frequency point. Specifically, the first frequency band can be lower than the second frequency band, that is, the highest frequency point of the first frequency band can be lower than the lowest frequency point of the second frequency band. In this way, the filter structure 50 can weaken the influence of the antenna on high-frequency signals radiated by other antennas. Alternatively, the first frequency band can be higher than the second frequency band, that is, the lowest frequency point of the first frequency band can be lower than the highest frequency point of the second frequency band. In this way, the filter structure 50 can weaken the influence of the antenna on low-frequency signals radiated by other antennas.

[0097] According to actual needs, the antenna configured with the filter structure 50 can be a low-frequency antenna. In this way, the first frequency band can be a low frequency band, and the size of the radiation structure 10 can be large enough to meet the loading of the filter structure 50.

[0098] In the embodiment, the antenna can further include a reflector 30 and a radome 40. The reflector 30 and the radiation structure 10 can be located on opposite sides of the feed structure 20, and the radome 40 is located on a side of the radiation structure 10 away from the feed structure 20. The orthographic projection of the radiation structure 10 and the feed structure 20 on the reflector 30 is located within the reflector 30, and the orthographic projection of the radiation structure 10 and the feed structure 20 on the reflector 30 is located within the radome 40. The orthographic projection of the radome 40 on the plane where the reflector 30 is located can overlap the reflector 30. The overlap can mean coincidence or partial coincidence.

[0099] In an example, the dielectric constant of the material used for the radome 40 is 4.2, and the radome 40 has a spacing with the radiating structure 10, which can be 10mm-20mm. The spacing can refer to the vertical distance between the radome 40 and the radiating structure 10 in the normal direction of the first dielectric substrate 11. For example, the spacing between the radome and the radiating structure 10 can be 10mm, 12mm, 14mm, 16mm, 17mm, 18mm, or 20mm.

[0100] With the antenna of the present example, the influence of the antenna on the signal of the second frequency band can be weakened by the filtering structure 50, so that when other antennas radiate signals of the second frequency band, the filtering structure 50 can play a filtering function on the other antennas, thereby avoiding the coupling of signals between different frequency bands. Thus, the inter-frequency electromagnetic transparency of different frequency bands can be achieved.

[0101] In some examples, please continue to combine FIG. 2, a plurality of filtering structures 50 can be loaded on the radiating arm 12, and the plurality of filtering structures 50 can be loaded on different radiating branches 121, respectively. The spacing between the plurality of filtering structures 50 can be equal or unequal. Specifically, in order to improve the radiation performance and filtering performance of the antenna, a filtering structure 50 can be loaded on each side of the ring polygon.

[0102] As shown in FIG. 2, the plurality of radiating branches are sequentially connected to form a ring polygon, and the orthographic projection of the filtering structure 50 on the first dielectric substrate 11 is located on each side of the ring polygon.

[0103] Among them, the polygon refers to a closed figure composed of three or more line segments connected in order, which is called a polygon. According to different standards, a polygon can be divided into regular polygons and irregular polygons, convex polygons and concave polygons, etc. defined as four or more sides. The ring polygon can be understood as a figure in which the above-mentioned polygon figure is hollowed out to retain the edge, that is, the radiating arm is designed as a frame structure of the polygon.

[0104] In the present example, the filtering structure 50 on each side of the ring polygon can be understood as the orthographic projection of the filtering structure 50 on the first dielectric substrate 11, which overlaps with each side of the orthographic projection of the radiating arm 12 on the first dielectric substrate 11. Since the radiating arm 12 is sequentially connected by a plurality of radiating branches 121, the loading position of the filtering structure 50 on the radiating branch 121 can be set, so that each side of the ring polygon has a filtering structure 50.

[0105] Exemplarily, at least one filtering structure 50 can be loaded on each radiating branch 121, for example, one filtering structure 50 is loaded on each radiating branch 121.

[0106] For example, the filter structure 50 can be loaded on every two adjacent radiating branches 121, for example, the filter structure 50 is loaded at the connection of every two adjacent radiating branches 121, which is located on the edge of the loop polygon, so that each edge has the filter structure 50.

[0107] In some embodiments, the filter structure 50 loaded on different radiating branches 121 can be the same, for example, both include a metal coil, or both include a metal coil and a metal patch.

[0108] In some embodiments, the filter structure 50 loaded on different radiating branches 121 can be different, for example, the filter structure 50 loaded on one radiating branch 121 includes a metal coil, and the filter structure 50 loaded on another radiating branch 121 includes a metal patch. Alternatively, the filter structure 50 loaded on one radiating branch 121 includes a metal coil, and the filter structure 50 loaded on another radiating branch 121 includes a metal patch and a metal coil. In this way, for one radiating branch 121, the filter structure 50 loaded thereon can include a metal coil, or include a metal coil and a metal patch, or only include a metal patch. The specific loading manner can be seen from the subsequent examples.

[0109] In this way, the filter structure 50 can be uniformly loaded on the radiating arm 12, so that the filter structure 50 exists around the radiating arm 12, thereby achieving good filtering performance.

[0110] As described above, the filter structure 50 can be loaded on the radiating branch 121, which can be at least one of a metal coil and a metal patch. In some embodiments, the metal coil functions as an inductor, so the filter structure 50 can include an inductive element 51. Specifically, the filter structure 50 can include at least one inductive element 51 connected in series between two adjacent radiating branches 121.

[0111] Please refer to FIG. 3-FIG. 5, which respectively show the planar schematic diagrams of three kinds of antennas. FIG. 3-FIG. 5 are the structural schematic diagrams of the plane in which the radiating structure 10 in the antenna is located. As shown in FIG. 3-FIG. 5, the filter structure 50 can include an inductive element 51, which is loaded between two adjacent radiating branches 121. Specifically, the first end of the inductive element 51 is connected with one of the two adjacent radiating branches 121, and the second end is connected with the other of the two adjacent radiating branches 121, so that the radiating structure 10 is formed by the radiating branches 121 and the inductive elements 51 connected in series.

[0112] In the above embodiment, one inductive element 51 can be connected between each two adjacent radiating branches 121. In another embodiment, one inductive element 51 can be connected at each end of each radiating branch 121, and the inductive elements 51 connected at the two ends of each radiating branch 121 are connected to the adjacent radiating branches 121. In this way, one inductive element 51 is connected between each two radiating branches 121, and the number of inductive elements 51 can be equal to the number of radiating branches 121. For example, four radiating branches 121 and four inductive elements 51 are included.

[0113] In another embodiment, one or more inductive elements 51 can be connected at each end of each radiating branch 121, and the inductive elements 51 connected at the two ends of different radiating branches 121 can be independent of each other. The inductive elements 51 connected at each adjacent two radiating branches 121 are connected in series. In one example, at least one pair of adjacent two radiating branches 121 are connected in series with multiple inductive elements 51.

[0114] In one example embodiment, multiple inductive elements 51 can be connected between each two radiating branches 121, and the number of inductive elements 51 is N times the number of radiating branches 121, where N is an integer greater than 1. In another example embodiment, two inductive elements 51 can be connected between a pair of partially adjacent radiating branches 121 among the multiple radiating branches 121, so that the number of inductive elements 51 is greater than the number of radiating branches 121 and less than N times the number of radiating branches 121, where N is an integer greater than 1.

[0115] For example, as shown in FIGS. 4 and 5, in one example embodiment, at least one pair of adjacent two radiating branches 121 are connected in series with multiple inductive elements 51.

[0116] In one example, two inductive elements 51 can be connected between at least one pair of adjacent two radiating branches 121, or three inductive elements 51 can be connected. In another example, multiple inductive elements 51 can be connected between each adjacent two radiating branches 121, or multiple inductive elements 51 can be connected between a pair of partially adjacent radiating branches 121.

[0117] As shown in FIG. 4, two inductive elements 51 are connected between each adjacent two radiating branches 121, and four radiating branches 121 and eight inductive elements 51 are included. The number of inductive elements 51 is twice the number of radiating branches 121. For another example, as shown in FIG. 5, four radiating branches 121 are included, and two inductive elements 51 are connected between a pair of partially adjacent radiating branches 121, and a total of six inductive elements 51 are included. Of course, the above FIG. 5 is only an example.

[0118] The number of inductance elements 51 can be even in the case that one inductance element 51 is connected between two adjacent radiation branches 121, and one inductance element 51 is connected between other radiation branches.

[0119] In the embodiment that two inductance elements 51 are connected between adjacent radiation branches 121 (the number of inductance elements 51 can be greater than the number of radiation branches 121 and less than N times the number of radiation branches 121), in a further implementation, the two inductance elements 51 connected in series can be arranged away from the feed point 24 between the feed structure 20 and the radiation structure 10. Specifically, the radiation branches 121 connected by the two inductance elements 51 in series can be radiation branches 121 away from the feed point 24, for example, can be radiation branches 121 not coupled with the feed point 24.

[0120] Exemplarily, please continue to combine Figure 5, the feed structure 20 includes a feed point 24, and the plurality of radiation branches 121 includes a first radiation branch 1211 connected with the feed point 24, and a plurality of second radiation branches 1212 other than the first radiation branch 1211; wherein the number of inductance elements 51 connected in series between the first radiation branch 1211 and the second radiation branch 1212 is less than the number of inductance elements 51 connected in series between each two adjacent second radiation branches 1212.

[0121] In the exemplary embodiment, the radiation branch 121 can be an L-shaped branch, and the plurality of radiation branches 121 includes a first radiation branch 1211 directly coupled with the feed point 24, and a plurality of second radiation branches 1212 other than the first radiation branch 1211, that is, the distance between the first radiation branch 1211 and the feed point 24 is less than the distance between the second radiation branch 1212 and the feed point 24, and the distance can be a planar distance, such as the minimum distance between the orthographic projection of the radiation branch 121 on the first dielectric substrate 11 and the orthographic projection of the feed point 24 on the first dielectric substrate 11.

[0122] The first radiation branch 1211 can be connected with two second radiation branches 1212, and the number of inductance elements 51 connected in series between the first radiation branch 1211 and the second radiation branch 1212 can be less than the number of inductance elements 51 connected in series between the second radiation branches 1212, so that the number of inductance elements 51 close to the feed point 24 is less than the number of inductance elements 51 away from the feed point 24, so that the inductance elements 51 loaded at the position of the radiation arm 12 close to the feed structure 20 are less, and the inductance elements 51 loaded at the position of the radiation arm 12 away from the feed structure 20 are more, so that by increasing the appropriate number of inductance elements 51 at the far end away from the feed point 24, the influence of the inductance elements 51 on the signals of the antenna radiation of other frequency bands can be further weakened, and the coupling between different frequency bands can be reduced.

[0123] For example, as shown in FIG. 5, one inductive element 51 can be connected in series between the first radiating branch 1211 and the second radiating branch 1212, and two inductive elements 51 can be connected in series between each two adjacent second radiating branches 1212. Alternatively, in some other examples, one inductive element 51 can be connected in series between the first radiating branch 1211 and the second radiating branch 1212, and three inductive elements 51 can be connected in series between each two adjacent second radiating branches 1212. Alternatively, in some other examples, two inductive elements 51 can be connected in series between the first radiating branch 1211 and the second radiating branch 1212, and three inductive elements 51 can be connected in series between each two adjacent second radiating branches 1212.

[0124] As described above, the orthographic projection of the filter structure 50 on the first dielectric substrate 11 can be located on each side of the annular polygon, that is, the filter structure 50 is arranged on each radiating side of the radiating arm 12, and in this embodiment, when the filter structure 50 includes the inductive elements 51 connected in series between the radiating branches 121, one or more inductive elements 51 can be arranged on each radiating side of the radiating arm 12. For example, as shown in FIGS. 3, 4 and 5, the orthographic projection of the plurality of inductive elements 51 on the first dielectric substrate 11 is located on different sides of the annular polygon.

[0125] In this example embodiment, the connection positions between the plurality of radiating branches 121 can be located on the sides of the annular polygon, for example, as shown in FIGS. 4-5, the L-shaped radiating branches 121 are sequentially connected end to end, so that the connection positions are located on the sides of the annular polygon formed. In this way, the inductive elements 51 loaded between each two radiating branches can be located on each side of the annular polygon, so that the inductive elements 51 are arranged around the radiating arm 12 to filter, thereby improving the filtering efficiency and reducing the coupling between different frequency bands.

[0126] In one implementation of this example embodiment, the positions of the inductive elements on the annular polygon can be located at positions where the induced current caused by the second frequency band is large, that is, the inductive elements are arranged at positions where the coupling current of the first frequency band signal and the second frequency band signal is largest, thereby eliminating the influence on the signal of the second frequency band.

[0127] In one implementation of this example embodiment, the orthographic projection of the inductive element 51 on the first dielectric substrate 11 can be located at the midpoint of the side of the annular polygon.

[0128] In this embodiment, whether the inductive element 51 connected between the radiating branches 121 is one or more, the inductive element 51 or the combination of inductive elements 51 is located at the midpoint of the side of the annular polygon.

[0129] Wherein, as shown in FIG. 3 and FIG. 4, in the case that each two adjacent radiation branches 121 are connected with the same number of inductive elements 51, such as one inductive element 51 or two inductive elements 51, the sizes of the plurality of radiation branches 121 can be consistent, which can refer to the branch length of the radiation branch 121, such as the radiation branch 121 is an L-shaped branch, the shapes and sizes of the L-shaped branches of different radiation branches 121 are consistent, and the branch lengths of the two small branch segments constituting the L-shaped branch of the radiation branch 121 can also be consistent, in this way, the connection between the radiation branches 121 is located at the midpoint of the ring polygon, thereby, the inductive elements 51 connected between the radiation branches 121 can also be located at the midpoint of the ring polygon.

[0130] Wherein, in the case that each two adjacent radiation branches 121 are connected with different number of inductive elements 51, such as the first radiation branch 1211 and the second radiation branch 1212 are connected with one inductive element 51, and the second radiation branch 1212 is connected with two inductive elements 51, the sizes of the plurality of radiation branches 121 can not be completely consistent, or can be completely consistent.

[0131] Specifically, as shown in FIG. 6 and FIG. 7, FIG. 6 and FIG. 7 show the planar structure diagrams of two other radiation structures 10.

[0132] Exemplarily, as shown in FIG. 6, the ring polygon has the same number of inductive elements 51 on two pairs of adjacent sides, and has different number of inductive elements 51 on the opposite two sides, such as the ring polygon includes a first side, a second side, a third side and a fourth side, wherein the first side and the third side are opposite, and the second side and the fourth side are opposite, one inductive element 51 is arranged on the first side and the second side, and two inductive elements 51 are arranged on the third side and the fourth side, in this case, the sizes of the plurality of radiation branches 121 are not completely consistent. As shown in FIG. 6, the length of L1 of the radiation branch 121 in the a area is different from the length of L1' of the radiation branch 121 in the b area, and the length of L2 of the radiation branch 121 in the a area is the same as the length of L2' of the radiation branch 121 in the b area; the length of L2' of the radiation branch 121 in the b area is different from the length of L2" of the radiation branch 121 in the c area, and the length of L1' of the radiation branch 121 in the b area is the same as the length of L1" of the radiation branch 121 in the c area. In this case, the inductive element 51 / inductive element 51 group is located at the midpoint of each side of the ring polygon.

[0133] As shown in FIG. 7, the number of inductors 51 on two pairs of adjacent sides of the loop polygon is different, while the number of inductors 51 on the opposite two sides of the loop polygon is the same. For example, the loop polygon includes a first side, a second side, a third side and a fourth side, the first side and the third side are opposite, and the second side and the fourth side are opposite. One inductor 51 is arranged on the first side and the third side, and two inductors 51 are arranged on the second side and the fourth side. In this case, the sizes of the plurality of radiation branches 121 can be completely the same. As shown in FIG. 7, the length of L1 of the radiation branch 121 in the a area is the same as the length of L1' of the radiation branch 121 in the b area, and the length of L2 of the radiation branch 121 in the a area is the same as the length of L2' of the radiation branch 121 in the b area. In this case, the inductor 51 / inductor 51 group is located at the midpoint of each side of the loop polygon, and the sizes of the radiation branches 121 can be the same.

[0134] In the present exemplary embodiment, when the inductor 51 is located at the midpoint of each side of the radiation arm 12 of the loop polygon, the influence of the antenna on the second frequency band can be further reduced, and the filtering performance of the antenna can be enhanced.

[0135] In the present embodiment, the inductor 51 can be a thin-film inductor or a wire-wound inductor. For the wire-wound inductor, it can be a spiral coil inductor or other types of wire-wound inductor.

[0136] In an exemplary embodiment, the inductor 51 includes a wire-wound inductor, and the radiation arm 12 is located on the first side of the first dielectric substrate 11, and the wire-wound inductor is located on the second side of the first dielectric substrate 11 opposite to the first side. The wire-wound inductor includes a first end and a second end, and the first end and the second end pass through the first dielectric substrate 11 and are connected to the adjacent two radiation branches 121.

[0137] As shown in FIG. 8 and FIG. 9, FIG. 8 shows a partial schematic view of the position where the inductor 51 and the radiation branch 121 are connected in series, and FIG. 9 shows a schematic view of the cross-sectional structure of the radiation structure 10. As shown in FIG. 8 and FIG. 9, the inductor 51 is a wire-wound inductor, the radiation branch 121 is located on the first side of the first dielectric substrate 11, and the wire-wound inductor includes a first end and a second end. Since the wire-wound inductor needs to form a coil, the first end and the second end can pass through the first dielectric substrate 11 and be connected to the radiation branch 121 on the first side. As shown in FIG. 9, the wire-wound inductor can be flush with the surface of the first dielectric substrate 11 on the second side of the first dielectric substrate 11.

[0138] In one exemplary embodiment of the present embodiment, as shown in (c) of FIG. 8, the wire-wound inductive element 51 can include a spiral coil inductor 513, a normal projection of which on the first dielectric substrate 11 can be circular, the normal plane being a plane perpendicular to the first dielectric substrate 11.

[0139] In yet another exemplary embodiment of the present embodiment, as shown in (a) of FIG. 8, the wire-wound inductive element 51 can include a rectangular spiral inductive element 511, a normal projection of which on the first dielectric substrate 11 can be a rectangular spiral, which can mean that the coil of the inductive element 51 has a plurality of rectangular bends (vertical bends) on the plane of the first dielectric substrate 11, the plurality of rectangular bends being arranged in a spiral shape, such as a paperclip arrangement, and using such an inductive element 51 can improve the filtering performance of the antenna.

[0140] In one exemplary embodiment, the inductive element 51 includes a thin-film inductor 512, and the radiating arm 12 can be located on the same side as the thin-film inductor 512, for example, the thin-film inductor and the radiating arm 12 can both be located on the same side of the first dielectric substrate 11.

[0141] Referring to (b) of FIG. 8, the thin-film inductor can be made using a vacuum thin-film process, which has the advantages of high reliability, easy integration, and chip-like, and when making the inductive element 51, an automatic surface mounting technology (SMT) can be used to mount the inductive element 51 to the first dielectric substrate 11 and form an electrical connection between the inductive element 51 and the radiating branch 121, and due to its small size, good high-frequency characteristics, and other advantages, it helps to reduce the loading difficulty of the filtering structure 50.

[0142] In yet another exemplary embodiment, the filtering structure 50 can include an open-circuit branch in addition to the inductive element 51, the open-circuit branch 52 can be connected to the radiating branch 121 and staggered with the inductive element 51. That is, the inductive element 51 is connected in series between the radiating branches 121, and the open-circuit branch 52 can be connected to the radiating branches 121, the open-circuit branch 52 can be understood as a parasitic branch of the radiating branch 121.

[0143] In the present exemplary embodiment, referring to FIGS. 10-12, FIGS. 10-12 show another structure of the radiating structure 10, as shown in FIGS. 10-12, the open-circuit branch 52 can be connected to at least one of the radiating branches 121. Exemplarily, as shown in FIG. 10, the open-circuit branch 52 can be connected to one of the radiating branches 121, and the radiating branch 121 to which the open-circuit branch is connected can be a radiating branch 121 away from the feed point 24.

[0144] Alternatively, the open-circuit stubs 52 can be connected on a plurality of the radiating stubs 121, in which case, the open-circuit stubs 52 can be connected on a part of the plurality of the radiating stubs 121, or the open-circuit stubs 52 can be connected on all of the radiating stubs 121. As shown in Fig. 11, the open-circuit stubs 52 can be connected on a part of the radiating stubs 121, such as on two radiating stubs 121 away from the feed point 24.

[0145] In the case where the open-circuit stubs 52 are connected on a part of the radiating stubs 121, the open-circuit stubs 52 are connected on adjacent two radiating stubs 121, that is, the open-circuit stubs 52 are connected on adjacent a plurality of the radiating stubs 121. Alternatively, as shown in Fig. 11, in the case where the open-circuit stubs 52 are connected on a part of the radiating stubs 121, the open-circuit stubs 52 can be spaced apart from each other by one or more of the radiating stubs 121. As shown in Fig. 11, the two open-circuit stubs 52 can be spaced apart from each other by one of the radiating stubs 121.

[0146] In the case where the open-circuit stubs 52 are connected on a part of the radiating stubs 121, the open-circuit stubs 52 are connected on adjacent two radiating stubs 121, that is, the open-circuit stubs 52 are connected on adjacent a plurality of the radiating stubs 121. Alternatively, as shown in Fig. 11, in the case where the open-circuit stubs 52 are connected on a part of the radiating stubs 121, the open-circuit stubs 52 can be spaced apart from each other by one or more of the radiating stubs 121. As shown in Fig. 11, the two open-circuit stubs 52 can be spaced apart from each other by one of the radiating stubs 121.

[0147] In the case where the open-circuit stubs 52 are connected on a part of the radiating stubs 121, the open-circuit stubs 52 are connected on adjacent two radiating stubs 121, that is, the open-circuit stubs 52 are connected on adjacent a plurality of the radiating stubs 121. Alternatively, as shown in Fig. 11, in the case where the open-circuit stubs 52 are connected on a part of the radiating stubs 121, the open-circuit stubs 52 can be spaced apart from each other by one or more of the radiating stubs 121. As shown in Fig. 11, the two open-circuit stubs 52 can be spaced apart from each other by one of the radiating stubs 121.

[0148] In the present exemplary embodiment, since the filter structure 50 further comprises the open-circuit stubs 52, the added open-circuit stubs 52 can enhance the filtering performance of the antenna, and further reduce the coupling between different frequency bands.

[0149] In the present exemplary embodiment, the filter structure 50 comprises both the open stub 52 and the inductive element 51, and the positions of the open stub 52 and the inductive element 51 can be staggered with each other, for example, the connection point between the open stub 52 and the radiating stub 121 is different from the connection point between the inductive element 51 and the radiating stub 121, and the two connection points are spaced apart from each other. In some exemplary embodiments, the first distance between the connection point of the open stub 52 and the end point of the radiating stub 121 is less than 1 / 2 of the second distance between the connection point of the inductive element 51 and the end point of the radiating stub 121. For example, the first distance can be 1 / 3, 1 / 4, 1 / 5 or 1 / 6 of the second distance, so that the open stub 52 can be closer to the end point of the loop polygon, and the inductive element 51 can be closer to the midpoint of the side of the loop polygon. Exemplarily, as shown in FIGS. 10-12, the inductive element 51 can be located at the midpoint of the side of the loop polygon, and the connection point of the open stub 52 and the radiating stub 121 can be close to the end point of the loop polygon. By using such a position arrangement, the antenna can achieve better filtering performance.

[0150] In the present exemplary embodiment, when one open stub 52 is included, the open stub 52 can be located on the side of the radiating arm 12 of the loop polygon away from the feed point 24, for example, as shown in FIG. 10, one open stub 52 is included, and the open stub 52 can be located on the side of the radiating arm 12 away from the feed point 24, for example, on the radiating stub 121 opposite to the radiating stub 121 connected to the feed point 24.

[0151] In the present exemplary embodiment, when multiple open stubs 52 are included, the open stubs 52 can be located on different sides of the radiating arm 12 of the loop polygon, for example, as shown in FIG. 11, two open stubs 52 are included, and the two open stubs 52 can be located on different sides of the radiating arm 12, respectively.

[0152] In the present exemplary embodiment, when multiple open stubs 52 are included, one radiating stub 121 can be connected to one open stub 52 or multiple open stubs 52, for example, part of the radiating stubs 121 are connected to one open stub 52, part of the radiating stubs 121 are connected to multiple open stubs 52, for example, two open stubs 52, and the remaining radiating stubs 121 are not connected to the open stub 52. For example, as shown in FIG. 12, the radiating stub 121 can be L-shaped, one radiating stub 121 connected to the feed point 24 can be connected to two open stubs 52, and the radiating stub 121 opposite to the radiating stub 121 can not be connected to the open stub 52, so that the two open stubs 52 can be arranged closer to the feed point 24.

[0153] In the example embodiment, the spacing between the plurality of open-circuit stubs 52 can be equal or unequal. In the equal case, each radiating stub 121 can be connected to one open-circuit stub 52; in the unequal case, some radiating stubs 121 can be connected to multiple open-circuit stubs 52 simultaneously, as shown in FIG. 12.

[0154] In the example embodiment, the open-circuit stubs 52 can extend towards the interior of the ring polygon, as shown in FIGS. 10 and 11, and the orthographic projection of the open-circuit stubs 52 on the first dielectric substrate 11 can be located within the space enclosed by the radiating arms 12 of the ring polygon.

[0155] In the example embodiment, the number of inductive elements 51 can be greater than or equal to the number of open-circuit stubs 52. For example, the number of open-circuit stubs 52 can be equal to the number of inductive elements 51. For example, four inductive elements 51 can be included, and four open-circuit stubs 52 can be included. For another example, six inductive elements 51 can be included, and six open-circuit stubs 52 can be included. Referring to FIG. 12, the number of inductive elements 51 can be equal to the number of open-circuit stubs 52. As shown in FIG. 12, four inductive elements 51 and four open-circuit stubs 52 can be included. In this case, the filter structure 50 includes inductive elements 51 and open-circuit stubs 52, and inductive elements 51 and open-circuit stubs 52 are arranged on each side of the ring polygon.

[0156] In the case where the number of open-circuit stubs 52 can be equal to the number of inductive elements 51, two open-circuit stubs 52 can be arranged close to the feed point 24. For example, as shown in FIG. 12, two open-circuit stubs 52 can be connected to one radiating stub 121 connected to the feed point 24, and one radiating stub 121 opposite to the radiating stub 121 can not be connected to an open-circuit stub 52. In this way, the two open-circuit stubs 52 can be arranged closer to the feed point 24. In this case, the spacing between the plurality of open-circuit stubs 52 can be unequal.

[0157] For another example, the number of open-circuit stubs 52 can be less than the number of inductive elements 51. For example, as shown in FIG. 11, four inductive elements 51 and two open-circuit stubs 52 can be included. In the case where the number of open-circuit stubs 52 is less than the number of inductive elements 51, the filtering performance of the antenna can be improved. In this case, the open-circuit stubs 52 can be connected to the radiating stubs 121 away from the feed point 24.

[0158] In the example shown in FIG. 11, the number of open-circuit stubs 52 is less than the number of inductive elements 51. In this way, the open-circuit stubs 52 can be connected to only some of the radiating stubs 121. In this case, the orthographic projection of the connected open-circuit stubs 52 on the first dielectric substrate 11 can be away from the orthographic projection of the feed point 24 on the first dielectric substrate 11.

[0159] In one embodiment of the present embodiment, the open stub 52 can be connected with the radiation stub 121 away from the feeding point 24. Exemplarily, please continue to combine FIG. 11, the plurality of radiation stubs 121 include two first radiation stubs 1211 connected with the feeding point 24, and a plurality of second radiation stubs 1212 other than the first radiation stubs 1211; wherein the open stub 52 is connected with the second radiation stub 1212.

[0160] In the present exemplary embodiment, the radiation stub 121 can be an L-shaped stub, and the plurality of radiation stubs 121 include first radiation stubs 1211 directly coupled with the feeding point 24, and a plurality of second radiation stubs 1212 other than the first radiation stubs 1211, that is, the minimum distance between the orthographic projection of the first radiation stub 1211 on the first dielectric substrate 11 and the orthographic projection of the feeding point 24 on the first dielectric substrate 11 is less than the minimum distance between the orthographic projection of the second radiation stub 1212 on the first dielectric substrate 11 and the orthographic projection of the feeding point 24 on the first dielectric substrate 11. As shown in FIG. 11, the first radiation stub 1211 and the three second radiation stubs 1212 are included, and two of the second radiation stubs 1212 are connected with the open stub 52, so that the two open stubs 52 are spaced apart by a radiation stub 121.

[0161] In one exemplary embodiment, the open stub 52 can be an L-shaped stub, so that the open stub 52 includes a first stub and a second stub, the orthographic projections of the first stub and the second stub on the dielectric substrate are connected in an L shape; wherein the first stub is connected with the radiation stub 121, and the second stub is parallel to the radiation stub 121, and the length of the first stub is less than the length of the second stub.

[0162] Wherein the open stub 52 is connected by the first stub and the second stub to form an L-shaped stub, the lengths of the first stub and the second stub are different, and among the two stubs, the stub with the smaller length is connected with the radiation stub 121, and the other stub with the larger length can be parallel to the radiation stub 121. For example, as shown in FIGS. 10-12, the length of the first stub is smaller, so the first stub is connected with the radiation stub 121, and specifically, the first stub can be connected perpendicularly with the radiation stub 121, and the second stub can be parallel to the radiation stub 121.

[0163] In combination with the above examples, the open stub 52 can be arranged near the end point of the loop polygon, in which case, the open stub 52 includes a first stub and a second stub with different lengths, and in the case that the stub with the smaller length is connected to the radiating stub 121, the extension directions of the stubs with the larger length in the plurality of open stubs 52 can not be the same. That is, the plurality of open stubs 52 are not oriented in the same direction in the counterclockwise or clockwise direction of the radiating arm 12. For example, as shown in FIG. 12, two open stubs 52 are connected to the first radiating stub 1211 near the feed point 24, the first stub with the smaller length in the two open stubs 52 is connected to the first radiating stub 1211, and the extension directions of the second stubs in the two open stubs 52 are orthogonal and extend in the direction away from the feed point 24.

[0164] In this embodiment, one radiating arm 12 can be loaded with an even number of open stubs 52.

[0165] In an exemplary embodiment, the single-polarized radiating body in the antenna can be configured as a loop-shaped electric dipole antenna element. Specifically, please continue to combine FIG. 1 and FIG. 2, in this example, the feed structure 20 includes the following structure:

[0166] The second dielectric substrate 21 is arranged orthogonally to the first dielectric substrate 11.

[0167] The balun 22 feed structure 20 is located on one side of the second dielectric substrate 21 and includes the balun 22 and the feed line 23.

[0168] The radiating arm 12 is coupled to the balun 22 feed structure 20 for feeding or directly contacts the balun 22 feed structure 20 for feeding.

[0169] In this exemplary embodiment, the two pairs of radiating arms 12 can be centrally symmetric about the second dielectric substrate 21, that is, the orthographic projection of the two pairs of radiating arms 12 on the first dielectric substrate 11 is located on opposite sides of the orthographic projection of the second dielectric substrate 21 on the first dielectric substrate 11. Exemplarily, as shown in FIG. 2, assuming that the first dielectric substrate 11 is rectangular, the two pairs of radiating arms 12 are located on the diagonal lines of the first dielectric substrate 11.

[0170] In this exemplary embodiment, the second dielectric substrate 21 is arranged orthogonally to the first dielectric substrate 11, as described above, the second dielectric substrate 21 and the first dielectric substrate 11 are made of the same material, for example, the second dielectric substrate 21 can be made of a material with a flame resistance rating of FR-4, for example, the material selected for the glass fiber epoxy feed substrate can also be different.

[0171] In the example embodiment, the balun 22 is used to convert the unbalanced feed line 23 into a balanced feed line 23, and the feed line 23 can be a coaxial feed line 23, which is responsible for transmitting electromagnetic signals into the radiating arm 12. By connecting the balun 22 and the feed line 23 with the radiating arm 12, the effective transmission of signals and the normal operation of the antenna can be ensured, which not only improves the efficiency of signal transmission, but also guarantees the stability and reliability of the antenna performance.

[0172] In the example embodiment, the radiating arm 12 is coupled to or directly contacted with the feed structure 20 of the balun 22, wherein the coupled feed can mean that the radiating arm 12 is not directly connected with the feed structure 22 of the balun, which can be fed through a gap or indirectly fed through other metal parts. The direct contact feed can mean that the radiating arm 12 is directly connected with the feed structure 22 of the balun.

[0173] The connection can mean an electrical connection.

[0174] For example, as shown in FIGS. 2-5, a direct feed mode is shown, in which the radiating arm 12 is directly fed with the feed structure 22 of the balun, and the two are in direct contact.

[0175] In a further implementation of the example embodiment, the radiating arm 12 can be coupled to the feed structure 20 of the balun 22, and specifically, it can be indirectly fed through other metal parts. Please refer to FIG. 13, which shows a planar structure schematic diagram of the radiating structure 10, as shown in FIG. 13, the single-polarized radiator further includes:

[0176] A coupling structure is arranged on the first dielectric substrate 11 and connected with the feed structure 20 of the balun 22, the coupling structure includes a first coupling member and a second coupling member arranged orthogonally, and the first coupling member and the second coupling member are both L-shaped in orthographic projection on the first dielectric substrate 11.

[0177] The two radiating branches 121 of one of the two radiating arms 12 are respectively connected at two ends of the first coupling member, and the two radiating branches 121 of the other radiating arm 12 are respectively connected at two ends of the second coupling member.

[0178] In the example embodiment, the coupling structure can include a pair of coupling members, which are made of metal materials, such as copper materials, each coupling member is L-shaped, and the two coupling members in the pair of coupling members are arranged orthogonally, for example, the orthographic projection of the first coupling member and the second coupling member on the first dielectric substrate 11 is L-shaped, and the two coupling members are arranged orthogonally, for example, as shown in FIG. 14, the first coupling member and the second coupling member are located on the diagonal line of the first dielectric substrate 11, and are orthogonal to each other.

[0179] In the example embodiment, one of the radiation branches 121 of one of the two radiation arms 12 is connected with the first coupling element, and one of the radiation branches 121 of the other radiation arm 12 is connected with the second coupling element. As shown in FIG. 14, the connection between the radiation branch and the coupling element can be in a stacked manner, for example, the radiation branch 121 and the coupling element can be located on opposite sides of the first dielectric substrate 11, and the orthographic projection of the radiation branch 121 on the first dielectric substrate 11 overlaps the orthographic projection of the coupling element on the first dielectric substrate 11. In this way, the orthographic projection of the radiation branch 121 of one of the two radiation arms 12 on the first dielectric substrate 11 overlaps the first coupling element, and the orthographic projection of the radiation branch 121 of the other radiation arm 12 on the first dielectric substrate 11 overlaps the second coupling element.

[0180] Here, the overlap can mean complete overlap or partial overlap.

[0181] Specifically, referring to FIG. 14, FIG. 14 shows a cross-sectional structure connection diagram between the radiation structure 10 and the feed structure 20. As shown in FIG. 14, the coupling element is connected with the balun 22 in the feed structure 20, the coupling element can be located on the side of the first dielectric substrate 11 away from the feed structure 20, and the radiation arm 12 can be located on the side of the first dielectric substrate 11 close to the feed structure 20, the orthographic projection of the coupling element on the first dielectric substrate 11 partially overlaps the orthographic projection of the radiation arm 12 on the first dielectric substrate 11, thereby realizing the coupling feed between the feed structure 20 and the radiation arm 12.

[0182] With this coupling feed method, the filtering performance of the antenna can be improved, and at the same time, the gain of the radiation signal of the antenna can be ensured.

[0183] In an example embodiment, the antenna can radiate dual-polarized signals, for example, radiate signals with two positive and negative 45° polarization directions. In this embodiment, the antenna can include two single-polarized radiators, and the radiation structures 10 in the two single-polarized radiators are orthogonal, and the feed structures 20 can also be orthogonal.

[0184] Referring to FIG. 15, FIG. 15 shows a top view structure diagram of a dual-polarized antenna. As shown in FIG. 15, the feed structures 20 of the two single-polarized radiators can be orthogonal, and the radiation structures 10 can also be orthogonal.

[0185] In the case that the single-polarized radiators are loop electric dipoles, one single-polarized radiator includes a pair of radiating arms 12, which can be symmetrically placed on the diagonal of the first dielectric substrate 11, and the pair of radiating arms 12 of each single-polarized radiator can be arranged in a cross shape on the first dielectric substrate 11. For example, as shown in (a), (b), (c) and (d) of FIG. 15, a pair of radiating arms 12 of one single-polarized radiator are arranged on the diagonal D1 of the first dielectric substrate 11, and a pair of radiating arms 12 of another single-polarized radiator are arranged on the diagonal D2 of the first dielectric substrate 11.

[0186] In the case that the single-polarized radiators are loop electric dipoles, one single-polarized radiator includes a pair of radiating arms 12, which can be symmetrically placed on the diagonal of the first dielectric substrate 11, and the pair of radiating arms 12 of each single-polarized radiator can be arranged in a cross shape on the first dielectric substrate 11. For example, as shown in (a), (b), (c) and (d) of FIG. 15, a pair of radiating arms 12 of one single-polarized radiator are arranged on the diagonal D1 of the first dielectric substrate 11, and a pair of radiating arms 12 of another single-polarized radiator are arranged on the diagonal D2 of the first dielectric substrate 11.

[0187] In an example embodiment, the opposite sides of the reflecting plate 30 can be bent towards the direction in which the radiating structure 10 is located, and the bending can be a 90° bending, so that the cross section of the reflecting plate 30 can be in a U shape.

[0188] In an example embodiment, an antenna device is provided, which can be a multi-frequency common-aperture antenna. Referring to FIGS. 16-18, FIG. 16 shows a perspective view of a first antenna in the antenna device, FIG. 17 shows a perspective view of a second antenna in the antenna device, and FIG. 18 shows a perspective view of the entire antenna device. As shown in FIGS. 16-18, the antenna device 300 can include the following structures:

[0189] a reflecting plate 30;

[0190] a plurality of antennas arranged on the reflecting plate 30, including at least one first antenna 100 and at least one second antenna 200, the highest frequency band of the working frequency band of the first antenna being smaller than the lowest frequency band of the working frequency band of the second antenna, and the first antenna and the second antenna being common-aperture;

[0191] In the case that the single-polarized radiators are loop electric dipoles, one single-polarized radiator includes a pair of radiating arms 12, which can be symmetrically placed on the diagonal of the first dielectric substrate 11, and the pair of radiating arms 12 of each single-polarized radiator can be arranged in a cross shape on the first dielectric substrate 11. For example, as shown in (a), (b), (c) and (d) of FIG. 15, a pair of radiating arms 12 of one single-polarized radiator are arranged on the diagonal D1 of the first dielectric substrate 11, and a pair of radiating arms 12 of another single-polarized radiator are arranged on the diagonal D2 of the first dielectric substrate 11.

[0192] As shown in FIG. 17, the reflecting plate 30 can be the reflecting plate 30 of the first antenna, and the normal projections of the plurality of antennas on the reflecting plate 30 are all located in the reflecting plate 30, so that the first antenna and the second antenna are common-aperture.

[0193] In the example embodiment, the reflecting plate 30 can be made of metal, such as copper, silver, aluminum, etc.

[0194] In the embodiment, the highest frequency band of the operating frequency band of the first antenna is less than the lowest frequency band of the operating frequency band of the second antenna, and thus the first antenna can radiate low-frequency signals and the second antenna can radiate high-frequency signals. For example, the second antenna can radiate signals in a frequency band of 1.6 GHz to 2.7 GHz. The frequency bands of signals radiated by different second antennas can or can not overlap. For example, different second antennas can respectively radiate high-frequency signals in different frequency bands.

[0195] In the embodiment, the first antenna has the structure of the antenna shown in any one of FIGS. 1 to 15, and thus the filter structure 50 is loaded on the radiating structure 10 of the first antenna, which can be used to reduce the influence on the high-frequency signals radiated by the second antenna. Thus, the area of the orthographic projection of the radiating structure 10 of the first antenna on the reflecting plate 30 can be greater than the area of the orthographic projection of the radiating structure 10 of the second antenna on the reflecting plate 30.

[0196] In the embodiment, the height of the first antenna on the reflecting plate 30 can be greater than the height of the second antenna on the reflecting plate 30, and the antenna device can include one first antenna and multiple second antennas, for example, four second antennas. As shown in FIG. 18, the orthographic projection of the radiating structure 10 of each single-polarized radiator of the first antenna on the reflecting plate 30 can overlap with the orthographic projection of the radiating patch of two second antennas on the reflecting plate 30. That is, the second antennas are arranged in an array on the reflecting plate 30, and each single-polarized radiator of the first antenna overlaps with two second antennas.

[0197] In the embodiment, the structure of the second antenna can refer to the structure of the first antenna. As shown in FIG. 17, the second antenna includes the feeding structure 20 and the radiating structure 10, and the feeding structure 20 is arranged orthogonally to the radiating structure 10. The feeding structure 20 can be a balun 22 feeding structure 20, and the radiating structure 10 can include a radiating patch or a radiating arm 12. The second antenna can radiate dual-polarized signals, or the second antenna can radiate single-polarized signals. For example, FIG. 17 shows a case where the second antenna includes a radiating patch. In this case, as shown in FIG. 18, the radiating arm 12 of the first antenna partially overlaps with the radiating patch of the second antenna.

[0198] In the embodiment, the structure of the second antenna is not limited to the structure shown in FIG. 18.

[0199] The antenna device in the embodiment includes the first antenna and the multiple second antennas, and the first antenna and the second antennas share the same aperture. Thus, multiple antennas can be installed in a limited space, and signals in multiple frequency bands can be radiated. In addition, the first antenna has the filter structure 50, which can reduce the influence of the first antenna on signals of the multiple second antennas, so that signal coupling between antennas in high-frequency bands and low-frequency bands is avoided, and thus the signal radiation performance of the multiple-frequency shared-aperture antenna is improved.

[0200] In an exemplary embodiment, the first metal baffle 31 is connected to the opposite side edges of the reflecting plate 30 and extends towards the direction where the antenna is located. The first metal baffle 31 can be made of metal material. Specifically, the first metal baffle 31 can be welded to the two sides of the reflecting plate 30, or the first metal baffle 31 can be connected to the two sides of the reflecting plate 30 by bolts or other connectors, or the first metal baffle 31 and the reflecting plate 30 can be integrally formed. In the integrally formed structure, the opposite sides of the reflecting plate 30 are bent by 90° towards the radiating structure 10, so that the cross section of the reflecting plate 30 can be U-shaped. By using such a reflecting plate 30, the radiation performance of the high frequency signal of the second antenna can be ensured, and specifically, the gain of the second antenna radiation signal can be improved, i.e. the high frequency radiation gain of the antenna device can be improved.

[0201] In an exemplary embodiment, the second antenna is located on the isolation plate 201, and the second metal baffle 202 is connected to the four peripheral edges of the isolation plate 201 and extends towards the direction where the second antenna is located. The second metal baffle 202 can be made of metal material. Specifically, the second metal baffle 202 can be welded to the four sides of the isolation plate 201, or the second metal baffle 202 can be connected to the four peripheral edges of the isolation plate 201 by bolts or other connectors, or the second metal baffle 202 and the isolation plate 201 can be integrally formed. In the integrally formed structure, the four peripheral edges of the isolation plate 201 are bent towards the direction where the second antenna is located. As shown in FIG. 17, the four peripheral edges of the isolation plate 201 are bent by 90° towards the direction where the second antenna is located. By using the isolation plate 201, the signal radiation of the multiple second antennas can be isolated, so that the signal crosstalk between the multiple second antennas can be avoided.

[0202] Next, the filtering effect of the first antenna in the antenna device of the present disclosure is compared and explained by combining several examples.

[0203] Example 1

[0204] The first antenna in Example 1 contains a filtering structure, which can be specifically referred to FIG. 15(a) and FIG. 16. The first antenna includes two single-polarized radiators, each of which is fed by a balun feeding structure. The two single-polarized radiators are orthogonal, and each single-polarized radiator adopts a loop-shaped electric dipole. The filtering structure includes four inductive elements and two open-circuit stubs. The four inductive elements are connected in series between each adjacent two radiating branches, and one inductive element is connected between each adjacent two radiating branches. The plurality of radiating branches include a first radiating branch connected to the balun feeding structure and a second radiating branch other than the first radiating branch. The open-circuit stubs are connected to two second radiating branches and are spaced apart by one radiating branch.

[0205] In the above example, the inductive element is a wire-wound inductive element, and the orthographic projection of the inductive element on the first dielectric substrate is a rectangular spiral.

[0206] In the above example, the cross section of the reflector plate is U-shaped, that is, the reflector plate includes a first metal baffle.

[0207] In the above example, the positional relationship between the plurality of second antennas and the first antenna can be referred to FIG. 19.

[0208] In Comparative Example 1, the first antenna in the antenna device does not contain a filtering structure, which is different from Example 1.

[0209] In Comparative Example 2, the first antenna in the antenna device does not contain a radiating arm, that is, only the second antenna radiates high-frequency signals in the antenna device, which is different from Comparative Example 1.

[0210] The antenna devices of Example 1, Comparative Example 1 and Comparative Example 2 are simulated respectively, and the simulation results can be referred to FIG. 19a and FIG. 19b. FIG. 19a shows the simulation comparison results of the mutual isolation between the high-frequency and low-frequency antennas of Example 1 and Comparative Example 1. As can be seen from the figure, compared with not adding a filtering structure to the low-frequency antenna, adding the filtering structure greatly improves the mutual isolation between the high-frequency and low-frequency antennas from -12 to -18 dB to -22 to -30 dB.

[0211] FIG. 19b shows the simulation comparison results of the mutual isolation between the high-frequency and low-frequency antennas. As can be seen from FIG. 19b, the low-frequency antenna element of Comparative Example 1 has a great influence on the high-frequency antenna pattern, and after adding the square loop-shaped inductive structure and the L-shaped open-circuit stub in Example 1, a good filtering effect is achieved, so that the high-frequency antenna pattern is restored to the case without the low-frequency antenna element (Comparative Example 2) at most frequency points, and the coupling between the high-frequency and low-frequency antennas is eliminated to a certain extent.

[0212] Example 2

[0213] The first antenna in this example 2 contains the filter structure, which is different from example 1 in that it contains 6 inductive elements. The positions of the 6 inductive elements can be referred to as shown in FIG. 5, i.e., the filter structure of each single-polarized radiator contains 6 inductive elements and 2 open-circuit stubs.

[0214] The antenna devices of example 2, comparative example 1 and comparative example 2 were simulated respectively, and the simulation results can be referred to as shown in FIG. 20a and FIG. 20b. FIG. 20a shows the simulation comparison results of the mutual isolation between the high-frequency and low-frequency antennas of example 2, comparative example 1 and comparative example 2. As can be seen from the figure, compared with not adding a filter structure to the low-frequency antenna, adding a filter structure greatly improves the mutual isolation between the high-frequency and low-frequency antennas from -12 to -18 dB to -22 to -60 dB. Moreover, compared with example 1, example 2 has better mutual isolation in the high-frequency band of 2.4-2.69 GHz.

[0215] As can be seen from FIG. 20b, at most frequency points, the high-frequency directional diagram of example 2 is similar to that of comparative example 2, while the high-frequency directional diagram of comparative example 1 is quite different from that of comparative example 2, indicating that adding a filter structure can reduce the crosstalk of the high-frequency signal radiated by the first antenna to the second antenna.

[0216] Example 3

[0217] The first antenna in this example 3 contains the filter structure, which is different from example 1 in that it contains 4 open-circuit stubs and 4 inductive elements. The position diagram of the 4 open-circuit stubs can be referred to as shown in FIG. 12.

[0218] The antenna devices of example 3, comparative example 1 and comparative example 2 were simulated respectively, and the simulation results can be referred to as shown in FIG. 21a and FIG. 21b. FIG. 21a shows the simulation comparison results of the mutual isolation between the high-frequency and low-frequency antennas of example 3, comparative example 1 and comparative example 2. As can be seen from the figure, compared with not adding a filter structure to the low-frequency antenna, adding a filter structure greatly improves the mutual isolation between the high-frequency and low-frequency antennas.

[0219] Example 4

[0220] The first antenna in this example 4 contains the filter structure, which is different from example 1 in that it contains 2 open-circuit stubs and 4 inductive elements. The inductive elements are 30nH thin-film inductors.

[0221] The antenna devices of Example 4, Comparative Example 1 and Comparative Example 2 are simulated respectively, and the simulation results can refer to Figure 22, Figure 22 shows the mutual isolation simulation comparison results between the high-frequency antenna and the low-frequency antenna of Example 4, Comparative Example 1 and Comparative Example 2. As can be seen from the figure, compared with not adding the filtering structure on the low-frequency antenna, the mutual isolation between the high-frequency antenna and the low-frequency antenna is greatly improved from -12 to -18 dB to -22 to -33 dB.

[0222] Example 5

[0223] The first antenna in this Example 5 contains a filtering structure, which is different from Example 1 in that it does not contain a coupling structure 60, and the radiating arm is directly in contact with the balun feeding structure for feeding.

[0224] The antenna devices of Example 5, Comparative Example 1 and Comparative Example 2 are simulated respectively, and the simulation results can refer to Figure 23, Figure 23 shows the mutual isolation simulation comparison results between the high-frequency antenna and the low-frequency antenna of Example 5, Comparative Example 1 and Comparative Example 2. As can be seen from the figure, compared with not adding the filtering structure on the low-frequency antenna, the mutual isolation between the high-frequency antenna and the low-frequency antenna is greatly improved from -12 to -18 dB to -22 to -36 dB, which is almost the same as Example 1.

[0225] Example 6

[0226] The first antenna in this Example 6 contains a filtering structure, which is different from Example 1 in that the reflector does not contain a first metal baffle, but is a flat plate structure.

[0227] The antenna devices of Example 6, Comparative Example 1 and Comparative Example 2 are simulated respectively, and the simulation results can refer to Figure 24, Figure 24 shows the mutual isolation simulation comparison results between the high-frequency antenna and the low-frequency antenna of Example 6, Comparative Example 1 and Comparative Example 2. As can be seen from the figure, compared with not adding the filtering structure on the low-frequency antenna, the mutual isolation between the high-frequency antenna and the low-frequency antenna is greatly improved from -12 to -18 dB to -22 to -30 dB, which is almost the same as the mutual isolation curve of Example 1.

[0228] Example 7

[0229] The first antenna in this Example 7 contains a filtering structure, which is different from Example 1 in that the filtering structure does not contain an open stub.

[0230] The antenna device of Example 7, Comparative Example 1 and Comparative Example 2 are simulated respectively, and the simulation results can be referred to Figure 25, Figure 25 shows the simulation comparison results of the mutual isolation between the high-frequency antenna and the low-frequency antenna of Example 7, Comparative Example 1 and Comparative Example 2. As can be seen from the figure, compared with not adding a filtering structure on the low-frequency antenna, adding a filtering structure greatly improves the mutual isolation between the high-frequency antenna and the low-frequency antenna, from -12 to -18 dB to -22 to -30 dB, which is comparable to the mutual isolation range of Example 1.

[0231] The above examples all show that increasing the filtering structure can greatly improve the mutual isolation between the high-frequency antenna and the low-frequency antenna.

[0232] In an embodiment, a communication base station is also included, which can include the antenna as described in Figures 1-17, or include the antenna device as shown in Figure 19, and in the case of including multiple antenna devices, the multiple antenna devices can be arranged in an array to form a multi-frequency common-aperture antenna array.

[0233] Each of the embodiments in the specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0234] Finally, it should be noted that in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, product or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, product or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, product or equipment including the element.

[0235] The above describes in detail an antenna, an antenna device and a communication base station provided by the present disclosure. The principles and implementation modes of the present disclosure are described by applying specific examples. The above description of the embodiments is only to help understand the method and core idea of the present disclosure; at the same time, for those skilled in the art, according to the idea of the present disclosure, the specific implementation mode and application range will be changed; in view of the above, the content of the specification should not be understood as a limitation of the present disclosure.

[0236] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0237] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

[0238] The terms "an embodiment," "embodiment," or "one or more embodiments" as used herein mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this disclosure. Furthermore, please note that the examples of the phrase "in one embodiment" do not necessarily all refer to the same embodiment.

[0239] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this disclosure may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0240] In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This disclosure can be implemented by means of hardware comprising a plurality of different elements and by means of a suitably programmed computer. In a unit claim enumerating a plurality of means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

[0241] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions loaded in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. An antenna, wherein, The antenna is configured to radiate signals of a first frequency band, and includes at least one single-polarized radiator, the single-polarized radiator including: a radiation structure including a first dielectric substrate and a radiation arm located on one side of the first dielectric substrate, the radiation arm including a plurality of radiation branches connected in sequence to form a ring shape; a feeding structure connected to the radiation structure and configured to feed electrical signals to the radiation structure; and a filtering structure loaded at least between adjacent radiation branches and configured to weaken the influence of the antenna on signals of a second frequency band, the second frequency band having no overlapping frequency band with the first frequency band. The plurality of radiation branches are connected in sequence to form a ring polygon, and a projection of the filtering structure on the first dielectric substrate is located on each side of the ring polygon.

2. The antenna of claim 1, wherein, The filtering structure includes at least one inductive element connected in series between adjacent two radiation branches.

3. The antenna according to claim 1 or 2, wherein, The filtering structure further includes an open-circuit branch connected to at least one of the radiation branches.

4. The antenna of claim 3, wherein, The number of inductive elements is greater than the number of open-circuit branches.

5. The antenna of claim 4, wherein, There are at least a plurality of inductive elements connected in series between a pair of adjacent radiation branches.

6. The antenna of claim 3, wherein, The plurality of radiation branches include a first radiation branch connected to the feeding structure and a plurality of second radiation branches other than the first radiation branch.

7. The antenna of claim 3, wherein, The number of inductive elements connected in series between the first radiation branch and the second radiation branch is less than the number of inductive elements connected in series between each pair of adjacent second radiation branches. The inductive element includes a wire-wound inductor, the radiation arm is located on a first side of the first dielectric substrate, and the wire-wound inductor is located on a second side of the first dielectric substrate opposite the first side.

8. The antenna of claim 3, wherein, The wire-wound inductor includes a first end and a second end, and the first end and the second end pass through the first dielectric substrate and are connected to adjacent two radiation branches. A projection of the inductive element on the first dielectric substrate has a rectangular spiral shape.

9. The antenna of claim 8, wherein, The inductive element includes a thin-film inductor, and the thin-film inductor is located on the same side of the first dielectric substrate as the radiation arm.

10. The antenna of claim 3, wherein, The radiation branch is L-shaped, a first distance from a connection point of the open-circuit branch to an end point of the radiation branch is less than 1 / 2 of a second distance from the end point of the radiation branch to the inductive element.

11. The antenna of claim 4, wherein, The open-circuit branch includes a first branch and a second branch, and a projection of the first branch and the second branch on the dielectric substrate is connected in an L shape.

12. The antenna of claim 4, wherein, The first branch is connected to the radiation branch, the second branch is parallel to the radiation branch, and a length of the first branch is less than a length of the second branch. The plurality of radiation branches include a first radiation branch connected to the feeding structure and a plurality of second radiation branches other than the first radiation branch.

13. The antenna according to claim 5, wherein, The open-circuit branch is connected to the second radiation branch. The antenna includes a pair of radiation arms, and the feeding structure includes:

14. The antenna according to claim 1, wherein, a second dielectric substrate arranged orthogonally to the first dielectric substrate, and the pair of radiation arms are symmetrically distributed about the second dielectric substrate; ​ A balun feeding structure is located on one side of the second dielectric substrate, and includes a balun and a feeding line; The radiation arms are coupled to the balun feeding structure for feeding or directly contacted to the balun feeding structure for feeding.

15. The antenna of claim 14, wherein, The single-polarized radiator further includes: A coupling structure is arranged on the first dielectric substrate and connected to the balun feeding structure, and the coupling structure includes a first coupling member and a second coupling member arranged orthogonally, and the first coupling member and the second coupling member are both L-shaped in the orthographic projection on the first dielectric substrate. The radiation branch of one of the pair of radiation arms overlaps the first coupling member in the orthographic projection on the first dielectric substrate, and the radiation branch of the other radiation arm overlaps the second coupling member in the orthographic projection on the first dielectric substrate.

16. The antenna according to claim 1, wherein, Two single-polarized radiators including positive and negative 45° are arranged orthogonally.

17. An antenna device, wherein, It includes: A reflecting plate; A plurality of antennas are arranged on the reflecting plate, including a first antenna and at least one second antenna, the highest frequency band of the operating frequency band of the first antenna is less than the lowest frequency band of the operating frequency band of the second antenna, and the first antenna and the second antenna share the same aperture; The first antenna adopts the antenna of any one of claims 1-17, and the orthographic projection of the first antenna and the second antenna on the reflecting plate overlaps.

18. The antenna device of claim 17, wherein, First metal baffles are connected to opposite sides of the reflecting plate, and the first metal baffles extend towards the direction where the antennas are located.

19. The antenna device of claim 17, wherein, It further includes: An isolation plate is located between the reflecting plate and the second antenna; A plurality of second metal baffles are respectively connected to the four peripheral edges of the isolation plate and extend towards the direction where the second antenna is located.

20. A communication base station, wherein, The communication base station includes a plurality of antenna devices as claimed in any one of claims 17-19, and the plurality of antenna devices are arranged in an array.

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