CN116315590A

CN116315590A - Antenna structure, base station antenna and base station

Info

Publication number: CN116315590A
Application number: CN202111483933.7A
Authority: CN
Inventors: 陈亮; 道坚丁九; 杜子静; 崔鹤
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-12-07
Filing date: 2021-12-07
Publication date: 2023-06-23

Abstract

The application provides an antenna structure, a base station antenna and a base station. The antenna structure includes a radiating portion, a supporting portion, a reflecting plate, a transmission band line, and a choke branch. The radiation part is arranged on the reflecting plate through the supporting part and is used for receiving signals or radiating signals. The transmission belt line is arranged on the supporting part and is respectively and electrically connected with the feed network and the radiation part, and the transmission belt line is used for feeding signals between the feed network and the radiation part. The choke branch is arranged on the supporting part and is electrically connected with the supporting part, and is used for inhibiting parasitic current from generating on the supporting part. The antenna structure of the antenna structure can restrain parasitic current in the working frequency band of the antenna structure generated on the supporting part by arranging the choke branch on the supporting part, reduces the influence of the parasitic current on the radiating part, ensures that the current distribution on the radiating part can keep balance, can improve the directional diagram of the antenna, improves the radiation performance of the antenna and improves the antenna gain in the working frequency band.

Description

Antenna structure, base station antenna and base station

Technical Field

The present application relates to the field of antenna technologies, and in particular, to an antenna structure, a base station antenna, and a base station.

Background

In a multi-antenna array, due to factors such as layout of the antenna array and limitation of array size, the outer conductor of the transmission line is usually grounded at the periphery of the radiating element as a feed component structure of the radiating element of the antenna, so that the length of the outer conductor of the transmission line is longer. This entails that the length of the transmission line on the outer conductor of the transmission line also needs to be increased accordingly. Because the length of the transmission line is increased, the outer conductor of the transmission line can generate induced parasitic current in a low-frequency working frequency band, and the parasitic current can damage the current distribution on the antenna radiating unit, so that the antenna pattern distortion, the isolation degree reduction and the like can negatively influence the radiation performance of the antenna.

Disclosure of Invention

The application provides an antenna structure, a base station antenna and a base station, so as to improve the radiation performance of the antenna.

In a first aspect, the present application provides an antenna structure that may include a radiating portion, a supporting portion, a reflecting plate, a transmission strip line, and a choke branch. The radiation part can be arranged on the reflecting plate through the supporting part, and the radiation part is used for receiving signals or radiating signals. The transmission belt line can be arranged on the supporting part and is respectively and electrically connected with the feed network and the radiation part, and the transmission belt line is used for feeding signals between the feed network and the radiation part. The choke branch can be arranged on the supporting part, and is electrically connected with the supporting part, so that parasitic current in an operating frequency band of the antenna structure is restrained from being generated on the supporting part, interference influence of the parasitic current on the radiating part is weakened, and current distribution on the radiating part can keep balance, so that the directional diagram of the antenna can be improved, the radiation performance of the antenna is improved, and the antenna gain in the operating frequency band is improved. The antenna structure has the advantages of ideal directional diagram, superior radiation performance, lower structural complexity and lower cost.

In a specific embodiment, the choke dendrites may be in a bar-like structure. The choke branch in the structure has the effect of restraining parasitic current, occupies small space, and does not prevent the normal arrangement of the antenna structure.

In a specific embodiment, a first end of the choke limb in the length direction may be connected to the support portion, and a second end of the choke limb in the length direction extends away from the support portion. The second end of the choke branch in the length direction may be provided with an extension portion, and the extension portion may have a triangular, fan-shaped or circular shape. The arrangement of the extension part can increase the width of the choke branch, so that the bandwidth of the choke branch is increased, the choke branch can cover the frequency band bandwidth of parasitic current easily, and the choke branch can play a role in inhibiting the parasitic current on a wider frequency band. And the arrangement of the extension part can improve the overall impedance of the choke branch, and can reduce the influence of the choke branch on other antennas of the base station antenna array.

When the choke branch is specifically provided, the length direction of the choke branch may be perpendicular to the extending direction of the transmission belt line. The arrangement mode can enable the length of the choke branch to be short, so that the space occupation of the choke branch can be reduced, and the cost of the antenna structure can be reduced.

In a specific embodiment, the number of choke knots may be plural, and the plural choke knots may be disposed at intervals. Each of the plurality of choke branches can function to suppress generation of parasitic current, and the provision of the plurality of choke branches can enhance the suppression of generation of parasitic current as a whole. And, the clearance between adjacent choking branches can make a plurality of choking branches have higher impedance in the whole, can strengthen the parasitic current's of suppression production.

In a specific embodiment, the support may comprise a first support section and a second support section connected to each other, the first support section and the second support section being arranged at an angle. The first end of the first support section is connected with the reflecting plate, the second end of the first support section is connected with the first end of the second support section, and the second end of the second support section is connected with the radiation part. Therefore, the radiation part can be connected with the reflecting plate through the first supporting section and the second supporting section which are mutually connected, the erection of the radiation part is convenient, and the erection mode of the radiation part can be more flexible.

In a specific embodiment, the support part is provided with a connecting medium, through which the transmission belt line can be fixedly connected to the support part. This allows the transmission band to be fixed to the support and allows electrical isolation between the transmission band and the support.

In a specific embodiment, the support may be provided with a transmission belt line on opposite sides thereof. Therefore, a plurality of transmission belt lines can be conveniently arranged according to actual needs, and the distribution of the transmission belt lines on the supporting part can be flexible.

In a second aspect, the present application also provides a base station antenna comprising one or more antenna structures as described above for receiving or transmitting electromagnetic waves. According to the technical scheme, the antenna structure has the advantages of ideal directional diagram, superior radiation performance, lower structural complexity, ideal overall antenna directional diagram of the base station antenna and superior overall performance.

In a third aspect, the present application also provides a base station comprising one or more base station antennas as described above. The base station provided by the application is superior in performance, high in working stability and reliable in performance.

Drawings

FIG. 1 is a schematic diagram of a system architecture applicable to an embodiment of the present application;

fig. 2 is a schematic structural diagram of an antenna feed system of the base station according to an embodiment shown in fig. 1;

fig. 3 is a schematic structural diagram of a base station antenna according to one possible embodiment of the present application;

fig. 4 is a schematic structural diagram of an antenna structure according to an embodiment of the present application;

fig. 5 is a schematic diagram of a transmission band line arrangement situation of an antenna structure according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a choke branch of an antenna structure according to an embodiment of the present disclosure;

fig. 7 is another schematic structural diagram of a choke branch of an antenna structure according to an embodiment of the present disclosure;

fig. 8 is a schematic diagram of still another structure of a choke branch of the antenna structure according to the embodiment of the present application;

fig. 9 is another schematic structural diagram of an antenna structure according to an embodiment of the present application.

Reference numerals:

10-antennas; 20-holding pole; 30-an antenna adjustment bracket; 40-radome; 50-a radio frequency processing unit; a 60-signal processing unit;

70-cable wires; 11-a radiating element; 12-a reflecting plate; a 3-feed network; 31-a transmission component; 32-a calibration network;

33-term shifter; 34-combiner; a 35-filter; 100-radiating part; 200-supporting parts; 300-transmission strip line;

400-choke knots; 201-a first support section; 202-a second support section; 401-extensions.

Detailed Description

Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

For easy understanding, first, an application scenario of the antenna structure related to the present application will be described.

Fig. 1 schematically illustrates a system architecture to which the antenna structure provided in the embodiment of the present application is applicable, as shown in fig. 1, where a radio access network device and a terminal may be included in the system architecture, where the radio access network device includes, but is not limited to, a base station shown in fig. 1. Wireless communication may be implemented between the wireless access device and the terminal. The radio access network device may be located in a base station subsystem (base btation bubsystem, BBS), a terrestrial radio access network (UMTS terrestrial radio access network, UTRAN) or an evolved terrestrial radio access network (evolved universal terrestrial radio access, E-UTRAN) for cell coverage of radio signals to enable a connection between a terminal device and a radio frequency end of the radio network. Specifically, the base station may be a base station (base transceiver station, BTS) in a GSM or CDMA system, a base station (NodeB, NB) in a WCDMA system, an evolved NodeB (eNB or eNodeB) in an LTE system, a radio controller in a cloud radio access network (cloud radio access network, CRAN) scenario, or a relay station, an access point, a vehicle-mounted device, a wearable device, a base station in a 5G network, or a base station in a PLMN network that evolves in the future, for example, a new radio base station.

Fig. 2 shows a schematic structure of an antenna feed system of a base station. The antenna feed system of the base station may generally include the structures of an antenna 10, a pole 20, an antenna adjustment bracket 30, and the like. The antenna 10 of the base station includes a radome 40, and the radome 40 has good electromagnetic wave penetration characteristics in terms of electrical performance, and can withstand the influence of external severe environments in terms of mechanical performance, so as to play a role in protecting an antenna system from the external environment. Radome 40 may be mounted to mast 20 or iron tower via antenna adjustment bracket 30 to facilitate the reception or transmission of signals by antenna 10.

In addition, the base station may further include a radio frequency processing unit 50 and a signal processing unit 60. For example, the rf processing unit 50 may be configured to perform frequency selection, amplification and down-conversion processing on the signal received by the antenna 10, and convert the signal into an intermediate frequency signal or a baseband signal, and send the intermediate frequency signal or the baseband signal to the signal processing unit 60, or the rf processing unit 50 may be configured to perform up-conversion and amplification processing on the intermediate frequency signal processed by the signal processing unit 60, and convert the intermediate frequency signal into electromagnetic waves through the antenna 10 and send the electromagnetic waves. The signal processing unit 60 may be connected to the feeding structure of the antenna 10 through the rf processing unit 50, and is configured to process an intermediate frequency signal or a baseband signal transmitted by the rf processing unit 50.

In one possible embodiment, as shown in fig. 2, the radio frequency processing unit 50 may be integrally provided with the antenna 10, and the signal processing unit 60 is located at the distal end of the antenna 10. In other embodiments, the rf processing unit 50 and the signal processing unit 60 may also be located at the distal end of the antenna 10. The radio frequency processing unit 50 and the signal processing unit 60 may be connected by a cable 70.

More specifically, reference may be made to fig. 2 and fig. 3 together, and fig. 3 is a schematic structural diagram of a base station antenna according to one possible embodiment of the present application. In which, as shown in fig. 3, the antenna 10 of the base station may include a radiation unit 11 and a reflection plate 12. The radiation unit 11 may also be called an antenna element, a vibrator, or the like, and the radiation unit 11 is a basic structural unit constituting an antenna array, and is capable of effectively radiating or receiving an antenna signal. In the antenna 10, the frequencies at which the different radiating elements 11 receive or transmit signals may be the same or different. The reflecting plate 12 may also be called a chassis, an antenna panel, a metal reflecting surface, or the like, and the reflecting plate 12 may reflect and collect the antenna signal at a receiving point. The radiation unit 11 is typically disposed on one side surface of the reflection plate 12, which not only enhances the signal receiving or transmitting capability of the antenna 10, but also serves to block and shield interference of other electric waves from the back surface of the reflection plate 12 (the back surface of the reflection plate 12 in this application refers to the side of the reflection plate 12 opposite to the side on which the radiation unit 11 is disposed) on the signal receiving of the antenna.

In the antenna 10 of the base station, each radiating element 11 may be connected to the feed network 3, respectively. The feed network 3 is typically formed by a controlled impedance transmission line, and the feed network 3 may feed signals to the radiating element 11 with a certain amplitude, phase or send received signals to the signal processing element 60 of the base station with a certain amplitude, phase. In addition, the feed network 3 may implement different radiation beam directives by means of the transmission member 31 or be connected to a calibration network 32 to obtain the calibration signals required by the system. A shifter 33 may be included in the feed network 3 for changing the maximum direction of the antenna signal radiation. A combiner 34 (which may be used to combine signals with different frequencies into one path and transmit the signals through the antenna 10, or may be used to divide the signals received by the antenna 10 into multiple paths according to different frequencies and transmit the multiple paths to the signal processing unit 60 for processing in reverse use) may also be disposed in the feed network 3, and in reverse use, the filter 35 is used to filter out interference signals in the signals sent by the signal processing unit 60.

The antenna structure provided by the embodiment of the application can be adapted to a base station antenna, for example, used as a low-frequency antenna for receiving or transmitting electromagnetic waves in a lower frequency band, and the working frequency band of the antenna structure can be 690-960MHz. Current base station antennas typically have multiple antenna structures forming an antenna array. The antenna structure generally comprises a radiating element and a transmission strip line feeding the radiating element, wherein the transmission strip line is generally arranged on a transmission outer conductor. Due to the fact that the arrangement mode and the spacing of the antenna structures of the antenna array may be asymmetric, the overall arrangement size of the antenna array is limited, and the like, the transmission outer conductor is usually required to be grounded outside the coverage area of the radiating unit when being erected, so that the length of the transmission belt line is increased. The length of the transmission strip line is increased to cause unbalanced current on the transmission outer conductor, and the transmission outer conductor can induce parasitic current in a low-frequency working frequency band, and the parasitic current can damage current distribution on the radiating unit, so that antenna pattern distortion, isolation degree reduction and the like are caused, and the radiation performance of the antenna structure is influenced.

Based on this, the embodiment of the application provides an antenna structure to improve the radiation performance of the antenna.

Referring first to fig. 4, fig. 4 shows a schematic structural diagram of an antenna structure provided in an embodiment of the present application. As shown in fig. 4, the antenna structure provided in the embodiment of the present application may include a radiation portion 100, a reflection plate 12, and a support portion 200. Wherein the radiating portion 100 may function as a radiating element of the antenna structure. The radiating part 100 may be made of conductive materials such as copper, aluminum, etc., and the radiating part 100 may be made in the form of a printed circuit board (printed circuit board, PCB).

The reflecting plate 12 can be used as a reference ground of signals, and the reflecting plate 12 also has the function of providing forward reflection and backward interference shielding for the radiation part 100, wherein the forward direction refers to the direction in which the reflecting plate 12 is provided with the radiation part 100, and the backward direction refers to the reverse direction of the forward direction. The reflecting plate 12 may be made of conductive materials such as copper, aluminum, etc., and similarly, the reflecting plate 12 may be made into a structure of a printed circuit board.

The supporting portion 200 serves to fixedly connect the radiating portion 100 and the reflecting plate 12, i.e., the radiating portion 100 may be fixed to the reflecting plate 12 through the supporting portion 200. The supporting portion 200 may be made of a conductive material such as copper, aluminum, or the like. The supporting portion 200 may be electrically connected with the reflecting plate 12, so that the reflecting plate 12 may be implemented as a reference ground of the radiating portion 100.

As a possible embodiment, the support 200 may include a first support section 201 and a second support section 202 connected to each other, and the first support section 201 and the second support section 202 may be disposed at an angle, and illustratively, the first support section 201 and the second support section 202 may be disposed perpendicular to each other. It will be appreciated that the first support section 201 and the second support section 202 may be disposed at other angles. The first end of the first support section 201 may be fixedly connected to the reflective plate 12, the second end of the first support section 201 may be connected to the first end of the second support section 202, and the second end of the second support section 202 may be connected to the radiation portion 100, thereby realizing the fixed connection of the radiation portion 100 to the reflective plate 12 through the support portion 200. Only the first end of the first supporting section 201 is connected to the reflective plate 12, which may be fixedly connected and electrically connected, so as to electrically connect the supporting portion 200 to the reflective plate 12, i.e. to realize grounding of the supporting portion 200. Only the first end of the first supporting section 201 is integrally connected with the reflecting plate 12, and the rest is suspended relative to the reflecting plate 12, and in specific implementation, the first end of the first supporting section 201 can have a bending structure, so that the length direction of the first supporting section 201, that is, the extending direction of the first supporting section 201, can be parallel to the reflecting plate 12, the space occupation of the supporting portion 200 can be reduced, and the miniaturization of the antenna structure is facilitated. The first supporting section 201 may be a sheet structure, the bending structure may be an extension of the sheet structure, and the height direction of the first supporting section 201 of the sheet structure may be perpendicular to the reflecting plate 12, which may be understood that the length direction of the first supporting section 201 may be parallel to the reflecting plate 12 at this time, that is, the height direction of the first supporting section 201 may be perpendicular to the reflecting plate 12 and the length direction may be parallel to the reflecting plate 12 when specifically arranged. Similarly, the second support section 202 may also be a sheet-like structure, and the length direction of the second support section 202 may be disposed perpendicular to the reflective plate 12.

The supporting portion 200 may be provided with a transmission belt line 300, and the transmission belt line 300 is electrically connected to the feed network and the radiating portion 100, respectively, to enable signals to be fed from the feed network to the radiating portion 100, so that the radiating portion 100 may radiate the fed signals into free space, and to enable signals received from the free space by the radiating portion 100 to be fed to the feed network. The supporting portion 200 has the function of supporting the transmission belt line 300 in addition to the function of fixedly connecting the radiation portion 100 and the reflection plate 12, that is, the supporting portion 200 can be used as a supporting structure of the transmission belt line 300 to realize the erection of the transmission belt line 300. Illustratively, the transmission line 300 may be disposed along the length direction of the first support section 201 and extend to the second support section 202, and then disposed along the length direction of the second support section 202, so as to be electrically connected to the radiation portion 100. In addition, the supporting portion 200 may also serve as an electrical reference ground for the transmission belt line 300. In particular, the transmission belt line 300 may be disposed on the side wall of the support portion 200, and for example, when the first support section 201 and the second support section 202 are of a sheet-like structure, the transmission belt line 300 may be disposed on the side wall of the first support section 201 and the second support section 202, that is, the transmission belt line 300 may be disposed on the side wall of both sides of the first support section 201 and the second support section 202 in the length direction.

In a specific implementation, the supporting portion 200 may be provided with a connection medium, and the transmission belt line 300 may be fixedly connected to the supporting portion 200 through the connection medium. The connection medium may be a non-conductive medium, such as rubber, between the transmission line 300 and the support 200, so as to electrically isolate the transmission line 300 from the support 200. In practical use, the transmission belt 300 may be disposed on one side of the supporting portion 200, and in combination with the above, the transmission belt 300 may be fixedly connected to one side of the first supporting section 201, and the transmission belt 300 extends from the first supporting section 201 to the second supporting section 202 and is fixedly connected to one side of the second supporting section 202. Alternatively, as shown in fig. 5, the transmission belt lines 300 may be disposed on opposite sides of the support portion 200, that is, the opposite sides of the support portion 200 may be provided with the transmission belt lines 300, and the dotted line in fig. 5 represents the transmission belt lines 300 disposed on the rear side of the support portion 200 in the drawing, and in particular, the transmission belt lines 300 may be disposed on opposite sides of the first support section 201 and the second support section 202, which may be specifically determined according to actual use requirements.

As a possible embodiment, the support part 200 may further be provided with a choke branch 400, and the choke branch 400 may be fixedly connected with the support part 200. The choke dendrite 400 may be made of conductive material such as copper, aluminum, etc., so that the choke dendrite 400 and the supporting part 200 may be electrically connected on the basis of fixed connection. It is understood that the choke trim 400 may be made of the same material as the support portion 200. The choke dendrite 400 is provided such that the supporting part 200 has a higher impedance dendrite. By arranging the choke branch 400 on the supporting portion 200, parasitic current generated by the supporting portion 200 in an operating frequency band of the antenna structure can be restrained, influence of the parasitic current on the radiating portion 100 is weakened, and balance of current distribution on the radiating portion 100 can be kept, so that a directional diagram of the antenna itself can be improved, radiation performance of the antenna can be improved, and antenna gain in the operating frequency band can be improved. In addition, in this embodiment, the choke branch 400 is disposed on the supporting portion 200 to inhibit parasitic current generated on the supporting portion 200, so as to improve the pattern of the antenna, and compared with the pattern of the antenna improved by externally connecting an additional debugging member, the structure complexity of the antenna can be improved, and the manufacturing cost of the antenna can be reduced.

In implementations, the choke dendrites 400 may be bar-shaped structures. The choke dendrite 400 of the bar structure can realize suppression of parasitic current generated on the supporting part 200 with less space occupation. In a specific application, the length direction of the choke dendrite 400 may be perpendicular to the length direction of the supporting portion 200, and the length direction of the choke dendrite 400 may be perpendicular to the extending direction of the transmission line 300. When the transmission belt line 300 extends in the length direction of the choke dendrite 400, the choke dendrite 400 may be implemented to be perpendicular to both the length direction of the supporting part 200 and the extending direction of the transmission belt line 300. It is understood that the length direction of the choke plug 400 may be disposed at other angles with respect to the length direction of the supporting portion 200.

The choke dendrite 400 is connected to the supporting part 200 along a first end in a length direction, and the choke dendrite 400 extends away from the supporting part 200 along a second end in the length direction. When the length direction of the choke dendrite 400 is perpendicular to the length direction of the supporting portion 200, the length of the choke dendrite 400 may be regarded as the height of the choke dendrite 400 extending with respect to the supporting portion 200, and when the length direction of the choke dendrite 400 forms other angles with the length direction of the supporting portion 200, the distance between the second end of the choke dendrite 400 and the supporting portion 200 may be regarded as the height of the choke dendrite 400. In particular implementations, the height of the choke dendrite 400 may be less than or equal to 1/10 of the operating wavelength of the antenna structure. When the length direction of the choke dendrite 400 is perpendicular to the length direction of the supporting part 200, the length of the choke dendrite 400 may be short, so that not only the space occupation of the choke dendrite 400 may be reduced, but also the cost of the antenna structure may be reduced.

For the case where the length direction of the choke dendrite 400 is perpendicular to the length direction of the supporting part 200, various implementations may be applied, and illustratively, the length direction of the choke dendrite 400 may be perpendicular to the reflecting plate 12, or the length direction of the choke dendrite 400 may be at other angles with the reflecting plate 12, or the length direction of the choke dendrite 400 may be parallel to the reflecting plate 12. In the case where the length direction of the choke dendrite 400 is disposed perpendicular to the reflection plate 12, specifically, the choke dendrite 400 may extend in a direction away from the reflection plate 12; alternatively, the choke dendrite 400 may extend toward the reflective plate 12, and in this case, the choke dendrite 400 may pass through the reflective plate 12, and it may be understood that a through hole may be correspondingly formed in the reflective plate 12, and the choke dendrite 400 may pass through the reflective plate 12 by the through hole.

Fig. 6 shows a schematic structural diagram of a choke branch 400 of an antenna structure provided in an embodiment of the present application, fig. 7 shows another schematic structural diagram of the choke branch 400 of the antenna structure provided in an embodiment of the present application, and fig. 8 shows yet another schematic structural diagram of the choke branch 400 of the antenna structure provided in an embodiment of the present application. As shown in fig. 6, in actual use, the second end of the choke dendrite 400 may be provided with an extension 401, and the extension 401 may be fan-shaped. Alternatively, as shown in fig. 7, the extension 401 may be triangular in shape; as shown in fig. 8, the extension 401 may also be circular in shape. The arrangement of the extension part 401 can increase the width of the choke branch 400, so that the bandwidth of the choke branch 400 can be enlarged, the choke branch 400 can cover the bandwidth of the parasitic current more easily, and the choke branch 400 can play a role in inhibiting the parasitic current on a wider frequency band. In addition, the arrangement of the extension part 401 can improve the overall impedance of the choke branch 400, and can reduce the influence of the choke branch 400 on other antennas in the base station antenna array. It will be appreciated that the extension 401 may have other shapes than the ones mentioned above, which are not limited in this application.

Fig. 9 shows another schematic structural diagram of the antenna structure provided in the embodiment of the present application, and fig. 9 illustrates a case where the shape of the extension 401 is a sector. As shown in fig. 9, as one possible embodiment, the number of choke dendrites 400 may be plural, the plural choke dendrites 400 may be disposed on the supporting part 200 at intervals, and the plural choke dendrites 400 may be disposed side by side along the length direction of the supporting part 200. Each choke branch 400 of the plurality of choke branches 400 functions to suppress generation of parasitic current, and the provision of the plurality of choke branches 400 as a whole can enhance the suppression of generation of parasitic current. In connection with the above, when the supporting part 200 includes the first supporting section 201 and the second supporting section 202 connected to each other, the plurality of choke knots 400 may have various arrangements, and for example, a part of the choke knots 400 may be arranged on the first supporting section 201 side by side along the length direction of the first supporting section 201, and another part of the choke knots 400 may be arranged on the second supporting section 202 side by side along the length direction of the second supporting section 202; alternatively, all of the choke knots 400 may be arranged on the first support section 201 side by side along the length of the first support section 201; alternatively, all of the choke knots 400 may be disposed on the second support section 202 side by side along the length of the second support section 202. Fig. 9 shows a case where a part of the choke dendrite 400 is provided on the first support section 201 and another part of the choke dendrite 400 is provided on the second support section 202. The choke knots 400 arranged side by side on the first support section 201 may be perpendicular to the length direction of the first support section 201; the choke dendrites 400 disposed side by side on the second support section 202 may be perpendicular to the length direction of the second support section 202, or, in consideration of the larger area of the second end of the choke dendrites 400 due to the disposition of the extension portion 401, the first end and the section near the first end of the choke dendrites 400 may be perpendicular to the length direction of the second support section 202, and the second end and the section near the second end of the choke dendrites 400 may be bent away from the reflection plate 12.

The plurality of choke dendrites 400 may be disposed at intervals, and for the entire plurality of choke dendrites 400, the gap between adjacent choke dendrites 400 is one of the reasons why the entire plurality of choke dendrites 400 have a high impedance, and can enhance suppression of generation of parasitic current. In particular implementations, the spacing between adjacent choke branches 400 may be less than or equal to 1/10 of the operating wavelength of the antenna structure.

In a specific implementation, regarding a manner of electrically connecting the choke dendrite 400 and the supporting portion 200, the choke dendrite 400 may be directly connected to the supporting portion 200 to achieve electrical connection; alternatively, the choke dendrite 400 may be coupled to the supporting part 200 to achieve electrical connection, and in particular, the choke dendrite 400 may be connected to the supporting part 200 at a relatively short distance through a medium. When the choke dendrite 400 is coupled to the supporting part 200, a capacitive effect may be provided between the choke dendrite 400 and the supporting part 200, and a reactance between the choke dendrite 400 and the supporting part 200 is relatively large, so that the choke dendrite 400 may be miniaturized, which is advantageous for simplifying an antenna structure and reducing a cost.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application.

Claims

1. An antenna structure, characterized by including radiation portion, supporting part, reflecting plate, transmission band line and choke branch, wherein:

the radiation part is arranged on the reflecting plate through the supporting part and is used for receiving signals or radiating signals;

the transmission belt line is arranged on the supporting part and is respectively and electrically connected with the feed network and the radiation part, and the transmission belt line is used for feeding signals between the feed network and the radiation part;

the choke branch is arranged on the supporting part and is electrically connected with the supporting part, and is used for inhibiting parasitic current from generating on the supporting part.

2. The antenna structure of claim 1, wherein the choke dendrites are bar-shaped structures.

3. The antenna structure according to claim 1 or 2, wherein a first end of the choke branch in a length direction is connected to the support portion, and a second end of the choke branch in the length direction extends in a direction away from the support portion;

the choke branch is provided with an extension portion along the second end of the length direction, and the extension portion is triangular, fan-shaped or circular.

4. An antenna structure according to any one of claims 1 to 3, wherein the length direction of the choke branch is arranged perpendicular to the extending direction of the transmission line.

5. The antenna structure of any one of claims 1-4, wherein the number of choke branches is plural, and the plural choke branches are arranged at intervals.

6. The antenna structure according to any one of claims 1 to 5, wherein the support portion comprises a first support section and a second support section connected to each other, the first support section and the second support section being disposed at an angle;

the first end of the first support section is connected with the reflecting plate, the second end of the first support section is connected with the first end of the second support section, and the second end of the second support section is connected with the radiation part.

7. The antenna structure according to any one of claims 1 to 6, characterized in that the support portion is provided with a connection medium, and the transmission strip line is fixedly connected to the support portion through the connection medium.

8. An antenna structure according to any one of claims 1 to 7, wherein the transmission strip lines are provided on opposite sides of the support.

9. A base station antenna comprising one or more antenna structures according to any one of claims 1 to 8 for receiving or transmitting electromagnetic waves.

10. A base station comprising one or more base station antennas as claimed in claim 9.