A radiation unit and a base station antenna

Abstract

The present disclosure relates to the technical field of antennas, and particularly relates to a radiating unit and a base station antenna. The radiating unit comprises a plurality of radiating arms and a slow wave circuit structure, the slow wave circuit structure is arranged on at least one radiating arm; the slow wave circuit structure comprises a plurality of conductor segments arranged at intervals, the first ends of the plurality of conductor segments are connected with the radiating arm, and the contact surfaces of the conductor segments and the radiating arm have a certain included angle. The technical scheme of the present disclosure is beneficial to realizing miniaturized design of the radiating unit, weakening the influence of the low-frequency radiating unit on the performance of the high-frequency radiating unit, improving the stability of the radiation pattern of the high-frequency radiating unit in the array base station antenna, and improving the user experience.

Description

Technical Field

[0001] This disclosure relates to the field of antenna technology, and in particular to a radiating element and a base station antenna. Background Technology

[0002] In the field of mobile communication base station antennas, base station antennas can effectively improve antenna space utilization and reduce antenna equipment site rental costs while providing more diversified services. Therefore, base station antennas have become an important research direction in the field of next-generation wireless communication.

[0003] Base station antennas typically consist of radiating elements operating in different frequency bands, including at least one low-frequency radiating element and at least one high-frequency radiating element. In a multi-band antenna, these radiating elements are placed within a limited space. Traditional radiating elements are relatively large, difficult to arrange, and prone to strong cross-band scattering interference between different elements. Traditional radiating elements severely degrade the performance of multi-band antennas; for example, low-frequency radiating elements affect the performance of high-frequency radiating elements, specifically by worsening port isolation between different frequency band radiating elements and distorting the radiation pattern of high-frequency radiating elements, thus impacting the user experience. Summary of the Invention

[0004] To solve the above-mentioned technical problems, or at least partially solve them, the present invention provides a radiating element and a base station antenna, which facilitates the miniaturization of the radiating element design while reducing the impact of the low-frequency radiating element on the performance of the high-frequency radiating element, thereby improving the stability of the radiation pattern of the high-frequency radiating element in the array-type base station antenna.

[0005] In a first aspect, embodiments of this disclosure provide a radiating element, including:

[0006] Multiple radiating arms and a slow-wave circuit structure, wherein the slow-wave circuit structure is disposed on at least one of the radiating arms;

[0007] The slow-wave circuit structure includes multiple conductor segments spaced apart from each other. The first end of each conductor segment is connected to the radiating arm, and the contact surface between each conductor segment and the radiating arm has a certain angle.

[0008] In some embodiments, the second ends of the plurality of conductor segments are insulated from each other, or the second ends of the plurality of conductor segments are electrically connected to each other.

[0009] In some embodiments, the radiating element operates in the low-frequency band, and the gap between the first ends of any two adjacent conductor segments is less than 0.05λ, where λ is the wavelength of the high-frequency radiating element's operating frequency band.

[0010] In some embodiments, the length of the conductor segment is 0.05λ to 0.25λ.

[0011] In some embodiments, the radiating arm is configured as a ring-shaped radiating arm.

[0012] In some embodiments, the slow-wave circuit structure is disposed on the inner arm of the annular radiating arm.

[0013] In some embodiments, the radiating unit further includes:

[0014] An independent conductor structure is provided, with the high-frequency radiation unit corresponding to the lower part of the independent conductor structure disposed on the inner side of the annular radiation arm.

[0015] In some embodiments, the total length of the profile of the vertical projection of the independent conductor structure onto the plane of the radiating arm is 0.4λ to 1λ, where λ is the wavelength of the operating frequency band of the high-frequency radiating unit.

[0016] Secondly, embodiments of this disclosure also provide a base station antenna, comprising:

[0017] Low-frequency radiation unit and high-frequency radiation unit, wherein the low-frequency radiation unit is a radiation unit as described in any of the first aspects.

[0018] In some embodiments, a plurality of the high-frequency radiation units form a high-frequency array, and the low-frequency radiation units are inserted into the array gaps of the high-frequency array, or the low-frequency radiation units and the high-frequency radiation units are nested together.

[0019] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0020] The radiating element provided in this embodiment includes multiple radiating arms and a slow-wave circuit structure. The slow-wave circuit structure is disposed on at least one radiating arm. The slow-wave circuit structure includes multiple conductor segments spaced apart from each other. The first ends of each conductor segment are connected to a radiating arm, and the contact surfaces of each conductor segment and the radiating arm have a certain angle. Therefore, when the radiating element provided in this embodiment operates in the low-frequency band, by loading the slow-wave circuit structure onto the radiating arm, the aperture of the low-frequency radiating element can be reduced. On the one hand, this reduces the coupling effect between adjacent radiating elements in the array-type low-frequency radiating element, which is beneficial to improving the stability of the radiation pattern of the array-type low-frequency radiating element. On the other hand, it reduces the blocking effect of the low-frequency radiating element on the high-frequency radiating element, thereby reducing the coupling effect between the low-frequency and high-frequency radiating elements, which is beneficial to improving the stability of the radiation pattern of the high-frequency radiating element in the array-type base station antenna. Thus, the slow-wave circuit structure is simple and flexible in design, which is conducive to achieving miniaturization of the low-frequency radiating element while weakening the influence of the low-frequency radiating element on the performance of the high-frequency radiating element, thereby improving the stability of the radiation pattern of the high-frequency radiating element in the array-type base station antenna. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0022] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A top view of a radiating element provided in an embodiment of this disclosure;

[0024] Figure 2 A schematic diagram comparing the aperture of a radiating element and a conventional radiating element provided for an embodiment of this disclosure;

[0025] Figure 3 A comparison diagram of simulation results of radar cross-section variation with frequency for a radiating element and a conventional radiating element provided in this embodiment of the present disclosure;

[0026] Figure 4 This is a partially enlarged top view of a radiating element provided in an embodiment of the present disclosure;

[0027] Figure 5 A top view of another radiating unit provided in an embodiment of this disclosure;

[0028] Figure 6 A top view of another radiating unit provided in an embodiment of this disclosure;

[0029] Figure 7 An impedance simulation diagram of a slow-wave circuit structure in the high-frequency band provided for an embodiment of this disclosure;

[0030] Figure 8 A top view of another radiating unit provided in an embodiment of this disclosure;

[0031] Figure 9 A top view of another radiating unit provided in an embodiment of this disclosure;

[0032] Figure 10 A simulated standing wave diagram of a radiating element provided in an embodiment of this disclosure;

[0033] Figure 11 This is a side view of a base station antenna provided in an embodiment of the present disclosure;

[0034] Figure 12 A schematic diagram illustrating the simulation fluctuations of a base station antenna in a high-frequency operating band, provided as an embodiment of this disclosure;

[0035] Figure 13 This is a schematic diagram illustrating the simulation fluctuations of a base station antenna in a high-frequency operating band, as provided in related technologies. Detailed Implementation

[0036] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0037] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0038] The slow-wave circuit structure of the radiating unit provided in this embodiment is simple and flexible in design. It is beneficial to realize the miniaturization design of the low-frequency radiating unit while weakening the impact of the low-frequency radiating unit on the performance of the high-frequency radiating unit, thereby improving the stability of the radiation pattern of the high-frequency radiating unit in the array base station antenna.

[0039] The radiating element and base station antenna provided in the embodiments of this disclosure are described below with reference to the accompanying drawings.

[0040] Figure 1 This is a top view schematic diagram of a radiating element provided in an embodiment of this disclosure.Figure 1 As shown, the radiation unit 010 includes multiple radiation arms 11 and a slow-wave circuit structure 12, with the slow-wave circuit structure 12 disposed on at least one radiation arm 11. Figure 1 Four radiating arms 11 are shown as an example, and a slow-wave circuit structure 12 is provided on each of the radiating arms 11. The slow-wave circuit structure 12 includes a plurality of conductor segments arranged at intervals from each other. The first end of each of the plurality of conductor segments is connected to the radiating arm 11, and the contact surface between each conductor segment and the radiating arm 11 has a certain angle.

[0041] Specifically, the radiation unit 010 operates in the low-frequency band, meaning that the radiation unit 010 is a low-frequency radiation unit. The radiation unit 010 includes a radiation arm 11 and a slow-wave circuit structure 12, which can effectively radiate or receive radio waves.

[0042] The specific number of radiating arms 11 and the specific number of slow-wave circuit structures 12 can be set according to actual needs, and this embodiment does not impose specific limitations on them.

[0043] The slow-wave circuit structure 12 provided on the radiating arm 11 serves as a current extension path and has an electrical delay effect, which can effectively increase the electrical length of the antenna radiating element. Compared with conventional radiating elements, the radiating element 010 provided in this embodiment of the present disclosure, by providing the slow-wave circuit structure 12 on the radiating arm 11, can effectively increase the electrical length of the radiating element because the slow-wave circuit structure 12 serves as a current extension path and has an electrical delay effect. Under the condition that the electrical length remains unchanged, the aperture of the radiating element can be reduced, thereby realizing the miniaturization design of the radiating element 010.

[0044] For example, Figure 2 This is a schematic diagram comparing the aperture of a radiating element and a conventional radiating element, provided as an embodiment of this disclosure. Figure 2 As shown, when achieving the same low-frequency operating band, such as but not limited to the operating band of 698-960MHz, the left figure shows a conventional radiating element with an aperture of 127*127 mm; the right figure shows a radiating element provided by the embodiment of this disclosure with an aperture of 113*113 mm. Thus, when achieving the same operating band, the aperture of the radiating element provided by the embodiment of this disclosure is smaller than that of the conventional radiating element, which can realize the miniaturization design of the radiating element, thereby facilitating the miniaturization design of the antenna.

[0045] For example, Figure 3 A comparison chart of simulation results of radar cross-section variation with frequency for a radiating element and a conventional radiating element provided in this disclosure embodiment. Figure 3 As shown, the horizontal axis represents frequency in GHz, and the vertical axis represents radar cross-section in dB. Figure 3As can be seen, the radar cross section (RCS) of the low-frequency radiating unit provided in this embodiment is significantly lower than that of the traditional low-frequency radiating unit in the high-frequency band.

[0046] Specifically, the slow-wave circuit structure 12 includes multiple conductor segments, with one end of the conductor segment connected to the radiating arm 11 serving as the first end of the conductor segment, and the other end of the conductor segment serving as the second end of the conductor segment. Figure 1 Each slow-wave circuit structure 12 is shown to include two conductor segments, namely a first conductor segment 121 and a second conductor segment 122. The first ends of the first conductor segment 121 and the second conductor segment 122 are connected to the radiating arm 11, and the second ends of the first conductor segment 121 and the second conductor segment 122 are away from the radiating arm 11, so that the contact surfaces of each conductor segment and the radiating arm 11 can form a certain angle.

[0047] For example, Figure 4 This is a partially enlarged top view of a radiating element provided in an embodiment of this disclosure. Figure 4 As shown, the connection between the slow-wave circuit structure 12 and the radiating arm 11 forms an angle A.

[0048] The conductor segment can be either a metallic conductor segment or a non-metallic conductor segment, as long as it meets the operational requirements of the radiation unit provided in this embodiment, and is not specifically limited herein. In other embodiments, the slow-wave circuit structure may include three, four, or more conductor segments, and is not specifically limited herein.

[0049] For example, Figure 5 This is a top view schematic diagram of another radiating unit provided in an embodiment of this disclosure. (See attached diagram.) Figure 5 As shown, the slow wave circuit structure 12 includes a first conductor segment 121, a second conductor segment 122 and a third conductor segment 123, thus each slow wave circuit structure includes three conductor segments.

[0050] Reference Figure 1 or Figure 2 As shown, the radiating unit provided in this embodiment further includes a dielectric substrate 13, and the radiating arm 11 is disposed on the dielectric substrate, such as, but not limited to, a printed circuit board (PCB). The PCB may have a thickness of 30 mil and a dielectric constant of 3.0, or may be set according to specific actual needs, and is not specifically limited here.

[0051] The radiating element provided in this embodiment includes multiple radiating arms and a slow-wave circuit structure. The slow-wave circuit structure is disposed on at least one radiating arm. The slow-wave circuit structure includes multiple conductor segments spaced apart from each other. The first ends of each conductor segment are connected to the radiating arm, and the contact surfaces of each conductor segment and the radiating arm have a certain angle. Therefore, when the radiating element provided in this embodiment operates in the low-frequency band (i.e., a low-frequency radiating element), by loading the slow-wave circuit structure onto the radiating arm, the aperture of the low-frequency radiating element can be reduced. On the one hand, this reduces the coupling effect between adjacent radiating elements in the array-type low-frequency radiating element, which is beneficial to improving the stability of the radiation pattern of the array-type low-frequency radiating element. On the other hand, it reduces the blocking effect of the low-frequency radiating element on the high-frequency radiating element, thereby reducing the coupling effect between the low-frequency and high-frequency radiating elements, which is beneficial to improving the stability of the radiation pattern of the high-frequency radiating element in the array-type base station antenna. Thus, the slow-wave circuit structure is simple and flexible in design, which is beneficial to miniaturizing the low-frequency radiating element while weakening the impact of the low-frequency radiating element on the performance of the high-frequency radiating element, thereby improving the stability of the radiation pattern of the high-frequency radiating element in the array-type base station antenna and improving the user experience.

[0052] In some embodiments, refer to Figure 1 or Figure 5 The second ends of the multiple conductor segments are insulated from each other. Specifically, such as... Figure 1 As shown, the second ends of the first conductor segment 121 and the second conductor segment 122 are not connected; or, as... Figure 5 As shown, the second ends of the first conductor segment 121, the second conductor segment 122, and the third conductor segment 123 are not connected.

[0053] In some embodiments, Figure 6 This is a top view schematic diagram of another radiating element provided in an embodiment of this disclosure. (See attached diagram.) Figure 6 As shown, the second ends of multiple conductor segments are electrically connected to each other. Specifically, the second ends of the first conductor segment 121 and the second conductor segment 122 constituting the slow-wave circuit structure 12 are electrically connected.

[0054] It should be noted that the preferred implementation of this disclosure is to set the second ends of multiple conductor segments to be mutually insulated, that is, the second ends of multiple conductor segments are not electrically connected, which is beneficial to improving the radiation effect of the radiation unit.

[0055] In some embodiments, combined with Figure 1 and Figure 4 The gap between the second ends of any two adjacent conductor segments is less than 0.05λ, where λ is the wavelength of the high-frequency radiation unit's operating frequency band.

[0056] Specifically, the slow-wave circuit structure 12 includes multiple conductor segments, with coupling gaps set between any two adjacent conductor segments. Simulation results show that setting the coupling gap to 0.05 times the wavelength corresponding to the operating frequency band of the high-frequency radiating element, and setting the length of the conductor segments to 0.05 to 0.25 times the wavelength corresponding to the operating frequency band of the high-frequency radiating element, achieves the impedance characteristics of the slow-wave circuit structure 12 for the high-frequency band. This helps to block the conduction of high-frequency induced current on the radiating arm of the radiating element operating in the low-frequency band, thereby effectively suppressing the scattering of high-frequency signals on the radiating arm of the radiating element and improving the stability of the radiation pattern of the high-frequency radiating element in the multi-frequency array antenna.

[0057] For example, Figure 7 This is a schematic diagram of impedance simulation of a slow-wave circuit structure in the high-frequency band, provided as an embodiment of this disclosure. Figure 7 As shown, the horizontal axis represents frequency in GHz, and the vertical axis represents impedance in Ω. Figure 7 The slow-wave circuit structure provided in this embodiment has impedance characteristics in the high-frequency band (3400-3800MHz).

[0058] It should be noted that the conductor segments constituting the slow-wave circuit structure shown in the above embodiments are all set as regular straight conductors. In the embodiments of this disclosure, the conductor segments constituting the slow-wave circuit structure can also be set as wavy conductors. The embodiments of this disclosure do not make specific limitations in this regard.

[0059] In some embodiments, Figure 8 This is a top view schematic diagram of another radiating element provided in an embodiment of this disclosure. (See attached diagram.) Figure 8 As shown, the first conductor segment 121 and the second conductor segment 122 constituting the slow wave circuit structure 12 are both set as wavy line conductors. While blocking the conduction of high-frequency induced current on the radiation arm 11 of the radiation unit, the physical length of the conductor segment from the second end to the first end can be shortened, which is conducive to optimizing the spatial layout of the conductor segment.

[0060] In some embodiments, Figure 9 This is a top view schematic diagram of another radiating element provided in an embodiment of this disclosure. (See attached diagram.) Figure 9 As shown, the radiating arm 11 is configured as a ring-shaped radiating arm.

[0061] Specifically, the radiating arm 11 is provided with a through hole 14 to form a hollow radiating arm, that is, the radiating arm 11 is set as a ring radiating arm, which can reduce the coupling area between the low frequency radiating unit and the high frequency radiating unit, thereby helping to reduce the high frequency induced current of the low frequency radiating unit coupling to the high frequency radiating unit, thus helping to improve the stability of the radiation pattern of the high frequency radiating unit in the array base station antenna.

[0062] In some embodiments, continue to refer toFigure 9 The slow-wave circuit structure 12 is set on the inner arm of the annular radiating arm.

[0063] Specifically, the radiating arm 11 has a through hole 14 to form a ring-shaped radiating arm. The slow-wave circuit structure 12 can be disposed on the inner arm of the ring-shaped radiating arm or on the outer arm of the ring-shaped radiating arm. This embodiment of the present disclosure does not specifically limit this. In a preferred embodiment of the present disclosure, the slow-wave circuit structure 12 is disposed on the inner arm of the ring-shaped radiating arm, which is beneficial to reducing the aperture of the radiating element and thus facilitating the miniaturization design of the antenna.

[0064] In some embodiments, continue to refer to Figure 9 The radiation unit also includes an independent conductor structure 15, which is disposed on the inner side of the annular radiation arm corresponding to the high-frequency radiation unit below.

[0065] Specifically, a through hole 14 is provided on the radiating arm 11 to form an annular radiating arm. An independent conductor structure 15 is provided in the projection area of ​​the through hole 14, i.e., the hollow structure. That is, the independent conductor structure 15 is placed inside the annular radiating arm and is insulated from the annular radiating arm. A high-frequency radiating unit is provided below the independent conductor structure 15.

[0066] The total length of the external dimension of the independent conductor structure 15 projected vertically onto the plane of the radiating arm 11 is 0.4λ to 1 times the wavelength of the high-frequency radiation unit's operating frequency band. Simulation tests show that the independent conductor structure 15 with the above dimensions has a guiding effect on high-frequency signals and can improve the radiation effect of the high-frequency radiation unit.

[0067] To verify whether the independent conductor structure 15 affects the low-frequency band of the radiating arm 11, a standing wave simulation test was performed on the radiating unit provided in this embodiment of the present disclosure. For example, Figure 10 A simulated standing wave diagram of a radiating element provided in an embodiment of this disclosure. For example... Figure 10 As shown, the horizontal axis represents frequency in MHz, and the vertical axis represents the VSWR (Standing Wave Ratio). Figure 10 It can be seen that the standing wave ratios of the first polarization port and the second polarization port of the radiating unit provided in this embodiment are both less than 1.5, and it can be considered that the influence on the low-frequency band of the radiating unit is negligible.

[0068] Among them, the standing wave ratio is also known as the voltage standing wave ratio. The voltage standing wave ratio is the ratio of the voltage amplitude at the antinode to the voltage amplitude at the trough of the transmission line. It is also called the standing wave coefficient. It is common knowledge for those skilled in the art and will not be elaborated on here.

[0069] Based on the above embodiments, this disclosure also provides a base station antenna. Figure 11This is a side view schematic diagram of a base station antenna provided in an embodiment of this disclosure. (In conjunction with...) Figure 1 and Figure 11 The base station antenna 20 includes a low-frequency radiating element 21 and a high-frequency radiating element 22. Figure 11 An exemplary embodiment is shown, comprising a low-frequency radiation unit 21 and a plurality of high-frequency radiation units 22. The low-frequency radiation unit 21 is the radiation unit 010 as described in the above embodiments, and therefore has the same or similar beneficial effects, which will not be described in detail here.

[0070] In some embodiments, continue to refer to Figure 11 Multiple high-frequency radiation units 22 form a high-frequency array, and low-frequency radiation units 21 are inserted in the array gaps of the high-frequency array.

[0071] In other embodiments, the low-frequency radiation unit 21 and the high-frequency radiation unit 22 may be nested together, but this embodiment does not specifically limit this.

[0072] The low-frequency radiating element 21 in the base station antenna provided in this embodiment adopts... Figure 1 The radiating element 010 described herein is beneficial for achieving miniaturized design of base station antennas.

[0073] For example, Figure 12 This is a schematic diagram illustrating the simulated fluctuations of a base station antenna in a high-frequency operating band, provided as an embodiment of this disclosure. For reference, Figure 13 This is a simulation diagram of the fluctuation of a base station antenna in the high-frequency operating band, provided for related technologies. Figure 12 and Figure 13 The horizontal axis represents the azimuth angle, in degrees (deg), and the vertical axis represents the radiation pattern level, in dB. Combined with... Figure 12 and Figure 13 It can be seen that the base station antennas provided in related technologies exhibit significant fluctuations in the high-frequency operating band, while the base station antennas provided in the embodiments of this disclosure exhibit smaller fluctuations in the high-frequency operating band. Therefore, the base station antennas provided in the embodiments of this disclosure are beneficial in improving the problem of fluctuations in the high-frequency operating band.

[0074] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0075] The above are merely specific embodiments of this disclosure, enabling those skilled in the art to understand or implement this disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to these embodiments, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A radiating unit, characterized in that, include: Multiple radiating arms and a slow-wave circuit structure, wherein the slow-wave circuit structure is disposed on at least one of the radiating arms; The slow-wave circuit structure includes multiple conductor segments spaced apart from each other. The first end of each conductor segment is connected to the radiating arm, and the contact surface between each conductor segment and the radiating arm has a certain angle. The radiating arm is configured as a ring-shaped radiating arm; The slow-wave circuit structure is disposed on the inner arm of the annular radiating arm.

2. The radiating unit according to claim 1, characterized in that, The second ends of the plurality of conductor segments are insulated from each other, or the second ends of the plurality of conductor segments are electrically connected to each other.

3. The radiating element according to claim 1, characterized in that, The radiation unit operates in the low-frequency band, and the gap between the first ends of any two adjacent conductor segments is less than 0.05λ, where λ is the wavelength of the high-frequency radiation unit's operating frequency band.

4. The radiating unit according to claim 3, characterized in that, The length of the conductor segment is 0.05λ to 0.25λ.

5. The radiating element according to claim 1, characterized in that, Also includes: An independent conductor structure is provided, with the high-frequency radiation unit corresponding to the lower part of the independent conductor structure disposed on the inner side of the annular radiation arm.

6. The radiating element according to claim 5, characterized in that, The total length of the outline of the vertical projection of the independent conductor structure onto the plane of the radiating arm is 0.4λ to 1λ, where λ is the wavelength of the operating frequency band of the high-frequency radiating unit.

7. A base station antenna, characterized in that, include: Low-frequency radiation unit and high-frequency radiation unit, wherein the low-frequency radiation unit is the radiation unit as described in any one of claims 1-6.

8. The base station antenna according to claim 7, characterized in that, Multiple high-frequency radiation units form a high-frequency array, and the low-frequency radiation units are inserted into the array gaps of the high-frequency array, or the low-frequency radiation units are nested with the high-frequency radiation units.

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