Low-frequency filtering radiating element and base station antenna

Abstract

The present application provides a low-frequency filtering radiating element and a base station antenna, where the low-frequency filtering radiating element includes: a substrate, which includes a first mounting surface and a second mounting surface arranged opposite; and a low-frequency radiating element, which includes four pairs of dipoles distributed on the substrate centrosymmetrically, where the four pairs of dipoles are distributed in orthogonal polarization to form two groups of ±45° polarized radiating elements, each pair of dipoles includes two radiation arms arranged on the first mounting surface and the second mounting surface respectively, and the two radiation arms are arranged in a mirror mode.

Description

FIELD

[0001] The present application relates to the field of communication equipment, and in particular to a low-frequency filtering radiating element and a base station antenna.BACKGROUND

[0002] A radiating element is a main part of an antenna and can transmit and receive electromagnetic waves directionally to realize wireless communication. A dual-polarized radiating element can realize polarity diversity, and can work in a transceiver duplex mode, which greatly reduces a number of antennas and occupation space. The integration of a multi-band antenna in the industry is getting higher, and radiating elements with different frequency bands need to be arranged in a limited space. Traditional high-frequency and low-frequency integration schemes include a low-frequency bowl-shaped nested scheme and a crossed radiating element scheme. Although the low-frequency bowl-shaped nested scheme has a better performance, it has a fixed formation of the arrays, and although the crossed radiating element scheme has a flexible formation of the arrays, it has a poor index. Therefore, it is an urgent problem for those skilled in the art to design a low-frequency radiating element with simple structure, excellent performance and little influence on high frequencies.

[0003] CN112864604A discloses a radiation element for an antenna including a first pair of dipoles. The first pair of dipoles includes a first dipole and a second dipole, where the first dipole has a first radiation arm and a second radiation arm, and the second dipole has a third radiation arm and a fourth radiation arm. A first connection trace between the first radiation arm of the first dipole and the third radiation arm of the second dipole and a second connection trace between the second radiation arm of the first dipole and the fourth radiation arm of the second dipole are parallel to each other. The radiation arms of the first pair of dipoles are planar structures.

[0004] CN110649396A discloses a communication device comprises a first antenna assembly, a second antenna assembly, and a metal dividing surface. The first antenna assembly includes four antenna elements. The second antenna assembly includes eight antenna elements. Two antenna elements of the first antenna assembly and four antenna elements of the second antenna assembly have a first polarization direction. Two other antenna elements of the first antenna assembly and four other antenna elements of the second antenna assembly have a second polarization direction. The second polarization direction is different from the first polarization direction.

[0005] EP 3886255A1 discloses an antenna including a balun structure, a radiation structure disposed on the balun structure, and a coupling structure disposed on the radiation structure.

[0006] WO2022012023A1 discloses a low-frequency radiation unit, including a dielectric substrate, a radiator and a feeding balun, the radiator containing two orthogonally distributed dipoles, radiation arms of the two dipoles being respectively formed by a vertical line and a horizontal line and forming a cross-shaped line together, tail ends of the vertical line and the horizontal line being connected by means of a circular arc line, and a plurality of bent lines being provided in the middle of the circular arc line; and the feeding balun being of an orthogonal structure, the bottom of the feeding balun being connected to a feeding network, and the top of the feeding balun being connected to the radiator.SUMMARY

[0007] The invention is set out in the appended set of claims.BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to clearly illustrate the solutions of the embodiments according to the present application, the accompanying drawings used in the description of the embodiments are briefly introduced below. FIG. 1 is a three-dimensional schematic structural diagram of a low-frequency filtering radiating element according to an embodiment of the present application; FIG. 2 is a schematic structural diagram of a front side of a substrate in FIG. 1; FIG. 3 is a schematic structural diagram of a rear side of the substrate in FIG. 1; FIG. 4 is a three-dimensional schematic structural diagram of a base station antenna according to an embodiment of the present application; reference numerals:

[0009] 10: base station antenna; 100: low-frequency filtering radiating element; 110: substrate; 111: first mounting surface; 112: second mounting surface; 120: low-frequency radiating element; 121: dipole arm; 122: radiation arm; 123: filtering member; 124: inductive stub; 130: fed element; 131: feeder balun; 132: filtering stub; 140: support seat; 141: feeder substrate; 142: base; 200: pedestal; 300: high-frequency radiating element.DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] In the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and so on are based on the orientations or positional relationships shown in the drawings, which are only for convenience and simplifying of describing the embodiments of the present application, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, or be construct or operate in a specific orientation, and therefore should not be construed as limits of the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purpose only, and should not be construed as indicating or implying relative importance.

[0011] In the embodiments of the present application, it should be noted that unless otherwise specified and limited, the terms "connected" and "joined" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or integrated connection; it can be mechanical connection or electrical connection; or it can be direct connection or indirect connection through an intermediary. Those of ordinary skill in the art may understand the specific meanings of the above terms in the embodiments of the present application in specific situations.

[0012] In the embodiments of the present application, unless otherwise specified and limited, a first feature being "above" or "below" a second feature may mean that the first feature and the second feature are in direct contact, or the first feature and the second feature are in indirect contact through an intermediary. Moreover, the first feature being "above", "upward" or "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or only mean that a horizontal height of the first feature is higher than a horizontal height of the second feature. The first feature being "below", "downward" or "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or only mean that a horizontal height of the first feature is lower than a horizontal height of the second feature.

[0013] In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and so on mean that specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in suitable manners in any one or multiple embodiments or examples. In addition, those skilled in the art may combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

[0014] A low-frequency filtering radiating element 100 and a base station antenna 10 according to the present application are described below with reference to FIG. 1 to FIG. 4.

[0015] In a traditional multi-band integrated antenna, a low-frequency radiating element is relatively large in size compared to a high-frequency radiating element, which always deteriorates high-frequency indicators in multi-band integrated systems. The present application provides a low-frequency filtering radiating element 100, including: a substrate 110, which includes a first mounting surface 111 and a second mounting surface 112 arranged opposite; a low-frequency radiating element 120, which includes four pairs of dipole arms 121 distributed on the substrate 110 centrosymmetrically, where the four pairs of dipole arms 121 are distributed in orthogonal polarization to form two groups of ±45° polarized radiating elements, each pair of dipole arms 121 includes two radiation arms 122 arranged on the first mounting surface 111 and the second mounting surface 112 respectively, and the two radiation arms 122 are arranged in a mirror mode.

[0016] The low-frequency filtering radiating element 100 constitutes a fundamental structure of an antenna, and can effectively radiate or receive radio waves. The low-frequency filtering radiating element 100 may be made of materials as required, such as a printed circuit board (PCB) or a metal die-cast plate. In an example, the substrate 110 is the PCB or the metal die-cast plate correspondingly. A dielectric thickness, a dielectric constant and related parameters of the substrate 110 may be set according to actual requirements, for example, a range of the dielectric thickness of the substrate 110 is 0.2 mm to 3 mm, and a range of the dielectric constant is 2 to 10.

[0017] The low-frequency filtering radiating element 100 according to the present application, includes two groups of ±45° polarized radiating elements, where the radiating element consisted of two dipole arms 121 not only has better element radiation performance than a common single dipole arm 121 crossed antenna, array performance is also more stable; and compared to a bowl-shaped radiating element, the low-frequency filtering radiating element 100 according to the present application has higher integration, smaller installation area, more flexible array and may significantly improve the applicability of the radiating element.

[0018] In an embodiment, each of the first mounting surface 111 and the second mounting surface 112 is provided with a fed element 130 respectively, the fed element 130 includes four orthogonally distributed feeder baluns 131, and each of the feeder baluns 131 is connected to a corresponding radiation arm 122, two feeder baluns 131 on a same extension line in a direction of ±45° in each fed element 130 are cascaded at the center of the substrate 110 to make the two dipole arms 121 on the same extension line in a direction of ±45° form a ±45° polarized radiating element. Further, each of the feeder baluns 131 is provided with at least one filtering stub 132, and the filtering stub 132 is used to reduce the affect of the low-frequency radiating element 120 on the high-frequency radiating element. It should be noted that the number and shape of the filtering stubs 132 may be set according to actual requirements, for example, the filtering stubs 132 may be set as the same or different shapes, different lengths and different widths, and the filtering stubs 132 may be linear, curved or L-shaped, which is not specifically limited in this embodiment. In this embodiment, the filtering stubs 132 form multiple filtering stub groups, the multiple filtering stub groups are sequentially distributed at intervals along the length direction of the corresponding feeder balun 131, and two filtering stubs 132 of each filtering stub group are symmetrically distributed on both sides at intervals along the length direction of the corresponding feeder balun 131, and the filtering stubs 132 are L-shaped.

[0019] In the related art, decoupling between radiating elements of different frequency bands is mainly achieved in the feeder network, by the form of circuits, and by filter manners such as adding isolation strips, barriers, elements or PCBs between radiating elements of different frequency bands, to reduce a coupling between the radiating elements of different frequency bands as much as possible. However, this manner needs to add a large number of filtering elements between the radiating elements, which occupies a lot of space, results in a small space occupation of the radiating elements on the antenna, affects the overall layout of the radiating elements on the antenna, and makes it harder for the antenna as a whole to meet the requirement of the number of frequency bands, or the effect of eliminating interference cannot meet the expected requirements. In the present application, in an embodiment, each radiation arm 122 includes multiple filtering members 123 and inductive stubs 124 connected to the filtering members 123. By adding filtering members 123 in the radiation arm 122, filtering effect is achieved, which causes the radiation arm 122 to have a certain filtering effect on interference from other frequency bands, to avoid changing the arrangement of the radiation arms 122 on the antenna and occupying extra space of the antenna.

[0020] It should be noted that the number and shape of the filtering member 123 of each radiation arm 122 may be set according to actual requirement, for example, the filtering members 123 may be set as the same or different shapes, different lengths and different widths, and the filtering members 123 are connected by inductive stubs 124, which is not specifically limited in this embodiment. In this embodiment, the radiation arm 122 is configured as rectangular in shape, the filtering member 123 is correspondingly configured as rectangular in shape and the inductive stub 124 is configured as strip in shape and used for connecting the filtering members 123.

[0021] In an embodiment, the low-frequency filtering radiating element 100 also includes a support seat 140, which includes a base 142 and two feeder substrates 141 located on the base 142. The two feeder substrates 141 are orthogonally distributed and connected to the fed element 130 on the second mounting surface 112, and are used to feed the feeder baluns 131. The feeder substrate 141 may be PCB or metal die-cast plates, which is not limited in the present application. In an embodiment, a feeder circuit is provided inside the feeder balun 131, and the feeder circuit is used to feed a corresponding radiation arm 122 through a coaxial line and / or a feeder pad.

[0022] Based on the aforementioned low-frequency filtering radiating element 100, the present application also provides a base station antenna 10, including: a pedestal 200; multiple high-frequency radiating elements 300, which are located on the pedestal 200; and low-frequency filtering radiating elements 100, which are distributed at intervals between the high-frequency radiating elements 300. The spacing of the high-frequency radiating elements is 0.7 λ~0.9 λ. λ is a wavelength of a center frequency point of a high-frequency radiating element. Since the main improvement of the present application is in the low-frequency filtering radiating element 100, the detailed structure of the base station antenna 10 is not further described.

Examples

Embodiment Construction

[0010]In the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and so on are based on the orientations or positional relationships shown in the drawings, which are only for convenience and simplifying of describing the embodiments of the present application, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, or be construct or operate in a specific orientation, and therefore should not be construed as limits of the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purpose only, and should not be construed as indicating or implying relative importance.

[0011]In the embodiments of the present application, it should be noted that unless oth...

FIELD

[0001] The present application relates to the field of communication equipment, and in particular to a low-frequency filtering radiating element and a base station antenna.BACKGROUND

[0002] A radiating element is a main part of an antenna and can transmit and receive electromagnetic waves directionally to realize wireless communication. A dual-polarized radiating element can realize polarity diversity, and can work in a transceiver duplex mode, which greatly reduces a number of antennas and occupation space. The integration of a multi-band antenna in the industry is getting higher, and radiating elements with different frequency bands need to be arranged in a limited space. Traditional high-frequency and low-frequency integration schemes include a low-frequency bowl-shaped nested scheme and a crossed radiating element scheme. Although the low-frequency bowl-shaped nested scheme has a better performance, it has a fixed formation of the arrays, and although the crossed radiating element scheme has a flexible formation of the arrays, it has a poor index. Therefore, it is an urgent problem for those skilled in the art to design a low-frequency radiating element with simple structure, excellent performance and little influence on high frequencies.

[0003] CN112864604A discloses a radiation element for an antenna including a first pair of dipoles. The first pair of dipoles includes a first dipole and a second dipole, where the first dipole has a first radiation arm and a second radiation arm, and the second dipole has a third radiation arm and a fourth radiation arm. A first connection trace between the first radiation arm of the first dipole and the third radiation arm of the second dipole and a second connection trace between the second radiation arm of the first dipole and the fourth radiation arm of the second dipole are parallel to each other. The radiation arms of the first pair of dipoles are planar structures.

[0004] CN110649396A discloses a communication device comprises a first antenna assembly, a second antenna assembly, and a metal dividing surface. The first antenna assembly includes four antenna elements. The second antenna assembly includes eight antenna elements. Two antenna elements of the first antenna assembly and four antenna elements of the second antenna assembly have a first polarization direction. Two other antenna elements of the first antenna assembly and four other antenna elements of the second antenna assembly have a second polarization direction. The second polarization direction is different from the first polarization direction.

[0005] EP 3886255A1 discloses an antenna including a balun structure, a radiation structure disposed on the balun structure, and a coupling structure disposed on the radiation structure.

[0006] WO2022012023A1 discloses a low-frequency radiation unit, including a dielectric substrate, a radiator and a feeding balun, the radiator containing two orthogonally distributed dipoles, radiation arms of the two dipoles being respectively formed by a vertical line and a horizontal line and forming a cross-shaped line together, tail ends of the vertical line and the horizontal line being connected by means of a circular arc line, and a plurality of bent lines being provided in the middle of the circular arc line; and the feeding balun being of an orthogonal structure, the bottom of the feeding balun being connected to a feeding network, and the top of the feeding balun being connected to the radiator.SUMMARY

[0007] The invention is set out in the appended set of claims.BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to clearly illustrate the solutions of the embodiments according to the present application, the accompanying drawings used in the description of the embodiments are briefly introduced below. FIG. 1 is a three-dimensional schematic structural diagram of a low-frequency filtering radiating element according to an embodiment of the present application; FIG. 2 is a schematic structural diagram of a front side of a substrate in FIG. 1; FIG. 3 is a schematic structural diagram of a rear side of the substrate in FIG. 1; FIG. 4 is a three-dimensional schematic structural diagram of a base station antenna according to an embodiment of the present application; reference numerals:

[0009] 10: base station antenna; 100: low-frequency filtering radiating element; 110: substrate; 111: first mounting surface; 112: second mounting surface; 120: low-frequency radiating element; 121: dipole arm; 122: radiation arm; 123: filtering member; 124: inductive stub; 130: fed element; 131: feeder balun; 132: filtering stub; 140: support seat; 141: feeder substrate; 142: base; 200: pedestal; 300: high-frequency radiating element.DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] In the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and so on are based on the orientations or positional relationships shown in the drawings, which are only for convenience and simplifying of describing the embodiments of the present application, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, or be construct or operate in a specific orientation, and therefore should not be construed as limits of the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purpose only, and should not be construed as indicating or implying relative importance.

[0011] In the embodiments of the present application, it should be noted that unless otherwise specified and limited, the terms "connected" and "joined" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or integrated connection; it can be mechanical connection or electrical connection; or it can be direct connection or indirect connection through an intermediary. Those of ordinary skill in the art may understand the specific meanings of the above terms in the embodiments of the present application in specific situations.

[0012] In the embodiments of the present application, unless otherwise specified and limited, a first feature being "above" or "below" a second feature may mean that the first feature and the second feature are in direct contact, or the first feature and the second feature are in indirect contact through an intermediary. Moreover, the first feature being "above", "upward" or "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or only mean that a horizontal height of the first feature is higher than a horizontal height of the second feature. The first feature being "below", "downward" or "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or only mean that a horizontal height of the first feature is lower than a horizontal height of the second feature.

[0013] In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and so on mean that specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in suitable manners in any one or multiple embodiments or examples. In addition, those skilled in the art may combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

[0014] A low-frequency filtering radiating element 100 and a base station antenna 10 according to the present application are described below with reference to FIG. 1 to FIG. 4.

[0015] In a traditional multi-band integrated antenna, a low-frequency radiating element is relatively large in size compared to a high-frequency radiating element, which always deteriorates high-frequency indicators in multi-band integrated systems. The present application provides a low-frequency filtering radiating element 100, including: a substrate 110, which includes a first mounting surface 111 and a second mounting surface 112 arranged opposite; a low-frequency radiating element 120, which includes four pairs of dipole arms 121 distributed on the substrate 110 centrosymmetrically, where the four pairs of dipole arms 121 are distributed in orthogonal polarization to form two groups of ±45° polarized radiating elements, each pair of dipole arms 121 includes two radiation arms 122 arranged on the first mounting surface 111 and the second mounting surface 112 respectively, and the two radiation arms 122 are arranged in a mirror mode.

[0016] The low-frequency filtering radiating element 100 constitutes a fundamental structure of an antenna, and can effectively radiate or receive radio waves. The low-frequency filtering radiating element 100 may be made of materials as required, such as a printed circuit board (PCB) or a metal die-cast plate. In an example, the substrate 110 is the PCB or the metal die-cast plate correspondingly. A dielectric thickness, a dielectric constant and related parameters of the substrate 110 may be set according to actual requirements, for example, a range of the dielectric thickness of the substrate 110 is 0.2 mm to 3 mm, and a range of the dielectric constant is 2 to 10.

[0017] The low-frequency filtering radiating element 100 according to the present application, includes two groups of ±45° polarized radiating elements, where the radiating element consisted of two dipole arms 121 not only has better element radiation performance than a common single dipole arm 121 crossed antenna, array performance is also more stable; and compared to a bowl-shaped radiating element, the low-frequency filtering radiating element 100 according to the present application has higher integration, smaller installation area, more flexible array and may significantly improve the applicability of the radiating element.

[0018] In an embodiment, each of the first mounting surface 111 and the second mounting surface 112 is provided with a fed element 130 respectively, the fed element 130 includes four orthogonally distributed feeder baluns 131, and each of the feeder baluns 131 is connected to a corresponding radiation arm 122, two feeder baluns 131 on a same extension line in a direction of ±45° in each fed element 130 are cascaded at the center of the substrate 110 to make the two dipole arms 121 on the same extension line in a direction of ±45° form a ±45° polarized radiating element. Further, each of the feeder baluns 131 is provided with at least one filtering stub 132, and the filtering stub 132 is used to reduce the affect of the low-frequency radiating element 120 on the high-frequency radiating element. It should be noted that the number and shape of the filtering stubs 132 may be set according to actual requirements, for example, the filtering stubs 132 may be set as the same or different shapes, different lengths and different widths, and the filtering stubs 132 may be linear, curved or L-shaped, which is not specifically limited in this embodiment. In this embodiment, the filtering stubs 132 form multiple filtering stub groups, the multiple filtering stub groups are sequentially distributed at intervals along the length direction of the corresponding feeder balun 131, and two filtering stubs 132 of each filtering stub group are symmetrically distributed on both sides at intervals along the length direction of the corresponding feeder balun 131, and the filtering stubs 132 are L-shaped.

[0019] In the related art, decoupling between radiating elements of different frequency bands is mainly achieved in the feeder network, by the form of circuits, and by filter manners such as adding isolation strips, barriers, elements or PCBs between radiating elements of different frequency bands, to reduce a coupling between the radiating elements of different frequency bands as much as possible. However, this manner needs to add a large number of filtering elements between the radiating elements, which occupies a lot of space, results in a small space occupation of the radiating elements on the antenna, affects the overall layout of the radiating elements on the antenna, and makes it harder for the antenna as a whole to meet the requirement of the number of frequency bands, or the effect of eliminating interference cannot meet the expected requirements. In the present application, in an embodiment, each radiation arm 122 includes multiple filtering members 123 and inductive stubs 124 connected to the filtering members 123. By adding filtering members 123 in the radiation arm 122, filtering effect is achieved, which causes the radiation arm 122 to have a certain filtering effect on interference from other frequency bands, to avoid changing the arrangement of the radiation arms 122 on the antenna and occupying extra space of the antenna.

[0020] It should be noted that the number and shape of the filtering member 123 of each radiation arm 122 may be set according to actual requirement, for example, the filtering members 123 may be set as the same or different shapes, different lengths and different widths, and the filtering members 123 are connected by inductive stubs 124, which is not specifically limited in this embodiment. In this embodiment, the radiation arm 122 is configured as rectangular in shape, the filtering member 123 is correspondingly configured as rectangular in shape and the inductive stub 124 is configured as strip in shape and used for connecting the filtering members 123.

[0021] In an embodiment, the low-frequency filtering radiating element 100 also includes a support seat 140, which includes a base 142 and two feeder substrates 141 located on the base 142. The two feeder substrates 141 are orthogonally distributed and connected to the fed element 130 on the second mounting surface 112, and are used to feed the feeder baluns 131. The feeder substrate 141 may be PCB or metal die-cast plates, which is not limited in the present application. In an embodiment, a feeder circuit is provided inside the feeder balun 131, and the feeder circuit is used to feed a corresponding radiation arm 122 through a coaxial line and / or a feeder pad.

[0022] Based on the aforementioned low-frequency filtering radiating element 100, the present application also provides a base station antenna 10, including: a pedestal 200; multiple high-frequency radiating elements 300, which are located on the pedestal 200; and low-frequency filtering radiating elements 100, which are distributed at intervals between the high-frequency radiating elements 300. The spacing of the high-frequency radiating elements is 0.7 λ~0.9 λ. λ is a wavelength of a center frequency point of a high-frequency radiating element. Since the main improvement of the present application is in the low-frequency filtering radiating element 100, the detailed structure of the base station antenna 10 is not further described.

Examples

Embodiment Construction

[0010]In the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and so on are based on the orientations or positional relationships shown in the drawings, which are only for convenience and simplifying of describing the embodiments of the present application, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, or be construct or operate in a specific orientation, and therefore should not be construed as limits of the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purpose only, and should not be construed as indicating or implying relative importance.

[0011]In the embodiments of the present application, it should be noted that unless oth...

Claims

1. A low-frequency filtering radiating element (100), characterized by, comprising: a substrate (110), comprising a first mounting surface (111) and a second mounting surface (112) arranged opposite; and a low-frequency radiating element (120), comprising four pairs of dipole arms (121) distributed on the substrate (110) centrosymmetrically, wherein the four pairs of dipole arms (121) are distributed in orthogonal polarization to form two groups of ± 45° polarized radiating elements, each pair of dipole arms (121) comprises two radiation arms (122) arranged on the first mounting surface (111) and the second mounting surface (112) respectively, and the two radiation arms (122) are arranged in a mirror mode, wherein each of the first mounting surface (111) and the second mounting surface (112) is provided with a fed element (130), the fed element (130) comprises four orthogonally distributed feeder baluns (131), and each of the feeder baluns is connected to a corresponding radiation arm, two feeder baluns on a same extension line in a direction of ±45° in each fed element are cascaded at a center of the substrate; each of the feeder baluns (131) is provided with at least two filtering stubs (132), wherein the filtering stubs (132) form multiple filtering stub groups, the multiple filtering stub groups are sequentially distributed at intervals along a length direction of a corresponding feeder balun (131), and two filtering stubs (132) of each filtering stub group are symmetrically distributed on both sides at intervals along the length direction of the corresponding feeder balun (131).

2. The low-frequency filtering radiating element (100) of claim 1, wherein each of the filtering stubs (132) is linear, curved or L-shaped.

3. The low-frequency filtering radiating element (100) of claim 1, wherein each of the radiation arms (122) comprises multiple filtering members (123) and inductive stubs (124) connected to the filtering members (123).

4. The low-frequency filtering radiating element (100) of claim 1, further comprising a support seat (140), including a base (142) and two feeder substrates (141) located on the base (142), and the two feeder substrates (141) are orthogonally distributed and connected to the fed element (130) on the second mounting surface (112).

5. The low-frequency filtering radiating element (100) of claim 1, wherein an inside of each of the feeder baluns (131) is provided with a feeder circuit, and the feeder circuit is used to feed a corresponding radiation arm (122) through a coaxial line and / or a feeder pad.

6. A base station antenna (10), characterized by, comprising: a pedestal (200); multiple high-frequency radiating elements (300), where the multiple high-frequency radiating elements (300) are located on the pedestal (200); and multiple low-frequency filtering radiating elements (100) of any one of claims 1 to 5, which are distributed at intervals between the high-frequency radiating elements (300).

7. The base station antenna (10) of claim 6, wherein a spacing of the high-frequency radiating elements (300) is 0.7 λ~0.9 λ.

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