10, and the feeder 12 connected to the first radiation part 11 extends from the main substrate 101 to the side substrate 102, while the second substrate is disposed on a side of the side substrate 102, a portion of the feeder 12 on the side substrate 102 is connected to the first feed port 211 of the feed structure 21 on the second substrate through the first connection via 1021, where the first connection via 1021 is a hole running through the side substrate 102 and the second dielectric substrate 20 of the second substrate. Therefore, the alignment between the feeder 12 and the corresponding first feed port 211 is facilitated, precise connection is achieved, and the problem of the mis-connection can be avoided.

It should be noted that although FIG. 1 in the embodiments of the present disclosure only shows the example of four first radiation parts 11, the number of first radiation parts 11 may be set as required in an actual product. Since there are four first radiation parts 11, four feeders 12 are also provided in the corresponding feeder group, and also four first feed ports 211 are provided in each feed structure 21. That is, the feed structure 21 may be a one-to-four power divider.

Specifically, the one-to-four power divider may include a main path and four branches, where a first end of the main path is used as the second feed port 212, a second end of the main path is connected to first ends of the four branches, and second ends of the four branches are used as the first feed ports 211, respectively. In the embodiment of the present disclosure, line widths of the main path and the branches may be designed such that each of the four first feed ports 211 of the one-to-four power divider has an impedance of 50Q.

With continued reference to FIG. 1, in an embodiment of the present disclosure, taking the antenna being a dual-polarized antenna as an example, the antenna includes two feeder groups, i.e., a first feeder group and a second feeder group, and for convenience of description, the feeder 12 in the first feeder group is referred to as a first feeder 121, and the feeder 12 in the second feeder group is referred to as a second feeder 122. Accordingly, two corresponding feed structures 21 are provided, which are referred to as a first feed structure 21a and a second feed structure 21b, respectively, and each of the first feed structure 21a and the second feed structure 21b may be a one-to-four power divider. Specifically, FIG. 4 is a schematic diagram illustrating a connection of a feeder with a first feed port of a feed structure in an antenna according to an embodiment of the present disclosure. As shown in FIG. 4, one first feed port 211 of the first feed structure 21a is electrically connected to one first feeder 121, and one first feed port 211 of the second feed structure 21b is electrically connected to one second feeder 122. One first radiation part 11 is electrically connected to one first feeder 121 and one second feeder 122. For one first radiation part 11 and the first feeder 121 and second feeder 122 electrically connected thereto, a connection node between the first feeder 121 and the first radiation part 11 is a first node, and a connection node between the second feeder 122 and the first radiation part 11 is a second node. In this case, a connection line between the first node and the center of the first radiation part 11 is a first line segment, a connection line between the second node and the center of the first radiation part 11 is a second line segment, and an extending direction of the first line segment is intersected with an extending direction of the second line segment. For example: the extending direction of the first line segment is perpendicular to the extending direction of the second line segment, in which case the antenna can realize polarization directions of 0°/90°.

Further, with continued reference to FIG. 1, in addition to the above structures, the dual-polarized antenna in the embodiment of the present disclosure further includes a third substrate including a third dielectric substrate 30, and a second radiation part 31 on the third dielectric substrate 30. Specifically, the third dielectric substrate 30 includes a seventh surface M7 and an eighth surface M8 disposed opposite to each other. The second radiation part 31 may be disposed on the seventh surface M7, or on the eighth surface M8, and a certain spacing is provided between the seventh surface M7 of the third dielectric substrate 30 and the second surface M2 of the main substrate 101. Orthographic projections of one second radiation part 31 and one first radiation part 11 on a plane where the main substrate 101 is located are at least partially overlapped. The opposite first radiation part 11 and second radiation part 31 increase the radiation area of the radiating elements, thereby effectively improving the radiation efficiency.

The embodiment of the present disclosure only shows the example of the antenna being a dual-polarized antenna, and since a connection between the first feed structure 21a and the first feeder 121, and a connection between the first feeder 121 and the first radiation part 11, are the same as a connection between the second feed structure 21b and the second feeder 122, and a connection between the second feeder 122 and the first radiation part 11, respectively, and for convenience of description, the following description will be made by only taking the case where the first feed structure 21a is electrically connected to the first radiation part 11 through the first feeder 121 as an example.

In some examples, FIG. 7 is a partially enlarged view at position Q1 in FIG. 6; and FIG. 8 is a partial structural diagram of a sixth surface side of a second dielectric substrate in an antenna according to an embodiment of the present disclosure. As shown in FIGS. 5 to 8, the first reference electrode layer 13 in the first substrate includes a first reference sub-electrode and a second reference sub-electrode connected to each other, the first reference sub-electrode is disposed on the first surface M1 of the main substrate 101, and the second reference sub-electrode is disposed on the fourth surface M4 of the side substrate 102. In this case, the second reference sub-electrode and the second reference electrode layer 22 are bonded and electrically connected to each other. The antenna includes at least one first opening 221 and at least one radio frequency line 40. The number of first openings 221 and the number of radio frequency lines 40 both correspond to the number of feed structures 21, and since the antenna includes two feed structures 21, two first openings 221 and two radio frequency lines 40 are also provided.

Specifically, the two first openings 221 each run through the first reference sub-electrode and the second reference electrode layer 22, and are each provided with a first connection electrode 23. The first connection electrode 23 is disposed on the third surface M3 of the second dielectric substrate 20. For the first connection electrode 23 in one of the first openings 221, the second feed port of the first feed structure 21a is connected to the first connection electrode 23 through a second connection via 201 running through at least the second dielectric substrate 20, while the first connection electrode 23 is further connected to a core of one radio frequency line 40 through a third connection via 202 running through at least the second dielectric substrate 20. For the first connection electrode 23 in the other first opening 221, the second feed port of the second feed structure 21b is connected to the first connection electrode 23 through a second connection via 201 running through at least the second dielectric substrate 20, while the first connection electrode 23 is further connected to a core of the other radio frequency line 40 through a third connection via 202 running through at least the second dielectric substrate 20. In this manner, it is achieved that one radio frequency line 40 feeds the first feeder 121 through the first feed structure 21a, and the other radio frequency line 40 feeds the second feeder 122 through the second feed structure 21b.

Further, the antenna further includes two second connection electrodes 24 on the second dielectric substrate 20, and the two second connection electrodes 24 are each connected to the second reference electrode layer 22 through a fourth connection via running through the second dielectric substrate 20. The third connection via 202, electrically connecting the core of the radio frequency line 40 and the first connection electrode 23, runs through not only the second dielectric substrate 20 as described above, but also the second connection electrode 24. A reference electrode layer (e.g., ground layer) of the radio frequency line 40 is electrically connected to the second reference electrode layer 22 through the second connection electrode 24. A plurality of fourth connection vias electrically connecting each second connection electrode 24 and the second reference electrode layer 22 may be provided to ensure stable connection between the second reference electrode layer 22 and the second connection electrode 24.

Still further, with continued reference to FIG. 3, a second opening 1022 is formed in the side substrate 102 of the first dielectric substrate 10, and an orthographic projection of the second opening 1022 on a plane where the second dielectric substrate 20 is located covers an orthographic projection of the first opening 221 on the plane where the second dielectric substrate 20 is located. In this manner, the second opening 1022 in the side substrate 102 can facilitate connection between the first connection electrode 23 and the second feed port 212 of the feed structure 21. Particularly, when the feed port of the feed structure 21 is welded to the first connection electrode 23, the second opening 1022 formed at such a position of the side substrate 102 can prevent short circuit between the first connection electrode 23 and the first reference electrode layer 13. The second opening 1022 may be a U-shaped opening formed in the side substrate 102, and an orthographic projection of the U-shaped opening on the plane where the second dielectric substrate 20 is located covers orthographic projections of the two first openings 221 on the plane where the second dielectric substrate 20 is located. The second opening 1022 may alternatively be an annular opening. Apparently, the second opening 1022 may further include two sub-openings arranged in one-to-one correspondence with the two first openings 221. The sub-openings may be U-shaped or annular openings.

Specifically, the second connection via 201 runs through not only the second dielectric substrate 20, but also the first connection electrode 23, while the third connection via 202 runs through not only the second dielectric substrate 20, but also the first connection electrode 23. The first connection electrode 23 is welded to the second feed port 212 of the feed structure 21 through the second connection via 201, and the core of the radio frequency line 40 is welded to the first connection electrode 23 through the third connection via 202. In other words, the second feed port 212 of the feed structure 21 is connected to the first connection electrode 23 by welding, and the radio frequency line 40 is also connected to the first connection electrode 23 by welding, so that secure fixation and stable connection are implemented.

In some examples, with continued reference to FIG. 4, the first feed port 211 of the feed structure 21 is connected to the feeder 12 by a rivet 60 running through the first connection via 1021. In other words, the first connection via 1021 will run through the first feed port 211 and the feeder 12, and then the rivet 60 is inserted into the first connection via 1021 to connect the first feed port 211 and the feeder 12. Specifically, the first feed port 211 of the first feed structure 21a is connected to the first feeder 121 by a rivet 60 running through a first connection via 1021, and the first feed port 211 of the second feed structure 21b is connected to the second feeder 122 by a rivet 60 running through a first connection via 1021.

In some examples, the first feed port 211 of the feed structure 21 is connected to the feeder 12 by welding together through the first connection via 1021. Specifically, the first feed port 211 of the first feed structure 21a is welded to the first feeder 121 through a first connection via 1021, and the first feed port 211 of the second feed structure 21b is welded to the second feeder 122 through a first connection via 1021.

In some examples, FIG. 9a is a schematic diagram showing a positional relationship between a first radiation part and a director in an antenna according to an embodiment of the present disclosure. As shown in FIG. 9a, the antenna further includes at least one director 13 on the second surface M2 of the main substrate 101 and in one-to-one correspondence with the first radiation part 11. The director 13 is located on a side of the first radiation part 11 away from the side substrate 102. Since four first radiation parts 11 are provided in FIG. 1, also four directors 13 are provided. Each director 13 is configured to change current distribution at an edge of the corresponding first radiation part 11, so that the current is restrained and further regularized, and thereby isolation of the antenna is improved. FIG. 10 is an isolation plot of an antenna with and without a director according to an embodiment of the present disclosure. As shown in FIG. 10, S1 is an isolation curve of an antenna with a director 13, while S2 is an isolation curve of an antenna without any director 13. It can be seen that the isolation of the antenna is significantly improved by introducing the director 13.

Further, FIG. 9a only shows an exemplary structure of the director 13, including a first sub-electrode and a second sub-electrode, where the first sub-electrode is located on a side of the first radiation part 11 away from a side substrate, and the second sub-electrode is connected to a side of the first sub-electrode away from the first radiation part 11. It should be understood that the director 13 is not limited to the structure shown in FIG. 9a, and other structures of the director 13 is also possible.

In some examples, in addition to the above structures, the antenna further includes a radome 50, and the first substrate, the second substrate, and the third substrate of the antenna are all located within an accommodation space defined by the radome 50. The first substrate and the third substrate are disposed on upper and lower surfaces of the radome 50, and bonded to the upper and lower surfaces of the radome 50, respectively, by an optical clear adhesive (OCA), for example. Specifically, the radome 50 includes a first base material and a second base material disposed opposite to each other, the first dielectric substrate 10 with the first reference electrode layer 13 is disposed on a side of the first base material close to the second base material, and the third dielectric substrate 30 with the second radiation part 31 is disposed on a side of the second base material close to the first base material.

Further, the radome 50 may be made of a material including plastic, such as: polycarbonate (PC), copolymers of cycloolefin (COP), or acrylic/polymethyl methacrylate (PMMA).

In some examples, FIG. 11 is a schematic diagram showing a fixation manner of a first dielectric substrate and a third dielectric substrate in an antenna according to an embodiment of the present disclosure; and FIG. 12 is a partially enlarged view at position Q2 in FIG. 11. As shown in FIGS. 11 and 12, a plurality of sets of slide rails 501 are provided on two opposite side walls of the radome 50, and the main substrate 101 and the third dielectric substrate 30 are insertable into different sets of slide rails 501, so that a certain spacing is provided between the main substrate 101 and the third dielectric substrate 30. In this case, the slide rails 501 on the side walls of the radome 50 can be used as supports for the main substrate 101 and the third dielectric substrate 30. Apparently, where three or more sets of slide rails 501 are provided, a distance between the main substrate 101 and the first dielectric substrate 10 can be adjusted by selecting different sets of slide rails 501 to support the main substrate 101 and the third dielectric substrate 30, so that a relative distance between the first substrate and the third substrate in the antenna is adjustable, and thus one set of antennas can be shared by multiple bands.

In some examples, FIG. 13 is a schematic diagram showing another fixation manner of a first dielectric substrate and a third dielectric substrate in an antenna according to an embodiment of the present disclosure. As shown in FIG. 13, the adjustment of the distance between the first substrate and the third substrate can also be implemented by supporting the main substrate 101 of the first dielectric substrate 10 and the third dielectric substrate 30 with support components. Each support component may be a height-adjustable support component to adjust the spacing between the first substrate and the third substrate, that is, adjust a spacing between the first radiation part 11 and the second radiation part 31. For example: the support components are rotating screws. Apparently, FIG. 14 is a schematic diagram showing yet another fixation manner of a first dielectric substrate and a third dielectric substrate in an antenna according to an embodiment of the present disclosure. As shown in FIG. 14, the support components may include multiple groups of support components of different heights, and the distance between the first substrate and the third substrate is maintained by selecting different groups of support components.

Further, the support components may be provided at four corners of the main substrate 101, thereby providing stable support for the first substrate and the third substrate.

In some examples, the first radiation parts 11 and the second radiation parts 31 are arranged in one-to-one correspondence, and have the same pattern. For example: the first radiation part 11 and the second radiation part 31 each have a circular or polygonal shape or the like. In one example, the first radiation part 11 and the second radiation part 31 each have a centrosymmetric pattern, and orthographic projections of centers of the first radiation part 11 and the second radiation part 31 on the first surface M1 of the main substrate 101 coincide.

Further, referring to FIG. 9a, a protrusion is connected to the first radiation part 11, forms an integral structure with the first radiation part 11, and functions to improve a cross-polarization ratio of the antenna. Two protrusions may be provided and connected to the first radiation part 11, and disposed opposite to each other. For one first radiation part 11 and the first feeder 121, the second feeder 122 and the two protrusions electrically connected to the first radiation part 11, a connection node between the first feeder 121 and the first radiation part 11 is a first node, a connection node between the second feeder 122 and the first radiation part 11 is a second node, the first node and the second node divide an outline of the first radiation part 11 into a first portion and a second portion, one of the two protrusions is connected to the first portion, and the other is connected to the second portion. Specifically, one of the protrusions is connected to a center of the first portion, and the other is connected to a center of the second portion.

FIG. 9b is a top view of a second radiation part in an antenna according to an embodiment of the present disclosure. As shown in FIG. 9b, a protrusion is connected to the second radiation part 31, forms an integral structure with the second radiation part 31, and functions to improve a cross-polarization ratio of the antenna. Two protrusions may be provided and connected to the second radiation part 31, and disposed opposite to each other. The protrusions connected to the second radiation part 31 may correspond to the protrusions connected to the first radiation part 11. Apparently, where the protrusions are connected to the second radiation part 31, the protrusions connected to the first radiation part