CN117748163A - Feed network component and array antenna - Google Patents

Abstract

The application relates to a feed network component and an array antenna. On one hand, the feed network is electrically connected with at least one coupler, so that the coupling degree can be improved, and the effect of improving the performance of the antenna is achieved; on the other hand, the top surface of the first dielectric layer is provided with a first grounding layer, the bottom surface of the first dielectric layer is provided with a second grounding layer so as to form a strip line structure for clamping the coupler between the first grounding layer and the second grounding layer, the coupler is arranged between the first grounding layer and the second grounding layer and is not easy to be impacted by the outside and electromagnetic interference, and particularly, the radiation influence from a radiation unit can be reduced, so that the coupler is coupled by a purer and more linear line, the more stable coupling performance is ensured, the good anti-interference effect is realized, the stability of coupling parameters is improved, and the subsequent application of the parameters is facilitated.

Description

Feed network component and array antenna

Technical Field

The present disclosure relates to the field of antenna technologies, and in particular, to a feed network assembly and an array antenna.

Background

In recent years, with the rapid development of communication technology, array antennas have been increasingly used. The strong-coupling array antenna not only can improve the coupling efficiency between the antenna subarrays and optimize the receiving and transmitting effects of signals, but also can utilize the coupling parameters between the arrays for calibrating the communication equipment. In the array antenna in the related art, strong coupling is realized by adjusting the distance between the power division networks, however, the structural design of the feed network is complex, and the antenna manufacturer can face the problems that the internal structure is easy to be disturbed, the system loss is high, signal interference is easy to exist and the like when the array antenna is designed.

Disclosure of Invention

Based on this, it is necessary to overcome the defects in the prior art, and to provide a feed network component and an array antenna, which can improve the coupling degree and enhance the anti-interference performance.

A feed network assembly, comprising:

the feed network circuit comprises a first feed network, a second feed network and a coupler, wherein the coupler is used for realizing the coupling between the first feed network and the second feed network;

the device comprises a first grounding layer, a first dielectric layer, a second dielectric layer and a second grounding layer, wherein the first grounding layer, the first dielectric layer, the coupler, the second dielectric layer and the second grounding layer are sequentially stacked from top to bottom to form a strip line structure for clamping the coupler between the first grounding layer and the second grounding layer.

In one embodiment, the first and second feed networks are disposed at different layers than the coupler; or the first feed network, the second feed network and the coupler are arranged on the same layer.

In one embodiment, the first feeding network and the second feeding network are disposed on the same layer as the first ground layer and cooperate to form a coplanar waveguide structure.

In one embodiment, the feeding network assembly further includes a third ground layer, the third ground layer is disposed on the same layer as the coupler, the third ground layer is electrically connected to the first ground layer, and the third ground layer is further electrically connected to the second ground layer.

In one embodiment, the third ground layer cooperates with the coupler to form a coplanar waveguide structure.

In one embodiment, the first dielectric layer is provided with a first metallized via, and the first ground layer is electrically connected with the third ground layer through the first metallized via.

In one embodiment, the third ground layer is soldered or connected to the second ground layer by a conductive connection.

In one embodiment, the feeding network assembly further comprises an insulating spacer connected between the third ground plane and the second ground plane, the third ground plane being coupled to the second ground plane.

In one embodiment, the first dielectric layer is a dielectric substrate, and the feed network circuit, the first ground layer, the dielectric substrate and the third ground layer are all PCB circuit boards.

In one embodiment, the second ground layer is provided as a reflective plate.

In one embodiment, the reflecting plate is provided with a groove corresponding to the coupler, an air cavity is formed between the coupler and the reflecting plate through the groove, and the second medium layer is the air cavity.

In one embodiment, the plurality of couplers are provided, the plurality of grooves are provided, and each coupler is arranged corresponding to each groove.

In one embodiment, the coupler includes two feeding members, and the two feeding members are connected to the first feeding network and the second feeding network respectively.

In one embodiment, the feed network circuit includes a plurality of power division networks arranged in one-to-one correspondence with each polarization of the plurality of columns of radiation units; each row of the radiating units corresponds to two power division networks with different polarizations, and each power division network comprises a main path and a branch path;

for two power division networks of the same column of the radiating units, the coupler is used for realizing the coupling between the branches of the two power division networks, and the corresponding branches of the two power division networks are respectively the first feed network and the second feed network;

for two power division networks of the radiation units in adjacent columns, the coupler is used for realizing the coupling between the main paths of the two power division networks, and the corresponding main paths of the two power division networks are respectively the first feed network and the second feed network;

the number of the couplers is multiple, and the couplers can be selectively arranged on the branch circuit and/or the main circuit.

An array antenna comprising the feed network assembly.

In one embodiment, the array antenna further comprises a plurality of radiating elements; the radiation units form a plurality of rows and are electrically connected with the feed network circuit.

On the one hand, the feed network is electrically connected with at least one coupler, so that the coupling degree can be improved, and the effect of improving the performance of the antenna is achieved; on the other hand, the top surface of the dielectric substrate is provided with a first grounding layer, the bottom surface of the dielectric substrate is provided with a second grounding layer so as to form a strip line structure for clamping the coupler between the first grounding layer and the second grounding layer, the coupler is arranged between the first grounding layer and the second grounding layer and is not easy to be impacted by the outside and electromagnetic interference, and particularly, the radiation influence from the radiation unit can be reduced, so that the coupler is coupled by a purer and more linear line, the more stable coupling performance is ensured, the good anti-interference effect is realized, the stability of the coupling parameter is improved, and the subsequent application of the parameter is facilitated.

Drawings

Fig. 1 is an exploded view of an array antenna according to an embodiment of the present application.

Fig. 2 is an exploded view of the feed network assembly of the structure of fig. 1.

Fig. 3 is a top view of the first ground layer and the feeding network in the structure shown in fig. 2.

Fig. 4 is a top view of the third ground layer and coupler in the structure of fig. 2.

Fig. 5 is a view of a structure diagram of a second ground layer in the structure shown in fig. 2.

Fig. 6 is a block diagram of the feed network and coupler of the structure of fig. 2 when combined.

10. A feed network component; 11. a dielectric substrate; 12. a feed network circuit; 121. a power division network; 1211. a main road; 1212. a branch; 1213. a first notch; 1214. a second notch; 13. a first ground layer; 14. a coupler; 141. a power feeding member; 1401. a first coupler; 1402. a second coupler; 15. a second ground layer; 151. a groove; 16. a third ground layer; 20. a radiation unit; 30. a partition wall; 40. an antenna housing.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

It should be noted that, the array antenna in the present embodiment includes, but is not limited to, a rectangular array with m rows and n columns, where m is a natural number greater than or equal to 2, and n is a natural number greater than or equal to 1, for example. Specifically, the drawings of the present embodiment are specifically developed with m being 4 and n being 3 as specific examples, but the present invention is not limited thereto. In addition, each array element of the rectangular array corresponds to one radiating element, and when the rectangular array is 4X3, the arrangement mode of the radiating elements is correspondingly 4X3, namely 12 radiating elements in total.

Referring to fig. 1, 2 and 5, fig. 1 shows an exploded structure of an array antenna according to an embodiment of the present application. Fig. 2 shows an exploded structural view of the feed network circuit assembly 10 in the structure shown in fig. 1. Fig. 5 shows a view of the structure of the second ground layer 15 in the structure shown in fig. 2. An embodiment of the present application provides a feeding network circuit assembly 10, where the feeding network circuit assembly 10 includes: the first dielectric layer 11, the second dielectric layer, the feed network circuit 12, the first ground layer 13, the at least one coupler 14 and the second ground layer 15. The feed network circuit 12 includes a first feed network and a second feed network. The coupler 14 is used to achieve coupling between the first feed network and the second feed network.

In addition, the first ground layer 13, the first dielectric layer 11, the coupler 14, the second dielectric layer, and the second ground layer 15 are stacked in this order from top to bottom to form a strip line structure in which the coupler is sandwiched between the first ground layer 13 and the second ground layer 15. Optionally, the second dielectric layer may be an air dielectric or a dielectric material, which may be specifically selected and set according to actual requirements.

Specifically, the feeding network circuit 12 cooperates with the first ground layer 13 to form a coplanar waveguide structure.

The first feed network, the second feed network and the coupler may be disposed in different layers or may be disposed in the same layer. When the first and second feeding networks are provided at different layers from the coupler, the first and second feeding networks may be provided at the same layer as the first ground layer 13.

In some embodiments, the first feeding network and the second feeding network are disposed on top of the first dielectric layer 11. Specifically, the first feeding network, the second feeding network and the first grounding layer 13 are all disposed on the top layer of the first dielectric layer 11, and cooperate to form a coplanar waveguide structure.

When the first and second feed networks are disposed at the same layer as the coupler, in some embodiments, the first feed network, the second feed network, and the coupler 14 are disposed at an intermediate layer of the first dielectric layer 11. Thus, the anti-interference effect is better.

Further, optionally, the coupler 14 comprises two feeding members 141 coupled to each other. Each feeding element 141 is electrically connected to the first feeding network and the second feeding network. The feeding member 141 includes, but is not limited to, a feeding line, a feeding sheet, etc., and may be flexibly adjusted and set to various shapes according to actual needs.

In some embodiments, the second ground layer 15 includes, but is not limited to, a reflective plate, and the second ground layer 15 is provided with a groove 151 corresponding to the position of the coupler 14. An air cavity is formed between the coupler 14 and the reflecting plate through the groove 151, and the second dielectric layer is specifically an air cavity. Specifically, the plurality of couplers 14 and the plurality of grooves 151 are provided, and each coupler 14 is disposed at a notch of each groove 151 and is insulated from the second ground layer 15 by the notch.

Specifically, the notch of the groove 151 is completely covered outside the corresponding coupler 14, that is, the notch opening wall of the groove 151 is not in electrical contact with the coupler 14, so that the coupler 14 is suspended in the groove 151, thereby realizing the mutual insulation and isolation between the second ground layer 15 and the coupler 14.

In the feeding network assembly 10, on the one hand, the feeding network circuit 12 is electrically connected with at least one coupler 14, and the coupler 14 has two feeding elements 141 coupled to each other, so that the coupling degree can be improved, and the effect of improving the antenna performance is achieved; on the other hand, the top surface of the first dielectric layer 11 is provided with the first grounding layer 13, the bottom surface of the first dielectric layer 11 is provided with the second grounding layer 15, so that a strip line structure in which the coupler 14 is clamped between the first grounding layer 13 and the second grounding layer 15 is formed, the coupler 14 is arranged between the first grounding layer 13 and the second grounding layer 15, the external impact and electromagnetic interference are not easy to happen, and particularly, the radiation influence from the radiation unit 20 can be reduced, so that the coupler 14 is coupled in a purer and more linear line, the more stable coupling performance is ensured, the good anti-interference effect is achieved, the stability of the coupling parameter is improved, and the subsequent application of the parameter is facilitated. In addition, the second ground layer 15 is provided with grooves 151 corresponding to the positions of the couplers 14, each coupler 14 is correspondingly arranged at the notch of each groove 151 and is insulated from the second ground layer 15 through the notch, the grooves 151 can prevent the second ground layer 15 from being electrically connected with the couplers 14, and meanwhile, compared with a dielectric material, the dielectric constant of air is smaller, so that loss can be reduced advantageously.

It should be noted that, in the present embodiment, the sequential stacking of the plurality of elements in the sequential stacking arrangement does not strictly define that two adjacent elements must be directly stacked, but may also be indirectly stacked, that is, an intermediate member may be disposed between two adjacent elements according to actual needs.

Referring to fig. 2 to 4, fig. 3 is a top view of the first ground layer 13 and the feeding network circuit 12 in the structure shown in fig. 2. Fig. 4 shows a top view of the third ground layer 16 and coupler 14 in the configuration shown in fig. 2. In one embodiment, the feed network assembly 10 further includes a third ground plane 16. The third ground layer 16 is disposed on the same layer as the coupler 14, and is connected to the bottom surface of the dielectric substrate 11. In addition, the third ground layer 16 is electrically connected to the first ground layer 13, and the third ground layer 16 is also electrically connected to the second ground layer 15. Therefore, the first ground layer 13, the third ground layer 16 and the second ground layer 15 are commonly grounded, so that the coupler 14 has quite stable performance and very good shielding effect, and the anti-interference characteristic is improved. In addition, the third ground layer 16 serves as an intermediate layer, which can facilitate the electrical connection between the first ground layer 13 and the second ground layer 15.

Of course, as some alternatives, the third ground layer 16 may be omitted, and the common ground connection of the first ground layer 13 and the second ground layer 15 may be achieved by penetrating the first dielectric layer 11 with at least one conductive connection, for example.

Referring to fig. 2-4, in one embodiment, the third ground layer 16 cooperates with the coupler 14 to form a coplanar waveguide structure. In this way, the shielding performance of the coupler 14 can be improved, and the interference immunity can be enhanced.

Referring to fig. 2 to 4, in one embodiment, at least one first metallization via is disposed on the first dielectric layer 11. The first ground layer 13 and the third ground layer 16 are electrically connected through the first metallized via hole. As such, the first ground layer 13 is commonly connected to both the third ground layer 16 through the first metallized via.

In some embodiments, the first dielectric layer 11 may further be provided with conductive fasteners such as metal screws, metal pins, metal rivets, etc. to achieve the conductive connection between the first ground layer 13 and the third ground layer 16.

In some embodiments, at least one second metallized via is provided on the first dielectric layer 11. The second metallized via is electrically connected to the feeding network circuit 12 and the coupler 14, respectively. In this way, the feeding network circuit 12 is electrically connected to both the coupler 14 through the second metallized via.

In some embodiments, the first dielectric layer 11 may further be provided with conductive fasteners such as metal screws, metal pins, metal rivets, etc. to achieve the conductive connection between the feeding network circuit 12 and the coupler 14.

Referring to fig. 2, 4 and 5, in one embodiment, the third ground layer 16 is soldered or connected to the second ground layer 15 by at least one conductive connection. Wherein the conductive connection member includes, but is not limited to, a metal screw, a metal pin, a metal rivet, etc.

Referring to fig. 2, 4 and 5, in one embodiment, the feeding network assembly 10 further includes an insulating spacer connected between the third ground layer 16 and the second ground layer 15. Wherein the insulating spacer includes, but is not limited to, a dielectric film. The third ground layer 16 is coupled to the second ground layer 15. In this way, the third ground layer 16 is connected to the second ground layer 15 by coupling, so that the third ground layer 16 is commonly connected to the second ground layer 15.

Referring to fig. 2, in one embodiment, the first dielectric layer 11 is a dielectric substrate, and the feeding network circuit, the first ground layer 13, the first dielectric layer 11 and the third ground layer 16 form a PCB. In this way, the first ground layer 13 and the third ground layer 16 are respectively disposed on two opposite sides of the first dielectric layer 11 by adopting the circuit board manufacturing process, so that mass production can be realized.

Referring to fig. 1, 3, 4 and 6, fig. 6 is a block diagram illustrating the combination of the feeding network circuit 12 and the coupler 14 in the structure shown in fig. 2. In one embodiment, the feed network circuit 12 includes a plurality of power splitting networks disposed in one-to-one correspondence with each polarization of the plurality of columns of radiating elements 20. Each row of radiating elements corresponds to two differently polarized power division networks 121, each comprising a main path 1211 and a branch path 1212;

for two power division networks 121 of the same column of radiating elements, the coupler 14 is configured to implement coupling between branches 1212 of the two power division networks 121, where corresponding branches 1212 of the two power division networks 121 are the first feed network and the second feed network respectively; that is, in this case, the coupler 14 is used to achieve coupling between the differently polarized power splitting networks 121 of the same column of radiating elements, and coupling is achieved at the legs 1212 of the two differently polarized power splitting networks 121.

For two power division networks 121 of adjacent columns of radiating elements, the coupler 14 is configured to implement coupling between the main paths 1211 of the two power division networks 121, where the corresponding main paths 1211 of the two power division networks 121 are the first feed network and the second feed network respectively; that is, in this case, the coupler 14 is used to achieve coupling between the differently polarized power splitting networks 121 of adjacent columns of radiating elements, and coupling is achieved in the main path 1211 of the two differently polarized power splitting networks 121.

In particular, in the present embodiment, there may be a plurality of couplers 14, and a plurality of couplers 14 may be selectively disposed in the branch 1212 and/or the main 1211.

In this embodiment, two power division networks 121 with different polarizations are shown as a dashed box and a solid box in fig. 6, respectively. When the power division network 121 indicated by the dashed box is positively polarized, the power division network 121 indicated by the solid box is negatively polarized; conversely, when the power division network 121 indicated by the dashed box is negatively polarized, the power division network 121 indicated by the solid box is positively polarized. Wherein, as seen in the left-to-right direction in fig. 6, the first dashed box and the first solid box respectively correspond to two differently polarized power division networks 121 of the first column of radiation units; similarly, two differently polarized power splitting networks 121 of radiating elements of each column are arranged adjacent, and differently polarized power splitting networks 121 of radiating elements of adjacent columns are arranged adjacent.

In this embodiment, referring to fig. 6, the plurality of couplers 14 includes at least one first coupler 1401 and/or at least one second coupler 1402. The first feeding network and the second feeding network correspondingly coupled to the first coupler 1401 are respectively set as the main paths 1211 of the two adjacent power division networks 121. Specifically, the two power feeds 141 of the first coupler 1401 are respectively disposed on the main paths 1211 of the adjacent two power division networks 121 (specifically, the two adjacent power division networks 121 of different polarizations of the adjacent two columns of radiation elements). Specifically, the main path 1211 of the power distribution network 121 is provided with a first notch 1213, and the feeding member 141 of the first coupler 1401 is connected in series to the first notch 1213, that is, the first coupler 1401 is a part of the main path 1211 of the power distribution network 121. In addition, the first feeding network and the second feeding network correspondingly coupled to the second coupler 1402 are respectively set as branches 1212 of two power division networks 121 (specifically, two power division networks 121 of two different polarizations of the same column of radiating elements). Specifically, the two feeding elements 141 of the second coupler 1402 are respectively disposed on the two branches 1212 of the two power division networks 121. Specifically, the branch 1212 of the power division network 121 is provided with a second notch 1214, and the feeding element 141 of the second coupler 1402 is connected in series in the second notch 1214, that is, the second coupler 1402 is part of the branch 1212 of the power division network 121.

As can be seen, the main paths 1211 of the two differently polarized power splitting networks 121 of the adjacent two columns of the radiating elements 20 are coupled to each other, so that the coupling energy of the adjacent two columns of the radiating elements 20 can be enhanced; the branches 1212 of the two different polarization power division networks 121 of the radiating elements 20 in the same column may be coupled to each other, so as to enhance the coupling energy between the branches 1212 of the two different polarizations of the radiating elements 20 in the same column, thereby forming a strongly coupled feed network circuit 12, and greatly improving the coupling degree.

Referring to fig. 1-3, in one embodiment, an array antenna includes the feed network assembly 10 of any of the above embodiments.

On the one hand, the feeding network circuit 12 is electrically connected with at least one coupler 14, so as to improve the coupling degree and improve the antenna performance; on the other hand, the top surface of the first dielectric layer 11 is provided with the first grounding layer 13, the bottom surface of the first dielectric layer 11 is provided with the second grounding layer 15, so that a strip line structure in which the coupler 14 is clamped between the first grounding layer 13 and the second grounding layer 15 is formed, the coupler 14 is arranged between the first grounding layer 13 and the second grounding layer 15, the external impact and electromagnetic interference are not easy to happen, and particularly, the radiation influence from the radiation unit 20 can be reduced, so that the coupler 14 is coupled in a purer and more linear line, the more stable coupling performance is ensured, the good anti-interference effect is achieved, the stability of the coupling parameter is improved, and the subsequent application of the parameter is facilitated.

Referring to fig. 1, in one embodiment, the array antenna further includes a plurality of radiating elements 20. The radiating elements 20 form a plurality of rows, and the radiating elements 20 are electrically connected to the feed network circuit 12. The radiation unit 20 may be either a single polarized radiation unit or a dual polarized radiation unit, which is flexibly adjusted and set according to actual requirements.

Referring to fig. 1, in one embodiment, the array antenna further includes a plurality of isolation walls 30 disposed above the first ground layer 13. The partition walls 30 are disposed at opposite sides of each row of the radiating elements 20.

Referring to fig. 1, in one embodiment, the array antenna further includes a radome 40 disposed over each radiating element 20.

In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., these terms refer to the orientation or positional relationship based on the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In this application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (16)

1. A feed network assembly, comprising:

the feed network circuit comprises a first feed network, a second feed network and a coupler, wherein the coupler is used for realizing the coupling between the first feed network and the second feed network;

the device comprises a first grounding layer, a first dielectric layer, a second dielectric layer and a second grounding layer, wherein the first grounding layer, the first dielectric layer, the coupler, the second dielectric layer and the second grounding layer are sequentially stacked from top to bottom to form a strip line structure for clamping the coupler between the first grounding layer and the second grounding layer.

2. The feed network assembly of claim 1, wherein the first and second feed networks are disposed at different layers than the coupler; or the first feed network, the second feed network and the coupler are arranged on the same layer.

3. The feed network assembly of claim 1, wherein the first and second feed networks are disposed on the same layer as the first ground layer and cooperate to form a coplanar waveguide structure.

4. The feed network assembly of claim 1, further comprising a third ground plane disposed on the same layer as the coupler, the third ground plane electrically connected to the first ground plane, the third ground plane further electrically connected to the second ground plane.

5. The feed network assembly of claim 4, wherein the third ground layer cooperates with the coupler to form a coplanar waveguide structure.

6. The feed network assembly of claim 4, wherein the first dielectric layer is provided with a first metallized via, and the first ground layer and the third ground layer are electrically connected by the first metallized via.

7. The feed network assembly of claim 4, wherein the third ground layer is soldered or connected to the second ground layer by a conductive connection.

8. The feed network assembly of claim 4, further comprising an insulating spacer connected between the third ground plane and the second ground plane, the third ground plane being coupled to the second ground plane.

9. The feed network assembly of claim 4, wherein the first dielectric layer is a dielectric substrate, and the feed network circuit, the first ground layer, the dielectric substrate, and the third ground layer are PCB circuit boards.

10. The feed network assembly of claim 1, wherein the second ground layer is provided as a reflector.

11. The feed network assembly of claim 10, wherein the reflector plate is provided with a groove corresponding to the position of the coupler, an air cavity is formed between the coupler and the reflector plate through the groove, and the second dielectric layer is the air cavity.

12. The feed network assembly of claim 11, wherein a plurality of the couplers are provided, a plurality of the grooves are provided, and each of the couplers is disposed corresponding to each of the grooves.

13. The feed network assembly of claim 1, wherein the coupler comprises two feed members, the two feed members being connected to the first feed network and the second feed network, respectively.

14. The feed network assembly of any one of claims 1 to 13, wherein the feed network circuit comprises a plurality of power division networks arranged in one-to-one correspondence with each polarization of a plurality of columns of radiating elements; each row of the radiating units corresponds to two power division networks with different polarizations, and each power division network comprises a main path and a branch path;

for two power division networks of the same column of the radiating units, the coupler is used for realizing the coupling between the branches of the two power division networks, and the corresponding branches of the two power division networks are respectively the first feed network and the second feed network;

for two power division networks of the radiation units in adjacent columns, the coupler is used for realizing the coupling between the main paths of the two power division networks, and the corresponding main paths of the two power division networks are respectively the first feed network and the second feed network;

the number of the couplers is multiple, and the couplers can be selectively arranged on the branch circuit and/or the main circuit.

15. An array antenna comprising the feed network assembly of any one of claims 1 to 14.

16. The array antenna of claim 15, further comprising a plurality of radiating elements; the radiation units form a plurality of rows and are electrically connected with the feed network circuit.