CN111864367A - Low frequency radiation unit and base station antenna - Google Patents

Abstract

The present invention provides a low-frequency radiation unit, including a radiator, a feeding balun and a bottom plate; the radiator includes two pairs of orthogonally distributed annular radiating arms, the annular radiating arms are divided into a plurality of wide line segments, each adjacent The two wide line segments are respectively connected by a bent line; the feed balun is in an orthogonal structure, the top of the feed balun is connected to the radiator, and the bottom of the feed balun is connected to the radiator the bottom plate. The present invention also provides a base station antenna including the low-frequency radiation unit. Thereby, the low-frequency radiation of the present invention has the function of spatial decoupling, and when the high- and low-frequency antennas are nested and arrayed, the influence of the low-frequency radiation unit on the high-frequency radiation performance can be effectively reduced, and the antenna size can be miniaturized.

Description

Low frequency radiation unit and base station antenna

technical field

The present invention relates to the technical field of wireless communication, and in particular, to a low-frequency radiation unit and a base station antenna.

Background technique

In recent years, wireless communication technology has developed rapidly. From 2G and 3G to now 4G, the 5th generation mobile communication network has also begun to be deployed, and wireless communication equipment is developing in the direction of multi-frequency, miniaturization and high performance. Antenna, as the passive device at the end of wireless mobile communication, has always been a research hotspot of wireless communication technology, and its performance will directly affect the performance of wireless communication. In order to adapt to the rapidly developing wireless communication system, the miniaturization and multi-frequency of the wireless communication base station antenna have become the urgent demands of the market.

The multi-frequency of the wireless communication base station antenna requires the use of more frequency radiating elements, and the miniaturization of the base station antenna requires the radiating elements to be placed more compactly. However, the compact placement of the high-frequency radiation unit and the low-frequency radiation unit will lead to enhanced mutual coupling and interference between the high-frequency radiation unit and the low-frequency radiation unit. The signal coverage performance of the communication base station deteriorates, which affects the user experience of the mobile terminal and even causes network interruption. In order to solve this problem, it is of great significance to integrate the spatial decoupling technology into the radiation unit, so that the antenna radiation unit has the spatial decoupling function for high frequencies while keeping its own radiation characteristics unchanged.

To sum up, the prior art obviously has inconvenience and defects in practical use, so it is necessary to improve it.

SUMMARY OF THE INVENTION

In view of the above-mentioned defects, the purpose of the present invention is to provide a low-frequency radiation unit and a base station antenna. The low-frequency radiation unit has a spatial decoupling function, and can effectively reduce the impact of the low-frequency radiation unit on the high frequency when the high and low frequency antennas are nested. The effect of radiation performance, and can realize the miniaturization of the antenna size.

In order to achieve the above object, the present invention provides a low-frequency radiation unit, including a radiator, a feeding balun and a base plate; the radiator includes two pairs of orthogonally distributed annular radiating arms, and the annular radiating arms are divided into a plurality of wide line segments , each adjacent two wide line segments are respectively connected by a bent line; the feeder balun is in an orthogonal structure, the top of the feeder balun is connected to the radiator, and the feeder balun is in an orthogonal structure. The bottom of the lun is connected to the bottom plate.

According to the low-frequency radiation unit of the present invention, the bent line includes two longitudinal line segments and one transverse line segment, the upper ends of the two longitudinal line segments are respectively connected with the wide line segments, and the lower ends of the two longitudinal line segments are respectively Connect with both ends of the transverse line segment.

According to the low-frequency radiation unit of the present invention, the diameter of the bent line is smaller than the diameter of the wide line segment.

According to the low-frequency radiation unit of the present invention, the annular radiation arm determines the number of the wide line segments according to the operating frequency band of the low-frequency radiation unit and the operating frequency band of the high-frequency radiation unit, and the length of each wide line segment is less than 0.25λ ₂ ; and/or

The lengths of the two longitudinal line segments of the bending line are 0.05λ ₂ to 0.25λ ₂ , and the gap between the two longitudinal line segments is 0.3 to 2 mm; and/or

The current path of the annular radiation arm is 0.25λ ₂ ;

λ ₂ is the working wavelength of the high-frequency radiation unit.

According to the low-frequency radiation unit of the present invention, the radiator further includes a first dielectric plate, and the two pairs of orthogonally distributed annular radiating arms are distributed on the first dielectric plate, and are opposite to the first dielectric plate. The diagonal of the plate is mirror-symmetrical.

According to the low-frequency radiation unit of the present invention, the feed balun is composed of two orthogonally combined circuit boards, each of the circuit boards includes a second dielectric board, and the front surface of the second dielectric board is distributed with There is a feeder circuit, the back of the second dielectric plate is covered with a second metal layer; the feeder circuit is coupled and connected to the second metal layer; the bottom of the second metal layer is connected to the bottom plate, The top of the second metal layer is fed with the radiator.

According to the low-frequency radiation unit of the present invention, the circuit board includes a first circuit board and a second circuit board, the first circuit board is provided with a first fitting groove, and the second circuit board is provided with a first fitting groove. Two fitting grooves; the first circuit board and the second circuit board are respectively fitted into an orthogonal structure through the first fitting groove and the second fitting groove.

According to the low-frequency radiation unit of the present invention, a gap is provided in the middle of the second metal layer of the feeding balun; and/or

The feed line of the feed balun includes an interconnected bottom stripline and an impedance matching stripline.

According to the low-frequency radiation unit of the present invention, the bottom plate includes a third dielectric plate, the bottom of the third dielectric plate is provided with a third metal layer, and the bottom of the second metal layer of the feeding balun is the same as the The third metal layer is connected.

The present invention also provides a base station antenna, comprising a reflector, a plurality of high-frequency radiation units and a plurality of low-frequency radiation units as described above are distributed on the reflector, and the low-frequency radiation units are nested and inserted into the high-frequency radiation unit. the middle of the radiating element.

The low-frequency radiation unit of the present invention includes a radiator with spatial decoupling properties, a feeding balun and a bottom plate; the radiator includes two pairs of orthogonally distributed annular radiating arms, the annular radiating arms are divided into a plurality of wide line segments, each phase The two adjacent wide line segments are respectively connected by a bent line. The annular radiating arm can maximize the aperture area of the current path, can effectively improve the unit gain, and reduce the aperture when the gain remains unchanged, which can be used to realize the miniaturization of the antenna. In addition, the bent line is equivalent to a low-pass filter, which forms a path for the low-frequency current on the annular radiating arm, has a suppressing effect on the high-frequency current, and can effectively reduce the influence on the radiation performance of the high-frequency radiating unit. Thereby, the low frequency radiation unit of the present invention can effectively reduce the influence of the low frequency radiation unit on the high frequency radiation performance when the high and low frequency antennas are nested and arrayed, and can realize the miniaturization of the antenna size.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the preferred low frequency radiation unit of the present invention;

Fig. 2 is the front structure schematic diagram of the radiator of the preferred low frequency radiation unit of the present invention;

FIG. 3 is a schematic view of the front structure of the bent line of the preferred radiator of the present invention;

4A is a schematic view of the front structure of the first circuit board of the preferred feeding balun of the present invention;

4B is a schematic diagram of the back structure of the first circuit board of the preferred feeding balun of the present invention;

4C is a schematic diagram of the front structure of the second circuit board of the preferred feeding balun of the present invention;

4D is a schematic diagram of the back structure of the second circuit board of the preferred feeding balun of the present invention;

Fig. 5 is the three-dimensional structure schematic diagram of the preferred bottom plate of the present invention;

FIG. 6 is a schematic three-dimensional structure diagram of a preferred base station antenna of the present invention;

Figure 7 is a comparison of the 1.71GHz pattern when the base station antenna is pure high frequency, without decoupling and adding decoupling technology;

Figure 8 is a comparison of the 2.3GHz pattern when the base station antenna is pure high frequency, without decoupling and adding decoupling technology;

Figure 9 is a comparison of the 2.69GHz pattern when the base station antenna is pure high frequency, without decoupling and adding decoupling technology;

Figure 10 is a comparison diagram of the scattering characteristics of the base station antenna with and without decoupling.

Reference number:

low frequency radiation unit 100; radiator 10; feeding balun 20;

bottom plate 30; annular radiating arm 11; wide line segment 12;

Bending line 13; Longitudinal line segment 131; Transverse line segment 132;

the first dielectric board 14; the first circuit board 210; the second circuit board 220;

the second dielectric plate 21; the feeding line 22; the second metal layer 23;

the first fitting groove 211; the second fitting groove 221; the third dielectric plate 31;

the third metal layer 32; the base station antenna 200; the reflector 300;

High frequency radiation unit 400 .

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

It should be noted that references in this specification to "one embodiment", "an embodiment", "example embodiment", etc., mean that the described embodiment may include specific features, structures or characteristics, but not every Embodiments must contain these specific features, structures or characteristics. Furthermore, such expressions are not referring to the same embodiment. Further, when a particular feature, structure or characteristic is described in conjunction with an embodiment, whether or not explicitly described, it has been shown that it is within the knowledge of those skilled in the art to incorporate such feature, structure or characteristic into other embodiments .

In addition, certain terms are used in the description and the following claims to refer to specific components or components, and it should be understood by those of ordinary skill in the art that manufacturers may use different terms or terms to refer to the same component or component. This specification and the following claims do not use the difference in name as a way of distinguishing components or parts, but use the difference in function of the components or parts as a criterion for distinguishing. References to "including" and "comprising" throughout the specification and subsequent claims are open-ended terms and should be interpreted as "including but not limited to". Otherwise, the term "connected" herein includes any direct and indirect means of electrical connection. Indirect electrical connection means include connection through other means.

1 to 5 show the preferred structure of the low-frequency radiation unit of the present invention. The low-frequency radiation unit 100 includes a radiator 10 with a spatial decoupling function, a feeder balun 20 located at the bottom of the radiator 10 and a feeder balun 20 located at the bottom of the radiator 10. The bottom plate 30 at the bottom of the lun 20. The radiator 10 (or vibrator) includes two pairs of orthogonally distributed annular radiating arms 11, which are respectively placed in the ±45° direction of the dielectric substrate 10 to form two polarizations of ±45°, that is, four annular radiations. The arms 11 together constitute a dual polarized radiation unit. The annular radiating arm 11 is divided into a plurality of wide line segments 12 , and each adjacent two wide line segments 12 are respectively connected by a bent line 13 . The annular radiating arm 11 can maximize the aperture of the current path, can effectively improve the unit gain, and reduce the aperture when the gain remains unchanged, which can be used to realize the miniaturization of the antenna. The bent line 13 is equivalent to a low-pass filter, which forms a path for the low-frequency current on the annular radiating arm 11, has a suppressing effect on the high-frequency current, and can effectively reduce the impact on the radiation performance of the high-frequency radiating unit. The feeding balun 20 has an orthogonal structure, the top of the feeding balun 20 is connected to the radiator 10 for feeding, and the bottom of the feeding balun 20 is connected to the bottom plate 30 .

The present invention proposes a low-frequency radiation unit 100 with a spatial decoupling function. The low-frequency radiation unit 100 has the characteristics of maximum gain of the same aperture, miniaturization, etc. The electromagnetic wave signal transmission has the function of decoupling, which can effectively solve the problem of high and low frequency mutual coupling in the base station antenna, which is beneficial to the miniaturization, multi-frequency and low cost of the base station antenna. In addition, the combined form of the low-frequency radiation unit 100 of the present invention has a simple and stable structure, and is easy to assemble.

As shown in FIG. 2 and FIG. 3 , the radiator 10 further includes a first dielectric plate 14 , and two pairs of orthogonally distributed annular radiating arms 11 are distributed on the first dielectric plate 14 and are opposite to the diagonal corners of the first dielectric plate 14 . The line mirror symmetry ensures that the radiation characteristic beam is symmetrical in the polarization direction, and the spatial decoupling characteristic is stable. The radiator 10 includes four orthogonally distributed annular radiating arms 11, and the annular radiating arms 11 are preferably composed of metal strip lines, the metal strip lines are preferably metal copper foils, and the metal strip lines are along a quarter of the mouth surface. The outer edge forms a ring shape to maximize the current path aperture. The current path of each ring-shaped radiation arm 11 is about 0.25λ ₂ , where λ ₂ is the working wavelength of the high-frequency radiation unit 400 . Compared with the same type of feed cross, the low-frequency radiation unit 100 of the present invention achieves the same gain size and increases by 15% to 25%, and the radiation unit is miniaturized, which is beneficial to the miniaturization of the whole machine. Preferably, the annular radiating arm 11 determines the number of wide line segments 12 according to the working frequency band of the low frequency radiation unit 100 and the working frequency band of the high frequency radiation unit 400, to ensure that the length of each wide line segment 12 is less than 0.25λ ₂ , λ ₂ is the working wavelength of the high-frequency radiation unit 400 . Select a reasonable number of segments of the wide line segment 12 to break up the radiation arms of the low-frequency radiation unit 100, so that electromagnetic waves cannot resonate and scatter on the low-frequency radiation unit 100, that is, the high-frequency radiation unit achieves stealth function.

As shown in FIG. 3 , the bent line 13 of the radiator 10 preferably includes two longitudinal line segments 131 and one transverse line segment 132 , the upper ends of the two longitudinal line segments 131 are respectively connected with the wide line segment 12 , and the lower ends of the two longitudinal The two ends of the horizontal line segment 132 are respectively connected to form the n-type structure line 13 . When the high-frequency signal current passes through the n-type structure line, the structure will have a strong blocking effect, so for high frequency, the ring structure composed of the wide line segment 12 and the n-type structure line 13 is equivalent to a segment of separated wide lines , the electrical dimension of the wide line is small enough relative to the high frequency signal, so the segment of the annular strip line forms the spatial decoupling characteristic of the low frequency unit. The length L of the two longitudinal line segments 131 of the bending line 13 is 0.05λ ₂ ˜0.25λ ₂ , and the gap FW between the two longitudinal line segments 131 is 0.3˜2 mm. The length L and the slot FW of the n-shaped structure line 13 can be adjusted, and the size can be designed and optimized for different frequencies to optimize a specific frequency. ,

Preferably, the diameter of the bending line 13 is smaller than the diameter of the wide line segment 12 . An n-type structure line 13 is inserted between each wide line segment 12 of the low-frequency radiation unit 100, and the n-type structure line 13 is equivalent to a low-pass filter, which forms a path for the low-frequency current on the annular radiating arm 11, and has the function of suppressing the high-frequency current. Because each section size cannot resonate at high frequencies and cannot absorb and scatter high-frequency electromagnetic waves, it forms a spatial decoupling function.

The low-frequency radiation unit 100 of the present invention segments the radiation arms and inserts the space decoupling structure to realize the spatial decoupling function of the low-frequency radiation unit 100 without increasing the overall size of the antenna, which is simple and effective. At the same time, the low-frequency radiation unit 100 of the present invention has a simple structure, Input impedance convergence is easy to match. By adjusting the lengths, slits and positions of the bent lines 13 respectively, the spatial decoupling performance of a specific frequency can be optimized, and multiple frequency points can be optimized, thereby realizing the spatial broadband decoupling effect.

FIG. 4A to FIG. 4D show the structure of the feeding balun of the preferred low-frequency radiation unit of the present invention. The feeding balun 20 is composed of two orthogonally combined circuit boards, and the circuit boards are preferably PCB circuit boards. . Each circuit board includes a second dielectric board 21 , the front surface of the second dielectric board 21 is distributed with feed lines 22 , and the back surface of the second dielectric board 21 is covered with a second metal layer 23 . The feeding line 22 is coupled and connected to the second metal layer 23 . The bottom of the second metal layer 23 is connected to the bottom plate 30 , and the top of the second metal layer 23 is connected to the radiator 10 for feeding. The feeding line 22 is preferably realized by metal strips such as metal copper foil, and the second metal layer 23 is preferably realized by metal copper foil.

Preferably, the circuit board includes a first circuit board 210 and a second circuit board 220, respectively feeding the two pairs of polarized annular radiating arms 11, the first circuit board 210 is provided with a first fitting groove 211, The second circuit board 220 is provided with a second fitting groove 221 . The first circuit board 210 and the second circuit board 220 are respectively fitted into each other through the first fitting groove 211 and the second fitting groove 221 to form a 90-degree orthogonal structure.

Preferably, a gap is provided in the middle of the second metal layer 23 of the feeding balun 20 . The feeding line 22 of the feeding balun 20 includes a bottom strip line and an impedance matching strip line connected to each other, and the impedance matching characteristic structure is very simple. The bottom strip line is preferably 50 ohms, and the impedance matching strip line plays the role of impedance matching. The radio signal of the impedance matching strip line passes through the bottom strip line of the feeding balun 20, passes through the impedance matching strip line, and couples the signal to the double line formed by the gap in the middle of the second metal layer 23, and the signal is transmitted to the feeding bar through the double line. The top of the lun 20 is radiated out through the radiator 10.

As shown in FIG. 5 , the bottom plate 30 includes a third dielectric plate 31 , the bottom of the third dielectric plate 31 is provided with a third metal layer 32 , and the second metal layer of the two circuit boards 210 and 220 of the feeding balun 20 The bottoms of 23 are respectively connected with the third metal layer 32 . The third metal layer 32 is preferably realized by metal copper foil.

As shown in FIGS. 4A-4B , the top of the first circuit board 210 is provided with at least two first upper tabs, the top of the second circuit board 220 is provided with at least two second upper tabs, and the annular radiator At least four upper slots are correspondingly provided on the 10, and the first circuit board 310 and the second circuit board 320 are respectively clamped to the upper slots of the radiator 20 through the first upper protrusion and the second upper protrusion, so as to realize Feed connection.

As shown in FIGS. 4C to 4D , the bottom of the first circuit board 210 is provided with at least two first lower tabs. The bottom of the second circuit board 220 is provided with at least two second lower tabs, and the bottom plate 30 is provided with at least four lower slots correspondingly. The two lower lugs are clamped at the lower slot of the grounding sheet, so as to realize the connection between grounding and feeding.

FIG. 6 shows the structure of a preferred base station antenna of the present invention, and the base station antenna 100 adopts the low-frequency radiation unit 100 shown in the above-mentioned FIGS. 1 to 5 . Specifically, the base station antenna 200 includes a reflector 300 , and a plurality of high-frequency radiation units 400 and a plurality of low-frequency radiation units 100 according to any one of claims 1 to 9 are distributed on the reflector plate 300 . 100 is nested in the middle of the high frequency radiating element 400 . In this embodiment, four high-frequency radiation units 400 are located at four corners of one low-frequency radiation unit 100 . It is worth reminding that the positions and numbers of the low-frequency radiation units 100 and the high-frequency radiation units 400 in the base station antenna 100 are not limited.

Preferably, multiple low frequency radiation units 100 form at least one column of low frequency line arrays, multiple high frequency radiation units 400 form at least one column of high frequency line arrays, and the low frequency line arrays are nested and inserted in the middle of the high frequency line arrays. For example, the base station antenna 200 includes a nested array antenna composed of two columns of low-frequency linear arrays and four columns of high-frequency linear arrays, and the two columns of low-frequency linear arrays are nested and inserted into the middle of the four columns of high-frequency linear arrays. It should be reminded that the number of columns of the high-frequency linear array and the low-frequency linear array of the base station antenna 100 of the present invention is not limited, and can be arbitrarily set according to actual needs.

Figures 7 to 9 respectively show the comparison of the 1.71GHz, 2.3GHz and 2.69GHz patterns of the base station antenna with pure high frequency, no decoupling and adding decoupling technology. The radiation pattern of the high frequency radiation unit 400 is added with low frequency. The radiation unit 100 is basically unchanged before and after. Among them, 1# is a pure high frequency pattern, 2# is a high frequency pattern with a low frequency radiation element without spatial decoupling structure, 3# is a high frequency pattern with an n-structure low frequency radiation element with spatial decoupling characteristics, 2# The pattern is seriously distorted relative to the pure high frequency side, and the 3# pattern is consistent with the pure high frequency pattern.

Figure 10 is a comparison diagram of the scattering characteristics of the base station antenna with and without decoupling. At the same time, AnsysHFSS (three-dimensional electromagnetic simulation software) is used to analyze the scattering characteristics of the RCS (Radar Cross Section, radar reflection cross section) of the low-frequency radiation unit. After adding the spatial decoupling structure, the spatial decoupling structure is relatively not added, and the scattering RCS is greatly reduced, that is, the low-frequency radiation unit of the spatial decoupling of the present invention has little reception and scattering of the high-frequency electromagnetic wave signal, that is, it does not affect the electromagnetic wave signal of the high-frequency radiation unit. Normal transmission, that is, the realization of the spatial decoupling function.

To sum up, the low-frequency radiation unit of the present invention includes a radiator with spatial decoupling properties, a feeding balun and a bottom plate; the radiator includes two pairs of orthogonally distributed annular radiating arms, and the annular radiating arms are divided into multiple As for the wide line segments, each adjacent two wide line segments are respectively connected by a bending line. The annular radiating arm can maximize the aperture area of the current path, can effectively improve the unit gain, and reduce the aperture when the gain remains unchanged, which can be used to realize the miniaturization of the antenna. In addition, the bent line is equivalent to a low-pass filter, which forms a path for the low-frequency current on the annular radiating arm, has a suppressing effect on the high-frequency current, and can effectively reduce the influence on the radiation performance of the high-frequency radiating unit. Thereby, the low frequency radiation unit of the present invention can effectively reduce the influence of the low frequency radiation unit on the high frequency radiation performance when the high and low frequency antennas are nested and arrayed, and can realize the miniaturization of the antenna size.

Of course, the present invention can also have other various embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding Changes and deformations should belong to the protection scope of the appended claims of the present invention.

Claims (10)

1. A low-frequency radiation unit is characterized by comprising a radiator, a feed balun and a bottom plate; the radiator comprises two pairs of annular radiation arms which are distributed orthogonally, the annular radiation arms are divided into a plurality of wide line sections, and every two adjacent wide line sections are connected through a bent line; the feed balun is in an orthogonal structure, the top of the feed balun is connected with the radiating body, and the bottom of the feed balun is connected with the bottom plate.

2. The low frequency radiating element according to claim 1, wherein the meander line comprises two longitudinal line segments and one transverse line segment, wherein the upper ends of the two longitudinal line segments are connected to the wide line segment, and the lower ends of the two longitudinal line segments are connected to the two ends of the transverse line segment.

3. The low frequency radiating element of claim 2, wherein a diameter of the meander line is smaller than a diameter of the wide line segment.

4. The low-frequency radiating element according to claim 2, wherein the loop radiating arm determines the number of the wide line segments according to an operating frequency band of the low-frequency radiating element and an operating frequency band of the high-frequency radiating element, and the length of each wide line segment is less than 0.25 λ₂(ii) a And/or

The length of two longitudinal line segments of the bent line is 0.05 lambda₂～0.25λ₂The gap between the two longitudinal line segments is 0.3-2 mm; and/or

The current path of the annular radiation arm is 0.25 lambda₂；

λ₂Is the operating wavelength of the high-frequency radiating element.

5. The low frequency radiating element of claim 1, wherein the radiator further comprises a first dielectric plate, and the two pairs of orthogonally disposed annular radiating arms are disposed on the first dielectric plate and are mirror-symmetrical with respect to a diagonal of the first dielectric plate.

6. The low-frequency radiating element according to claim 5, wherein the feed balun is formed by two orthogonally combined circuit boards, each circuit board comprises a second dielectric plate, a feed circuit is distributed on a front surface of the second dielectric plate, and a second metal layer is covered on a back surface of the second dielectric plate; the feed line is coupled with the second metal layer; the bottom of the second metal layer is connected with the bottom plate, and the top of the second metal layer is connected with the feed of the radiator.

7. The low frequency radiating element of claim 6, wherein the circuit boards include a first circuit board and a second circuit board, the first circuit board having a first engagement groove formed thereon, the second circuit board having a second engagement groove formed thereon; the first circuit board and the second circuit board are mutually embedded into an orthogonal structure through the first embedding groove and the second embedding groove respectively.

8. The low-frequency radiating element according to claim 6, wherein a gap is provided in the middle of the second metal layer of the feed balun; and/or

The feed line of the feed balun includes a bottom strip line and an impedance matching strip line that are connected to each other.

9. The low-frequency radiating element according to claim 6, wherein the bottom plate comprises a third dielectric plate, a third metal layer is disposed at a bottom of the third dielectric plate, and a bottom of the second metal layer of the feeding balun is connected to the third metal layer.

10. A base station antenna, characterized in that, it comprises a reflection plate, a plurality of high frequency radiation units and a plurality of low frequency radiation units according to any claim 1-9 are distributed on the reflection plate, the low frequency radiation units are nested and inserted in the middle of the high frequency radiation units.

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