Filtering radiation unit and antenna array

Abstract

The present application relates to a filtering radiation unit and an antenna array. The filtering radiation unit (100) has a radiation surface (10); the radiation surface (10) comprises a plurality of oscillator arms (20); the plurality of oscillator arms (20) are arranged in pairs; each oscillator arm (20) comprises a substrate (30) and a filtering circuit (50) arranged on one surface of the substrate (30); filtering circuits (50) of all oscillator arms (20) are located on the same side of corresponding substrates (30); each filtering circuit (50) comprises at least one filtering structure (60); the filtering structure (60) comprises a first strip line (61) and a second strip line (62); a hollow portion (621) is formed at the end of the second strip line (62); a first circuit pattern (611) at the end of the first strip line (61) is located within the hollow portion (621); and there is a preset gap between an outer contour of the first circuit pattern (611) and an inner contour of the hollow portion (621), so that the first circuit pattern (611) and the second strip line (62) are coupled to each other to form a capacitor structure.

Description

Filtering radiating element and antenna array Cross-references

[0001] This application incorporates Chinese Patent Application No. 2024107521516, filed on June 12, 2024, entitled “Filtered Radiation Element and Antenna Array”, which is incorporated herein by reference in its entirety. Technical Field

[0002] This application relates to the field of antenna technology, and in particular to a filter radiation unit and antenna array. Background Technology

[0003] In related technologies, the radiating surface of the filtering unit mostly adopts a filtering design. Specifically, the radiating surface can include a substrate and an LC filter circuit disposed on the substrate. The inductor part of the LC filter circuit is disposed on the front or back of the substrate, and the coupling capacitor is a planar capacitor distributed on both sides of the substrate. Generally, for cost constraints, it is desirable to use a lower-cost material for the substrate, such as FR4 substrate. However, because FR4 substrate has high losses, this results in high capacitor losses, which also affects the antenna gain. Summary of the Invention

[0004] Based on this, this application provides a filtering radiation unit and an antenna array.

[0005] In a first aspect, this application provides a filtering radiation unit, including a radiation surface, a feeding balun, and a base. The feeding balun is connected between the radiation surface and the base. The radiation surface includes multiple oscillating arms, which are arranged in pairs. Each oscillating arm includes a substrate and a filtering circuit disposed on one surface of the substrate. The filtering circuits in all oscillating arms are located on the same side of the corresponding substrate. The filtering circuit includes at least one filtering structure.

[0006] The filter structure includes a first strip and a second strip. The end of the second strip is provided with a hollow part. The first circuit pattern at the end of the first strip is located in the hollow part, and there is a preset gap between the outer contour of the first circuit pattern and the inner contour of the hollow part, so that the first circuit pattern and the second strip are coupled to each other to form a capacitor structure.

[0007] In some embodiments, the cutout includes at least one notch communicating with the outer contour edge of the second strip;

[0008] The first line graphic is inserted into the hollowed-out section from the notch.

[0009] In some embodiments, the first circuit pattern includes a main body and a plurality of branches extending from the main body in a direction away from the main body;

[0010] The inner contour shape of the hollowed-out part matches the outer contour shape of the first line pattern.

[0011] In some embodiments, the width of the first strip is smaller than the width of the second strip;

[0012] There are multiple branches, and these multiple branches are located on the same side in the direction of extension of the main body; or,

[0013] The number of branches is one, and the branch is located at the end of the extension direction of the main body and has a predetermined angle with the main body; or,

[0014] There are two branches, which are located on the same straight line and at the ends of the main body in the direction of extension, and each branch has a preset angle with the main body.

[0015] In some embodiments, the total length of the preset gap is:

[0016] λ / 12-λ / 8, where λ is the wavelength of the operating frequency band of the filter radiation unit.

[0017] In some embodiments, the number of filter structures is at least two, and at least two filter structures are connected in parallel to form a sub-branch;

[0018] The second strip of the filter structure located at the very end of the sub-branch is used to connect to the power supply balun.

[0019] In some embodiments, in two adjacent filter structures in the same sub-branch, the first strip of one filter structure, which is away from the first line pattern, is connected to the second strip of the other filter structure.

[0020] In some embodiments, the filter circuit includes an auxiliary stripline;

[0021] Each filter circuit includes at least two sub-branches. The first strip in the filter structure at one end of each sub-branch is connected to an auxiliary strip, and the second strips in the filter structure at the other end of all sub-branches are connected to each other.

[0022] In some embodiments, the number of oscillator arms is four, the four oscillator arms are orthogonally distributed along two mutually perpendicular axes and are orthogonally polarized, and the substrates of the four oscillator arms are all coplanar with the two axes.

[0023] Each filter circuit includes two sub-branches, and the corresponding substrate has a cutout groove. The two sub-branches are arranged around the cutout groove.

[0024] The pattern of the stripes in the filter structure of the two sub-branches is arranged symmetrically with respect to the axis through which the substrate passes.

[0025] Secondly, this application provides an antenna array including the aforementioned filtering and radiating element.

[0026] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the embodiments described below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0028] Figure 1 is a schematic diagram of the structure of the filter radiation unit provided in an embodiment of this application;

[0029] Figure 2 is a schematic diagram of the connection structure of the first stripline and the second stripline in the filter radiation unit provided in the embodiment of this application;

[0030] Figure 3 is a schematic diagram of the filter radiation unit provided in the embodiment of this application with the first stripe portion of the structure omitted;

[0031] Figure 4 is an equivalent circuit diagram of a filter circuit in the filter radiation unit provided in the embodiment of this application;

[0032] Figure 5 is a schematic diagram of another structure of the first circuit pattern in the filter radiation unit provided in the embodiment of this application;

[0033] Figure 6 is a schematic diagram of another structure of the first circuit pattern in the filter radiation unit provided in the embodiment of this application;

[0034] Figure 7 is a performance comparison diagram of the filter radiation unit provided in the embodiment of this application and the filter radiation unit in related technologies;

[0035] Figure 8 is a schematic diagram of the overall structure of the filter radiation unit provided in the embodiment of this application.

[0036] 100. Filtered radiation unit;

[0037] 10. Radiation surface; 20. Oscillator arm; 30. Substrate; 40. Sub-branch; 50. Filter circuit; 60. Filter structure; 61. First strip line; 611. First circuit pattern; 6111. Main body; 6112. Branch; 62. Second strip line; 621. Hollowed-out part; 622. Notch; 70. Power supply balun; 71. Base;

[0038] 80. Auxiliary strip; 90. Hollowed-out groove; O. Axis; Z. Filter structure group. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0045] Figure 1 is a structural schematic diagram of the filter radiation unit provided in the embodiment of this application; Figure 2 is a schematic diagram of the connection structure of the first strip and the second strip in the filter radiation unit provided in the embodiment of this application; Figure 3 is a structural schematic diagram of the filter radiation unit provided in the embodiment of this application with the first strip omitted; Figure 4 is an equivalent circuit diagram of the filter circuit in the filter radiation unit provided in the embodiment of this application; Figure 7 is a performance comparison diagram of the filter radiation unit provided in the embodiment of this application and the filter radiation unit in related technologies; Figure 8 is a schematic diagram of the overall structure of the filter radiation unit provided in the embodiment of this application.

[0046] The filtering radiating element and antenna array of this application embodiment are described below with reference to the accompanying drawings. Even if different materials are used for the filtering radiating element and antenna array of this application embodiment, the antenna gain will not be affected.

[0047] Referring to Figures 1, 2, 3, and 8, a first aspect of this application provides a filtered radiation unit 100, including a radiation surface 10, a power supply balun 70, and a base 71. The power supply balun 70 is connected between the radiation surface 10 and the base 71. The power supply balun 70 is used to power and support the radiation surface 10.

[0048] The radiating surface 10 includes a plurality of oscillator arms 20, which are arranged in pairs. Each oscillator arm 20 includes a substrate 30 and a filter circuit 50 disposed on one surface of the substrate 30. The filter circuits 50 in all oscillator arms 20 are located on the same side of the corresponding substrate 30. The filter circuit 50 includes at least one filter structure 60.

[0049] The filter structure 60 includes a first strip 61 and a second strip 62. The end of the second strip 62 is provided with a hollow portion 621. The first circuit pattern 611 at the end of the first strip 61 is located inside the hollow portion 621, and there is a preset gap between the outer contour of the first circuit pattern 611 and the inner contour of the hollow portion 621, so that the first circuit pattern 611 and the second strip 62 are coupled to each other to form a capacitor structure.

[0050] The filter structure 60 includes a first strip 61 and a second strip 62. The first strip 61 partially functions as an inductor in the filter circuit 50. A cutout 621 is provided at the end of the second strip 62. A first circuit pattern 611 at the end of the first strip 61 is located within the cutout 621, and a predetermined gap exists between the outer contour of the first circuit pattern 611 and the inner contour of the cutout 621. This allows the first circuit pattern 611 and the second strip 62 to couple together, forming a capacitor structure. Because of the predetermined gap between the cutout 621 of the first circuit pattern 611 and the second strip 62, air is filled within it, thus forming a capacitor structure that functions as a capacitor in the filter circuit 50. Compared to planar capacitors in related technologies, this gap-coupled capacitor formation method ensures that the filter circuits 50 in all vibrator arms 20 are located on the same side of the corresponding substrate 30. The substrate 30 is essentially not involved in the signal transmission attenuation process of the capacitor structure. Changing the material of the substrate 30 will not affect the capacitor's loss value, nor will it affect the antenna's gain. This also reduces the limitations on the choice of substrate 30 material, further reducing the cost of the antenna.

[0051] It should be noted that the first strip 61 and the second strip 62 can be laid flat on the same surface of the corresponding substrate 30, for example, both can be laid on the surface of the substrate 30 away from the power supply balun 70.

[0052] The total length of the preset gap can be λ / 12-λ / 8, where λ is the wavelength of the operating frequency band of the filter radiation unit. For example, the total length of the preset gap can be the total length of its projection onto the substrate 30. This configuration facilitates the formation of coupling capacitors.

[0053] The shape of the first strip 61 can be set to a curved snake shape to have a longer length within a limited layout space. The portion of the first strip 61 that does not enter the cutout 621 can be equivalent to the inductance in the filter circuit 50. The inductance value can be changed by changing the length and winding method of the first strip 61. The width of the second strip 62 can be greater than that of the first strip 61. The capacitance value can be changed by changing the coverage area of ​​the first circuit pattern 611 of the first strip 61 on the substrate 30 and the size of the preset gap. By combining the changes in inductance and capacitance values, the filtering frequency band of the filter circuit 50 can be changed.

[0054] The filter circuit 50 can be located on the side of the substrate 30 away from the feed balun 70. Additionally, the filter radiation unit 100 in this embodiment can be a low-frequency radiation unit.

[0055] In this embodiment of the application, referring to Figures 2 and 3, the cutout portion 621 includes at least one notch 622 communicating with the outer contour edge of the second strip 62. The first line pattern 611 is embedded into the cutout portion 621 from the notch 622.

[0056] In practice, the number of these gaps 622 can be set to one. In this way, the first circuit pattern 611 of the first strip 61 can be formed into a continuous circuit pattern with other parts.

[0057] In this embodiment of the application, the first circuit pattern 611 includes a main body 6111 and a plurality of branch portions 6112 extending from the main body 6111 in a direction away from the main body 6111.

[0058] The inner contour shape of the cutout portion 621 matches the outer contour shape of the first line pattern 611.

[0059] The first circuit pattern 611 includes a main body 6111 and a branch 6112, which allows the first circuit pattern 611 to have a longer path and a larger area. The inner contour shape of the cutout portion 621 matches the outer contour shape of the first circuit pattern 611, allowing the preset gap to be evenly distributed across the outer contour of the first circuit pattern 611, which is beneficial for the formation of coupling capacitors. Specifically, the inner contour of the cutout portion 621 and the outer contour of the first circuit pattern 611 together define the preset gap, and the cross-sectional contour of the preset gap remains unchanged in its extension direction. At this time, the total length of the preset gap along its extension direction is:

[0060] A value within the range of λ / 12 to λ / 8. λ is the wavelength of the operating frequency band of the filter radiation unit.

[0061] In this embodiment of the application, the width of the first strip 61 is smaller than the width of the second strip 62.

[0062] Figure 5 is a schematic diagram of another structure of the first circuit pattern in the filter radiation unit provided in the embodiment of this application, and Figure 6 is a schematic diagram of yet another structure of the first circuit pattern in the filter radiation unit provided in the embodiment of this application.

[0063] In one embodiment, there are multiple branches 6112, and the multiple branches 6112 are located on the same side of the extension direction of the main body 6111. Here, the number of branches 6112 can be, for example, three, and the three branches 6112 can be arranged perpendicular to the main body 6111, as shown in FIG1.

[0064] In some embodiments, the number of branch portions 6112 is one, and the branch portion 6112 is located at the end of the extension direction of the main body portion 6111 and has a predetermined angle with the main body portion 6111, which may be 90 degrees. Alternatively, in some other embodiments, the number of branch portions 6112 may be two, and the two branch portions 6112 are located on the same straight line, and both branch portions 6112 are located at the end of the extension direction of the main body portion 6111, and both have a predetermined angle with the main body portion 6111, for example, perpendicular to it.

[0065] When there are three branches 6112, and the three branches 6112 are located on the same side of the extension direction of the main body 6111, the three branches 6112 can be perpendicular to the main body 6111, and the first line pattern 611 is "E" shaped. Of course, the three branches 6112 can not be perpendicular to the main body 6111, but have an acute angle between them.

[0066] When there is only one branch 6112, and the branch 6112 is located at the end of the extension direction of the main body 6111 and has a preset angle with the main body 6111, such as ninety degrees, the first line pattern 611 is "L" shaped.

[0067] When there are two branches 6112, the two branches 6112 are located on the same straight line, and the two branches 6112 are located at the ends of the extension direction of the main body 6111, and both have a preset angle with the main body 6111, such as ninety degrees, the first line pattern 611 is in the shape of a "T".

[0068] Alternatively, as shown in Figure 5, the number of branches 6112 can be six. The six branches 6112 are arranged in pairs, with the two paired branches 6112 located on both sides of the main body 6111 and on the same straight line.

[0069] Alternatively, as shown in Figure 6, there can be two branches 6112, which extend from the main body 6111 and bend in a direction parallel to the main body 6111.

[0070] Understandably, the number, layout, and shape of the branches 6112 can be set according to actual needs, as long as the preset gaps can be formed.

[0071] In this embodiment of the application, referring to Figures 1 and 4, the number of filter structures 60 is at least two, and at least two filter structures 60 are connected in series to form a sub-branch 40. The second strip 62 of the filter structure 60 located at the far end of the sub-branch 40 is used for electrical connection with the power supply balun 70.

[0072] The second strip 62 of the filter structure 60 located at the far end of the sub-branch 40 serves as a power supply point.

[0073] Furthermore, in two adjacent filter structures 60 within the same sub-branch 40, the end of the first strip line 61 of one filter structure 60 that faces away from the first circuit pattern 611 is connected to the second strip line 62 of the other filter structure 60. This connection is a direct structural connection to achieve electrical connection. In this way, the filter structures 60 can be connected in series sequentially.

[0074] In this embodiment of the application, referring to Figures 1 and 4, the filter circuit 50 includes an auxiliary strip line 80. Each filter circuit 50 includes at least two sub-branches 40. The first strip line 61 in the filter structure 60 at one end of each sub-branch 40 is connected to the auxiliary strip line 80, and the second strip lines 62 in the filter structure 60 at the other end of all sub-branches 40 are connected to each other.

[0075] This allows the two sub-branches 40 to be connected in parallel.

[0076] Referring to the equivalent circuit diagram in Figure 4, the filter structures 60 in each sub-branch 40 are connected in series, and then each sub-branch 40 is connected in parallel.

[0077] It should be noted that in the two series branches, the two filter structures corresponding to the positions can be divided into a functional unit. For example, in Figure 4, the two filter structures 60 located on the left side of the figure and in the two sub-branches 40 form a filter structure group Z, the two filter structures 60 located in the middle of the figure and in the two sub-branches 40 form another filter structure group Z, and the two filter structures 60 located on the right side of the figure and in the two sub-branches 40 form a re-filter structure group Z.

[0078] In this embodiment of the application, referring to FIG1 again, the number of oscillator arms 20 can be four. The four oscillator arms 20 are orthogonally distributed along two mutually perpendicular axes O and are orthogonally polarized. The substrates 30 of the four oscillator arms 20 are all coplanar with the two axes O. For example, the substrates 30 of the four oscillator arms 20 can be integrally formed with each other, so that the four substrates 30 can be coplanar.

[0079] Each filter circuit 50 includes two sub-branches 40, and the corresponding substrate 30 is provided with a cutout groove 90, with the two sub-branches 40 arranged around the cutout groove 90.

[0080] The pattern of the stripes in the filter structure 60 of the two sub-branch 40 is symmetrically arranged with respect to the axis O through which the substrate 30 passes.

[0081] Of course, the filter circuits 50 on each oscillator arm 20 are arranged in a centrally symmetrical manner with respect to the intersection of the two axes O.

[0082] In order to verify the performance of the filtering radiation unit in the embodiments of this application, this application also conducted tests and comparisons on the gain of the filtering radiation unit in related technologies and the radiation unit in the embodiments of this application within a preset frequency band.

[0083] Referring to Figure 7, within the current operating frequency bands of major operators (approximately 0.7GHz-0.96GHz, with a 20MHz redundancy), the gain of the filter radiation unit in this embodiment is basically the same as that of related technologies in the 0.7GHz-0.74GHz frequency band. In the 0.74GHz-0.96GHz frequency band, the gain of the filter radiation unit in this embodiment is greater than that of related technologies, especially in the 0.8GHz-0.96GHz frequency band, where the increase in gain is more significant.

[0084] This application embodiment also provides an antenna array, including the above-mentioned filtering and radiation unit 100. The function, structure, and working principle of the filtering and radiation unit 100 have been described in detail above and will not be repeated here.

[0085] Since the antenna array includes the aforementioned filter radiation unit 100, and the filter structure 60 includes a first strip 61 and a second strip 62, the first strip 61 can function as an inductor in the filter circuit 50. The second strip 62 has a cutout 621 at its end, and the first circuit pattern 611 at the end of the first strip 61 is located within the cutout 621. A predetermined gap exists between the outer contour of the first circuit pattern 611 and the inner contour of the cutout 621, allowing the first circuit pattern 611 and the second strip 62 to couple together to form a capacitor structure. Because of the predetermined gap between the cutout 621 of the first circuit pattern 611 and the second strip 62, air is filled within it, thus forming a capacitor structure that functions as a capacitor in the filter circuit 50. Compared to planar capacitors in related technologies, this gap-coupled capacitor formation method ensures that the filter circuits 50 in all vibrating arms 20 are located on the same side of the corresponding substrate 30. The substrate 30 essentially does not participate in the signal transmission attenuation process of the capacitor structure, and changing the material of the substrate 30 will not affect the capacitor's loss value, thus the antenna gain will not be affected. This also reduces the limitations on the choice of substrate 30 material, which can further reduce the cost of the antenna.

[0086] The beneficial effects of the filtering radiation unit and antenna array in the embodiments of this application are as follows:

[0087] The filtering structure includes a first strip and a second strip. A portion of the first strip acts as an inductor in the filtering circuit. A cutout is provided at the end of the second strip, and a first circuit pattern at the end of the first strip is located within this cutout. A predetermined gap exists between the outer contour of the first circuit pattern and the inner contour of the cutout, allowing the first circuit pattern and the second strip to couple and form a capacitor structure. Because of the predetermined gap between the cutouts of the first circuit pattern and the second strip, air is filled within it, thus forming a capacitor structure that functions as a capacitor in the filtering circuit. Compared to planar capacitors in related technologies, this gap-coupled capacitor formation method ensures that the filtering circuits in all vibrating arms are located on the same side of the corresponding substrate. The substrate essentially does not participate in the signal transmission attenuation process of the capacitor structure, and changing the substrate material does not affect the capacitor's loss value, nor does it affect the antenna gain. This also reduces the limitations on substrate material selection, further reducing antenna costs.

[0088] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0089] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A filter radiation unit, wherein, It includes a radiating surface, a feeding balun, and a base, wherein the feeding balun is connected between the radiating surface and the base; The radiating surface includes multiple oscillating arms, which are arranged in pairs. Each oscillating arm includes a substrate and a filter circuit disposed on one surface of the substrate. The filter circuits in all oscillating arms are located on the same side of the substrate. The filter circuit includes at least one filter structure. The filtering structure includes a first strip and a second strip. The end of the second strip is provided with a hollow portion. The first circuit pattern at the end of the first strip is located in the hollow portion, and there is a preset gap between the outer contour of the first circuit pattern and the inner contour of the hollow portion, so that the first circuit pattern and the second strip are coupled to each other to form a capacitor structure.

2. The filtering radiation unit according to claim 1, wherein, The cutout includes at least one notch that communicates with the outer contour edge of the second strip; The first line pattern is embedded into the hollowed-out portion from the notch.

3. The filtering radiation unit according to claim 2, wherein, The first circuit pattern includes a main body and a plurality of branches extending from the main body in a direction away from the main body; The inner contour shape of the hollowed-out portion matches the outer contour shape of the first circuit pattern.

4. The filtering radiation unit according to claim 3, wherein, The width of the first strip is smaller than the width of the second strip; The number of branches is multiple, and the multiple branches are located on the same side in the extension direction of the main body; or, The number of branches is one, and each branch is located at the end of the main body extending in the direction of extension, and has a predetermined angle with the main body; or, The number of branches is two, the two branches are located on the same straight line, and the two branches are located at the ends of the extension direction of the main body, and both have a preset angle with the main body.

5. The filtering radiation unit according to claim 3, wherein, The total length of the preset gap is: λ / 12-λ / 8, where λ is the wavelength of the operating frequency band of the filter radiation unit.

6. The filtering radiation unit according to any one of claims 1-5, wherein, The number of the filter structures is at least two, and the at least two filter structures are connected in parallel to form a sub-branch; The second strip of the filter structure located at the far end of the sub-branch is used for electrical connection with the power supply balun.

7. The filtering radiation unit according to claim 6, wherein, In two adjacent filter structures in the same sub-branch, the end of the first strip of one filter structure that is away from the first line pattern is connected to the second strip of the other filter structure.

8. The filtering radiation unit according to claim 7, wherein, The filtering circuit includes an auxiliary stripline; Each of the filter circuits includes at least two sub-branches, wherein the first strip in the filter structure at one end of each sub-branch is connected to the auxiliary strip, and the second strip in the filter structure at the other end of all the sub-branches is connected to each other.

9. The filtering radiation unit according to claim 7, wherein, The number of the four oscillator arms is four. The four oscillator arms are orthogonally distributed along two mutually perpendicular axes and are orthogonally polarized. The substrates of the four oscillator arms are all coplanar with the two axes. The pattern of the strip lines in the filtering structure of the two sub-branches is arranged symmetrically with respect to the axis through which the substrate passes.

10. An antenna array, wherein, Includes the filtering radiation unit as described in any one of claims 1-9.

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