Dual polarized differential base station antenna

Abstract

The application provides a dual-polarized differential base station antenna, and relates to the technical field of antennas.The base station antenna comprises a dielectric substrate, a ground plate, a plurality of slot units, and a plurality of feeders.The dielectric substrate is arranged on the ground plate, the plurality of slot units are arranged on the ground plate, each feeder is arranged on the dielectric substrate, each feeder is coupled to each slot unit, and the feeder is used for signal input.The dual-polarized differential base station antenna provided by the application solves the problem that the base station antenna in the prior art is difficult to simultaneously realize a wide frequency band, a low profile and dual polarization.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and in particular to a dual-polarized differential base station antenna. Background Technology

[0002] Base station antennas are a key component of wireless communication networks, primarily used to enable the transmission and reception of radio waves between base stations and mobile devices.

[0003] In related technologies, the main structural forms of base station antennas are microstrip patch antennas and cross magnetoelectric dipole antenna structures. The microstrip patch antenna structure mainly achieves dual-polarization radiation based on the mode orthogonality characteristics of the patch resonator, and can extend the bandwidth and improve the gain through common aperture stacking. As for the cross magnetoelectric dipole antenna structure, the impedance bandwidth is improved by the broadband matching characteristics of the magnetoelectric dipole antenna, thus achieving a wideband design.

[0004] However, the antennas of the aforementioned base stations often have a large profile height, which is not conducive to miniaturization design. Summary of the Invention

[0005] This application provides a dual-polarized differential base station antenna to solve the problem in related technologies that base station antennas cannot simultaneously achieve wide bandwidth, low profile, and dual polarization.

[0006] This application provides a dual-polarized differential base station antenna, comprising:

[0007] Dielectric substrate;

[0008] A ground plane, wherein the dielectric substrate is disposed on the ground plane, and the ground plane is provided with a plurality of slot units;

[0009] Multiple power supply components are disposed on the dielectric substrate, and each power supply component is coupled to each of the slot units respectively. The power supply components are used to receive signals.

[0010] In one possible implementation, the power supply element and the slot unit corresponding to the power supply element form a polarization radiation unit, and at least four polarization radiation units are provided, with the at least four polarization radiation units facing each other in pairs, and the two opposing polarization radiation units forming a polarization channel.

[0011] In one possible implementation, at least four of the slot units are distributed in a rotationally symmetrical manner around the center of the grounding plate.

[0012] In one possible implementation, at least four of the power supply components are distributed in a rotationally symmetrical manner around the center of the ground plane.

[0013] In one possible implementation, the slot unit includes a fan-shaped slot, a long straight slot, and an arc-shaped slot, the fan-shaped slot, the long straight slot, and the arc-shaped slot being connected in sequence, the fan-shaped slot being located on the side of the arc-shaped slot facing the center of the ground plane, and the power supply component being coupled to the long straight slot.

[0014] In one possible implementation, the apex of the fan-shaped slit is connected to the long straight slit, and the middle part of the arc-shaped slit is connected to the long straight slit.

[0015] The fan-shaped slit, the long straight slit, and the arc-shaped slit are all symmetrical about the central axis of the long straight slit.

[0016] In one possible implementation, the middle of the arc-shaped gap protrudes toward the end away from the long straight gap, and the center of the extended trajectory of the arc-shaped gap coincides with the center of the grounding plate.

[0017] In one possible implementation, the power supply element is a microstrip line, and the projection of the microstrip line onto the ground plane is located at one end of the long straight slot facing the arc-shaped slot.

[0018] In one possible implementation, the projection of the microstrip line onto the ground plane extends in a direction perpendicular to the extension direction of the long straight slit, and the projection of the microstrip line onto the ground plane is symmetrical about the central axis of the long straight slit.

[0019] In one possible implementation, the dielectric substrate is rectangular, and the corners of the dielectric substrate are chamfered, and the shape of the ground plane is consistent with the shape of the dielectric substrate.

[0020] This application provides a dual-polarized differential base station antenna, comprising: a dielectric substrate; a ground plane, wherein the dielectric substrate is disposed on the ground plane and multiple slot elements are formed on the ground plane; and multiple feed elements, which are disposed on the dielectric substrate and each feed element is coupled to a corresponding slot element, and the feed elements are used to receive signals. Thus, in use, a signal can be input through the feed elements and then coupled to the slot elements on the ground plane, where the slot elements act as radiation sources to radiate the signal outward. Based on the wideband characteristics of the slot elements, and combined with impedance matching optimization of the coupling between the feed elements and the slot elements, this base station antenna possesses wideband performance; by using multiple feed elements and multiple slot elements, dual-polarization performance can be easily achieved; and the overall structure of the base station antenna is simple, resulting in a low profile. This solves the problem in related technologies where base station antennas cannot simultaneously achieve wideband, low profile, and dual polarization. Attached Figure Description

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

[0022] Figure 1 A schematic diagram of the structure of a dual-polarized differential base station antenna from a first-view perspective, provided in an embodiment of this application;

[0023] Figure 2 A schematic diagram of the second view of a dual-polarized differential base station antenna provided in an embodiment of this application;

[0024] Figure 3 An S-parameter diagram of a dual-polarized differential base station antenna as a function of frequency is provided for an embodiment of this application;

[0025] Figure 4 A gain diagram of a dual-polarized differential base station antenna as a function of frequency is provided for an embodiment of this application;

[0026] Figure 5 This application provides a radiation pattern at the center frequency of the passband of the first polarization channel of a dual-polarized differential base station antenna.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100 - Dielectric substrate;

[0029] 200-Grounding;

[0030] 300 - Slot element; 300a - First slot element; 300b - Second slot element; 300c - Third slot element; 300d - Fourth slot element;

[0031] 310 - Fan-shaped gap;

[0032] 320 - Long straight slit;

[0033] 330 - Curved gap;

[0034] 400 - Power supply component; 400a - First microstrip line; 400b - Second microstrip line; 400c - Third microstrip line; 400d - Fourth microstrip line;

[0035] 410 - Power supply port.

[0036] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0037] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0038] In related technologies, base station antennas are a key component of wireless communication networks, mainly used to enable the transmission and reception of radio waves between base stations and mobile devices.

[0039] The main structural forms of base station antennas are microstrip patch antennas and cross magnetoelectric dipole antennas. The microstrip patch antenna structure mainly achieves dual-polarization radiation based on the mode orthogonality characteristics of the patch resonator, and can extend the bandwidth and improve the gain through common aperture stacking. For the cross magnetoelectric dipole antenna structure, the impedance bandwidth is improved by the broadband matching characteristics of the magnetoelectric dipole antenna, thus achieving a wideband design.

[0040] However, to meet the wideband design requirements, the aforementioned base station antennas often have to sacrifice profile height, resulting in a larger profile height, which is not conducive to miniaturization design. In other words, it is difficult to simultaneously satisfy wideband, low profile, and dual-polarization performance.

[0041] Based on this, this application provides a dual-polarized differential base station antenna, including: a dielectric substrate; a ground plane, wherein the dielectric substrate is disposed on the ground plane and multiple slot elements are formed on the ground plane; and multiple feed elements, which are disposed on the dielectric substrate and respectively coupled to each slot element, and the feed elements are used to receive signals. Thus, in use, a signal can be input through the feed elements and then coupled to the slot elements on the ground plane, whereby the slot elements act as radiation sources to radiate the signal outward. Specifically, based on the wideband characteristics of the slot elements and combined with impedance matching optimization of the coupling between the feed elements and the slot elements, this base station antenna possesses wideband performance; by setting multiple feed elements and multiple slot elements, dual-polarization performance can be easily achieved; and the overall structure of the base station antenna is simple, resulting in a low profile height. This solves the problem in related technologies where base station antennas cannot simultaneously achieve wideband, low profile, and dual polarization.

[0042] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0043] like Figure 1 and Figure 2As shown in the embodiment of this application, a dual-polarized differential base station antenna includes:

[0044] Dielectric substrate 100;

[0045] Ground plane 200, dielectric substrate 100 is disposed on ground plane 200, and multiple slot units 300 are formed on ground plane 200;

[0046] Multiple power supply components 400 are disposed on the dielectric substrate 100, and each power supply component 400 is coupled to each slot unit 300 respectively. The power supply component 400 is used to receive signals.

[0047] The dielectric substrate 100 can be made of glass fiber reinforced polytetrafluoroethylene, ceramic-filled polytetrafluoroethylene, polyimide composite material, or ceramic material, etc.; the ground plane 200 can be made of tin-plated / nickel-plated brass plate, aluminum alloy plate, copper plate, or silver-plated copper plate, etc., without limitation.

[0048] Specifically, the dielectric substrate 100 can be mounted on the upper surface of the ground plane 200 by bonding, soldering, or other means, that is, the ground plane 200 is located on the lower surface of the dielectric substrate 100. Multiple power feeders 400 can be mounted on the upper surface of the dielectric substrate 100 by bonding, soldering, or other means. Multiple slot units 300 are formed on the ground plane 200, and each power feeder 400 is correspondingly coupled to each slot unit 300. The power feeders 400 are used for signal reception.

[0049] In use, a signal can be input through the feed element 400 and then coupled to the slot element 300 on the ground plane 200. The slot element 300 acts as a radiation source to radiate the signal outward. Based on the wideband characteristics of the slot element 300, and combined with impedance matching optimization of the coupling between the feed element 400 and the slot element 300, this base station antenna possesses wideband performance. By using multiple feed elements 400 and multiple slot elements 300, dual-polarization performance can be easily achieved. Furthermore, the overall structure of the base station antenna is simple, resulting in a low profile. This solves the problem in related technologies where base station antennas cannot simultaneously achieve wideband, low profile, and dual polarization.

[0050] In some embodiments, such as Figure 1 As shown, the power supply element 400 and the slot element 300 corresponding to the power supply element 400 form a polarization radiation element. At least four polarization radiation elements are provided, and the at least four polarization radiation elements are opposite each other in pairs. The two opposite polarization radiation elements form a polarization channel.

[0051] Specifically, the center of the ground plane 200 and the center of the dielectric substrate 100 are on the same vertical line, which allows at least four slot units 300 to be distributed in rotational symmetry around the center of the ground plane 200, and at least four power supply units 400 to be distributed in rotational symmetry around the center of the dielectric substrate 100, which is equivalent to them also being distributed in rotational symmetry around the center of the ground plane 200.

[0052] Furthermore, the distribution positions of each power supply element 400 correspond to the distribution positions of each slot unit 300, so that the power supply element 400 and the slot unit 300 corresponding to the power supply element 400 form a polarization radiation unit, thereby forming at least four polarization radiation units that are opposite each other in pairs. The two opposite polarization radiation units form a polarization channel, thereby forming at least two polarization channels.

[0053] Therefore, in implementation, one polarization channel can be used as the signal radiation channel of the dual-polarized differential base station antenna, and the other polarization channel can be used as the signal receiving channel of the dual-polarized differential base station antenna, so that the polarization channels are isolated from each other and have high isolation performance.

[0054] In this embodiment, as Figure 1 As shown, four slot elements 300 and four feed elements 400 are set to form four uniformly circumferentially distributed polarized radiation elements, and two mutually orthogonal polarization channels are formed, which facilitates the realization of dual polarization performance.

[0055] In implementation, one polarization channel can be used as the signal radiation channel of the dual-polarized differential base station antenna, and the other polarization channel can be used as the signal receiving channel of the dual-polarized differential base station antenna. This ensures that the polarizations of the two polarization channels are orthogonal and mutually isolated, giving the base station antenna high isolation and high cross-polarization discrimination.

[0056] Furthermore, both the slot unit 300 and the power supply unit 400 adopt a rotationally symmetrical layout, which makes the overall structure simple and easy to achieve dual polarization.

[0057] In some embodiments, such as Figure 1 As shown, the slot unit 300 includes a fan-shaped slot 310, a long straight slot 320 and an arc-shaped slot 330, which are connected in sequence. The fan-shaped slot 310 is located on the side of the arc-shaped slot 330 facing the center of the ground plane 200, and the power supply component 400 is coupled to the long straight slot 320.

[0058] It should be noted that the fan-shaped gap 310 is a gap with a fan shape, having a apex and an arc-shaped part that are arranged opposite each other. In this embodiment, the arc angle of the fan-shaped gap 310 is 90 degrees; the long straight gap 320 is a strip-shaped gap that extends in a straight line; and the arc-shaped gap 330 is a gap that extends in an arc.

[0059] Thus, during operation, after the power supply component 400 receives an input signal, it can pass through the dielectric substrate 100 and couple with the long straight slit 320. Subsequently, the fan-shaped slit 310, the long straight slit 320, and the arc-shaped slit 330 work together to form a wideband electromagnetic resonance, ultimately achieving wideband, high gain, and low profile performance.

[0060] Specifically, the ground plane 200 and the dielectric substrate 100 can both be set as square structures with the same shape. The long straight gaps 320 in the four gap units 300 are evenly distributed around the center of the ground plane 200 (i.e., rotationally symmetrical distribution), and the long straight gaps 320 are located on the diagonal of the ground plane 200.

[0061] Secondly, such as Figure 1 As shown, the top corner of the fan-shaped gap 310 is connected to the long straight gap 320, and the middle part of the arc-shaped gap 330 is connected to the long straight gap 320; furthermore, the fan-shaped gap 310 is located at the end of the long straight gap 320 facing the center of the grounding plate 200, and the arc-shaped gap 330 is located at the end of the long straight gap 320 from the center of the grounding plate 200.

[0062] Furthermore, the fan-shaped gap 310, the long straight gap 320, and the arc-shaped gap 330 are all symmetrical about the central axis of the long straight gap 320, which is equivalent to being symmetrical about the diagonal of the grounding plate 200.

[0063] Thus, each slot unit 300 can be formed as a fan-shaped gradient slot with a symmetrical arc-shaped stalk at the tail, and the two polarized radiation units (including two oppositely arranged slot units 300) are located on the two diagonals of the base station antenna.

[0064] This allows the base station antenna to not only possess wide bandwidth, low profile, and high isolation, but also to achieve a high degree of matching between the overall structural symmetry and the symmetry of electromagnetic polarization, radiation, and feeding, while significantly improving dual-polarization isolation.

[0065] At the same time, the middle part of the arc-shaped gap 330 protrudes away from the end of the long straight gap 320, and the center of the extension trajectory of the arc-shaped gap 330 coincides with the center of the grounding plate 200. That is to say, each arc-shaped gap 330 is located on the same circle with the center of the grounding plate 200 as the center.

[0066] This allows the extension trajectories of each arc-shaped gap 330 to be conformal, thereby facilitating the adjustment of impedance matching, bandwidth, and symmetry.

[0067] In other embodiments, the arc angle of the fan-shaped slit 310 in the slit unit 300 can also be set to other angles, without limitation. It can also be set to include slits of other shapes, such as strips, circles, semicircles, etc.

[0068] In some embodiments, such as Figure 1 As shown, the power supply component 400 is a microstrip line, and the projection of the microstrip line on the ground plane 200 is located at one end of the long straight gap 320 facing the arc-shaped gap 330.

[0069] It should be noted that a microstrip line can be an open-ended microstrip feeder, meaning that one end of the microstrip line can be used for input signals (e.g., it can be connected to a feed / radiation circuit), while the other end has no electrical connection.

[0070] The microstrip lines can be fixed to the upper surface of the dielectric substrate 100 by bonding, welding or other methods. Four microstrip lines are arranged symmetrically around the center of the dielectric substrate 100, and each microstrip line is coupled to one of the four slot cells 300. In practice, the ends of each microstrip line on the same side can be set as feed ports 410.

[0071] The projection of the microstrip line onto the ground plane 200 is located at one end of the long straight slot 320 facing the curved slot 330, meaning that the signal in the microstrip line can preferentially couple to the long straight slot 320.

[0072] During operation, after a signal is input to the microstrip line, the signal can be transmitted through the dielectric substrate 100 via electromagnetic coupling and preferentially transferred to the long straight slot 320 in the lower ground plane 200. Subsequently, the fan-shaped slot 310, the long straight slot 320, and the arc-shaped slot 330 work together to form a wideband electromagnetic resonance, ultimately achieving wideband radiation performance.

[0073] Furthermore, such as Figure 1 As shown, the projection of the microstrip line onto the ground plane 200 extends in a direction perpendicular to the extension direction of the long straight slit 320, and the projection of the microstrip line onto the ground plane 200 is symmetrical about the central axis of the long straight slit 320.

[0074] Therefore, precise electromagnetic matching optimization of the coupled feed and symmetrical slot element 300 can be achieved, which can make the electromagnetic field of the microstrip line highly compatible with the radiation characteristics of the long straight slot 320. This enhances performance from four dimensions: coupling efficiency, polarization consistency, impedance matching, and radiation stability, further expanding the advantages of dual polarization, high isolation, and wide bandwidth of the base station antenna.

[0075] In other embodiments, the microstrip line may also correspond to other parts of the slot unit 300, such as the fan-shaped slot 310 or the arc-shaped slot 330. The feed element 400 may also be a microstrip line of other shapes, or it may be configured as a feed probe according to actual needs.

[0076] In some embodiments, such as Figure 1As shown, the dielectric substrate 100 is rectangular, and the corners of the dielectric substrate 100 are chamfered. The shape of the ground plane 200 is consistent with the shape of the dielectric substrate 100.

[0077] In this embodiment, both the dielectric substrate 100 and the ground plane 200 are square, and the four corners are chamfered, so that the shapes of the dielectric substrate 100 and the ground plane 200 are consistent.

[0078] Therefore, by incorporating chamfers, discontinuities in the ground current transmission path can be reduced while simultaneously achieving miniaturization of the overall structure and facilitating installation. In other words, the base station antenna adopts a chamfered rectangular shape for easy installation and optimizes the current distribution on its surface.

[0079] In this regard, it should be noted that the antenna of this base station uses a planar structure and a planar feed network, which maintains the advantages of low profile and simple structure, making it very easy to manufacture.

[0080] In this embodiment, for example, the four gap units 300 can be respectively configured as a first gap unit 300a, a second gap unit 300b, a third gap unit 300c, and a fourth gap unit 300d, which are rotationally symmetrically distributed around the center of the floor 200.

[0081] The four microstrip lines can be respectively configured as a first microstrip line 400a, a second microstrip line 400b, a third microstrip line 400c, and a fourth microstrip line 400d, which are rotationally symmetrically distributed around the center of the dielectric substrate 100.

[0082] Furthermore, the first microstrip line 400a, the second microstrip line 400b, the third microstrip line 400c, and the fourth microstrip line 400d are respectively coupled to the first slot unit 300a, the second slot unit 300b, the third slot unit 300c, and the fourth slot unit 300d.

[0083] At this time, signals can be transmitted to the first slot units 300a, second slot units 300b, third slot units 300c, and fourth slot units 300d of the ground plane 200 through the coupling structure of the first microstrip line 400a, second microstrip line 400b, third microstrip line 400c, and fourth microstrip line 400d on the surface of the dielectric substrate 100. Subsequently, energy is radiated outward on the metal surface of the ground plane 200 through the first slot units 300a, second slot units 300b, third slot units 300c, and fourth slot units 300d as radiation sources.

[0084] Secondly, the ends of each microstrip line on the same side can be configured as feed ports 410. For example, the left end of each microstrip line can be configured as a feed port 410.

[0085] Specifically, such as Figure 1 As shown, the feed port 410 on the first microstrip line 400a is 1. + The feed port 410 on the third microstrip line 400c is 1. - The feed port 410 on the second microstrip line 400b is 2 + The feed port 410 on the fourth microstrip line 400d is 2 - .

[0086] Based on this, when differential signals with the same amplitude but a phase difference of 180° are respectively generated by 1 + 1 - When the power is fed into the feed port 410, the first microstrip line 400a and the third microstrip line 400c couple the differential signal to the first slot unit 300a and the third slot unit 300c respectively for electromagnetic radiation / reception. At this time, the base station antenna operates in one of the polarization channels, which can be designated as the first polarization channel.

[0087] When differential signals with the same amplitude but a phase difference of 180° are generated by 2 + 2 - When the power supply port 410 is fed in, the second microstrip line 400b and the fourth microstrip line 400d couple the differential signal to the second slot element 300b and the fourth slot element 300d for electromagnetic reception / radiation. At this time, the base station antenna operates in another polarization channel, which can be called the second polarization channel.

[0088] like Figure 3 and Figure 4 As shown, Figure 3 These are the S-parameters of the base station antenna as a function of frequency. Figure 4 This represents the gain of the base station antenna as a function of frequency. It can be observed that the center frequency of this base station antenna is 4.25 GHz, the -10 dB bandwidth is 3.26–5.40 GHz (50.3%), and the isolation within the operating frequency band is less than -50 dB. The maximum gain within the operating frequency band is 7.65 dBi.

[0089] like Figure 5 As shown, Figure 5 The figure shows the radiation pattern of the first polarization channel of the base station antenna at the center frequency of the passband. As can be seen from the figure, the cross polarization in the operating frequency band is less than -50dB. The radiation pattern of the second polarization channel is completely consistent with that of the first polarization channel, and will not be described again.

[0090] In summary, the dual-polarized differential base station antenna provided in this application allows signals to be input through the feed element 400 and then coupled to the slot element 300 on the ground plane 200. The slot element 300 acts as a radiation source to radiate the signal outward. Based on the wideband characteristics of the slot element 300, and combined with impedance matching optimization of the coupling between the feed element 400 and the slot element 300, the base station antenna achieves wideband performance (e.g., wideband dual polarization in the 3.26-5.40 GHz frequency band). By setting multiple feed elements 400 and multiple slot elements 300, dual polarization performance can be easily achieved. Furthermore, the overall structure of the base station antenna is simple, resulting in a low profile. This solves the problem in related technologies where base station antennas cannot simultaneously achieve wideband, low profile, and dual polarization.

[0091] Furthermore, by employing differential feeding technology, high isolation and high cross-polarization discrimination are achieved. In other words, this base station antenna not only maintains a simple antenna structure (i.e., low profile) but also achieves high gain, high isolation, and high cross-polarization discrimination within its operating frequency band, making it highly competitive in base station communication antenna systems. Simultaneously, this base station antenna also boasts advantages such as simple fabrication and low cost. In summary, this base station antenna offers advantages such as wide bandwidth, high gain, high isolation, simple structure, and low profile, making it highly advantageous in base station communication antenna systems.

[0092] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A dual-polarized differential base station antenna, characterized in that, include: Dielectric substrate (100); Ground plane (200), the dielectric substrate (100) is disposed on the ground plane (200), and a plurality of slot units (300) are formed on the ground plane (200). Multiple power supply components (400) are disposed on the dielectric substrate (100), and each power supply component (400) is correspondingly coupled to each of the slot units (300). The power supply component (400) is used to receive signals. The slot unit (300) includes a fan-shaped slot (310), a long straight slot (320), and an arc-shaped slot (330). The fan-shaped slot (310), the long straight slot (320), and the arc-shaped slot (330) are connected in sequence. The fan-shaped slot (310) is located on the side of the arc-shaped slot (330) facing the center of the grounding plate (200). The power supply component (400) is coupled to the long straight slot (320). The top corner of the fan-shaped slit (310) is connected to the long straight slit (320), and the middle part of the arc-shaped slit (330) is connected to the long straight slit (320). The fan-shaped slit (310), the long straight slit (320), and the arc-shaped slit (330) are all symmetrical about the central axis of the long straight slit (320); The middle part of the arc-shaped slit (330) protrudes away from the end of the long straight slit (320), and the center of the extension trajectory of the arc-shaped slit (330) coincides with the center of the grounding plate (200).

2. The dual-polarized differential base station antenna according to claim 1, characterized in that, The power supply element (400) and the slot unit (300) corresponding to the power supply element (400) form a polarization radiation unit. At least four polarization radiation units are provided, and the at least four polarization radiation units are opposite each other in pairs. The two opposite polarization radiation units form a polarization channel.

3. The dual-polarized differential base station antenna according to claim 2, characterized in that, At least four of the slot units (300) are distributed in a rotationally symmetrical manner around the center of the grounding plate (200).

4. The dual-polarized differential base station antenna according to claim 3, characterized in that, At least four of the power supply elements (400) are distributed in a rotationally symmetrical manner around the center of the ground plane (200).

5. The dual-polarized differential base station antenna according to claim 1, characterized in that, The power supply component (400) is a microstrip line, and the projection of the microstrip line on the ground plane (200) is located at one end of the long straight slit (320) facing the arc-shaped slit (330).

6. The dual-polarized differential base station antenna according to claim 5, characterized in that, The projection of the microstrip line onto the ground plane (200) extends in a direction perpendicular to the extension direction of the long straight slit (320), and the projection of the microstrip line onto the ground plane (200) is symmetrical about the central axis of the long straight slit (320).

7. The dual-polarized differential base station antenna according to any one of claims 1-6, characterized in that, The dielectric substrate (100) is rectangular, and the corners of the dielectric substrate (100) are chamfered. The shape of the ground plane (200) is consistent with the shape of the dielectric substrate (100).

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