Radiating unit and antenna device

Abstract

The invention relates to a radiation unit and an antenna device. The radiation unit comprises a radiation surface and a balun; the radiating surface includes: a support substrate; the at least two filtering units are arranged on the supporting substrate, each filtering unit comprises connecting metal and a plurality of metal air strip line structures, and the connecting metal and the plurality of metal air strip line structures are electrically connected in sequence to form a loop-shaped filtering circuit; part of the metal air strip line structure is located on the first surface, and part of the metal air strip line structure is located on the second surface; the balun comprises a supporting shell which is connected to the second surface of the supporting substrate; the at least one feed balun is connected to the supporting shell, and the ground layer of the feed balun is correspondingly and electrically connected with the two connecting metals located in the same polarization direction; wherein the supporting substrate is provided with a plurality of hollow parts which are arranged in a penetrating manner, and the supporting substrate is configured to be an insulating part. The radiation unit and the antenna device are small in loss, high in efficiency and good in filtering characteristic.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a radiation unit and an antenna device. Background Art

[0002] The radiating unit is the main part of the antenna. It can send and receive electromagnetic waves in a directional manner, thereby realizing wireless communication. As multi-standard fusion antennas and green antennas gradually become the main needs of operators, the filtering characteristics and radiation efficiency characteristics of low-frequency radiating units have become a hot research direction. The radiating surface of the current filtering radiating unit is mostly in the form of PCB. However, the loss caused by the PCB medium will greatly reduce the radiation efficiency of the radiating unit. Summary of the invention

[0003] Based on this, it is necessary to provide a radiation unit and an antenna device with higher radiation efficiency.

[0004] On the one hand, an embodiment of the present application provides a radiation unit, including a radiation surface and a balun;

[0005] The radiating surfaces include:

[0006] A supporting substrate, the supporting substrate comprising a first surface and a second surface arranged opposite to each other; and

[0007] At least two filter units are arranged on the support substrate, each filter unit includes a connecting metal and a plurality of metal air strip line structures, the connecting metal and the plurality of metal air strip line structures are electrically connected in sequence to form a loop-shaped filter circuit; part of the metal air strip line structure is located on the first surface, and part of the metal air strip line structure is located on the second surface;

[0008] The balun includes:

[0009] A supporting shell connected to the second surface of the supporting substrate; and

[0010] At least one feeding balun is connected to the supporting shell, the feeding balun is configured as a microstrip transmission line, and the ground layer of the feeding balun is electrically connected to two connecting metals located in the same polarization direction;

[0011] A plurality of hollow parts are formed on the support substrate, and the support substrate is configured as an insulating member.

[0012] In one of the embodiments, the first surface and the second surface of the support substrate are both provided with a matching portion;

[0013] Two metal air strip line structures electrically connected to each other and respectively located on the first surface and the second surface are connected to the support substrate by hot melting or snap-fitting with corresponding matching parts.

[0014] In one embodiment, projections of two metal air strip line structures adjacent to each other and located on the first surface and the second surface respectively on the reference plane have overlapping parts so as to be coupled to each other;

[0015] The projection of the matching portion on the reference plane is located within the setting range of the overlapping portion, and the reference plane is perpendicular to the thickness direction of the support substrate.

[0016] In one embodiment, two metal air strip line structures coupled to each other are parallel to each other and have a preset interval in the thickness direction of the supporting substrate.

[0017] In one of the embodiments, a portion of the plurality of metal air stripline structures is constructed as a first stripline structure, the first stripline structure comprising a first filter stripline, a first stripline, and a first coupling element connected in sequence;

[0018] In two first stripline structures adjacent to each other and respectively located on the first surface and the second surface, a projection of a first coupling element of one first stripline structure and a first stripline of another first stripline structure on the reference plane at least partially overlap to form an overlapping portion.

[0019] In one of the embodiments, another portion of the plurality of metal air stripline structures is constructed as a second stripline structure, the second stripline structure comprising a second stripline, two second filter striplines, and two second coupling elements;

[0020] The two second filter strip lines are both connected to the second strip line, and the second filter strip lines are connected to the second coupling elements in a one-to-one correspondence;

[0021] One of the adjacent first and second stripline structures is located on the first surface and the other is located on the second surface, and the second coupling element of the second stripline structure at least partially overlaps with the projection of the first stripline of the first stripline structure on the reference plane to form an overlapping portion.

[0022] In one embodiment, in the filter unit, the number of the connecting metal and the second stripline structure is one, and the number of the first stripline structure is an even number;

[0023] The connection metal is located on the first surface of the support substrate;

[0024] The connection metal, the first strip line structure and the second strip line structure in the filter unit are alternately arranged on opposite sides of the support substrate in a connection sequence.

[0025] In one embodiment, one of the adjacent connecting metal and metal air strip line structures is located on the first surface and the other is located on the second surface;

[0026] The metal air strip line structure is connected with the connecting metal coupling.

[0027] In one of the embodiments, both the first surface and the second surface of the support substrate are provided with positioning portions;

[0028] The metal air strip line structure and the connection metal coupled to each other are connected to the support substrate through corresponding positioning parts by means of hot melting or snap fitting;

[0029] The positioning portion is disposed at a coupling position between the metal air strip line structure and the connection metal.

[0030] In one embodiment, the connecting metal is constructed as a metal air strip line;

[0031] Alternatively, the radiation surface includes a printed circuit board, and the connection metal is arranged on the surface of the printed circuit board.

[0032] In one of the embodiments, the connection end of the feed balun facing the radiation surface passes through the hollow portion of the support substrate and is plugged into the corresponding connection metal.

[0033] In one embodiment, the support substrate includes an outer frame and a plurality of ribs connected to the inner side of the outer frame. The plurality of ribs are spaced apart from each other and cross-arranged to form a grid.

[0034] In one embodiment, each connecting metal and metal air strip line structure is correspondingly provided with ribs.

[0035] In one embodiment, the radiation unit is a dual-polarization radiation unit, the number of the filtering units is four, the number of the feeding baluns is two, and the filtering units are arranged in pairs in mutually orthogonal polarization directions.

[0036] In one embodiment, the supporting shell and the supporting base plate are constructed as an integrated structure.

[0037] In one of the embodiments, the radiation unit further includes a base, a side of the feed balun facing away from the radiation surface is connected to the base, and the base is connected to the supporting shell.

[0038] The embodiment of the present application also provides an antenna device, including a reflector and the above-mentioned radiation unit;

[0039] The supporting shell of the radiation unit is connected to the reflecting plate.

[0040] The beneficial effects of the above-mentioned radiation unit and antenna device are as follows:

[0041] By providing a support shell and connecting the support shell to the second surface of the support substrate, the filter unit is provided on the support substrate, so that the support shell only needs to be fixed to an external mounting component, such as a reflector, and the support substrate and the filter unit thereon can be supported and positioned by the support shell. At least one feed balun is connected to the support shell, so that the feed balun can be connected to the support shell to achieve relative positioning with the support substrate and the filter unit.

[0042] In addition, part of the metal air stripline structure is located on the first surface, and part of the metal air stripline structure is located on the second surface, which is more flexible in layout. Compared with the solution in which all metal air stripline structures are arranged on the same side of the supporting substrate, the radiation unit can also form better filtering characteristics. Furthermore, a plurality of hollow parts are constructed on the supporting substrate, and the supporting substrate is configured as an insulating member. In this way, compared with the case where the entire radiation surface is PCB dielectric, there is no dielectric loss in the area where the hollow parts are arranged, that is, there is no dielectric loss in at least part of the area on the radiation surface, which reduces the dielectric loss of the radiation surface, and thus can improve the radiation efficiency of the radiation unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A schematic diagram of the structure of a radiation unit provided in an embodiment of the present application;

[0044] Figure 2 A schematic diagram of the decomposed structure of the radiation unit provided in an embodiment of the present application;

[0045] Figure 3 A schematic diagram of another structure of a radiation unit provided in an embodiment of the present application;

[0046] Figure 4 A schematic diagram of an exploded structure of another structure of a radiation unit provided in an embodiment of the present application;

[0047] Figure 5 A schematic top view showing the connection relationship between the metal connection and the metal air strip line structure in the radiation unit provided in the embodiment of the present application;

[0048] Figure 6 A schematic diagram showing the connection relationship between the metal and metal air strip line structures in the radiation unit provided in the embodiment of the present application;

[0049] Figure 7 A schematic diagram of an exploded structure showing the connection relationship between the metal and metal air strip line structures in the radiation unit provided in the embodiment of the present application;

[0050] Figure 8 This is a comparison chart of the efficiency of the radiation unit provided in the embodiment of the present application and the radiation unit of the related art.

[0051] Description of Figure Numbers:

[0052] 100. Radiating unit;

[0053] 10. radiating surface; 11. printed circuit board; 111. plug-in slot; 112. through slot; 20. supporting substrate; 201. first surface; 202. second surface; 21. hollow portion; 22. positioning portion; 221. second through hole; 23. matching portion; 231. first through hole; 24. outer frame; 241. first frame structure; 242. second frame structure; 25. ribs; 243. ring frame structure;

[0054] 30. Filter unit;

[0055] 40. Connecting metals;

[0056] 50. Metal air stripline structure; 51. First stripline structure; 511. First filter stripline; 512. First stripline; 513. First coupling element; 52. Second stripline structure; 521. Second stripline; 522. Second filter stripline; 523. Second coupling element;

[0057] 60, balun; 61, supporting shell; 62, feeding balun; 620, stratum; 621, connecting end; 622, feeding metal; 623, dielectric plate;

[0058] 70. Base. DETAILED DESCRIPTION

[0059] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0061] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0064] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0065] The radiation unit and antenna device of the embodiments of the present application are described below with reference to the accompanying drawings.

[0066] Figure 1 A schematic diagram of the structure of a radiation unit provided in an embodiment of the present application; Figure 2 A schematic diagram of the decomposed structure of the radiation unit provided in an embodiment of the present application; Figure 3 A schematic diagram of another structure of a radiation unit provided in an embodiment of the present application; Figure 4 A schematic diagram of an exploded structure of another structure of a radiation unit provided in an embodiment of the present application; Figure 5 A schematic top view showing the connection relationship between the metal connection and the metal air strip line structure in the radiation unit provided in the embodiment of the present application; Figure 6 A schematic diagram showing the connection relationship between the metal and metal air strip line structures in the radiation unit provided in the embodiment of the present application; Figure 7 A schematic diagram of the exploded structure showing the connection relationship between the metal and metal air strip line structures in the radiation unit provided in the embodiment of the present application.

[0067] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 The radiation unit 100 provided in the embodiment of the present application includes a radiation surface 10 and a balun 60 .

[0068] The radiation surface 10 includes a support substrate 20 and at least two filter units 30 disposed on the support substrate 20. The support substrate 20 includes a first surface 201 and a second surface 202 disposed opposite to each other. In the at least two filter units 30, each filter unit 30 includes a connecting metal 40 and a plurality of metal air stripline structures 50, and the connecting metal 40 and the plurality of metal air stripline structures 50 are electrically connected in sequence to form a loop-shaped filter circuit. Part of the metal air stripline structure 50 is located on the first surface 201, and part of the metal air stripline structure 50 is located on the second surface 202.

[0069] The balun 60 includes a support shell 61 and at least one feed balun 62. The support shell 61 is connected to the second surface 202 of the support substrate 20. The feed balun 62 is connected to the support shell 61, and the feed balun 62 is configured as a microstrip line transmission line, and the ground layer 620 of the feed balun 62 is electrically connected to two connection metals 40 located in the same polarization direction. Among them, a plurality of hollow parts 21 are constructed on the support substrate 20, and the support substrate 20 is configured as an insulating member.

[0070] By providing a support shell 61 and connecting the support shell 61 to the second surface 202 of the support substrate 20, the filter unit 30 is provided on the support substrate 20, so that the support shell 61 only needs to be fixed to an external mounting component, such as a reflector, and the support substrate 20 and the filter unit 30 thereon can be supported and positioned by the support shell 61. The feed balun 62 is connected to the support shell 61, so that the feed balun 62 can be connected to the support shell 61 to achieve relative positioning with the support substrate 20 and the filter unit 30.

[0071] In addition, part of the metal air stripline structure 50 is located on the first surface 201, and part of the metal air stripline structure 50 is located on the second surface 202. The layout is more flexible, and compared with the solution in which all metal air stripline structures are arranged on the same side of the support substrate, the radiation unit 100 can also form a better filtering characteristic. Further, a plurality of hollow portions 21 are configured on the support substrate 20, and the support substrate 20 is configured as an insulating member. In this way, compared with the case where the entire surface of the radiation surface 10 is PCB dielectric, there is no dielectric loss in the area where the hollow portions 21 are arranged, that is, there is no dielectric loss in at least part of the area on the radiation surface 10, which reduces the dielectric loss of the radiation surface 10, and thus can improve the radiation efficiency of the radiation unit 100.

[0072] It can be understood that in the embodiment of the present application, the radiation unit 100 is a dual-polarization radiation unit for example, wherein the number of the filter units 30 is four, the number of the feed baluns 62 is two, and the four filter units 30 are arranged in pairs in mutually orthogonal polarization directions. In the case where the radiation unit 100 is a single-polarization radiation unit, the number of the filter units 30 is two, the number of the feed baluns 62 is one, and the connection of each part in this case is similar to that of the dual-polarization radiation unit, and is not illustrated here.

[0073] The support substrate 20 is a plastic part. The connecting metal 40 and the multiple metal air stripline structures 50 can be coupled and connected in pairs to form a filter circuit. In some embodiments, the connecting metal 40 and the multiple metal air stripline structures 50 can be connected end to end in sequence to form a ring-shaped filter circuit. Part of the metal air stripline structure 50 is located on the first surface 201, and part of the metal air stripline structure 50 is located on the second surface 202. It means that among the multiple metal air stripline structures 50, at least part is located on the first surface 201, and at least part is located on the second surface 202. For the metal air stripline structures 50 located on the same surface, they can be directly connected to each other to achieve electrical connection, and for the metal air stripline structures 50 located on different surfaces, they can be connected by coupling through the support substrate 20. Compared with direct connection, the coupling connection method can also make the filtering effect of the radiation unit 100 better.

[0074] In addition, the support substrate 20 is constructed with a number of hollow portions 21 extending therethrough. The area and number of the hollow portions 21 can be set according to actual needs. It can be understood that the larger the area of ​​the hollow portion 21, the more obvious the effect of reducing dielectric loss.

[0075] Further, refer to Figure 2, the feed balun 62 can be configured as a printed circuit board, the feed balun 62 includes a dielectric plate 623, a ground layer 620 and a feed metal 622, the ground layer 620 can be arranged on the back of the dielectric plate 623, and the feed metal 622 can be arranged on the front of the dielectric plate 623. The end of each feed balun 62 facing the radiation surface 10 is defined as a connection end 621, and the ground layer 620 also extends to the connection end 621 to facilitate the corresponding connection with the corresponding connection metal 40. In this way, the two connection ends 621 of the feed balun 62 can be connected to the two connection metals 40 in one polarization direction by welding. It can be understood that at the welding position of the feed balun 62 and the connection metal 40, local electroplating can be performed to facilitate welding. Alternatively, the feed balun 62 and the connection metal 40 can be electroplated as a whole.

[0076] In the embodiment of the present application, Figure 1 , Figure 2 In the solution, the radiation surface 10 includes a printed circuit board 11, and the connection metal 40 is arranged on the surface of the printed circuit board 11. The two connection ends 621 of the feeding balun 62 pass through the hollow portion 21 of the supporting substrate 20 and are plugged into the corresponding connection metal 40 of the printed circuit board 11.

[0077] In some embodiments, a plug-in slot 111 is provided on the printed circuit board 11 , and the connection ends 621 are plugged into the plug-in slot 111 in a one-to-one correspondence, thereby facilitating the relative positioning of the printed circuit board 11 and the feeding balun 62 .

[0078] Further, the printed circuit board 11 is located on the first surface 201 of the support substrate 20. In this way, the printed circuit board 11 is on the side of the support substrate 20 away from the feed balun 62, that is, the printed circuit board 11 is located on the outermost side of the radiation unit 100, which facilitates the welding operation between the feed balun 62 and the printed circuit board 11. Of course, the connection metal 40 can be located on the surface of the printed circuit board 11 away from the support substrate 20, so as to facilitate the operator to weld the connection metal 40 and the feed balun 62.

[0079] exist Figure 3 , Figure 4 In the radiation unit 100 of another structure shown, the connection metal 40 is configured as a metal air strip line, and the connection metal 40 can be located on the first surface 201 of the support substrate 20. Figure 1 , Figure 2 Similarly to the solution of , such a configuration facilitates the welding of the connection metal 40 and the feeding balun 62. And the two connection ends 621 of the feeding balun 62 penetrate the hollow portion 21 of the supporting substrate 20 and are plugged into the corresponding connection metal 40. The connection metal 40 may be provided with a through groove 112 for the connection ends 621 to be plugged one by one.

[0080] Furthermore, the connection metal 40 is located on the first surface 201 of the support substrate 20. This arrangement facilitates the installation of the support substrate 20. Of course, in practical applications, the connection metal 40 or the printed circuit board 11 can also be arranged on the second surface 202 of the support substrate 20.

[0081] Continue to refer to Figure 2 and Figure 4 The radiation unit 100 further includes a base 70, a side of the feed balun 62 facing away from the radiation surface 10 is connected to the base 70, and the base 70 is connected to the support shell 61. Specifically, the base 70 can be positioned on the support shell 61 by components such as plastic clips. The base 70 can be in the form of a printed circuit board.

[0082] Furthermore, a receiving cavity is constructed in the support shell 61, and the feeding balun 62 is received in the receiving cavity of the support shell 61. Since one end of the feeding balun 62 is connected to the connection metal 40, and the other end is connected to the base 70, and the base 70 is connected to the support shell 61, the feeding balun 62 can be fixed relative to the support shell 61.

[0083] In the present application embodiment, combined Figure 5 , Figure 6 , Figure 7 ,exist Figure 5 In the figure, for the convenience of observation, the metal air strip line structure 50 disposed on the second surface 202 of the support substrate 20 is indicated by a dotted line.

[0084] Furthermore, both the first surface 201 and the second surface 202 of the support substrate 20 are provided with a matching portion 23 .

[0085] The two metal air strip line structures 50 , which are electrically connected to each other and are located on the first surface 201 and the second surface 202 , respectively, are connected to the support substrate 20 by hot melting or snap-fitting with the corresponding matching parts 23 .

[0086] The mating portion 23, for example, can be a columnar structure integrally formed on the supporting substrate 20, and a local expanded neck is provided at the end of the mating portion 23. A first through hole 231 is provided at a position corresponding to the mating portion 23 on the metal air strip line structure 50. After the mating portion 23 is inserted into the corresponding first through hole 231, the local expanded neck at the end of the mating portion 23 is clamped with the edge of the hole opening of the first through hole 231, thereby positioning the metal air strip line structure 50 relative to the supporting substrate 20.

[0087] Combination Figure 5, the projections of the two metal air stripline structures 50 adjacent to each other and respectively located on the first surface 201 and the second surface 202 on the reference plane have overlapping parts, so as to be coupled and connected to each other. The projection of the matching portion 23 on the reference plane is located within the setting range of the overlapping part, wherein the reference plane is perpendicular to the thickness direction of the support substrate 20, and illustratively, the reference plane can be parallel to the first surface 201 and the second surface 202. In this way, the two metal air stripline structures 50 can be coupled and connected. The projection of the matching portion 23 on the reference plane is located within the setting range of the overlapping part, which can make the coupling gap of the two metal air stripline structures 50 more stable.

[0088] In addition, the two metal air strip line structures 50 coupled to each other are parallel to each other and have a preset interval in the thickness direction of the support substrate 20 to achieve coupling of the two metal air strip line structures 50 .

[0089] In some embodiments, in combination Figure 5 and Figure 7 Among the multiple metal air stripline structures 50, some are constructed as a first stripline structure 51, and the first stripline structure 51 includes a first filter stripline 511, a first stripline 512 and a first coupling element 513 connected in sequence.

[0090] In two first stripline structures 51 adjacent to each other and respectively located on the first surface 201 and the second surface 202, the projection of the first coupling element 513 of one first stripline structure 51 on the reference plane at least partially overlaps with the projection of the first stripline 512 of the other first stripline structure 51 to form an overlapping portion. In this way, the two first stripline structures 51 can be coupled and connected.

[0091] In some other embodiments, continue to refer to Figure 5 and Figure 7 Among the multiple metal air stripline structures 50 , another part is constructed as a second stripline structure 52 , and the second stripline structure 52 includes a second stripline 521 , two second filter striplines 522 and two second coupling elements 523 .

[0092] The two second filter strip lines 522 are both connected to the second strip line 521 , and the second filter strip lines 522 are connected to the second coupling elements 523 in a one-to-one correspondence.

[0093] In the first stripline structure 51 and the second stripline structure 52 adjacent to each other, one is located on the first surface 201 and the other is located on the second surface 202, and the second coupling element 523 of the second stripline structure 52 at least partially overlaps with the projection of the first stripline 512 of the first stripline structure 51 on the reference plane to form an overlapping portion. In this way, the coupling connection between the first stripline structure 51 and the second stripline structure 52 can be achieved.

[0094] Furthermore, in the filter unit 30, the number of the connection metal 40 and the second stripline structure 52 is one, and the number of the first stripline structure 51 is an even number. The connection metal 40 is located on the first surface 201 of the support substrate 20 to facilitate the welding operation of the connection metal 40 and the feed balun 62.

[0095] Furthermore, the connection metal 40 , the first strip line structure 51 and the second strip line structure 52 in the filter unit 30 are alternately arranged on opposite sides of the support substrate 20 in a connection sequence.

[0096] For example, in Figure 1 , Figure 5 In the example, the Figure 5 Taking the filter unit 30 at the lower left corner as an example, the connection metal 40 is located on the first surface 201, the two first strip line structures 51 adjacent to the connection metal 40 are located on the second surface 202, the two first strip line structures 51 adjacent to each other are located on the first surface 201, and the second strip line structure 52 is located on the second surface 202. It should be noted that the structures of the filter units 30 on the radiation surface 10 are the same and are arranged symmetrically relative to the center of the radiation surface 10.

[0097] In some other embodiments, the connection metal 40 may be located on the second surface 202 , two first strip line structures 51 adjacent to the connection metal 40 may be located on the first surface 201 , two adjacent first strip line structures 51 may be located on the second surface 202 , and the second strip line structure 52 may be located on the first surface 201 .

[0098] It is understandable that in Figure 5 In the example, a filter unit 30, such as the filter unit 30 in the upper left corner, forms a symmetrical filter circuit, in which the number of the first filter strip line 511 and the second filter strip line 522 in one branch is three, so the filter unit 30 is a 3-stage filter structure. In some other embodiments, the number of the first filter strip line 511 and the second filter strip line 522 in a branch can also be other, but this number is also the number of stages of the filter structure. Here, the number of stages of the filter structure can be set according to actual needs, for example, it can be 4 levels, 5 levels, etc.

[0099] In the present application, continue to refer to Figure 5 and Figure 7 In the adjacent connection metal 40 and metal air stripline structure 50, one is located on the first surface 201 and the other is located on the second surface 202. The metal air stripline structure 50 is coupled to the connection metal 40. In this way, the radiation efficiency of the radiation unit 100 can be improved.

[0100] In some embodiments, in combination Figure 2 , Figure 5 and Figure 7 The first surface 201 and the second surface 202 of the supporting substrate 20 are both provided with positioning portions 22 .

[0101] The metal air strip line structure 50 and the connection metal 40 coupled to each other are connected to the support substrate 20 through the corresponding positioning portion 22 by means of hot melting or snap fitting.

[0102] The positioning portion 22 can be, for example, a columnar structure integrally formed on the support substrate 20, and a partially enlarged neck is provided at the end of the positioning portion 22. A second through hole 221 is provided at the metal air strip line structure 50 and the connecting metal 40 at a position corresponding to the positioning portion 22. After the positioning portion 22 is inserted into the corresponding second through hole 221, the partially enlarged neck at the end of the positioning portion 22 is engaged with the edge of the opening of the second through hole 221, that is, the metal air strip line structure 50, the connecting metal 40 and the support substrate 20 are relatively positioned. The positioning portion 22 is arranged at the coupling position of the first coupling element 513 and the connecting metal 40. In this way, when the connecting metal 40 and the metal air strip line structure 50 are coupled to each other, the coupling gap is ensured to be fixed.

[0103] In the present application embodiment, combined Figure 1 and Figure 2 The support substrate 20 includes an outer frame 24 and a plurality of ribs 25 connected to the inner side of the outer frame 24. The plurality of ribs 25 are spaced apart from each other and cross-arranged to form a grid. The grid can form a hollow portion 21. In some embodiments, each connection metal 40 and metal air strip line structure 50 is provided with a corresponding rib 25.

[0104] The width of the rib 25 may be smaller than that of the corresponding metal air stripline structure 50 , so as to minimize dielectric loss. The extension direction of at least part of the rib 25 may be the same as that of the corresponding metal air stripline structure 50 .

[0105] In the embodiment of the present application, as described above, when the radiation unit 100 is a dual-polarization radiation unit, the number of the filter units 30 is four, the number of the feed baluns 62 is two, and the filter units 30 are arranged in pairs in mutually orthogonal polarization directions.

[0106] The outer frame 24 is constructed as a first frame structure 241, and some of the ribs 25 are connected to each other to form a second frame structure 242, and the second frame structure 242 is located inside the first frame structure 241. In addition, some of the ribs 25 are also formed into a ring frame structure 243, and the ring frame structure 243 is located between the first frame structure 241 and the second frame structure 242. Some of the ribs 25 are connected to the first frame structure 241, the ring frame structure 243, and the second frame structure 242 in sequence, so as to strengthen the structure of the support substrate 20.

[0107] Furthermore, the support shell 61 and the support substrate 20 are constructed as an integrated structure, so that the feed balun 62 and the radiation surface 10 can be supported with a simple structure.

[0108] Figure 8 This is a comparison chart of the efficiency of the radiation unit provided in the embodiment of the present application and the radiation unit of the related art. The radiation unit in the related art adopts the form of PCB. Figure 8 In the figure, the horizontal axis is the operating frequency of the radiation unit, and the vertical axis is the radiation efficiency value. Figure 8 It can be seen that the efficiency of the radiation unit 100 of the present application is always greater than the efficiency of the radiation unit in the related art within its operating frequency band (roughly within the range of 690 GHz-960 GHz).

[0109] The embodiment of the present application further provides an antenna device, which includes a reflector and the above-mentioned radiation unit 100 , wherein the support shell 61 of the radiation unit 100 is connected to the reflector.

[0110] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0111] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A radiation unit, characterized in that: Including radiating surface and balun; The radiating surface comprises: a supporting substrate, the supporting substrate comprising a first surface and a second surface disposed opposite to each other; and At least two filter units are provided on the support substrate, each of the filter units comprises a connecting metal and a plurality of metal air strip line structures, the connecting metal and the plurality of metal air strip line structures are electrically connected in sequence to form a loop-shaped filter circuit; part of the metal air strip line structures are located on the first surface, and part of the metal air strip line structures are located on the second surface; The balun includes: a supporting shell connected to the second surface of the supporting substrate; and At least one feeding balun is connected to the supporting shell, the feeding balun is configured as a microstrip transmission line, and the ground layer of the feeding balun is electrically connected to the two connecting metals located in the same polarization direction; Wherein, the support substrate is configured with a plurality of hollow parts penetrating therethrough, and the support substrate is configured as an insulating member.

2. The radiation unit according to claim 1, characterized in that: The first surface and the second surface of the support substrate are both provided with a matching portion; The two metal air strip line structures electrically connected to each other and respectively located on the first surface and the second surface are connected to the support substrate by hot melting or snap-fitting with the corresponding matching parts.

3. The radiation unit according to claim 2, characterized in that: Projections of the two metal air strip line structures adjacent to each other and located on the first surface and the second surface respectively on the reference plane have overlapping parts so as to be coupled and connected to each other; A projection of the matching portion on the reference plane is located within a setting range of the overlapping portion, and the reference plane is perpendicular to a thickness direction of the support substrate.

4. The radiation unit according to claim 3, characterized in that: The two metal air strip line structures coupled to each other are parallel to each other and have a preset interval in the thickness direction of the support substrate.

5. The radiation unit according to claim 3, characterized in that: Among the plurality of metal air stripline structures, part is constructed as a first stripline structure, wherein the first stripline structure comprises a first filter stripline, a first stripline and a first coupling element connected in sequence; In two first stripline structures adjacent to each other and respectively located on the first surface and the second surface, the first coupling element of one first stripline structure at least partially overlaps with a projection of the first stripline of another first stripline structure on the reference plane to form the overlapping portion.

6. The radiation unit according to claim 5, characterized in that: Another portion of the plurality of metal air stripline structures is constructed as a second stripline structure, the second stripline structure comprising a second stripline, two second filter striplines and two second coupling elements; Two of the second filter strip lines are connected to the second strip line, and the second filter strip lines are connected to the second coupling elements in a one-to-one correspondence; Among the first stripline structure and the second stripline structure adjacent to each other, one is located on the first surface and the other is located on the second surface, and the second coupling element of the second stripline structure at least partially overlaps with the projection of the first stripline of the first stripline structure on the reference plane to form the overlapping portion.

7. The radiation unit according to claim 6, characterized in that: In the filtering unit, the number of the connecting metal and the number of the second stripline structure are both one, and the number of the first stripline structure is an even number; The connection metal is located on the first surface of the support substrate; The connection metal, the first strip line structure and the second strip line structure in the filter unit are alternately arranged on opposite sides of the support substrate in a connection sequence.

8. The radiation unit according to any one of claims 1 to 7, characterized in that: One of the connection metal and the metal air strip line structure adjacent to each other is located on the first surface, and the other is located on the second surface; The metal air strip line structure is coupled to the connection metal.

9. The radiation unit according to claim 8, characterized in that: The first surface and the second surface of the support substrate are both provided with positioning parts; The metal air strip line structure and the connection metal coupled to each other are connected to the support substrate by means of hot melting or snap fitting through the corresponding positioning parts; The positioning portion is disposed at a coupling position between the metal air strip line structure and the connection metal.

10. The radiation unit according to any one of claims 1 to 7, characterized in that: The connecting metal structure is a metal air strip line; Alternatively, the radiation surface includes a printed circuit board, and the connection metal is arranged on a surface of the printed circuit board.

11. The radiation unit according to claim 10, characterized in that: The connection end of the feeding balun facing the radiation surface passes through the hollow portion of the supporting substrate and is plugged into the corresponding connection metal.

12. The radiation unit according to any one of claims 1 to 7, characterized in that: The support substrate comprises an outer frame and a plurality of ribs connected to the inner side of the outer frame. The plurality of ribs are spaced apart from each other and cross-arranged to form a grid shape.

13. The radiation unit according to claim 12, characterized in that: Each of the connecting metals and the metal air strip line structure is correspondingly provided with the ribs.

14. The radiation unit according to any one of claims 1 to 7, characterized in that: The radiation unit is a dual-polarization radiation unit, the number of the filter units is four, the number of the feed baluns is two, and the filter units are arranged in pairs in mutually orthogonal polarization directions.

15. The radiation unit according to any one of claims 1 to 7, characterized in that: The supporting shell and the supporting base plate are constructed as an integrated structure.

16. The radiation unit according to claim 15, characterized in that: The radiation unit further includes a base, a side of the feed balun facing away from the radiation surface is connected to the base, and the base is connected to the supporting shell.

17. An antenna device, characterized in that: A reflector comprising a reflector and a radiation unit as claimed in any one of claims 1 to 16; The supporting shell of the radiation unit is connected to the reflecting plate.

Images