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) includes a radiation surface (10). The radiation surface (10) includes multiple dipole arms (20). The multiple dipole arms (20) are arranged in pairs. Each dipole arm (20) includes a substrate (30) and a filtering circuit (50) disposed on a surface of the substrate (30). The filtering circuits (50) in all the dipole arms (20) are located on a same side of respective substrates (30). The filtering circuit (50) includes at least one filtering structure (60). The filtering structure (60) includes a first microstrip (61) and a second microstrip (62), an end portion of the second microstrip (62) is provided with a hollow portion (621), a first line drawing (611) at an end portion of the first microstrip (61) is located within the hollow portion (621), and a preset gap exists between an outer contour of the first line drawing (611) and an inner contour of the hollow portion (621), so that the first line drawing (611) and the second microstrip (62) are coupled to each other to form a capacitor structure.

Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims priority to Chinese patent application No. 2024107521516, titled "FILTERING RADIATION UNIT AND ANTENNA ARRAY" and filed on June 12, 2024, the content of which is hereby incorporated by reference in its entirety.TECHNICAL FIELD

[0002] The present application relates to the technical field of antennas, and particularly, to a filtering radiation unit and an antenna array.BACKGROUND

[0003] In the related technology, radiation surfaces of filtering units are mostly designed with filtering function. Specifically, the radiation surface may include a substrate, and an LC filtering circuit arranged on the substrate. An inductor in the LC filtering circuit is arranged on a front surface or a back surface of the substrate, and a coupling capacitor in the LC filtering circuit is a plate capacitor distributed on the front surface and the back surface of the substrate. Generally, considering cost constraint, the substrate is preferred to be made of a material of relatively low cost, such as an FR4 laminate. However, the FR4 laminate has relatively high loss, and the capacitor may have relatively high loss consequently, which affects the antenna gain.SUMMARY

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

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

[0006] The filtering structure includes a first microstrip and a second microstrip, an end portion of the second microstrip is provided with a hollow portion, a first line drawing at an end portion of the first microstrip is located within the hollow portion, and a preset gap exists between an outer contour of the first line drawing and an inner contour of the hollow portion, so that the first line drawing and the second microstrip are coupled to each other to form a capacitor structure.

[0007] In some embodiments, the hollow portion includes at least one notch in communication with an outer contour edge of the second microstrip; and the first line drawing is embedded from the notch into the hollow portion.

[0008] In some embodiments, the first line drawing includes a main body portion and multiple branch portions extending from the main body portion in a direction away from the main body portion; a shape of the inner contour of the hollow portion matches that of the outer contour of the first line drawing.

[0009] In some embodiments, a width of the first microstrip is less than that of the second microstrip; multiple branch portions are provided, and the multiple branch portions are located on a same side an extension direction of the main body portion; or one branch portion is provided, and the branch portion is located at an end portion of the main body portion in the extension direction and forms a preset angle with the main body portion; or two branch portions are provided, the two branch portions are located on one straight line, and the two branch portions are located at an end portion of the main body portion in the extension direction and each forming a preset angle with the main body portion.

[0010] In some embodiments, a total length of the preset gap ranges from λ / 12 to λ / 8, where λ denotes a wavelength of an operating frequency band of the filtering radiation unit.

[0011] In some embodiments, at least two filtering structures are provided, the at least two filtering structures being connected in parallel to form a sub-branch; the second microstrip of the filtering structure located at an outermost end portion of the sub-branch is configured to be electrically connected to the feed balun.

[0012] In some embodiments, in two adjacent filtering structures in a same sub-branch, one end of the first microstrip of one filtering structure away from the first line drawing is connected to the second microstrip of the other filtering structure.

[0013] In some embodiments, the filtering circuit includes an auxiliary microstrip; each filtering circuit includes at least two sub-branches, the first microstrip in the filtering structure at one end portion of each sub-branch is connected to the auxiliary microstrip, and the second microstrips in the filtering structures at the other end portions of the at least two sub-branches are connected to each other.

[0014] In some embodiments, four dipole arms are provided, the four dipole arms are orthogonally distributed along two mutually perpendicular axes and have orthogonal polarizations, and the substrates of the four dipole arms are coplanar with the two axes; each filtering circuit includes two sub-branches, the corresponding substrate is provided with a hollow groove, and the two sub-branches are arranged around the hollow groove; and patterns of the microstrips in the filtering structures of the two sub-branches are symmetrically arranged relative to an axis passing through the substrate.

[0015] In a second aspect, the present application provides an antenna array, including the foregoing filtering radiation unit.

[0016] The above description is only a summary of the technical solutions of the present application, for understanding the technical means of the present application more clearly and implementing the present application according to the contents of the specification. Furthermore, to make the above and other objectives, features, and advantages of the present application more comprehensible, specific implementations of the present application are set forth as follows.BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits shall be apparent for those of ordinary skill in the art by reading detailed descriptions of the following implementations. The accompanying drawings are merely for illustrating the implementations, rather than for limiting the present application. Moreover, an identical reference numeral is used to indicate an identical member throughout the accompanying drawings. Among the accompanying drawings: FIG. 1 is a schematic structural diagram of a filtering radiation unit according to an embodiment of the present application; FIG. 2 is a schematic diagram of a connection structure of a first microstrip and a second microstrip in the filtering radiation unit according to an embodiment of the present application; FIG. 3 is a schematic diagram of a structure with a part of the first microstrip omitted in the filtering radiation unit according to an embodiment of the present application; FIG. 4 is a diagram of an equivalent circuit of one filtering circuit in the filtering radiation unit according to an embodiment of the present application; FIG. 5 is a schematic diagram of another structure of a first line drawing in the filtering radiation unit according to an embodiment of the present application; FIG. 6 is a schematic diagram of yet another structure of a first line drawing in the filtering radiation unit according to an embodiment of the present application; FIG. 7 is a diagram illustrating comparison between performance of the filtering radiation unit according to an embodiment of the present application and a filtering radiation unit in the related technology; and FIG. 8 is a schematic diagram of an overall structure of the filtering radiation unit according to an embodiment of the present application. 100: filtering radiation unit; 10: radiation surface; 20: dipole arm; 30: substrate; 40: sub-branch; 50: filtering circuit; 60: filtering structure; 61: first microstrip; 611: first line drawing; 6111: main body portion; 6112: branch portion; 62: second microstrip; 621: hollow portion; 622: notch; 70: feed balun; 71: base; 80: auxiliary microstrip; 90: hollow groove; O: axis; Z: filtering structure group. DETAILED DESCRIPTION

[0018] To make the foregoing objectives, features, and advantages of the present application more comprehensible, specific implementations of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the meaning of the present application. Therefore, the present application is not limited to specific embodiments disclosed below.

[0019] In the description of the present application, it is to be understood that the orientation or position relationships indicated by the terms "central", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are based on the orientation or position relationships shown in the accompanying drawings, and are intended to facilitate the description of the present application and simplify the description only, rather than indicating or implying that the apparatus or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be interpreted as limitations to the present application.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only, which cannot be construed as indicating or implying a relative importance, or implicitly specifying the number of the indicated technical features. Therefore, the feature defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "multiple" means at least two, such as two or three, unless otherwise defined explicitly and specifically.

[0021] In the present application, unless otherwise specified and defined explicitly, the terms such as "mount", "connect", "communicate", and "fix" should be understood with a broad interpretation. For example, it may indicate a fixed connection, a detachable connection, or an integration; it may indicate a mechanical connection or an electrical connection; in addition, it may indicate a direct connection, an indirect connection via an intermediate medium, an internal connection between two elements, or interaction between two elements; unless it is otherwise explicitly defined. Those of ordinary skill in the art can understand specific meanings of these terms in the present application according to specific situations.

[0022] In the present application, unless otherwise specified and defined explicitly, the expression a first feature being "on" or "under" a second feature may be the first feature being in direct contact with the second feature, or the first feature being in indirect contact with the second feature via an intermediate medium. Furthermore, the expression the first feature being "over", "above" and "on top of" the second feature may be the first feature being directly above or obliquely above the second feature, or it only means that the level of the first feature is higher than that of the second feature. The expression the first feature being "below", "underneath" or "under" the second feature may be the first feature being directly underneath or obliquely underneath the second feature, or it only means that the level of the first feature is lower than that of the second feature.

[0023] It is to be noted that for one element referred to as being "fixed to" or "arranged on" another element, the element may be directly disposed on the another element, or an intermediate element may exist. For one element considered to be "connected to" another element, the element may be directly connected to the another element, or an intermediate element may further exist. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used herein are for illustrative purposes only, and they do not exclude other implementations.

[0024] FIG. 1 is a schematic structural diagram of a filtering radiation unit according to an embodiment of the present application. FIG. 2 is a schematic diagram of a connection structure of a first microstrip and a second microstrip in the filtering radiation unit according to an embodiment of the present application. FIG. 3 is a schematic diagram of a structure with a part of the first microstrip omitted in the filtering radiation unit according to an embodiment of the present application. FIG. 4 is an equivalent circuit diagram of a filtering circuit in the filtering radiation unit according to an embodiment of the present application. FIG. 7 is a diagram of comparison between performance of the filtering radiation unit according to embodiments of the present application and the filtering radiation unit in the related technology. FIG. 8 is a schematic diagram of an overall structure of the filtering radiation unit according to an embodiment of the present application.

[0025] A filtering radiation unit and an antenna array according to embodiments of the present application are described below with reference to the accompanying drawings. With the filtering radiation unit and the antenna array according to embodiments of the present application, the antenna gain may not be affected even if the material of the substrate varies.

[0026] Referring to FIG. 1, FIG. 2, FIG. 3, and FIG. 8, in a first aspect, a filtering radiation unit 100 is provided according to an embodiment of the present application. The filtering radiation unit 100 includes a radiation surface 10, a feed balun 70, and a base 71. The feed balun 70 is connected between the radiation surface 10 and the base 71. The feed balun 70 is configured to feed power to the radiation surface 10 and support the radiation surface 10.

[0027] The radiation surface 10 includes multiple dipole arms 20. The multiple dipole arms 20 are arranged in pairs. Each dipole arm 20 includes a substrate 30 and a filtering circuit 50 disposed on a surface of the substrate 30. For all the dipole arms 20, the filtering circuits 50 are located on a same side of the respective substrates 30. The filtering circuit 50 includes at least one filtering structure 60.

[0028] The filtering structure 60 includes a first microstrip 61 and a second microstrip 62. An end portion of the second microstrip 62 is provided with a hollow portion 621. A first line drawing 611 at an end portion of the first microstrip 61 is located within the hollow portion 621, and a preset gap exists between an outer contour of the first line drawing 611 and an inner contour of the hollow portion 621, so that the first line drawing 611 and the second microstrip 62 are coupled to each other to form a capacitor structure.

[0029] As the filtering structure 60 includes the first microstrip 61 and the second microstrip 62, a partial structure of the first microstrip 61 can function as an inductor in the filtering circuit 50. The end portion of the second microstrip 62 is provided with the hollow portion 621, the first line drawing 611 at the end portion of the first microstrip 61 is located within the hollow portion 621, and the preset gap exists between the outer contour of the first line drawing 611 and the inner contour of the hollow portion 621, so that the first line drawing 611 and the second microstrip 62 are coupled to each other to form the capacitor structure. Due to the preset gap between the first line drawing 611 and the hollow portion 621 of the second microstrip 62, which is filled with air, the capacitor structure is formed, functioning as a capacitor in the filtering circuit 50. Compared with a plate capacitor in the related technology, in the manner of forming capacitors by gap coupling, the filtering circuits 50 in all the dipole arms 20 are located on the same side of the respective substrates 30, and the substrates 30 basically may not participate in signal transmission attenuation processes of the capacitor structures. Hence, the variation of the material of the substrates 30 may not affect loss values of the capacitors, and the antenna gain may not be affected, either. Moreover, material selection for the substrates 30 may have less limitation, whcih can further reduce the cost of the antenna.

[0030] It is to be noted that the first microstrip 61 and the second microstrip 62 may be laid out flatly on a same surface of the corresponding substrate 30. For example, both are arranged on a surface of the substrate 30 away from the feed balun 70.

[0031] A total length of the preset gap may range from λ / 12 to λ / 8, where λ denotes a wavelength of an operating frequency band of the filtering radiation unit. The total length of the preset gap may be, for example, a total length of a projection of the preset gap onto the substrate 30. Such an arrangement can be more conducive to formation of a coupling capacitor.

[0032] The first microstrip 61 may be configured in a bent, meandering shape to have a longer length within a limited layout space. A portion of the first microstrip 61 outside the hollow portion 621 can be equivalent to the inductor in the filtering circuit 50, and a corresponding inductance value can be changed by changing a length and a winding manner of the first microstrip 61. A width of the second microstrip 62 may be greater than that of the first microstrip 61. By changing a coverage area of the first line drawing 611 of the first microstrip 61 on the substrate 30 and a dimension of the preset gap, a capacitance value can be changed. A filtering frequency band of the filtering circuit 50 can be changed through the change in the inductance value in combination with the change in the capacitance value.

[0033] The filtering circuit 50 may be located on a side of the substrate 30 away from the feed balun 70. In addition, the filtering radiation unit 100 according to an embodiment of the present application may be a low-frequency radiation unit.

[0034] In an embodiment of the present application, referring to FIG. 2 and FIG. 3, the hollow portion 621 includes at least one notch 622 in communication with an outer contour edge of the second microstrip 62. The first line drawing 611 is embedded from the notch 622 into the hollow portion 621.

[0035] In a practical implementation, one notch 622 may be provided. In this way, the first line drawing 611 and other portions of the first microstrip 61 can form a continuous circuit pattern.

[0036] In an embodiment of the present application, the first line drawing 611 includes a main body portion 6111 and multiple branch portions 6112 extending from the main body portion 6111 in a direction away from the main body portion 6111.

[0037] A shape of the inner contour of the hollow portion 621 matches a shape of the outer contour of the first line drawing 611.

[0038] The first line drawing 611 includes the main body portion 6111 and the branch portions 6112, so that the first line drawing 611 can have a relatively long path and a relatively maximized area. Moreover, the shape of the inner contour of the hollow portion 621 matches that of the outer contour of the first line drawing 611, so that the preset gap can be arranged more evenly at various positions along the outer contour of the first line drawing 611, which is conducive to the formation of the coupling capacitor. Specifically, the inner contour of the hollow portion 621 and the outer contour of the first line drawing 611 together define the preset gap, and a cross-sectional contour of the preset gap in an extension direction thereof remains unchanged. In this case, a total length of the preset gap along the extension direction thereof is: a value in the range from λ / 12 to λ / 8, where λ denotes a wavelength of an operating frequency band of the filtering radiation unit.

[0039] In an embodiment of the present application, a width of the first microstrip 61 is less than that of the second microstrip 62.

[0040] FIG. 5 is a schematic diagram of another structure of a first line drawing in the filtering radiation unit according to an embodiment of the present application, and FIG. 6 is a schematic diagram of yet another structure of a first line drawing in the filtering radiation unit according to an embodiment of the present application.

[0041] In an embodiment, multiple branch portions 6112 are provided, and the multiple branch portions 6112 are located on a same side of an extension direction of the main body portion 6111. Herein, for example, three branch portions 6112 may be provided. The three branch portions 6112 may be arranged, for example, perpendicular to the main body portion 6111, as shown in FIG. 1.

[0042] In some other embodiments, one branch portion 6112 is provided. The branch portion 6112 is located at an end portion of the main body portion 6111 in the extension direction, and forms a preset angle with the main body portion 6111. The angle may be 90 degrees. Alternatively, in some other embodiments, two branch portions 6112 may be provided, the two branch portions 6112 are located on one straight line, and the two branch portions 6112 are located at an end portion of the main body portion 6111 in the extension direction. Each of the two branch portions 6112 forms a preset angle with the main body portion 6111, for example, a right angle.

[0043] In a case where three branch portions 6112 are provided and the three branch portions 6112 are located on a same side of the extension direction of the main body portion 6111, the three branch portions 6112 may be perpendicular to the main body portion 6111. In this case, the first line drawing 611 is in an "E" shape. Certainly, the three branch portions 6112 may not be perpendicular to the main body portion 6111 but each form an acute angle with the main body portion 6111.

[0044] In a case where one branch portion 6112 is provided, and the branch portion 6112 is located at the end portion of the main body portion 6111 in the extension direction and forms a preset angle, for example, ninety degrees, with the main body portion 6111, the first line drawing 611 is in an "L" shape.

[0045] In a case where two branch portions 6112 are provided, the two branch portions 6112 are located on one straight line, and the two branch portions 6112 are located at the end portion of the main body portion 6111 in the extension direction and each form a preset angle, for example, ninety degrees, with the main body portion 6111, the first line drawing 611 is in a "T" shape.

[0046] Alternatively, with reference to FIG. 5, six branch portions 6112 may be provided, the six branch portions 6112 are arranged in pairs, and every two branch portions 6112 arranged in pairs are located on two sides of the main body portion 6111 respectively and are located on one straight line.

[0047] Alternatively, with reference to FIG. 6, two branch portions 6112 may be provided; and the two branch portions 6112, after extending from the main body portion 6111, are bent in a direction parallel to the main body portion 6111.

[0048] It may be understood that the number, layout position, and shape of the branch portion 6112 may alternatively be set according to an actual requirement, as long as the preset gap can be formed.

[0049] In an embodiment of the present application, referring to FIG. 1 and FIG. 4, at least two filtering structures 60 are provided, and the at least two filtering structures 60 are connected in series to form a sub-branch 40. The second microstrip 62 of the filtering structure 60 located at an outermost end portion of the sub-branch 40 is configured to be electrically connected to the feed balun 70.

[0050] The second microstrip 62 of the filtering structure 60 located at the outermost end portion of the sub-branch 40 serves as a feeding point.

[0051] Further, in two adjacent filtering structures 60 in a same sub-branch 40, one end of the first microstrip 61 of one filtering structure 60 away from the first line drawing 611 is connected to the second microstrip 62 of the other filtering structure 60. The connection herein refers to a direct structural connection to achieve an electrical connection. In this way, respective filtering structures 60 can be connected in series one after another.

[0052] In an embodiment of the present application, still referring to FIG. 1 and FIG. 4, the filtering circuit 50 includes an auxiliary microstrip 80. Each filtering circuit 50 includes at least two sub-branches 40. The first microstrip 61 in the filtering structure 60 at one end portion of each of the at least two sub-branches 40 is connected to the auxiliary microstrip 80, and the second microstrips 62 in the filtering structures 60 at the other end portions of the at least two sub-branches 40 are connected to each other.

[0053] In this way, two sub-branches 40 can be connected in parallel.

[0054] Referring to FIG. 4, which is the equivalent circuit diagram, the filtering structures 60 in each sub-branch 40 are connected in series, and the sub-branches 40 are then connected in parallel with each other.

[0055] It is to be noted that in the two branches connected in series, two filtering structures at corresponding positions may be classified into one functional unit to function. For example, the two filtering structures 60 located on the left side of FIG. 4 and in the two sub-branches 40 form one filtering structure group Z, the two filtering structures 60 located in the middle of FIG. 4 and in the two sub-branches 40 form another filtering structure group Z, and the two filtering structures 60 located on the right side of FIG. 4 and in the two sub-branches 40 form yet another filtering structure group Z.

[0056] In an embodiment of the present application, still referring to FIG. 1, four dipole arms 20 may be provided, and the four dipole arms 20 are orthogonally distributed along two mutually perpendicular axes O and have orthogonal polarizations. The substrates 30 of the four dipole arms 20 are coplanar with the two axes O. For example, the substrates 30 of the four dipole arms 20 may be formed integrally with each other, so that the four substrates 30 can be coplanar.

[0057] Each filtering circuit 50 includes two sub-branches 40, the corresponding substrate 30 is provided with a hollow groove 90, and the two sub-branches 40 are arranged around the hollow groove 90.

[0058] Patterns of the microstrips in the filtering structures 60 of the two sub-branches 40 are symmetrically arranged relative to an axis O passing through the substrate 30.

[0059] Certainly, the filtering circuits 50 on the respective dipole arms 20 are arranged central-symmetrically with respect to an intersection of the two axes O.

[0060] In order to verify performance of the filtering radiation unit in the embodiments of the present application, in the present application, gains of the filtering radiation unit in the related technology and the radiation unit in the embodiments of the present application within a preset frequency band range are also tested for comparison.

[0061] Referring to FIG. 7, across a current operating frequency band range of various major operators (approximately 0.7 GHz to 0.96 GHz, with a redundancy of 20 MHz), the gain of the filtering radiation unit in the embodiments of the present application is basically the same as that in the related technology in a frequency band range from 0.7 GHz to 0.74 GHz. Within a frequency band range from 0.74 GHz to 0.96 GHz, the gain of the filtering radiation unit in the embodiments of the present application is greater than that in the related technology, with a more obvious increase in the gain particularly within a frequency band range from 0.8 GHz to 0.96 GHz.

[0062] An antenna array is further provided according to an embodiment of the present application, including the foregoing filtering radiation unit 100. The function, structure, operating principle, and the like of the filtering radiation unit 100 have been described in detail above and are not repeated herein.

[0063] As the antenna array includes the foregoing filtering radiation unit 100 and the filtering structure 60 includes the first microstrip 61 and the second microstrip 62, a partial structure of the first microstrip 61 can function as an inductor in the filtering circuit 50. The end portion of the second microstrip 62 is provided with the hollow portion 621, the first line drawing 611 at the end portion of the first microstrip 61 is located within the hollow portion 621, and the preset gap exists between the outer contour of the first line drawing 611 and the inner contour of the hollow portion 621, so that the first line drawing 611 and the second microstrip 62 are coupled to each other to form the capacitor structure. Due to the preset gap between the first line drawing 611 and the hollow portion 621 of the second microstrip 62, which is filled with air, the capacitor structure is formed, functioning as a capacitor in the filtering circuit 50. Compared with a plate capacitor in the related technology, in the manner of forming capacitors by gap coupling, the filtering circuits 50 in all the dipole arms 20 are located on the same side of the respective substrates 30, and the substrates 30 basically may not participate in signal transmission attenuation processes of the capacitor structures. Hence, the variation of the material of the substrates 30 may not affect loss values of the capacitors, and the antenna gain may not be affected, either. Moreover, material selection for the substrates 30 may have less limitation, which can further reduce the cost of the antenna.

[0064] The filtering radiation unit and the antenna array according to the embodiments of the present application achieve the following beneficial effects.

[0065] As the filtering structure includes the first microstrip and the second microstrip, a partial structure of the first microstrip can function as an inductor in the filtering circuit. The end portion of the second microstrip is provided with the hollow portion, the first line drawing at the end portion of the first microstrip is located within the hollow portion, and the preset gap exists between the outer contour of the first line drawing and the inner contour of the hollow portion, so that the first line drawing and the second microstrip are coupled to each other to form the capacitor structure. Due to the preset gap between the first line drawing and the hollow portion of the second microstrip, which is filled with air, the capacitor structure is formed, functioning as a capacitor in the filtering circuit. Compared with the plate capacitor in the related technology, in the manner of forming the capacitors by gap coupling, the filtering circuits in all the dipole arms are located on the same side of the respective substrates, and the substrates basically may not participate in signal transmission attenuation processes of the capacitor structures. Hence, the variation of the material of the substrates may not affect loss values of the capacitors, and the antenna gain may not be affected, either. Moreover, material selection for the substrates 30 may have less limitation, which can further reduce the cost of the antenna.

[0066] The technical features in the above embodiments may be randomly combined. For concise description, not all possible combinations of the technical features in the above embodiments are described. However, all the combinations of the technical features are to be considered as falling within the scope described in this specification provided that they do not conflict with each other.

[0067] The above embodiments only describe several implementations of the present application, and the description thereof is specific and detailed, but cannot therefore be understood as a limitation on the patent scope of the present application. It should be noted that those of ordinary skill in the art may further make variations and improvements without departing from the conception of the present application, and these all fall within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Examples

Embodiment Construction

[0018]To make the foregoing objectives, features, and advantages of the present application more comprehensible, specific implementations of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the meaning of the present application. Therefore, the present application is not limited to specific embodiments disclosed below.

[0019]In the description of the present application, it is to be understood that the orientation or position relationships indicated by the terms "central", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizont...

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims priority to Chinese patent application No. 2024107521516, titled "FILTERING RADIATION UNIT AND ANTENNA ARRAY" and filed on June 12, 2024, the content of which is hereby incorporated by reference in its entirety.TECHNICAL FIELD

[0002] The present application relates to the technical field of antennas, and particularly, to a filtering radiation unit and an antenna array.BACKGROUND

[0003] In the related technology, radiation surfaces of filtering units are mostly designed with filtering function. Specifically, the radiation surface may include a substrate, and an LC filtering circuit arranged on the substrate. An inductor in the LC filtering circuit is arranged on a front surface or a back surface of the substrate, and a coupling capacitor in the LC filtering circuit is a plate capacitor distributed on the front surface and the back surface of the substrate. Generally, considering cost constraint, the substrate is preferred to be made of a material of relatively low cost, such as an FR4 laminate. However, the FR4 laminate has relatively high loss, and the capacitor may have relatively high loss consequently, which affects the antenna gain.SUMMARY

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

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

[0006] The filtering structure includes a first microstrip and a second microstrip, an end portion of the second microstrip is provided with a hollow portion, a first line drawing at an end portion of the first microstrip is located within the hollow portion, and a preset gap exists between an outer contour of the first line drawing and an inner contour of the hollow portion, so that the first line drawing and the second microstrip are coupled to each other to form a capacitor structure.

[0007] In some embodiments, the hollow portion includes at least one notch in communication with an outer contour edge of the second microstrip; and the first line drawing is embedded from the notch into the hollow portion.

[0008] In some embodiments, the first line drawing includes a main body portion and multiple branch portions extending from the main body portion in a direction away from the main body portion; a shape of the inner contour of the hollow portion matches that of the outer contour of the first line drawing.

[0009] In some embodiments, a width of the first microstrip is less than that of the second microstrip; multiple branch portions are provided, and the multiple branch portions are located on a same side an extension direction of the main body portion; or one branch portion is provided, and the branch portion is located at an end portion of the main body portion in the extension direction and forms a preset angle with the main body portion; or two branch portions are provided, the two branch portions are located on one straight line, and the two branch portions are located at an end portion of the main body portion in the extension direction and each forming a preset angle with the main body portion.

[0010] In some embodiments, a total length of the preset gap ranges from λ / 12 to λ / 8, where λ denotes a wavelength of an operating frequency band of the filtering radiation unit.

[0011] In some embodiments, at least two filtering structures are provided, the at least two filtering structures being connected in parallel to form a sub-branch; the second microstrip of the filtering structure located at an outermost end portion of the sub-branch is configured to be electrically connected to the feed balun.

[0012] In some embodiments, in two adjacent filtering structures in a same sub-branch, one end of the first microstrip of one filtering structure away from the first line drawing is connected to the second microstrip of the other filtering structure.

[0013] In some embodiments, the filtering circuit includes an auxiliary microstrip; each filtering circuit includes at least two sub-branches, the first microstrip in the filtering structure at one end portion of each sub-branch is connected to the auxiliary microstrip, and the second microstrips in the filtering structures at the other end portions of the at least two sub-branches are connected to each other.

[0014] In some embodiments, four dipole arms are provided, the four dipole arms are orthogonally distributed along two mutually perpendicular axes and have orthogonal polarizations, and the substrates of the four dipole arms are coplanar with the two axes; each filtering circuit includes two sub-branches, the corresponding substrate is provided with a hollow groove, and the two sub-branches are arranged around the hollow groove; and patterns of the microstrips in the filtering structures of the two sub-branches are symmetrically arranged relative to an axis passing through the substrate.

[0015] In a second aspect, the present application provides an antenna array, including the foregoing filtering radiation unit.

[0016] The above description is only a summary of the technical solutions of the present application, for understanding the technical means of the present application more clearly and implementing the present application according to the contents of the specification. Furthermore, to make the above and other objectives, features, and advantages of the present application more comprehensible, specific implementations of the present application are set forth as follows.BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits shall be apparent for those of ordinary skill in the art by reading detailed descriptions of the following implementations. The accompanying drawings are merely for illustrating the implementations, rather than for limiting the present application. Moreover, an identical reference numeral is used to indicate an identical member throughout the accompanying drawings. Among the accompanying drawings: FIG. 1 is a schematic structural diagram of a filtering radiation unit according to an embodiment of the present application; FIG. 2 is a schematic diagram of a connection structure of a first microstrip and a second microstrip in the filtering radiation unit according to an embodiment of the present application; FIG. 3 is a schematic diagram of a structure with a part of the first microstrip omitted in the filtering radiation unit according to an embodiment of the present application; FIG. 4 is a diagram of an equivalent circuit of one filtering circuit in the filtering radiation unit according to an embodiment of the present application; FIG. 5 is a schematic diagram of another structure of a first line drawing in the filtering radiation unit according to an embodiment of the present application; FIG. 6 is a schematic diagram of yet another structure of a first line drawing in the filtering radiation unit according to an embodiment of the present application; FIG. 7 is a diagram illustrating comparison between performance of the filtering radiation unit according to an embodiment of the present application and a filtering radiation unit in the related technology; and FIG. 8 is a schematic diagram of an overall structure of the filtering radiation unit according to an embodiment of the present application. 100: filtering radiation unit; 10: radiation surface; 20: dipole arm; 30: substrate; 40: sub-branch; 50: filtering circuit; 60: filtering structure; 61: first microstrip; 611: first line drawing; 6111: main body portion; 6112: branch portion; 62: second microstrip; 621: hollow portion; 622: notch; 70: feed balun; 71: base; 80: auxiliary microstrip; 90: hollow groove; O: axis; Z: filtering structure group. DETAILED DESCRIPTION

[0018] To make the foregoing objectives, features, and advantages of the present application more comprehensible, specific implementations of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the meaning of the present application. Therefore, the present application is not limited to specific embodiments disclosed below.

[0019] In the description of the present application, it is to be understood that the orientation or position relationships indicated by the terms "central", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are based on the orientation or position relationships shown in the accompanying drawings, and are intended to facilitate the description of the present application and simplify the description only, rather than indicating or implying that the apparatus or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be interpreted as limitations to the present application.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only, which cannot be construed as indicating or implying a relative importance, or implicitly specifying the number of the indicated technical features. Therefore, the feature defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "multiple" means at least two, such as two or three, unless otherwise defined explicitly and specifically.

[0021] In the present application, unless otherwise specified and defined explicitly, the terms such as "mount", "connect", "communicate", and "fix" should be understood with a broad interpretation. For example, it may indicate a fixed connection, a detachable connection, or an integration; it may indicate a mechanical connection or an electrical connection; in addition, it may indicate a direct connection, an indirect connection via an intermediate medium, an internal connection between two elements, or interaction between two elements; unless it is otherwise explicitly defined. Those of ordinary skill in the art can understand specific meanings of these terms in the present application according to specific situations.

[0022] In the present application, unless otherwise specified and defined explicitly, the expression a first feature being "on" or "under" a second feature may be the first feature being in direct contact with the second feature, or the first feature being in indirect contact with the second feature via an intermediate medium. Furthermore, the expression the first feature being "over", "above" and "on top of" the second feature may be the first feature being directly above or obliquely above the second feature, or it only means that the level of the first feature is higher than that of the second feature. The expression the first feature being "below", "underneath" or "under" the second feature may be the first feature being directly underneath or obliquely underneath the second feature, or it only means that the level of the first feature is lower than that of the second feature.

[0023] It is to be noted that for one element referred to as being "fixed to" or "arranged on" another element, the element may be directly disposed on the another element, or an intermediate element may exist. For one element considered to be "connected to" another element, the element may be directly connected to the another element, or an intermediate element may further exist. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used herein are for illustrative purposes only, and they do not exclude other implementations.

[0024] FIG. 1 is a schematic structural diagram of a filtering radiation unit according to an embodiment of the present application. FIG. 2 is a schematic diagram of a connection structure of a first microstrip and a second microstrip in the filtering radiation unit according to an embodiment of the present application. FIG. 3 is a schematic diagram of a structure with a part of the first microstrip omitted in the filtering radiation unit according to an embodiment of the present application. FIG. 4 is an equivalent circuit diagram of a filtering circuit in the filtering radiation unit according to an embodiment of the present application. FIG. 7 is a diagram of comparison between performance of the filtering radiation unit according to embodiments of the present application and the filtering radiation unit in the related technology. FIG. 8 is a schematic diagram of an overall structure of the filtering radiation unit according to an embodiment of the present application.

[0025] A filtering radiation unit and an antenna array according to embodiments of the present application are described below with reference to the accompanying drawings. With the filtering radiation unit and the antenna array according to embodiments of the present application, the antenna gain may not be affected even if the material of the substrate varies.

[0026] Referring to FIG. 1, FIG. 2, FIG. 3, and FIG. 8, in a first aspect, a filtering radiation unit 100 is provided according to an embodiment of the present application. The filtering radiation unit 100 includes a radiation surface 10, a feed balun 70, and a base 71. The feed balun 70 is connected between the radiation surface 10 and the base 71. The feed balun 70 is configured to feed power to the radiation surface 10 and support the radiation surface 10.

[0027] The radiation surface 10 includes multiple dipole arms 20. The multiple dipole arms 20 are arranged in pairs. Each dipole arm 20 includes a substrate 30 and a filtering circuit 50 disposed on a surface of the substrate 30. For all the dipole arms 20, the filtering circuits 50 are located on a same side of the respective substrates 30. The filtering circuit 50 includes at least one filtering structure 60.

[0028] The filtering structure 60 includes a first microstrip 61 and a second microstrip 62. An end portion of the second microstrip 62 is provided with a hollow portion 621. A first line drawing 611 at an end portion of the first microstrip 61 is located within the hollow portion 621, and a preset gap exists between an outer contour of the first line drawing 611 and an inner contour of the hollow portion 621, so that the first line drawing 611 and the second microstrip 62 are coupled to each other to form a capacitor structure.

[0029] As the filtering structure 60 includes the first microstrip 61 and the second microstrip 62, a partial structure of the first microstrip 61 can function as an inductor in the filtering circuit 50. The end portion of the second microstrip 62 is provided with the hollow portion 621, the first line drawing 611 at the end portion of the first microstrip 61 is located within the hollow portion 621, and the preset gap exists between the outer contour of the first line drawing 611 and the inner contour of the hollow portion 621, so that the first line drawing 611 and the second microstrip 62 are coupled to each other to form the capacitor structure. Due to the preset gap between the first line drawing 611 and the hollow portion 621 of the second microstrip 62, which is filled with air, the capacitor structure is formed, functioning as a capacitor in the filtering circuit 50. Compared with a plate capacitor in the related technology, in the manner of forming capacitors by gap coupling, the filtering circuits 50 in all the dipole arms 20 are located on the same side of the respective substrates 30, and the substrates 30 basically may not participate in signal transmission attenuation processes of the capacitor structures. Hence, the variation of the material of the substrates 30 may not affect loss values of the capacitors, and the antenna gain may not be affected, either. Moreover, material selection for the substrates 30 may have less limitation, whcih can further reduce the cost of the antenna.

[0030] It is to be noted that the first microstrip 61 and the second microstrip 62 may be laid out flatly on a same surface of the corresponding substrate 30. For example, both are arranged on a surface of the substrate 30 away from the feed balun 70.

[0031] A total length of the preset gap may range from λ / 12 to λ / 8, where λ denotes a wavelength of an operating frequency band of the filtering radiation unit. The total length of the preset gap may be, for example, a total length of a projection of the preset gap onto the substrate 30. Such an arrangement can be more conducive to formation of a coupling capacitor.

[0032] The first microstrip 61 may be configured in a bent, meandering shape to have a longer length within a limited layout space. A portion of the first microstrip 61 outside the hollow portion 621 can be equivalent to the inductor in the filtering circuit 50, and a corresponding inductance value can be changed by changing a length and a winding manner of the first microstrip 61. A width of the second microstrip 62 may be greater than that of the first microstrip 61. By changing a coverage area of the first line drawing 611 of the first microstrip 61 on the substrate 30 and a dimension of the preset gap, a capacitance value can be changed. A filtering frequency band of the filtering circuit 50 can be changed through the change in the inductance value in combination with the change in the capacitance value.

[0033] The filtering circuit 50 may be located on a side of the substrate 30 away from the feed balun 70. In addition, the filtering radiation unit 100 according to an embodiment of the present application may be a low-frequency radiation unit.

[0034] In an embodiment of the present application, referring to FIG. 2 and FIG. 3, the hollow portion 621 includes at least one notch 622 in communication with an outer contour edge of the second microstrip 62. The first line drawing 611 is embedded from the notch 622 into the hollow portion 621.

[0035] In a practical implementation, one notch 622 may be provided. In this way, the first line drawing 611 and other portions of the first microstrip 61 can form a continuous circuit pattern.

[0036] In an embodiment of the present application, the first line drawing 611 includes a main body portion 6111 and multiple branch portions 6112 extending from the main body portion 6111 in a direction away from the main body portion 6111.

[0037] A shape of the inner contour of the hollow portion 621 matches a shape of the outer contour of the first line drawing 611.

[0038] The first line drawing 611 includes the main body portion 6111 and the branch portions 6112, so that the first line drawing 611 can have a relatively long path and a relatively maximized area. Moreover, the shape of the inner contour of the hollow portion 621 matches that of the outer contour of the first line drawing 611, so that the preset gap can be arranged more evenly at various positions along the outer contour of the first line drawing 611, which is conducive to the formation of the coupling capacitor. Specifically, the inner contour of the hollow portion 621 and the outer contour of the first line drawing 611 together define the preset gap, and a cross-sectional contour of the preset gap in an extension direction thereof remains unchanged. In this case, a total length of the preset gap along the extension direction thereof is: a value in the range from λ / 12 to λ / 8, where λ denotes a wavelength of an operating frequency band of the filtering radiation unit.

[0039] In an embodiment of the present application, a width of the first microstrip 61 is less than that of the second microstrip 62.

[0040] FIG. 5 is a schematic diagram of another structure of a first line drawing in the filtering radiation unit according to an embodiment of the present application, and FIG. 6 is a schematic diagram of yet another structure of a first line drawing in the filtering radiation unit according to an embodiment of the present application.

[0041] In an embodiment, multiple branch portions 6112 are provided, and the multiple branch portions 6112 are located on a same side of an extension direction of the main body portion 6111. Herein, for example, three branch portions 6112 may be provided. The three branch portions 6112 may be arranged, for example, perpendicular to the main body portion 6111, as shown in FIG. 1.

[0042] In some other embodiments, one branch portion 6112 is provided. The branch portion 6112 is located at an end portion of the main body portion 6111 in the extension direction, and forms a preset angle with the main body portion 6111. The angle may be 90 degrees. Alternatively, in some other embodiments, two branch portions 6112 may be provided, the two branch portions 6112 are located on one straight line, and the two branch portions 6112 are located at an end portion of the main body portion 6111 in the extension direction. Each of the two branch portions 6112 forms a preset angle with the main body portion 6111, for example, a right angle.

[0043] In a case where three branch portions 6112 are provided and the three branch portions 6112 are located on a same side of the extension direction of the main body portion 6111, the three branch portions 6112 may be perpendicular to the main body portion 6111. In this case, the first line drawing 611 is in an "E" shape. Certainly, the three branch portions 6112 may not be perpendicular to the main body portion 6111 but each form an acute angle with the main body portion 6111.

[0044] In a case where one branch portion 6112 is provided, and the branch portion 6112 is located at the end portion of the main body portion 6111 in the extension direction and forms a preset angle, for example, ninety degrees, with the main body portion 6111, the first line drawing 611 is in an "L" shape.

[0045] In a case where two branch portions 6112 are provided, the two branch portions 6112 are located on one straight line, and the two branch portions 6112 are located at the end portion of the main body portion 6111 in the extension direction and each form a preset angle, for example, ninety degrees, with the main body portion 6111, the first line drawing 611 is in a "T" shape.

[0046] Alternatively, with reference to FIG. 5, six branch portions 6112 may be provided, the six branch portions 6112 are arranged in pairs, and every two branch portions 6112 arranged in pairs are located on two sides of the main body portion 6111 respectively and are located on one straight line.

[0047] Alternatively, with reference to FIG. 6, two branch portions 6112 may be provided; and the two branch portions 6112, after extending from the main body portion 6111, are bent in a direction parallel to the main body portion 6111.

[0048] It may be understood that the number, layout position, and shape of the branch portion 6112 may alternatively be set according to an actual requirement, as long as the preset gap can be formed.

[0049] In an embodiment of the present application, referring to FIG. 1 and FIG. 4, at least two filtering structures 60 are provided, and the at least two filtering structures 60 are connected in series to form a sub-branch 40. The second microstrip 62 of the filtering structure 60 located at an outermost end portion of the sub-branch 40 is configured to be electrically connected to the feed balun 70.

[0050] The second microstrip 62 of the filtering structure 60 located at the outermost end portion of the sub-branch 40 serves as a feeding point.

[0051] Further, in two adjacent filtering structures 60 in a same sub-branch 40, one end of the first microstrip 61 of one filtering structure 60 away from the first line drawing 611 is connected to the second microstrip 62 of the other filtering structure 60. The connection herein refers to a direct structural connection to achieve an electrical connection. In this way, respective filtering structures 60 can be connected in series one after another.

[0052] In an embodiment of the present application, still referring to FIG. 1 and FIG. 4, the filtering circuit 50 includes an auxiliary microstrip 80. Each filtering circuit 50 includes at least two sub-branches 40. The first microstrip 61 in the filtering structure 60 at one end portion of each of the at least two sub-branches 40 is connected to the auxiliary microstrip 80, and the second microstrips 62 in the filtering structures 60 at the other end portions of the at least two sub-branches 40 are connected to each other.

[0053] In this way, two sub-branches 40 can be connected in parallel.

[0054] Referring to FIG. 4, which is the equivalent circuit diagram, the filtering structures 60 in each sub-branch 40 are connected in series, and the sub-branches 40 are then connected in parallel with each other.

[0055] It is to be noted that in the two branches connected in series, two filtering structures at corresponding positions may be classified into one functional unit to function. For example, the two filtering structures 60 located on the left side of FIG. 4 and in the two sub-branches 40 form one filtering structure group Z, the two filtering structures 60 located in the middle of FIG. 4 and in the two sub-branches 40 form another filtering structure group Z, and the two filtering structures 60 located on the right side of FIG. 4 and in the two sub-branches 40 form yet another filtering structure group Z.

[0056] In an embodiment of the present application, still referring to FIG. 1, four dipole arms 20 may be provided, and the four dipole arms 20 are orthogonally distributed along two mutually perpendicular axes O and have orthogonal polarizations. The substrates 30 of the four dipole arms 20 are coplanar with the two axes O. For example, the substrates 30 of the four dipole arms 20 may be formed integrally with each other, so that the four substrates 30 can be coplanar.

[0057] Each filtering circuit 50 includes two sub-branches 40, the corresponding substrate 30 is provided with a hollow groove 90, and the two sub-branches 40 are arranged around the hollow groove 90.

[0058] Patterns of the microstrips in the filtering structures 60 of the two sub-branches 40 are symmetrically arranged relative to an axis O passing through the substrate 30.

[0059] Certainly, the filtering circuits 50 on the respective dipole arms 20 are arranged central-symmetrically with respect to an intersection of the two axes O.

[0060] In order to verify performance of the filtering radiation unit in the embodiments of the present application, in the present application, gains of the filtering radiation unit in the related technology and the radiation unit in the embodiments of the present application within a preset frequency band range are also tested for comparison.

[0061] Referring to FIG. 7, across a current operating frequency band range of various major operators (approximately 0.7 GHz to 0.96 GHz, with a redundancy of 20 MHz), the gain of the filtering radiation unit in the embodiments of the present application is basically the same as that in the related technology in a frequency band range from 0.7 GHz to 0.74 GHz. Within a frequency band range from 0.74 GHz to 0.96 GHz, the gain of the filtering radiation unit in the embodiments of the present application is greater than that in the related technology, with a more obvious increase in the gain particularly within a frequency band range from 0.8 GHz to 0.96 GHz.

[0062] An antenna array is further provided according to an embodiment of the present application, including the foregoing filtering radiation unit 100. The function, structure, operating principle, and the like of the filtering radiation unit 100 have been described in detail above and are not repeated herein.

[0063] As the antenna array includes the foregoing filtering radiation unit 100 and the filtering structure 60 includes the first microstrip 61 and the second microstrip 62, a partial structure of the first microstrip 61 can function as an inductor in the filtering circuit 50. The end portion of the second microstrip 62 is provided with the hollow portion 621, the first line drawing 611 at the end portion of the first microstrip 61 is located within the hollow portion 621, and the preset gap exists between the outer contour of the first line drawing 611 and the inner contour of the hollow portion 621, so that the first line drawing 611 and the second microstrip 62 are coupled to each other to form the capacitor structure. Due to the preset gap between the first line drawing 611 and the hollow portion 621 of the second microstrip 62, which is filled with air, the capacitor structure is formed, functioning as a capacitor in the filtering circuit 50. Compared with a plate capacitor in the related technology, in the manner of forming capacitors by gap coupling, the filtering circuits 50 in all the dipole arms 20 are located on the same side of the respective substrates 30, and the substrates 30 basically may not participate in signal transmission attenuation processes of the capacitor structures. Hence, the variation of the material of the substrates 30 may not affect loss values of the capacitors, and the antenna gain may not be affected, either. Moreover, material selection for the substrates 30 may have less limitation, which can further reduce the cost of the antenna.

[0064] The filtering radiation unit and the antenna array according to the embodiments of the present application achieve the following beneficial effects.

[0065] As the filtering structure includes the first microstrip and the second microstrip, a partial structure of the first microstrip can function as an inductor in the filtering circuit. The end portion of the second microstrip is provided with the hollow portion, the first line drawing at the end portion of the first microstrip is located within the hollow portion, and the preset gap exists between the outer contour of the first line drawing and the inner contour of the hollow portion, so that the first line drawing and the second microstrip are coupled to each other to form the capacitor structure. Due to the preset gap between the first line drawing and the hollow portion of the second microstrip, which is filled with air, the capacitor structure is formed, functioning as a capacitor in the filtering circuit. Compared with the plate capacitor in the related technology, in the manner of forming the capacitors by gap coupling, the filtering circuits in all the dipole arms are located on the same side of the respective substrates, and the substrates basically may not participate in signal transmission attenuation processes of the capacitor structures. Hence, the variation of the material of the substrates may not affect loss values of the capacitors, and the antenna gain may not be affected, either. Moreover, material selection for the substrates 30 may have less limitation, which can further reduce the cost of the antenna.

[0066] The technical features in the above embodiments may be randomly combined. For concise description, not all possible combinations of the technical features in the above embodiments are described. However, all the combinations of the technical features are to be considered as falling within the scope described in this specification provided that they do not conflict with each other.

[0067] The above embodiments only describe several implementations of the present application, and the description thereof is specific and detailed, but cannot therefore be understood as a limitation on the patent scope of the present application. It should be noted that those of ordinary skill in the art may further make variations and improvements without departing from the conception of the present application, and these all fall within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Examples

Embodiment Construction

[0018]To make the foregoing objectives, features, and advantages of the present application more comprehensible, specific implementations of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the meaning of the present application. Therefore, the present application is not limited to specific embodiments disclosed below.

[0019]In the description of the present application, it is to be understood that the orientation or position relationships indicated by the terms "central", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizont...

Claims

1. A filtering radiation unit, characterized by comprising: a radiation surface, a feed balun, and a base, the feed balun being connected between the radiation surface and the base; wherein the radiation surface comprises a plurality of dipole arms, the plurality of dipole arms being arranged in pairs, each of the dipole arms comprises a substrate and a filtering circuit disposed on a surface of the substrate, the filtering circuits in all of the dipole arms are located on a same side of the substrates corresponding to the filtering circuits, and the filtering circuit comprises at least one filtering structure; wherein the filtering structure comprises a first microstrip and a second microstrip, an end portion of the second microstrip is provided with a hollow portion, a first line drawing at an end portion of the first microstrip is located within the hollow portion, and a preset gap exists between an outer contour of the first line drawing and an inner contour of the hollow portion to enable the first line drawing and the second microstrip to be coupled to each other to form a capacitor structure.

2. The filtering radiation unit according to claim 1, wherein the hollow portion comprises at least one notch in communication with an outer contour edge of the second microstrip, and the first line drawing is embedded from the notch into the hollow portion.

3. The filtering radiation unit according to claim 2, wherein the first line drawing comprises a main body portion and a plurality of branch portions extending from the main body portion in a direction away from the main body portion, and a shape of the inner contour of the hollow portion matches a shape of the outer contour of the first line drawing.

4. The filtering radiation unit according to claim 3, wherein a width of the first microstrip is less than a width of the second microstrip; wherein the number of the branch portion is plural, the plurality of branch portions being located on a same side of an extension direction of the main body portion; or the number of the branch portion is one, the one branch portion being located at an end portion of the main body portion in the extension direction and forming a preset angle with the main body portion; or the number of the branch portion is two, the two branch portions being located on one straight line, and the two branch portions being located at an end portion of the main body portion in the extension direction and each forming a preset angle with the main body portion.

5. The filtering radiation unit according to claim 3, wherein a total length of the preset gap ranges from λ / 12 to λ / 8, λ denoting a wavelength of an operating frequency band of the filtering radiation unit.

6. The filtering radiation unit according to any one of claims 1 to 5, wherein at least two filtering structures are provided, the at least two filtering structures being connected in parallel to form a sub-branch, and the second microstrip of the filtering structure located at an outermost end portion of the sub-branch is configured to be electrically connected to the feed balun.

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

8. The filtering radiation unit according to claim 7, wherein the filtering circuit comprises an auxiliary microstrip; and each filtering circuit comprises at least two sub-branches, the first microstrip in the filtering structure at one end portion of each of the at least two sub-branches is connected to the auxiliary microstrip, and the second microstrips in the filtering structures at the other end portions of the at least two sub-branches are connected to each other.

9. The filtering radiation unit according to claim 7, wherein the number of the plurality of dipole arms is four, the four dipole arms being orthogonally distributed along two mutually perpendicular axes and having orthogonal polarizations, and the substrates of the four dipole arms are coplanar with the two axes; and wherein patterns of the microstrips in the filtering structures of the two sub-branches are symmetrically arranged relative to an axis passing through the substrate.

10. An antenna array, characterized by comprising the filtering radiation unit according to any one of claims 1 to 9.

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