Mutual coupling suppression dual-frequency dual-polarized antenna and array antenna

Abstract

The embodiment of the invention relates to the technical field of mobile communication, and discloses a mutual coupling suppression dual-frequency dual-polarized antenna, which comprises a reflecting plate, and a low-frequency unit, a high-frequency unit and a separator which are arranged on the reflecting plate, the low-frequency unit and the high-frequency unit are separated by the separator; the low-frequency unit comprises four dipoles, each dipole comprises two oscillator arms which are mutually coupled, and the width of each oscillator arm is gradually increased from the feed end to the tail end to form a polygonal structure; the oscillator arms of the four dipoles are arranged in a surrounding manner to form a rhombus; the high-frequency unit comprises multiple layers of dielectric substrates, a feed network and an antenna patch, the feed network and the antenna patch are respectively arranged on different dielectric substrates, and symmetrical slots are formed in a radiating surface of the antenna patch. In this way, the wave beams of the high-frequency unit and the low-frequency unit are reduced, and high-frequency and low-frequency mutual coupling is restrained.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of mobile communication technology, and in particular to a mutual coupling suppression dual-frequency dual-polarization antenna and a mutual coupling suppression dual-frequency dual-polarization linear array antenna. Background Art

[0002] With the rapid development of mobile communications, the capacity and quality of communication systems are constantly being upgraded. In the entire communication system, the role of antennas has become more important, and the performance requirements for base station antennas have become increasingly higher. Among them, base station resources are limited, and antennas are required to support multi-system operations while reducing unnecessary increases in the number of antennas. Existing technical solutions use multi-band shared base station antennas to reduce the number of antennas, thereby reducing interference between antennas and site construction costs, and can share existing base stations.

[0003] The inventors of this application have discovered that with the development of mobile communication technology, base stations need to improve performance and integration while also meeting the needs of frequency diversification of different systems and miniaturization of antenna size. To this end, base station antennas that are shared by multiple systems with dual or even multiple frequency bands have ushered in application needs. However, in the existing technical solutions, the aperture sharing of antenna units in different frequency bands, the mutual coupling and cross-frequency scattering between units are realistic technical bottlenecks that cannot be avoided. This problem will seriously affect the overall performance and isolation indicators of the antenna.

[0004] In order to solve the technical problems of mutual coupling and cross-frequency scattering between existing antenna units, an embodiment of the present invention provides a mutual coupling suppression dual-frequency dual-polarization antenna and a mutual coupling suppression dual-frequency dual-polarization linear array antenna, which overcome the above problems or at least partially solve the above problems.

[0005] According to one aspect of an embodiment of the present invention, a mutual coupling suppression dual-frequency dual-polarization antenna is provided, the mutual coupling suppression dual-frequency dual-polarization antenna comprising a reflector and a low-frequency unit, a high-frequency unit and an isolator mounted on the reflector; the low-frequency unit and the high-frequency unit are separated by the isolator; the low-frequency unit comprises four dipoles, each of the dipoles comprises two mutually coupled dipole arms, each of the dipole arms has a polygonal structure with increasing width from the feeding end to the end; the dipole arms of the four dipoles are surrounded to form a rhombus; the high-frequency unit comprises a multi-layer dielectric substrate, a feeding network and an antenna patch, the feeding network and the antenna patch are respectively arranged on different dielectric substrates, and symmetrical slots are provided on the radiation surface of the antenna patch.

[0006] In an optional manner, the four dipoles are centrally symmetrical and orthogonally combined to form a polarization distribution of positive and negative 45 degrees.

[0007] In an optional manner, the vibrator arm is configured as a triangular cavity structure with a width increasing from the feeding end to the end.

[0008] In an optional manner, the dipole arm extends from the feeding end to the center of the low-frequency unit; or, the dipole arm extends from the feeding end to the outside of the low-frequency unit.

[0009] In an optional manner, the low-frequency unit includes a feeding balun for supporting the four dipoles, one end of the feeding balun is connected to the feeding end of the dipole arm of each dipole, and the other end extends toward the reflector and is fixedly connected to the reflector.

[0010] In an optional manner, the slot includes a cross-shaped slot located in the middle of the radiation surface of the antenna patch, and four long strip slots evenly distributed at four corners of the cross-shaped slot.

[0011] In an optional manner, the high-frequency unit further includes four centrally symmetrical feeding probes, and the antenna patch is provided with four corresponding feeding points; one end of the four feeding probes is respectively connected to the four feeding points, and the other end is connected to the reflector.

[0012] According to another aspect of an embodiment of the present invention, a mutual coupling suppression dual-frequency dual-polarization linear array antenna is provided, wherein the mutual coupling suppression dual-frequency dual-polarization linear array antenna comprises a reflector, at least one of the above-mentioned isolating elements, a plurality of the above-mentioned low-frequency units, and a plurality of the above-mentioned high-frequency units; a plurality of the low-frequency units are arranged on the reflector to form at least one low-frequency unit array, a plurality of the high-frequency units are arranged on the reflector to form at least one high-frequency unit array, and adjacent low-frequency unit arrays and high-frequency unit arrays are separated by an isolating element.

[0013] In an optional manner, the mutual coupling suppression dual-frequency dual-polarization linear array antenna includes three low-frequency unit arrays and two high-frequency unit arrays; each of the low-frequency unit arrays is provided with five low-frequency units, and each of the high-frequency unit arrays is provided with nine high-frequency units.

[0014] In an optional manner, the operating frequency bands of the mutually coupled dual-frequency dual-polarized linear array antenna include 1710-2700 MHz and 3300-3600 MHz.

[0015] On the one hand, the embodiment of the present invention adopts a rhombus oscillator unit composed of four dipoles arranged around the center to form a low-frequency unit. Compared with the cross oscillator, the rhombus oscillator unit has good beam convergence and higher gain. On the other hand, by adopting a high-frequency unit made of a multi-layer dielectric substrate, a feeding network and an antenna patch, the cross-sectional height of the high-frequency unit can be effectively reduced. Furthermore, symmetrical slits are formed on the radiation surface of the antenna patch to improve impedance and optimize isolation indicators. In this way, the embodiment of the present invention can reduce the beams of the high-frequency unit and the low-frequency unit to suppress high- and low-frequency mutual coupling.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 A schematic structural diagram of a mutual coupling suppression dual-frequency dual-polarization linear array antenna provided in an embodiment of the present invention is shown; Figure 2 A schematic diagram of the three-dimensional structure of a low-frequency unit provided by an embodiment of the present invention is shown; Figure 3 A front view of a low frequency unit provided by an embodiment of the present invention is shown; Figure 4 A bottom view of a low frequency unit provided by an embodiment of the present invention is shown; Figure 5 A schematic diagram of the three-dimensional structure of a high-frequency unit provided by an embodiment of the present invention is shown; Figure 6 A front view of a high frequency unit provided by an embodiment of the present invention is shown; Figure 7 A top view of a high frequency unit provided by an embodiment of the present invention is shown.

[0018] The reference numerals in the specific implementation manner are as follows: Reflection plate 100 , low frequency unit 110 , dipole 111 , oscillator arm 1111 , feeding pole 112 , fixing member 113 , high frequency unit 120 , dielectric substrate 121 , feeding probe 122 , slot 123 , cross slot 1231 , long strip slot 1232 , isolator 130 , port 140 . DETAILED DESCRIPTION

[0019] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention. Example

[0020] See also Figure 1 , Figure 1 The schematic diagram of the structure of the mutual coupling suppression dual-frequency dual-polarization linear array antenna provided in an embodiment of the present invention is shown. The mutual coupling suppression dual-frequency dual-polarization linear array antenna is at least partially composed of a mutual coupling suppression dual-frequency dual-polarization antenna, wherein the mutual coupling suppression dual-frequency dual-polarization antenna comprises a reflector 100, and a low-frequency unit 110, a high-frequency unit 120 and an isolator 130 mounted on the reflector 100, wherein the low-frequency unit 110 and the high-frequency unit 120 are separated by the isolator 130. It can be understood that the embodiment of the present invention does not specifically limit the number and orientation of the low-frequency unit 110, the high-frequency unit 120 and the isolator 130. In an optional manner, the low-frequency unit 110 and the high-frequency unit 120 are separated in the vertical direction by the isolator 130; in another optional manner, the low-frequency unit 110 and the high-frequency unit 120 are separated in the horizontal direction by the isolator 130.

[0021] The reflector 100 may also be referred to as a bottom plate, an antenna panel or a metal reflective surface, etc., and is used to reflect wireless signals. The embodiment of the present invention does not limit the specific material of the reflector 110 .

[0022] In the embodiments of the present invention, see Figure 2-4 , Figure 2 FIG. 4 shows a schematic diagram of the three-dimensional structure of a low-frequency unit provided by an embodiment of the present invention. Figure 3 shows a front view of a low frequency unit provided by an embodiment of the present invention, Figure 4 A bottom view of a low-frequency unit provided in an embodiment of the present invention is shown. As shown in the figure, the low-frequency unit 110 includes four dipoles 111, each of the dipoles 111 includes two dipole arms 1111 coupled to each other, and each of the dipole arms 1111 increases in width from the feeding end to the end to form a polygonal structure; the dipole arms 1111 of the four dipoles 111 are surrounded to form a rhombus.

[0023] In the embodiments of the present invention, see Figure 5-7 , Figure 5 FIG. 1 shows a schematic diagram of the three-dimensional structure of a high-frequency unit provided by an embodiment of the present invention. Figure 6 shows a front view of a high frequency unit provided by an embodiment of the present invention, Figure 7A top view of a high-frequency unit provided in an embodiment of the present invention is shown. The high-frequency unit 120 includes a multi-layer dielectric substrate 121, a feeding network (not shown in the figure) and an antenna patch (not shown in the figure). The feeding network and the antenna patch are respectively arranged on different dielectric substrates 121, and symmetrical slots 123 are opened on the radiation surface of the antenna patch; the feeding network is used to feed a signal to the antenna patch. Specifically, the feeding network can provide a specific power and phase to the antenna patch. For example, the feeding network can include a power divider (or combiner) that can be used in the forward direction or the reverse direction, and is used to divide one signal into multiple signals or combine multiple signals into one.

[0024] On the one hand, the embodiment of the present invention adopts a rhombus oscillator unit composed of four dipoles 111 arranged around the center to form a low-frequency unit 110. Compared with the cross oscillator, the rhombus oscillator unit has good beam convergence and higher gain. On the other hand, by adopting a high-frequency unit 120 made of a multi-layer dielectric substrate 121, a feeding network and an antenna patch, the cross-sectional height of the high-frequency unit 120 can be effectively reduced. Furthermore, symmetrical slits are formed on the radiation surface of the antenna patch to improve impedance and optimize isolation indicators. In this way, the embodiment of the present invention can reduce the beams of the high-frequency unit 120 and the low-frequency unit 110 to suppress high- and low-frequency mutual coupling.

[0025] In a specific implementation of the embodiment of the present invention, the four dipoles 111 are centrally symmetrical and orthogonally combined to form a polarization distribution of positive and negative 45 degrees, such as Figure 3 As shown, four dipoles 111 are distributed on the same plane, the opposite dipoles 111 form the same polarization, the adjacent dipoles 111 form different polarizations, and the two dipoles 111 of the same polarization are fed in parallel, and the feeding phases are in phase. Among them, one pair of opposite dipoles 111 presents negative 45-degree polarization, and the other pair of opposite dipoles presents positive 45-degree polarization. In the mobile communication system, positive and negative 45-degree polarization is preferably used as the wave transmission mode. For this reason, the embodiment of the present invention designs a 45-degree dual-polarization antenna.

[0026] In a specific implementation of the embodiment of the present invention, the vibrator arm 1111 is configured as a triangular cavity structure with a width increasing from the feeding end to the end. Figure 3As shown, the dipole arm 1111 extends from the feeding end to the center of the low-frequency unit 110. In another optional manner, the dipole arm 1111 extends from the feeding end to the outside of the low-frequency unit 110. It should be noted that in the design structure of the rhombus dipole unit, the impedance bandwidth depends on the bandwidth of a single dipole, and the shape of the two arms of the dipole is usually in a rod-shaped form. Therefore, the conventional dual-polarized rhombus dipole antenna has the problem of narrow impedance bandwidth, and the impedance bandwidth can only reach about 18% at present. In an embodiment of the present invention, the dipole arm 111 gradually widens from the feeding end to the end to form a triangular cavity structure, which widens the width of the dipole arm 1111 and widens the impedance bandwidth by increasing the coupling surface. In a specific manifestation of an embodiment of the present invention, when the standing wave ratio of the low-frequency unit 110 is less than 1.4, the impedance bandwidth reaches about 45%.

[0027] The low-frequency unit 110 includes a feeding balun 112 for supporting the four dipoles 111, one end of the feeding balun 112 is connected to the feeding end of the dipole arm 1111 of each dipole 111, and the other end extends toward the reflecting plate 100 and is fixedly connected to the reflecting plate 100, and the feeding balun 112 is used as a supporting structure for supporting the dipole arm 1111. Specifically, the feeding balun 112 is arranged at a certain angle with the reflecting plate 100 to ensure that the height between the dipole arm 1111 and the reflecting plate 100 remains unchanged, and the length of the feeding balun 112 is extended, thereby increasing the matching bandwidth.

[0028] In an optional manner, the low-frequency unit 110 includes a fixing member 113 for fixing the feeding balun 112 on the reflecting plate 100. Specifically, the fixing member 113 is installed on the reflecting plate 100, and one end of the feeding balun 112 is connected to the feeding end of the dipole arm 1111 of each of the dipoles 111, and the other end is connected to the fixing member 113. Preferably, the dipole 111, the feeding balun 112 and the fixing member 113 are integrated to reduce solder joints.

[0029] In a specific implementation of the embodiment of the present invention, the high frequency unit 120 adopts an air dielectric microstrip patch structure, which uses a dielectric microstrip transmission line for excitation and feeding. Figure 6 As shown, the slot 123 includes a cross-shaped slot 1231 disposed in the middle of the radiation surface of the antenna patch, and four long strip slots 1232 evenly distributed at the four corners of the cross-shaped slot 1231. The high-frequency unit 120 of the embodiment of the present invention adopts a microstrip patch structure, and the slots 123 are symmetrically provided on the radiation surface of the patch, which can improve the distribution of the patch's co-polarization current, suppress the cross-polarization current, improve the impedance, and thus improve the antenna isolation index.

[0030] Among them, see Figure 5, the high-frequency unit 120 also includes four centrally symmetrical feeding probes 122, and the antenna patch is provided with four corresponding feeding points; one end of the four feeding probes 122 is respectively connected to the four feeding points, and the other end is connected to the reflector 100. Optionally, the feeding probes 122 and the radiation surface of the antenna patch are processed in an integrated manner to reduce welding connection points; optionally, the four feeding probes 122 and the four long strip slots 1232 are set to be consistent in shape and size to facilitate processing. The high-frequency unit 120 provided in an embodiment of the present invention adopts probe feeding, and can excite the co-polarized resonant mode by adjusting the position of the feeding probes 122, wherein the relatively arranged feeding probes 122 are feeding probe structures of the same polarization, and the feeding probe structure of the same polarization adopts dual feeding point feeding, and the relatively arranged dual feeding points are fed with a phase difference of 180 degrees to improve the impedance bandwidth. Example

[0031] See also Figure 1 , Figure 1 A schematic structural diagram of a dual-frequency dual-polarized linear array antenna with mutual coupling suppression provided in an embodiment of the present invention is shown, wherein the dual-frequency dual-polarized linear array antenna with mutual coupling suppression includes a reflector 100, at least one isolator 130 as described in Example 1, a plurality of low-frequency units 110 as described in Example 1, and a plurality of high-frequency units 120 as described in Example 1; a plurality of low-frequency units 110 are arranged on the reflector 100 to form at least one low-frequency unit array, a plurality of high-frequency units 120 are arranged on the reflector 100 to form at least one high-frequency unit array, and adjacent low-frequency unit arrays and high-frequency unit arrays are separated by an isolator 130 to improve the lobe width and optimize the isolation index.

[0032] Among them, a low-frequency unit array specifically refers to an antenna unit array composed of multiple low-frequency units 110 arranged in a row, and a high-frequency unit array specifically refers to an antenna unit array composed of multiple high-frequency units 120 arranged in a row. In a specific implementation of an embodiment of the present invention, the mutual coupling suppression dual-frequency dual-polarization linear array antenna includes 3 low-frequency unit arrays and 2 high-frequency unit arrays, and the low-frequency unit arrays and the high-frequency unit arrays are staggered, that is, the two high-frequency unit arrays are respectively arranged between adjacent low-frequency unit arrays; and the adjacent low-frequency unit arrays and high-frequency unit arrays are separated by an isolation member 130, preferably, the spacing between adjacent low-frequency unit arrays and high-frequency unit arrays is consistent. Among them, each of the low-frequency unit arrays is provided with 5 low-frequency units 110, and the 5 low-frequency units 110 are arranged at equal intervals, and each of the high-frequency unit arrays is provided with 9 high-frequency units 120, and the 9 high-frequency units 120 are arranged at equal intervals. It is understandable that the specific number of low-frequency unit arrays and high-frequency unit arrays, the number of low-frequency units 110 in the low-frequency unit array and the number of high-frequency units 120 in the high-frequency unit array, the spacing between adjacent low-frequency units 110 and adjacent high-frequency units 120, and the spacing between the low-frequency unit array and the high-frequency unit array can be specifically set by those skilled in the art according to actual application conditions. The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Those skilled in the art can make various equivalent changes and improvements on the basis of the above embodiments, such as appropriately adjusting the number of low-frequency unit arrays and high-frequency unit arrays, the number of low-frequency units 110 in the low-frequency unit array and the number of high-frequency units 120 in the high-frequency unit array, the spacing between adjacent low-frequency units 110 and adjacent high-frequency units 120, and the spacing between the low-frequency unit array and the high-frequency unit array.

[0033] Among them, the mutual coupling suppression dual-frequency dual-polarization linear array antenna includes multiple ports 140 connected to the reflector 100, each port 140 is used for signal exchange. In a specific implementation of an embodiment of the present invention, the mutual coupling suppression dual-frequency dual-polarization linear array antenna includes 10 ports 140, realizes MIMO multi-channel coverage requirements, and supports multiple channel information exchange.

[0034] Among them, the operating frequency bands of the mutually coupled dual-frequency dual-polarized linear array antenna include 1710-2700MHz and 3300-3600MHz, which can cover both 4G and 5G operating frequency bands.

[0035] On the one hand, the embodiment of the present invention adopts a rhombus oscillator unit composed of four dipoles 111 arranged around the center to form a low-frequency unit 110. Compared with the cross oscillator, the rhombus oscillator unit has good beam convergence and higher gain. On the other hand, by adopting a high-frequency unit 120 made of a multi-layer dielectric substrate 121, a feeding network and an antenna patch, the cross-sectional height of the high-frequency unit 120 can be effectively reduced. Furthermore, symmetrical slits are opened on the radiation surface of the antenna patch to improve impedance and optimize isolation indicators. In this way, the embodiment of the present invention can reduce the mutual coupling and cross-frequency scattering of the high-frequency unit 120 and the low-frequency unit 110 when the aperture of antenna units in different frequency bands is shared.

[0036] Furthermore, the embodiment of the present invention is experimentally optimized to configure a dual-frequency dual-polarization linear array antenna with mutual coupling suppression, including three low-frequency unit arrays and two high-frequency unit arrays, and specifically limits the number of units in each array, while simultaneously taking into account the performance parameters of antennas in different frequency bands, and rationally arranging and arranging the arrays to achieve an integrated, high-performance antenna design. While maintaining the compactness of the array antenna structure, it reduces mutual coupling and scattering between units, and can significantly improve antenna performance parameter indicators.

[0037] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present invention should have the common meanings understood by technicians in the field to which the embodiments of the present invention belong.

[0038] In the description of the embodiments of the present invention, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention.

[0039] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0040] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0041] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A dual-frequency dual-polarization antenna with mutual coupling suppression, characterized in that: The mutual coupling suppression dual-frequency dual-polarization antenna comprises a reflector, and a low-frequency unit, a high-frequency unit and an isolator mounted on the reflector; the low-frequency unit and the high-frequency unit are separated by the isolator; The low-frequency unit includes four dipoles, each of the dipoles includes two dipole arms coupled to each other, and each of the dipole arms has a polygonal structure with a width increasing from the feeding end to the end; The dipole arms of the four dipoles are arranged to form a rhombus; The high-frequency unit includes a multi-layer dielectric substrate, a feeding network and an antenna patch. The feeding network and the antenna patch are respectively arranged on different dielectric substrates, and symmetrical slots are opened on the radiation surface of the antenna patch.

2. The mutual coupling suppression dual-frequency dual-polarization antenna according to claim 1, characterized in that: The four dipoles are centrally symmetrical and orthogonally combined to form a polarization distribution of positive and negative 45 degrees.

3. The mutual coupling suppression dual-frequency dual-polarization antenna according to claim 1, characterized in that: The vibrator arm is configured as a triangular cavity structure with a width increasing from the feeding end to the end.

4. The mutual coupling suppression dual-frequency dual-polarization antenna according to claim 1, characterized in that: The dipole arm extends from the feeding end to the center of the low-frequency unit; or, the dipole arm extends from the feeding end to the outside of the low-frequency unit.

5. The mutual coupling suppression dual-frequency dual-polarization antenna according to claim 1, characterized in that: The low-frequency unit comprises a feeding balun for supporting the four dipoles, one end of the feeding balun is connected to the feeding end of the dipole arm of each dipole, and the other end extends toward the reflecting plate and is fixedly connected to the reflecting plate.

6. The mutual coupling suppression dual-frequency dual-polarization antenna according to claim 1, characterized in that: The slots include a cross-shaped slot located in the middle of the radiation surface of the antenna patch, and four long strip slots evenly distributed at four corners of the cross-shaped slot.

7. The mutual coupling suppression dual-frequency dual-polarization antenna according to claim 1, characterized in that: The high frequency unit also includes four centrosymmetrical feeding probes, and the antenna patch is provided with four corresponding feeding points; One end of the four feeding probes is connected to the four feeding points respectively, and the other end is connected to the reflection plate.

8. A mutual coupling suppression dual-frequency dual-polarization linear array antenna, characterized in that: The mutual coupling suppression dual-frequency dual-polarization linear array antenna comprises a reflector, at least one isolator as described in any one of claims 1 to 7, a plurality of low-frequency units as described in any one of claims 1 to 7, and a plurality of high-frequency units as described in any one of claims 1 to 7; A plurality of the low-frequency units are arranged on the reflective plate to form at least one low-frequency unit array, and a plurality of the high-frequency units are arranged on the reflective plate to form at least one high-frequency unit array. Adjacent low-frequency unit arrays and high-frequency unit arrays are separated by an isolation member.

9. The mutual coupling suppression dual-frequency dual-polarization linear array antenna according to claim 8, characterized in that: The mutual coupling suppression dual-frequency dual-polarization linear array antenna includes three low-frequency unit arrays and two high-frequency unit arrays; each low-frequency unit array is provided with five low-frequency units, and each high-frequency unit array is provided with nine high-frequency units.

10. The mutual coupling suppression dual-frequency dual-polarization linear array antenna according to claim 9, characterized in that: The operating frequency bands of the mutually coupled dual-frequency dual-polarized linear array antenna include 1710-2700 MHz and 3300-3600 MHz.

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