Broadband low-coupling dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feed

Abstract

The invention discloses a broadband low-coupling dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feed. The broadband low-coupling dual-polarization dielectric resonator antenna comprises a dielectric resonator, two pairs of orthogonal coaxial probe pairs, a first Wilkinson power divider, a second Wilkinson power divider, a first feed port and a second feed port, the two pairs of orthogonal coaxial probes are both inserted into the dielectric resonator; each pair of coaxial probes is connected with two output ends of the corresponding Wilkinson power divider; the first feed port excites the pair of coaxial probes to feed the dielectric resonator through the first Wilkinson power divider, and excites a horizontal polarization radiation mode in the x-axis direction; a second feed port excites the other pair of coaxial probes to feed towards the dielectric resonator through a second Wilkinson power divider, and a horizontal polarization radiation mode in the y-axis direction is excited; according to the invention, a dual-polarization radiation mode which is compact in structure, broadband and low in coupling is realized, and each polarization further increases the bandwidth by exciting two resonance modes with close frequency points.

Description

Technical Field

[0001] The invention relates to the field of antennas in communication technology, and in particular to a broadband low-coupling dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding. Background Art

[0002] As a carrier for sending and receiving information, antenna characteristics have an important impact on the performance of communication systems. With the further development of next-generation mobile communication systems such as 5G and 6G, the industry has put forward higher requirements for antenna units suitable for large-scale MIMO (Multiple-Input Multiple-Output) technology arrays, including miniaturization, compactness, low coupling, and easy production of antenna units. Dual-polarized antennas have been widely used in related industries due to their advantages in improving channel capacity and reducing polarization mismatch; dielectric resonator antennas as a new type of antenna have also attracted the attention of researchers due to their small size, high radiation efficiency, and light weight. However, it is difficult for existing dual-polarized dielectric resonator antennas to simultaneously achieve characteristics such as broadband, low coupling, and simple structure. In order to further improve the performance of MIMO communication systems, the realization and optimization of the above characteristics of antennas are of great engineering significance.

[0003] According to Shannon's formula, bandwidth is proportional to channel capacity. The large bandwidth of the antenna is one of the basic conditions for achieving a large bandwidth in the communication system. Therefore, applying broadband antennas to MIMO systems will effectively increase channel capacity. In actual channel propagation, electromagnetic waves often undergo multiple reflections, diffraction, and scattering, and the polarization direction changes, which can easily cause polarization mismatch when reaching the receiving antenna. Dual-polarized antennas can reduce polarization mismatch and significantly increase channel capacity by using polarization diversity. Dual-polarized antennas have two ports, which realize two polarized radiation modes in the same radiator. This requires that dual-polarized antennas have lower port-to-port coupling within the working frequency band to fully realize polarization diversity and multiplexing.

[0004] Reference [1] proposed a dual-band dual-polarization cross-shaped dielectric resonator antenna. Through a special structure, some irrelevant high-order modes are effectively eliminated, and the isolation between ports is improved. Calculated at the center frequency of the first frequency band, the electrical size of the antenna dielectric block is 0.14×0.14×0.11λ0 3 , but the relative bandwidths of the two frequency bands are only 4.3% and 1.2%.

[0005] Reference [2] proposed a differentially fed dual-polarized four-leaf clover-shaped dielectric resonator antenna. The novel structure and differential feeding method provide the antenna with higher port isolation. By introducing a filter balancer in the feeding network, the antenna has stronger out-of-band suppression. The electrical dimensions of the antenna are 0.35×0.35×0.06λ0 3, the isolation is 65dB, but the relative bandwidth is only 9.2%.

[0006] Reference [3] proposed a compact, broadband, low-profile, single-polarization and dual-polarization dielectric resonator antenna using dielectric and air holes. The frequency of different modes of the antenna is adjusted by filling cylindrical dielectric holes or air holes on the dielectric substrate to improve the bandwidth. Its common bandwidth reaches 34.88%, but its lateral area is large, larger than half a wavelength, making it difficult to further form an array with good performance, and the structure is very complex.

[0007] The literature [1] is H.Tang, J.-X.Chen, W.-W.Yang, L.-H.Zhou and W.Li. Differentialdual-band dual polarized dielectric resonator antenna[J]. IEEE Transactions on Antennas and Propagation, 2017, 65(2): 855-860.

[0008] Document [2] is Tang H, Tong C, Chen J

[0009] Document [3] is Kremer HI, Leung KW, Lee MW K. Compact wideband low-profilesingle-and dualpolarized dielectric resonator antennas using dielectric and air vias[J]. IEEE Transactions on Antennas and Propagation, 2021, 69(12):8182-8193.

[0010] In summary, the shortcomings of existing dual-polarized dielectric resonator antennas and the challenges they face in design and application are as follows:

[0011] (1) The contradiction between size and bandwidth. For dielectric resonator antennas, the larger the dielectric constant, the smaller the achievable size. However, the antenna resonance quality factor will also increase accordingly, resulting in a smaller bandwidth for existing dual-polarized dielectric resonator antennas with compact structures and small sizes.

[0012] (2) Existing dual-polarization dielectric resonator antennas generally achieve orthogonal polarization through different modes, but the bandwidth of each mode is small, resulting in a small overall dual-polarization bandwidth;

[0013] (3) Complex structure. Existing dual-polarized dielectric resonator antennas usually use complex antenna structures and complex feeding networks to achieve broadband and low coupling characteristics. They are difficult to process and difficult to integrate with circuits, which is not conducive to large-scale production and limits their application in large-scale arrays. Summary of the invention

[0014] Purpose of the invention: In order to solve the problems existing in the existing broadband dual-polarization dielectric resonator antenna, the present invention proposes a broadband low-coupling dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding, which can simultaneously achieve large bandwidth, low coupling and simple structure, and can be used in wireless communications, large-scale MIMO antenna arrays and other fields.

[0015] Technical solution: A broadband low-coupling dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding, comprising a dielectric substrate, a dielectric resonator, two pairs of orthogonal coaxial probe pairs, a first Wilkinson power divider, a second Wilkinson power divider, a first feeding port, a second feeding port and a floor;

[0016] The floor is arranged on the upper surface of the dielectric substrate, the dielectric resonator is arranged on the floor, the first Wilkinson power divider and the second Wilkinson power divider are arranged on the lower surface of the dielectric substrate, and the two pairs of coaxial probes are inserted into the dielectric resonator; the bottom of each pair of coaxial probes passes through the floor and is connected to the two output ends of the corresponding Wilkinson power divider;

[0017] The first feeding port excites a pair of coaxial probes to feed the dielectric resonator through a first Wilkinson power divider, thereby exciting a horizontally polarized radiation mode in the x-axis direction; the second feeding port excites another pair of coaxial probes to feed the dielectric resonator through a second Wilkinson power divider, thereby exciting a horizontally polarized radiation mode in the y-axis direction, thereby realizing dual-polarized radiation.

[0018] Furthermore, two pairs of orthogonal coaxial probes are respectively inserted into the four sides of the dielectric resonator and close to the edge, and each pair of coaxial probes is in a symmetrical position.

[0019] Furthermore, the first feeding port excites a pair of coaxial probes to feed the dielectric resonator through the first Wilkinson power divider, thereby exciting a TE y 111 TE y 113 mode; the second feeding port stimulates another pair of coaxial probes to feed the dielectric resonator through the second Wilkinson power divider, stimulating TE x111 TE x 113 model.

[0020] Furthermore, the first Wilkinson power divider and the second Wilkinson power divider implement differential feeding.

[0021] Further, the first Wilkinson power divider and the second Wilkinson power divider each include a first microstrip line, a quarter-wavelength microstrip line, a second microstrip line and a limiting resistor;

[0022] For any one of the first and second Wilkinson power dividers, its input end is connected to the first microstrip line, and then connected to two quarter-wavelength microstrip lines in parallel. A limiting resistor is connected to the ends of the two quarter-wavelength microstrip lines, and finally connected to the output end by the second microstrip line. The length of the second microstrip line connected to the two output ends differs by half of the wavelength of the microstrip line waveguide, so that the output signal power of the two output ends is the same and there is a phase difference of 180 degrees.

[0023] Furthermore, the first microstrip line and the second microstrip line are both microstrip lines with a characteristic impedance of 50 ohms.

[0024] Furthermore, the quarter-wavelength microstrip line is a quarter-wavelength microstrip line with a characteristic impedance of 70.7 ohms.

[0025] Furthermore, the limiting resistor is a 100 ohm limiting resistor.

[0026] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0027] (1) The present invention realizes a compact, broadband, low-coupling dual-polarization radiation mode through a single radiator, respectively through TE x and TE y mode to obtain two orthogonal polarizations, each polarization is further excited by TE 111 and TE 113 Specifically, the first feeding port feeds the two probes differentially via the first power divider, which is equivalent to introducing two current sources located on the x-axis to stimulate the TE of the dielectric resonator. y 111 TE y 113 mode, generating broadband Ex polarization; similarly, the second feeding port feeds the two probes differentially via the second power divider, which is equivalent to introducing two current sources located on the y-axis, stimulating TE x 111 TE x 113 mode, producing broadband Ey polarization;

[0028] (2) The present invention can adjust the size of the dielectric resonator and the radius, height and insertion position of the two symmetrical probes to enable the resonator to resonate within a wider frequency range, thereby improving the bandwidth of the antenna;

[0029] (3) The present invention proposes to use a Wilkinson power divider as a feeding network for a dielectric resonator, and to adjust the impedance matching effect between the dielectric resonator and the feeding network by changing the size of each transmission line section of the Wilkinson power divider, thereby increasing the bandwidth of the antenna;

[0030] (4) The present invention changes the transmission line length at the output end of the Wilkinson power divider to adjust the phase difference of the two output signals to be close to 180° in the working frequency band of the dielectric resonator, thereby realizing differential feeding and maintaining a large bandwidth of the antenna;

[0031] (5) The present invention realizes the low coupling characteristics of the two ports through differential feeding. The differential feeding is equivalent to forming a virtual ground at the center position between the two feeding probes, so that the field distribution under the two polarizations is more orthogonal and less likely to affect each other, thereby reducing the coupling between the two ports;

[0032] (6) The dual-polarized dielectric resonator antenna proposed in the present invention meets the application requirements of miniaturization and compactness. The relative bandwidth of the dual-polarized antenna proposed is 68%, and the size of the dielectric resonator is 0.378×0.378×0.441λ0 3 . BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic structural diagram of a broadband low-coupling dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding proposed by the present invention; wherein, Figure 1 (a) is the overall structure diagram of the proposed antenna. Figure 1 (b) is a side view of the proposed antenna;

[0034] Figure 2 The S parameter diagram of each port of a broadband low-coupled dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding proposed by the present invention;

[0035] Figure 3 The electric field distribution diagram of the dielectric resonator surface when the first feeding port of a broadband low-coupled dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding proposed by the present invention is separately excited and works at different frequencies; wherein, Figure 3 (a) is the surface electric field distribution diagram of the dielectric resonator when working at 2.0 GHz. Figure 3 (b) is the surface electric field distribution diagram of the dielectric resonator when working at 2.8 GHz. Figure 3(c) is the surface electric field distribution diagram of the dielectric resonator working at 3.4 GHz. Figure 3 (d) is the surface electric field distribution diagram of the dielectric resonator when working at 4.2 GHz;

[0036] Figure 4 The electric field distribution diagram of the dielectric resonator surface when the second feeding port of a broadband low-coupled dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding proposed by the present invention is separately excited and operates at different frequencies; wherein, Figure 4 (a) is the surface electric field distribution diagram of the dielectric resonator when working at 2.0 GHz. Figure 4 (b) is the surface electric field distribution diagram of the dielectric resonator when working at 2.8 GHz. Figure 4 (c) is the surface electric field distribution diagram of the dielectric resonator working at 3.4 GHz. Figure 4 (d) is the surface electric field distribution diagram of the dielectric resonator when working at 4.2 GHz;

[0037] Figure 5 The present invention provides a broadband low-coupled dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding, and the antenna electric field pattern when the first feeding port is excited alone at 2.0 GHz; wherein: Figure 5 (a) in the figure is the XOZ plane. Figure 5 (b) is the YOZ surface;

[0038] Figure 6 The present invention provides a broadband low-coupled dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding, and the antenna electric field pattern when the first feeding port is excited alone at 2.8 GHz; wherein: Figure 6 (a) in the figure is the XOZ plane. Figure 6 (b) is the YOZ surface;

[0039] Figure 7 The present invention provides a broadband low-coupled dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding, and the antenna electric field pattern when the first feeding port is excited alone at 3.4 GHz; wherein: Figure 7 (a) in the figure is the XOZ plane. Figure 7 (b) is the YOZ surface;

[0040] Figure 8 The present invention provides a broadband low-coupled dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding, and an antenna electric field pattern when the first feeding port is excited alone at 4.2 GHz; wherein: Figure 8 (a) in the figure is the XOZ plane. Figure 8 (b) is the YOZ surface;

[0041] Fig. 9 The present invention provides a broadband low-coupled dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding, and the antenna electric field pattern when the second feeding port is excited alone at 2.0 GHz; wherein: Fig. 9 (a) in the figure is the XOZ plane. Fig. 9 (b) is the YOZ surface;

[0042] Fig.10 The present invention provides a broadband low-coupled dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding, and the antenna electric field pattern when the second feeding port is excited alone at 2.8 GHz; wherein: Fig.10 (a) in the figure is the XOZ plane. Fig.10 (b) is the YOZ surface;

[0043] Fig.11 The present invention provides a broadband low-coupled dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding, and the antenna electric field pattern when the second feeding port is excited alone at 3.4 GHz; wherein: Fig.11 (a) in the figure is the XOZ plane. Fig.11 (b) is the YOZ surface;

[0044] Fig.12 The present invention provides a broadband low-coupled dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding, and the antenna electric field pattern when the second feeding port is excited alone at 4.2 GHz; wherein: Fig.12 (a) in the figure is the XOZ plane. Fig.12 (b) in the figure is the YOZ surface. DETAILED DESCRIPTION

[0045] The technical solution of the present invention is now further described in conjunction with the accompanying drawings and embodiments.

[0046] like Figure 1 As shown, this embodiment discloses a broadband low-coupling dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding, which mainly includes a dielectric substrate 1, a rectangular dielectric resonator 2, a first coaxial probe 3, a second coaxial probe 4, a third coaxial probe 5, a fourth coaxial probe 6, a first Wilkinson power divider 7, a second Wilkinson power divider 8, a first feeding port 9, a second feeding port 10 and a floor 11. The rectangular dielectric resonator 2 is arranged on the floor 11, and two pairs of coaxial probes (the first coaxial probe 3 and the third coaxial probe 5 are a pair, and the second coaxial probe 4 and the fourth coaxial probe 6 are a pair) are inserted into the rectangular dielectric resonator, and the lower surface of the dielectric substrate 1 is a Wilkinson power divider. An SMA coaxial interface with a characteristic impedance of 50 ohms is used to excite the coaxial probes to feed the rectangular dielectric resonator 2 through the Wilkinson power divider.

[0047] The four coaxial probes of this embodiment are respectively inserted near the edges of the four sides of the rectangular dielectric resonator 2, each pair of coaxial probes is in a symmetrical position, the coaxial probes are opened at the contact points with the floor 11, and the bottom of the coaxial probes is directly connected to the transmission line at the output end of the Wilkinson power divider. The first coaxial probe 3 and the third coaxial probe 5 are connected to the two output ends of the first Wilkinson power divider 7, and the second coaxial probe 4 and the fourth coaxial probe 6 are connected to the two output ends of the second Wilkinson power divider 8.

[0048] In this embodiment, the first Wilkinson power divider 7 and the second Wilkinson power divider 8 are both composed of multiple sections of microstrip lines and isolation resistors. For any one of the first Wilkinson power divider 7 and the second Wilkinson power divider 8, its input end is connected to a microstrip line with a characteristic impedance of 50 ohms, and then connected to two parallel sections of a quarter-wavelength microstrip transmission line with a characteristic impedance of 70.7 ohms. The ends of the two quarter-wavelength microstrip transmission lines are connected with a limiting resistor of 100 ohms, and finally the signal is output by the microstrip line with a characteristic impedance of 50 ohms. The output power of the signals at the two output ends is the same, and the length of the transmission line at the output end differs by half of the wavelength of the microstrip line waveguide, so that a phase difference of 180 degrees can be achieved between the output signals at both ends. The two output ends are respectively fed to symmetrical coaxial probes, that is, differential feeding is achieved.

[0049] In this embodiment, two pairs of orthogonal coaxial probes are fed through two feeding ports to realize dual-polarized radiation mode, wherein one feeding port excites a horizontal polarized radiation mode in the x-axis direction, and the other feeding port excites a horizontal polarized radiation mode in the y-axis direction orthogonal thereto. Specifically, the first coaxial probe 3 and the third coaxial probe 5 introduce two current sources into the rectangular dielectric resonator 2 to excite the TE y 111 TE y 113 Similarly, the second coaxial probe 4 and the fourth coaxial probe 6 excite the rectangular dielectric resonator TE 2 x 111 TE x 113 Mode.TE 111 and TE 113 The directivity patterns of the modes are similar, and the resonant frequencies are close, which increases the bandwidth of the antenna. The modes excited by the two pairs of coaxial probes are orthogonal to each other, realizing a pair of orthogonal dual-polarization radiation modes.

[0050] Figure 2The S-parameter diagrams of each port of the broadband low-coupled dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding are shown. It is easy to see from the figure that the proposed antenna has a -10dB impedance bandwidth of 2.14GHz, an operating frequency band of 2.08 to 4.22GHz, and a relative bandwidth of 68.0%. The isolation between the two ports is 17 to 59dB within the operating frequency band, and the isolation is higher than 20dB in most of the operating frequency band.

[0051] Figure 3 and Figure 4 The electric field distribution diagram of the dielectric resonator surface of the broadband low-coupled dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding proposed in this example is shown when the first feeding port is excited separately and the second feeding port is excited separately at the operating frequencies of 2.0 GHz, 2.8 GHz, 3.4 GHz and 4.2 GHz respectively. Figure 3 and Figure 4 It can be seen that at the two frequencies of 2.0 GHz and 2.8 GHz, the proposed antenna mainly exhibits TE 111 mode; at 3.4GHz and 4.2GHz, the proposed antenna mainly exhibits TE 113 The electric field distribution diagrams of the different ports are different only in the direction of the electric field. It can be seen that the multi-mode resonance has a significant effect on improving the antenna working bandwidth.

[0052] Figures 5 to 8 The radiation patterns of the proposed broadband low-coupled dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding when the first feeding port is excited separately at operating frequencies of 2.0 GHz, 2.8 GHz, 3.4 GHz, and 4.2 GHz. The XOZ plane is the antenna radiation H plane, and the YOZ plane is the antenna radiation E plane. It can be seen from the H-plane radiation pattern that the proposed antenna has a certain radiation effect in each frequency point, the cross-polarization ratio is good, and the basic shape of the radiation pattern is similar. The radiation direction of the radiation pattern is offset from the top direction, and the more it deviates from the center frequency, the more obvious the direction offset is. This is caused by the asymmetric structure of the Wilkinson power divider. The closer the E-plane radiation pattern is to the center frequency, the larger the cross-polarization ratio is, and the shapes of the radiation patterns are similar overall.

[0053] Figures 9 to 12 The radiation patterns of the proposed broadband low-coupled dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding when the second feeding port is excited separately at the operating frequencies of 2.0GHz, 2.8GHz, 3.4GHz, and 4.2GHz. The second feeding port is excited in a dual relationship with the first feeding port, the XOZ plane is the antenna radiation E plane, and the YOZ plane is the antenna radiation H plane. However, since the Wilkinson power dividers connected to the two ports are not exactly the same, the patterns under the two excitation methods are slightly different, but the overall radiation performance is close, and both have stable radiation characteristics within the operating frequency band.

[0054] The antenna proposed in this embodiment has a relative bandwidth of 68.0%. In most working frequency bands, the isolation is higher than 20 dB. The size of the dielectric block is 0.378×0.378×0.441λ0. 3 , simple structure, and has obvious advantages over the existing dual-polarization dielectric resonator antennas.

[0055] This embodiment realizes a compact, broadband, low-coupling dual-polarization radiation mode through a single radiator. x and TE y mode to obtain two orthogonal polarizations, each polarization is further excited by TE 111 and TE 113 Specifically, the first feeding port 9 feeds the two coaxial probes differentially via the first Wilkinson power divider 7, which is equivalent to introducing two current sources located on the x-axis to excite the TE of the rectangular dielectric resonator 2. y 111 TE y 113 mode, generating broadband Ex polarization; similarly, the second feeding port 10 feeds the two coaxial probes differentially via the second Wilkinson power divider 8, which is equivalent to introducing two current sources located on the y-axis to stimulate the TE x 111 TE x 113 By adjusting the size of the rectangular dielectric resonator 2 and the radius, height and insertion position of the two symmetrical coaxial probes, the rectangular dielectric resonator 2 can be made to resonate in a wider frequency range, thereby improving the bandwidth of the antenna.

[0056] This embodiment uses a Wilkinson power divider as the feeding network of the dielectric resonator, and adjusts the impedance matching effect of the dielectric resonator and the feeding network by changing the size of each section of the transmission line of the Wilkinson power divider, thereby increasing the bandwidth of the antenna. And by changing the length of the transmission line at the output end of the Wilkinson power divider, the phase difference of the two output signals is adjusted to be close to 180° in the working frequency band of the dielectric resonator, thereby realizing differential feeding and maintaining a large bandwidth of the antenna. The present invention realizes the low coupling characteristics of the two ports through differential feeding. Differential feeding is equivalent to forming a virtual ground at the center position between the two feeding probes, so that the field distribution under the two polarizations is more orthogonal and less likely to affect each other, thereby reducing the coupling between the two ports.

[0057] The broadband low-coupling dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding proposed in this embodiment is now compared with some existing dual-polarization dielectric resonator antennas. The key parameters of each antenna are shown in Table 1, where λ0 represents the wavelength of the electromagnetic wave in free space at the center frequency of the antenna's operating frequency band. The parameters of the dual-polarization dielectric resonator antennas shown in Table 1 indicate that there is still room for further improvement in bandwidth, coupling, and other aspects of existing antennas. Although some antennas have good characteristics such as bandwidth and coupling, their structures are relatively complex and difficult to apply on a large scale. Compared with the above antennas, the antenna proposed in this embodiment has a significant advantage in that it has a small size and a large bandwidth while maintaining a simple and easy-to-process structure.

[0058] Table 1 Key parameters of each antenna part

[0059]

Claims

1. A broadband low-coupled dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding, characterized in that: It includes a dielectric substrate, a dielectric resonator, two pairs of orthogonal coaxial probe pairs, a first Wilkinson power divider, a second Wilkinson power divider, a first feeding port, a second feeding port and a floor; The floor is arranged on the upper surface of the dielectric substrate, the dielectric resonator is arranged on the floor, the first Wilkinson power divider and the second Wilkinson power divider are both arranged on the lower surface of the dielectric substrate, and the two pairs of coaxial probes are both inserted into the dielectric resonator; The bottom of each coaxial probe pair passes through the floor and is connected to the two output ends of its corresponding Wilkinson power divider; The first feeding port excites a pair of coaxial probes to feed the dielectric resonator through a first Wilkinson power divider, thereby exciting a horizontally polarized radiation mode in the x-axis direction; the second feeding port excites another pair of coaxial probes to feed the dielectric resonator through a second Wilkinson power divider, thereby exciting a horizontally polarized radiation mode in the y-axis direction, thereby realizing dual-polarized radiation.

2. A broadband low-coupled dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding according to claim 1, characterized in that: Two pairs of orthogonal coaxial probes are respectively inserted into the four sides of the dielectric resonator and close to the edge, and each pair of coaxial probes is at a symmetrical position.

3. A broadband low-coupled dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding according to claim 1, characterized in that: The first feeding port excites a pair of coaxial probes to feed the dielectric resonator through the first Wilkinson power divider, exciting the TE y 111 Mode, TE y 113 Mode, TE y 111 Mode and TE y 113 The mode is a resonant mode with two frequencies close to each other; the second feeding port excites another pair of coaxial probes to feed the dielectric resonator through the second Wilkinson power divider, which excites the TE x 111 Mode, TE x 113 Mode, TE x 111 Mode and TE x 113 The mode is a resonant mode with two frequencies close to each other.

4. The broadband low-coupled dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding according to claim 1, characterized in that: The first Wilkinson power divider and the second Wilkinson power divider implement differential feeding.

5. A broadband low-coupled dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding according to claim 4, characterized in that: The first Wilkinson power divider and the second Wilkinson power divider each include a first microstrip line, a quarter-wavelength microstrip line, a second microstrip line and a limiting resistor; For any one of the first and second Wilkinson power dividers, its input end is connected to the first microstrip line, and then connected to two parallel quarter-wavelength microstrip lines. A limiting resistor is connected to the ends of the two quarter-wavelength microstrip lines, and finally connected to the output end by the second microstrip line. The length of the second microstrip line connected to the two output ends differs by half of the wavelength of the microstrip line waveguide, so that the output signal power of the two output ends is the same and there is a phase difference of 180 degrees.

6. A broadband low-coupled dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding according to claim 5, characterized in that: The first microstrip line and the second microstrip line are both microstrip lines with a characteristic impedance of 50 ohms.

7. The broadband low-coupled dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding according to claim 5, characterized in that: The quarter-wavelength microstrip line is a quarter-wavelength microstrip line with a characteristic impedance of 70.7 ohms.

8. The broadband low-coupling dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feeding according to claim 5, characterized in that: The limiting resistor is a 100 ohm limiting resistor.

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