Multi-band antenna and communication equipment

Abstract

The utility model provides a multi-band antenna and a communication device, and relates to the technical field of communication, and the multi-band antenna comprises a housing, a radiation assembly arranged in the housing, and a connection part arranged outside the housing. The radiation assembly comprises a substrate, a plurality of first radiation units and a plurality of second radiation units, wherein the first radiation units and the second radiation units are arranged on the substrate. The working frequency of the first radiation units is larger than that of the second radiation units. The first radiation unit and the second radiation unit are arranged on the substrate according to a preset arrangement mode, and the connecting part is used for installing the multi-band antenna at a preset position, so that the output port of one or more radiation arrays is connected with the antenna feeder interface at the preset position, and multi-band output is realized. According to the multi-band antenna and the communication equipment provided by the utility model, multi-band output can be realized, so that the overall performance of the multi-band antenna is ensured, the overall complexity and weight of the multi-band antenna can be reduced, and the multi-band antenna and the communication equipment are convenient to deploy and install on a base station.

Description

Technical Field

[0001] The utility model relates to the technical field of communication, in particular to a multi-band antenna and communication equipment. Background Art

[0002] With the continuous development of communication technology, the use of base station antennas is increasing. The increase in operator construction costs has made the resources for base station site selection increasingly tight. Multi-port, multi-standard antennas can greatly save antenna space, construction resources, and maintenance costs. Therefore, multi-port, multi-standard antennas have become the mainstream.

[0003] However, the frequency band coverage of the multi-port multi-standard antenna used in the related art is relatively low, or, in order to meet the multi-standard requirements, the antenna structure is relatively complex and heavy, making it difficult to deploy on the base station. Utility Model Content

[0004] In view of this, an object of the present invention is to provide a multi-band antenna and a communication device to alleviate the above technical problems.

[0005] In a first aspect, an embodiment of the utility model provides a multi-band antenna, comprising: a shell, a radiating component arranged inside the shell, and a connecting portion arranged outside the shell; the radiating component comprises a substrate, and a plurality of first radiating units and a plurality of second radiating units arranged on the substrate, wherein the operating frequency of the first radiating unit is greater than the operating frequency of the second radiating unit; the first radiating units and the second radiating units are arranged on the substrate in a preset arrangement to form a plurality of radiating arrays, each of the radiating arrays comprising a preset number of first radiating units or a preset number of second radiating units; each of the radiating arrays is configured with an output port, and the output port is arranged on the connecting portion; the connecting portion is used to install the multi-band antenna at a preset position, so that the output ports of one or more of the radiating arrays are connected to the antenna feeder interface at the preset position to achieve multi-band output.

[0006] In combination with the first aspect, an embodiment of the utility model provides a first possible implementation of the first aspect, wherein the above-mentioned substrate is a rectangular substrate, the shell is a cylindrical shell, and the rectangular substrate is arranged in the cavity of the cylindrical shell; the connecting part is arranged on one of the end faces of the cylindrical shell and is connected to the substrate; the other end face of the cylindrical shell is provided with a decorative structure.

[0007] In combination with the first possible implementation of the first aspect, an embodiment of the utility model provides a second possible implementation of the first aspect, wherein the above-mentioned second radiation units are arranged in sequence along the longitudinal axis direction of the substrate, and a preset number of the second radiation units constitute a plurality of second radiation arrays; each of the second radiation units corresponds to a plurality of the first radiation units.

[0008] In combination with the second possible implementation of the first aspect, an embodiment of the utility model provides a third possible implementation of the first aspect, wherein a first isolation strip is also provided on the above-mentioned rectangular substrate, and the first isolation strip is provided along the longitudinal direction of the rectangular substrate, and corresponds to the longitudinal axial direction of the rectangular substrate; the first radiation units are sequentially arranged on both sides of the first isolation strip, and a preset number of the first radiation units constitute a plurality of first radiation arrays on both sides of the first isolation strip, and the first isolation strip is used to adjust the radiation pattern performance of the first radiation array.

[0009] In combination with the third possible implementation of the first aspect, the embodiment of the utility model provides a fourth possible implementation of the first aspect, wherein the radiation surface of the above-mentioned second radiation unit is superimposed and arranged above the first isolation strip, and the height of the radiation surface of the second radiation unit is higher than the height of the isolation strip so as to separate the radiation surface from the first isolation strip.

[0010] In combination with the second possible implementation of the first aspect, an embodiment of the utility model provides a fifth possible implementation of the first aspect, wherein the above-mentioned multi-band antenna also includes at least one second isolation strip; the second isolation strip is arranged between two adjacent second radiation units, for coupling two adjacent second radiation units; wherein the length direction of the second isolation strip is arranged along the lateral direction of the rectangular substrate.

[0011] In combination with the second possible implementation of the first aspect, an embodiment of the utility model provides a sixth possible implementation of the first aspect, wherein the above-mentioned multi-band antenna also includes at least one third isolation strip; the third isolation strip is arranged at a position corresponding to the first radiation unit, for adjusting the isolation degree of the first radiation unit.

[0012] In combination with the first aspect, the embodiment of the utility model provides a seventh possible implementation of the first aspect, wherein the second radiation unit is a filtering radiation unit, and the radiation surface of the second radiation unit has a filtering circuit.

[0013] In combination with the first possible implementation manner of the first aspect, the embodiment of the utility model provides an eighth possible implementation manner of the first aspect, wherein the above-mentioned cylindrical shell is a cylindrical shell.

[0014] In a second aspect, an embodiment of the present utility model further provides a communication device, wherein the communication device is configured with the multi-band antenna described in the first aspect.

[0015] The embodiments of the present invention bring the following beneficial effects:

[0016] A multi-band antenna and communication equipment are provided in an embodiment of the utility model. The radiation component in the multi-band antenna includes a plurality of first radiation units and a plurality of second radiation units. The first radiation units and the second radiation units are arranged on a substrate in a preset arrangement to form a plurality of radiation arrays. Each radiation array includes a preset number of first radiation units or a preset number of second radiation units. Each radiation array is configured with an output port, and the output port is arranged on a connecting portion. The connecting portion is used to install the multi-band antenna at a preset position, so that the output port of one or more radiation arrays is connected to the antenna feeder interface at the preset position to achieve multi-band output. Since the operating frequencies of the first radiation unit and the second radiation unit are different, the above-mentioned multiple radiation arrays can obtain the frequency ranges of multiple antennas of different standards, thereby ensuring the overall performance of the multi-standard antenna. At the same time, the first radiation unit and the second radiation unit are arranged on the substrate in a preset arrangement, which can reduce the overall complexity and weight of the multi-band antenna, thereby facilitating deployment and installation on the base station.

[0017] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures specifically pointed out in the description, claims and drawings.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A structural block diagram of a multi-band antenna provided by an embodiment of the utility model;

[0021] Figure 2 A schematic diagram of the structure of a multi-band antenna provided by an embodiment of the utility model;

[0022] Figure 3 A schematic diagram of the structure of a third isolation strip provided in an embodiment of the utility model;

[0023] Figure 4 A top view of a second radiation unit provided in an embodiment of the utility model;

[0024] Figure 5 A top view of a first radiation unit provided in an embodiment of the utility model.

[0025] Icon: 10-shell; 20-radiation component; 30-connecting part; 40-decorative structure; 201-substrate; 202-first radiation unit; 203-second radiation unit; 204-first isolation strip; 205-second isolation strip; 206-third isolation strip; 207-RF coaxial connector; 31-first bending part; 32-second bending part. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0027] At present, with the continuous development of communication technology, the use of base station antennas is increasing. The increase in construction costs of operators has made the resources for base station site selection increasingly tight. Multi-port, multi-standard antennas can greatly save antenna space, construction resources, and maintenance costs. Therefore, small-sized multi-port, multi-standard antennas have become the mainstream.

[0028] Based on this, the embodiments of the present invention provide a multi-band antenna and communication equipment, which can realize multi-port and multi-standard, and are easy to deploy and install on the base station.

[0029] To facilitate understanding of this embodiment, a multi-band antenna disclosed in an embodiment of the utility model is first introduced in detail.

[0030] In a possible implementation, an embodiment of the utility model provides a multi-band antenna. Specifically, the multi-band antenna in the embodiment of the utility model includes: a shell, a radiation component arranged inside the shell, and a connecting portion arranged outside the shell.

[0031] For ease of understanding, Figure 1 A structural block diagram of a multi-band antenna is shown, Figure 1 As shown, the housing 10, the radiation component 20 and the connecting portion 30 are shown respectively.

[0032] The radiation component 20 includes a substrate 201 , and a plurality of first radiation units 202 and a plurality of second radiation units 203 disposed on the substrate, wherein the operating frequency of the first radiation unit 202 is greater than the operating frequency of the second radiation unit 203 .

[0033] The first radiation unit 202 and the second radiation unit 203 are arranged on the substrate 201 in a preset arrangement to form a plurality of radiation arrays, each of which includes a preset number of first radiation units or a preset number of second radiation units; and each radiation array is configured with an output port ( Figure 1 The output port is provided on the connection portion.

[0034] In specific implementation, the connecting part is used to install the multi-band antenna at a preset position, such as on a floor or a base station's elevated frame, so that the output ports of one or more radiating arrays are connected to the antenna feeder interface at the preset position to achieve multi-band output.

[0035] A multi-band antenna provided by an embodiment of the utility model comprises a radiation component in the multi-band antenna comprising a plurality of first radiation units and a plurality of second radiation units, the first radiation units and the second radiation units are arranged on a substrate in a preset arrangement to form a plurality of radiation arrays, each radiation array comprising a preset number of first radiation units or a preset number of second radiation units; each radiation array is configured with an output port, the output port is arranged on a connecting portion, the connecting portion is used to install the multi-band antenna at a preset position, so that the output port of one or more radiation arrays is connected to the antenna feeder interface at the preset position to achieve multi-band output, since the operating frequencies of the first radiation unit and the second radiation unit are different, the above-mentioned multiple radiation arrays can obtain the frequency ranges of multiple antennas of different standards, thereby ensuring the overall performance of the multi-standard antenna, and at the same time, arranging the first radiation unit and the second radiation unit on the substrate in a preset arrangement can reduce the overall complexity and weight of the multi-band antenna, thereby facilitating deployment and installation on a base station.

[0036] In actual use, the above-mentioned substrate in the embodiment of the utility model is a rectangular substrate, the above-mentioned shell is a cylindrical shell, the rectangular substrate is arranged in the cavity of the cylindrical shell; and the connecting part is arranged on one of the end faces of the cylindrical shell and connected to the substrate; the other end face of the cylindrical shell is provided with a decorative structure.

[0037] Furthermore, the above-mentioned cylindrical shell is usually a cylindrical shell, and because a device structure is provided on one end surface of the cylindrical shell, the multi-band antenna provided by the embodiment of the utility model is actually a beautified multi-band multi-port antenna.

[0038] For ease of understanding, Figure 1 On the basis of Figure 2 A schematic diagram of the structure of a multi-band antenna is shown, wherein, for the sake of convenience of explanation, in the embodiment of the utility model, a cylindrical shell is taken as an example for explanation, therefore, the corresponding connecting parts and device structures arranged at both ends of the cylindrical shell are circular structures, and the diameter of the cylindrical shell can be set according to actual usage conditions, and the embodiment of the utility model does not limit this.

[0039] Specific as Figure 2 As shown, it includes a substrate 201, and a connecting portion 30 and a decorative structure 40 at two end surfaces of a cylindrical shell of the substrate, wherein, for the convenience of description, Figure 2 In the figure, the specific shape of the shell is hidden, and the structural schematic diagram of the internal radiation component is directly shown.

[0040] Typically, the connection portion is configured in the form of a flange, ie, a circular flange, for installing or fixing the multi-band antenna.

[0041] In actual use, the above-mentioned substrate is also called a slot plate, and based on the above-mentioned rectangular substrate, the above-mentioned second radiation units are arranged in sequence along the longitudinal axis direction of the substrate, and a preset number of second radiation units constitute a plurality of second radiation arrays; each second radiation unit corresponds to a plurality of first radiation units.

[0042] Specifically, Figure 2 As shown, on the rectangular substrate, the second radiation units 203 are arranged in sequence along the longitudinal axis and in the longitudinal center, and each second radiation unit 203 corresponds to four first radiation units 202, that is, the four first radiation units 202 are arranged around the second radiation unit 203.

[0043] Furthermore, a first isolation strip 204 is also provided on the rectangular substrate. The first isolation strip is provided along the longitudinal direction of the rectangular substrate and corresponds to the longitudinal axial direction of the rectangular substrate. In an embodiment of the utility model, the first isolation strip is directly provided at the central position of the rectangular substrate along the longitudinal direction, and the first radiation units 202 are sequentially provided on both sides of the first isolation strip 204, and a plurality of first radiation arrays are formed by a preset number of first radiation units on both sides of the first isolation strip 204, and the first isolation strip 204 is used to adjust the directional pattern performance of the first radiation array.

[0044] For ease of explanation, Figure 2 The embodiment shown is 8 second radiation units and 32 first radiation units, Figure 2 It can be seen that two rows of first radiation units are respectively arranged on both sides of the first isolation strip, and a row of second radiation units is arranged in the center of the rectangular substrate along the above-mentioned axial direction.

[0045] It should be understood that in the embodiments of the present utility model, Figure 2 The number and array of the first radiation unit and the second radiation unit included in the multi-band antenna shown is only one possible implementation. In other implementations, the number and arrangement of the first radiation unit and the second radiation unit may also have other forms, which shall be based on actual usage. The embodiments of the utility model are not limited to this.

[0046] Further, as shown in FIG. 2 , the radiation surface of the second radiation unit 203 is superimposed on the first isolation strip 204 , and the height of the radiation surface of the second radiation unit 203 is higher than the height of the first isolation strip, so that the radiation surface is separated from the first isolation strip.

[0047] Further, if Figure 2 As shown, the multi-band antenna in the embodiment of the utility model further includes at least one second isolation strip 205. The second isolation strip 205 is arranged between two adjacent second radiation units 203, and is used to couple the two adjacent second radiation units 203; wherein the length direction of the second isolation strip 205 is arranged along the lateral direction of the rectangular substrate.

[0048] Further, if Figure 2 As shown, the multi-band antenna in the embodiment of the utility model further includes at least one third isolation strip 206 , which is disposed at a position corresponding to the first radiation unit 202 and is used to adjust the isolation degree of the first radiation unit 202 .

[0049] Specifically, Figure 3 A schematic diagram of the structure of a third isolation strip is also shown. Figure 2 The position of the third isolation strip shown in FIG. Figure 3 As shown, the third isolation strip is a bending structure, including a first bending portion 31 and a second bending portion 32, the first bending portion 31 and the second bending portion 32 are arranged at right angles, and the first bending portion 31 is provided with a mounting hole for mounting the third isolation strip on the substrate, and when the third isolation strip is mounted on the substrate, the surface of the second bending portion is close to the radiation surface of the first radiation unit 202, so as to play a role in adjusting the isolation degree.

[0050] In a specific implementation, the second isolation bar 205 and the third isolation bar 206 can be set according to actual use requirements, that is, one or more second isolation bars 205 and the third isolation bar 206 can be set. For the sake of convenience, Figure 2 In the figure, only one third isolation strip 206 and a plurality of second isolation strips 205 are shown. The specific number of the second isolation strips and the third isolation strips can be set according to actual usage, and the embodiment of the utility model is not limited to this.

[0051] Furthermore, the second radiation unit in the embodiment of the utility model is a filtering radiation unit, and the radiation surface of the second radiation unit has a filtering circuit.

[0052] further, Figure 4 A top view of a second radiation unit is also shown, and Figure 5 A top view of a first radiation unit is shown, Figure 4 and Figure 5 It can be seen that the first radiation unit and the second radiation unit are both provided with radiation surfaces, and the first radiation unit, the second radiation unit, and the first isolation strip 204, the second isolation strip 205 and the third isolation strip 206 constitute the main part of the multi-band antenna, and the main part and the decorative structure 40 can be connected to the ground through a lightning conductor to achieve a lightning protection effect.

[0053] In actual use, the operating frequency of the above-mentioned first radiation unit is usually 1710-2690MHz, which is a medium frequency operating frequency, and the operating frequency of the second radiation unit with a filtering circuit is 698-960MHz, which is a low frequency operating frequency. Therefore, the above-mentioned first radiation unit in the embodiment of the utility model is also called a medium frequency radiation unit, and the above-mentioned second radiation unit with a filtering circuit is also called a low-frequency filtering radiation unit.

[0054] Furthermore, when the first radiation units are arranged on the substrate, the spacing between two adjacent first radiation units is between 0.7 and 0.9 of the center frequency wavelength. The spacing between two adjacent second radiation units is also usually set between 0.7 and 0.9 of the center frequency wavelength, and the radiation surface of the second radiation unit has a filtering circuit that has little effect on the performance of the intermediate frequency first radiation unit. Therefore, multiple intermediate frequency first radiation units can be arranged around the low frequency second radiation unit.

[0055] Further, based on Figure 2 The multi-band antenna shown in the figure, the plurality of first radiation arrays formed by the first radiation units refer to Figure 2 The radiation array composed of 32 first radiation units, for example, can be divided into four first radiation arrays, each of which includes eight first radiation units, such as for the substrate, which is equivalent to four first radiation arrays of top, bottom, left and right. At the same time, the eight second radiation units are divided into two second radiation arrays, and each four second radiation units constitute a second radiation array.

[0056] In this way, based on Figure 2The multi-band antenna shown includes 6 radiating arrays. The 6 radiating arrays are combined, such as a single first radiating array, a single second radiating array, or a combination of one or more first radiating arrays and one or more second radiating arrays, etc., to form 12 types of antennas. At this time, each radiating array, or the array formed by the combination, can be configured with an output port corresponding to it and extend to the above-mentioned connection portion, that is, Figure 3 The enlarged schematic diagram shows a radio frequency coaxial connector 207 corresponding to each output port. By connecting different radio frequency coaxial connectors 207 to external antenna feeder connectors, multi-band output can be achieved.

[0057] It should be understood that the number of first radiation units included in the above-mentioned first radiation array and the number of second radiation units included in the second radiation array can also be set according to actual usage conditions, and the embodiments of the present utility model do not limit this.

[0058] In summary, the multi-band antenna provided by the embodiment of the utility model can increase the low-frequency part of its operating frequency from the commonly used 885MHz~960MHz to 698MHz~960MHz, and the medium frequency can be increased from the commonly used 1710MHz~2170MHz to 1710MHz~2690MHz, which helps to improve the spectrum range of the antenna. In addition, by using a second radiating unit (low-frequency filtering radiating unit) with a filtering circuit, the mutual coupling between low and medium frequencies can be effectively reduced, and the medium frequency radiating unit and the low frequency radiating unit can be re-arrayed, so that the antenna can be placed in two columns of medium frequency radiating units (first radiating units) under the original size. A column of low-frequency filtering radiating units (second radiating units) is placed in the original size, achieving full nesting, which not only increases the number of medium frequency ports, but also ensures the overall performance of the antenna, reduces the weight, and enables operators to more conveniently achieve the low-cost requirements for base station establishment and achieve better deep network coverage.

[0059] Furthermore, based on the above embodiment, an embodiment of the utility model also provides a communication device, which is equipped with the above multi-band antenna.

[0060] The communication device provided in the embodiment of the utility model has the same technical features as the multi-band antenna provided in the above embodiment, so it can also solve the same technical problems and achieve the same technical effects.

[0061] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the communication device described above can refer to the corresponding process in the aforementioned embodiment, and will not be repeated here.

[0062] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0064] Finally, it should be noted that the above embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A multi-band antenna, characterized in that: The multi-band antenna comprises: a shell, a radiation component arranged inside the shell, and a connecting portion arranged outside the shell; The radiation component includes a substrate, and a plurality of first radiation units and a plurality of second radiation units arranged on the substrate, wherein the operating frequency of the first radiation unit is greater than the operating frequency of the second radiation unit; The first radiation units and the second radiation units are arranged on the substrate in a preset arrangement to form a plurality of radiation arrays, each of the radiation arrays including a preset number of first radiation units or a preset number of second radiation units; Each of the radiation arrays is configured with an output port, and the output port is arranged on the connecting portion; The connecting portion is used to install the multi-band antenna at a preset position, so that one or more output ports of the radiation array are connected to the antenna feeder interface at the preset position to achieve multi-band output.

2. The multi-band antenna according to claim 1, characterized in that: The substrate is a rectangular substrate, the shell is a cylindrical shell, and the rectangular substrate is arranged in the cavity of the cylindrical shell; The connecting portion is arranged on one end surface of the cylindrical shell and is connected to the substrate; the other end surface of the cylindrical shell is provided with a decorative structure.

3. The multi-band antenna according to claim 2, characterized in that: The second radiation units are arranged in sequence along the longitudinal axis direction of the substrate, and a preset number of the second radiation units constitute a plurality of second radiation arrays; Each of the second radiation units corresponds to a plurality of the first radiation units.

4. The multi-band antenna according to claim 3, characterized in that: A first isolation strip is also provided on the rectangular substrate, and the first isolation strip is provided along the longitudinal direction of the rectangular substrate and corresponds to the longitudinal axial direction of the rectangular substrate; The first radiation units are sequentially arranged on both sides of the first isolation strip, and a preset number of the first radiation units on both sides of the first isolation strip constitute a plurality of first radiation arrays, and the first isolation strip is used to adjust the directivity performance of the first radiation array.

5. The multi-band antenna according to claim 4, characterized in that: The radiation surface of the second radiation unit is superimposed on the first isolation strip, and the height of the radiation surface of the second radiation unit is higher than the height of the first isolation strip, so that the radiation surface is separated from the first isolation strip.

6. The multi-band antenna according to claim 3, characterized in that: The multi-band antenna further comprises at least one second isolation strip; The second isolation strip is disposed between two adjacent second radiation units, and is used to couple the two adjacent second radiation units; Wherein, the length direction of the second isolation strip is arranged along the lateral direction of the rectangular substrate.

7. The multi-band antenna according to claim 3, characterized in that: The multi-band antenna further comprises at least one third isolation strip; The third isolation strip is disposed at a position corresponding to the first radiation unit, and is used to adjust the isolation degree of the first radiation unit.

8. The multi-band antenna according to claim 1, characterized in that: The second radiation unit is a filtering radiation unit, and a radiation surface of the second radiation unit is provided with a filtering circuit.

9. The multi-band antenna according to claim 2, characterized in that: The cylindrical shell is a cylindrical shell.

10. A communication device, characterized in that: The communication device is equipped with the multi-band antenna according to any one of claims 1 to 9.

Images