A broadband low-coupling dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feed

Abstract

The application discloses a kind of wideband low coupling dual-polarized dielectric resonator antennas based on dual-mode resonance and differential feed, including dielectric resonator, two pairs of orthogonal coaxial probe, first Wilkinson power divider, second Wilkinson power divider, first feed port and second feed port;Two pairs of orthogonal coaxial probe are inserted into dielectric resonator;Each pair of coaxial probe is connected with the two output ends of its corresponding Wilkinson power divider;First feed port excites a pair of coaxial probe to dielectric resonator feed by first Wilkinson power divider, and excites the horizontal polarization radiation mode in x-axis direction;Second feed port excites another pair of coaxial probe to dielectric resonator feed by second Wilkinson power divider, and excites the horizontal polarization radiation mode in y-axis direction;The application realizes compact structure, wideband, low coupling dual-polarized radiation mode, and each polarization further increases bandwidth by exciting two frequency points close to resonance mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of antennas in communication technology, in particular to a wideband low-coupling dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding. BACKGROUND

[0002] As a carrier of information transmission and reception, the antenna characteristics have an important influence on the performance of the communication system. With the further development of the next generation mobile communication system such as 5G and 6G, the industry has put forward higher requirements for the antenna unit suitable for large-scale MIMO (Multiple-Input Multiple-Output) technology group array, including the miniaturization, compactness, low coupling, easy production and other characteristics of the antenna unit. The dual-polarized antenna has been widely used in the related industry due to its advantages of improving channel capacity and reducing polarization mismatch; the dielectric resonator antenna has also attracted the attention of researchers due to its small size, high radiation efficiency, light weight and other characteristics. However, the existing dual-polarized dielectric resonator antenna is difficult to simultaneously realize the characteristics of wideband, low coupling and simple structure. In order to further improve the performance of the MIMO communication system, it is of important engineering significance to realize and optimize the above characteristics of the antenna.

[0003] According to the Shannon formula, the bandwidth is proportional to the channel capacity, and a large bandwidth of the antenna in operation is one of the basic conditions to realize a large bandwidth of the communication system, therefore, applying a wideband antenna to the MIMO system will effectively improve the channel capacity. In actual channel propagation, the polarization direction of the electromagnetic wave is changed after multiple reflections, diffractions and scattering, and the polarization mismatch phenomenon is easy to occur when reaching the receiving antenna. The dual-polarized antenna can reduce the polarization mismatch and significantly improve the channel capacity by using polarization diversity. The dual-polarized antenna has two ports, and realizes two polarization radiation modes in the same radiator, which requires the dual-polarized antenna to have a lower inter-port coupling in the operating frequency band, so as to fully realize polarization diversity and multiplexing.

[0004] Document [1] proposes a dual-band dual-polarized cross-shaped dielectric resonator antenna, which effectively eliminates some irrelevant high-order modes through a special structure, thereby improving the isolation between the ports. Calculated at the center frequency of the first frequency band, the electric size of the dielectric block of the antenna is 0.14x0.14x0.11λ0 3 , but the relative bandwidth of the two frequency bands is only 4.3% and 1.2%.

[0005] Document [2] proposes a dual-polarized four-leaf clover-shaped dielectric resonator antenna with differential feeding, which brings higher inter-port isolation to the antenna through a novel structure and a differential feeding method. By introducing a filter balun in the feeding network, the antenna has strong out-of-band suppression. The electric size of the antenna is 0.35x0.35x0.06λ0 3, the isolation is up to 65dB, but the relative bandwidth is only 9.2%.

[0006] Document [3] proposes a compact wideband low-profile single-and dual-polarized dielectric resonator antenna using dielectric and air vias, which adjusts the frequency of different modes of the antenna by filling cylindrical dielectric holes or air holes on the dielectric substrate to improve the bandwidth, and the common bandwidth is up to 34.88%, but its transverse area is larger than half a wavelength, which is difficult to further form a good array with good performance, and the structure is very complex.

[0007] Document [1] is H. Tang, J.-X. Chen, W.-W. Yang, L.-H. Zhou and W. Li. Differential dual-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 X. Differential dual-polarized filtering dielectric resonator antenna [J]. IEEE Transactions on Antennas and Propagation, 2018, 66(8): 4298-4302.

[0009] Document [3] is Kremer H I, Leung K W, Lee M W K. Compact wideband low-profile single-and dual-polarized dielectric resonator antennas using dielectric and air vias [J]. IEEE Transactions on Antennas and Propagation, 2021, 69(12): 8182-8193.

[0010] In summary, the existing dual-polarized dielectric resonator antenna has the following shortcomings and challenges in design and application:

[0011] (1) The contradiction between size and bandwidth. For dielectric resonator antennas, the larger the dielectric constant, the smaller the size that can be achieved, but the antenna resonant quality factor will also increase, resulting in smaller bandwidth for existing compact dual-polarized dielectric resonator antennas;

[0012] (2) The existing dual-polarized dielectric resonator antenna generally realizes orthogonal polarization through different modes, but the bandwidth of each mode is small, resulting in small overall dual-polarized bandwidth;

[0013] (3) The structure is complex, the existing dual-polarized dielectric resonator antenna usually utilizes a complex antenna structure and a complex feed network to realize wideband and low coupling characteristics, which is difficult to process and difficult to integrate with a circuit, is not conducive to mass production, and limits its application in large-scale arrays. SUMMARY

[0014] The present application provides a wideband low-coupling dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feed, which can realize large bandwidth, low coupling and simple structure at the same time, and can be used in the fields of wireless communication, large-scale MIMO antenna array, etc.

[0015] Technical scheme: A wideband low-coupling dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feed, comprising a dielectric substrate, a dielectric resonator, two pairs of orthogonal coaxial probes, a first Wilkinson power divider, a second Wilkinson power divider, a first feed port, a second feed port and a ground plate.

[0016] The ground plate is arranged on the upper surface of the dielectric substrate, the dielectric resonator is arranged on the ground plate, 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 pair of coaxial probes is connected to two output ends of the corresponding Wilkinson power divider through the ground plate.

[0017] The first feed port excites one pair of coaxial probes through the first Wilkinson power divider to feed the dielectric resonator, and excites a horizontal polarization radiation mode in the x-axis direction; the second feed port excites the other pair of coaxial probes through the second Wilkinson power divider to feed the dielectric resonator, and excites a horizontal polarization radiation mode in the y-axis direction, realizing dual-polarized radiation.

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

[0019] Further, the first feed port excites one pair of coaxial probes through the first Wilkinson power divider to feed the dielectric resonator, and excites a horizontal polarization radiation mode in the x-axis direction; the second feed port excites the other pair of coaxial probes through the second Wilkinson power divider to feed the dielectric resonator, and excites a horizontal polarization radiation mode in the y-axis direction, realizing dual-polarized radiation. y 111 , TE y 113 mode; the second feed port excites the other pair of coaxial probes through the second Wilkinson power divider to feed the dielectric resonator, and excites a TE x111 , TE x 113 mode.

[0020] Further, the first and second Wilkinson power dividers realize differential feeding.

[0021] Further, the first and second Wilkinson power dividers 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, the input end is connected with the first microstrip line, and then connected with two parallel quarter-wavelength microstrip lines, a limiting resistor is connected at the end of the two quarter-wavelength microstrip lines, and finally the second microstrip line is connected with the output end, and the length of the second microstrip line connected with the two output ends is different by half of the microstrip line waveguide wavelength, so that the output signal powers of the two output ends are the same, and there is a phase difference of 180 degrees.

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

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

[0025] Further, the limiting resistor is a limiting resistor with a resistance of 100 ohms.

[0026] Advantages: Compared with the prior art, the present application has the following advantages:

[0027] (1) The present application realizes a compact, broadband and low-coupling dual-polarized radiation mode through a single radiator, and obtains two orthogonal polarizations through TE x and TE y modes, respectively, and further increases the bandwidth by exciting TE 111 and TE 113 two frequency points close to the resonance mode. Specifically, the first feeding port differentially feeds the two probes via the first power divider, which is equivalent to introducing two current sources located on the x-axis, exciting the TE y 111 , TE y 113 mode of the dielectric resonator, and generating a broadband Ex polarization; similarly, the second feeding port differentially feeds the two probes via the second power divider, which is equivalent to introducing two current sources located on the y-axis, exciting the TE x 111 , TE x 113 mode, and generating a broadband Ey polarization;

[0028] (2) The application can make the resonator resonate in a wider frequency range by adjusting the size of the dielectric resonator and the radius, height and insertion position of the two symmetrical probes, thereby improving the bandwidth of the antenna;

[0029] (3) The application proposes to use a Wilkinson power divider as the feeding network of the dielectric resonator, and by changing the size of the transmission line of each section of the Wilkinson power divider, the impedance matching effect of the dielectric resonator and the feeding network is adjusted, and the bandwidth of the antenna is increased;

[0030] (4) The application adjusts the phase difference of the two output signals to be close to 180° at the working frequency band of the dielectric resonator by changing the length of the transmission line at the output end of the Wilkinson power divider, realizes differential feeding, and maintains a large bandwidth of the antenna;

[0031] (5) The application realizes low coupling characteristics of the two ports through differential feeding, which is equivalent to forming a virtual ground at the center position between the two feeding probes, making the field distribution under the two polarizations more orthogonal and less affected by each other, thereby reducing the coupling between the two ports;

[0032] (6) The dual-polarized dielectric resonator antenna proposed by the application meets the application requirements of miniaturization and compactness, and the relative bandwidth of the proposed dual-polarized antenna reaches 68%, and the size of the dielectric resonator is 0.378x0.378x0.441λ0 3 . BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structure diagram of a wideband low-coupling dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding proposed by the application; wherein, Figure 1 (a) in the figure is a whole structure diagram of the proposed antenna, Figure 1 (b) in the figure is a side view of the proposed antenna;

[0034] Figure 2 is a port S parameter diagram of a wideband low-coupling dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding proposed by the application;

[0035] Figure 3 is a dielectric resonator surface electric field distribution diagram when the first feeding port of a wideband low-coupling dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding proposed by the application works at different frequencies under separate excitation of the first feeding port; wherein, Figure 3 (a) in the figure is a dielectric resonator surface electric field distribution diagram when working at 2.0GHz, Figure 3 (b) in the figure is a dielectric resonator surface electric field distribution diagram when working at 2.8GHz, Figure 3(c) is a surface electric field distribution diagram of the dielectric resonator when working at 3.4 GHz in the figure, Figure 3 (d) is a surface electric field distribution diagram of the dielectric resonator when working at 4.2 GHz in the figure,

[0036] Figure 4 (c) is a surface electric field distribution diagram of the dielectric resonator when working at 3.4 GHz in the figure, Figure 4 (a) is a surface electric field distribution diagram of the dielectric resonator when working at 2.0 GHz in the figure, Figure 4 (b) is a surface electric field distribution diagram of the dielectric resonator when working at 2.8 GHz in the figure, Figure 4 (c) is a surface electric field distribution diagram of the dielectric resonator when working at 3.4 GHz in the figure, Figure 4 (d) is a surface electric field distribution diagram of the dielectric resonator when working at 4.2 GHz in the figure,

[0037] Figure 5 (c) is a surface electric field distribution diagram of the dielectric resonator when working at 3.4 GHz in the figure, Figure 5 (a) is an XOZ plane, Figure 5 (b) is a YOZ plane,

[0038] Figure 6 (c) is a surface electric field distribution diagram of the dielectric resonator when working at 3.4 GHz in the figure, Figure 6 (a) is an XOZ plane, Figure 6 (b) is a YOZ plane,

[0039] Figure 7 (c) is a surface electric field distribution diagram of the dielectric resonator when working at 3.4 GHz in the figure, Figure 7 (a) is an XOZ plane, Figure 7 (b) is a YOZ plane,

[0040] Figure 8 (c) is a surface electric field distribution diagram of the dielectric resonator when working at 3.4 GHz in the figure, Figure 8 (a) is an XOZ plane, Figure 8 (b) is a YOZ plane,

[0041] Figure 9 Figure 1 is an antenna electric field pattern of a wideband low-coupling dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding when the second feeding port is excited alone at 2.0 GHz according to the present application; wherein, Figure 9 (a) in Figure 1 is an XOZ plane, Figure 9 (b) in Figure 1 is a YOZ plane;

[0042] Figure 10 Figure 2 is an antenna electric field pattern of a wideband low-coupling dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding when the second feeding port is excited alone at 2.8 GHz according to the present application; wherein, Figure 10 (a) in Figure 2 is an XOZ plane, Figure 10 (b) in Figure 2 is a YOZ plane;

[0043] Figure 11 Figure 3 is an antenna electric field pattern of a wideband low-coupling dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding when the second feeding port is excited alone at 3.4 GHz according to the present application; wherein, Figure 11 (a) in Figure 3 is an XOZ plane, Figure 11 (b) in Figure 3 is a YOZ plane;

[0044] Figure 12 Figure 4 is an antenna electric field pattern of a wideband low-coupling dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding when the second feeding port is excited alone at 4.2 GHz according to the present application; wherein, Figure 12 (a) in Figure 4 is an XOZ plane, Figure 12 (b) in Figure 4 is a YOZ plane. DETAILED DESCRIPTION

[0045] The technical solutions of the present application will be further described in combination with the drawings and examples.

[0046] As shown in Figure 1, Figure 1 The present embodiment discloses a wideband low-coupling dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feeding, which mainly comprises 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 ground plate 11. The rectangular dielectric resonator 2 is arranged above the ground plate 11, two pairs of coaxial probes (the first coaxial probe 3 and the third coaxial probe 5 form a pair, and the second coaxial probe 4 and the fourth coaxial probe 6 form a pair) are inserted into the rectangular dielectric resonator, and the lower surface of the dielectric substrate 1 is a Wilkinson power divider. The coaxial probe is excited to feed the rectangular dielectric resonator 2 through the Wilkinson power divider by using an SMA coaxial interface with a characteristic impedance of 50 ohms.

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

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

[0049] The embodiment realizes dual-polarized radiation mode by feeding two pairs of orthogonal coaxial probes through two feeding ports. One of the feeding ports excites the horizontal polarization radiation mode in the x-axis direction, and the other feeding port excites the horizontal polarization radiation mode in the y-axis direction which is orthogonal to the x-axis direction. Specifically, the first coaxial probe 3 and the third coaxial probe 5 introduce two current sources for the rectangular dielectric resonator 2, and excite the TE y 111 and TE y 113 modes of the rectangular dielectric resonator 2. Similarly, the second coaxial probe 4 and the fourth coaxial probe 6 excite the TE x 111 and TE x 113 modes of the rectangular dielectric resonator 2. The TE 111 and TE 113 modes have similar directional diagrams and close resonance points, 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 mutually orthogonal dual-polarized radiation modes.

[0050] Figure 2The S parameter diagrams of each port of the proposed wideband low-coupling dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feed are shown. It can be seen from the diagrams that the impedance bandwidth of the proposed antenna is 2.14 GHz, the operating frequency band is 2.08-4.22 GHz, and the relative bandwidth is 68.0%. The isolation between the two ports is 17-59 dB in the operating frequency band, and the isolation is higher than 20 dB in most of the operating frequency band.

[0051] Figure 3 and Figure 4 The surface electric field distribution diagrams of the proposed wideband low-coupling dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feed when the first feed port is excited alone and the second feed port is excited alone at the operating frequencies of 2.0 GHz, 2.8 GHz, 3.4 GHz and 4.2 GHz are shown. According to the diagrams, the proposed antenna mainly exhibits the TE Figure 3 and Figure 4 It can be seen that the proposed antenna mainly exhibits the TE 111 mode at the frequencies of 2.0 GHz and 2.8 GHz, and the proposed antenna mainly exhibits the TE 113 mode at the frequencies of 3.4 GHz and 4.2 GHz. The electric field distribution diagrams of the excitation of different ports are mainly different in the direction of the electric field. It can be seen that the resonance of multiple modes has a significant effect on the improvement of the operating bandwidth of the antenna.

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

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

[0054] The relative bandwidth of the antenna is 68.0%, the isolation is higher than 20dB in most of the working frequency band, and the size of the dielectric block is 0.378*0.378*0.441λ0 3 , and the structure is simple, which has obvious advantages in the existing dual-polarized dielectric resonator antenna.

[0055] The embodiment realizes the compact structure, wide band and low coupling dual-polarized radiation mode through a single radiator, and obtains two orthogonal polarizations through TE x and TE y modes, and further increases the bandwidth by exciting the TE 111 and TE 113 modes with two frequency points close to each other. Specifically, the first feed port 9 differentially feeds two coaxial probes via the first Wilkinson power divider 7, which is equivalent to introducing two current sources located on the x-axis, exciting the TE y 111 , TE y 113 modes of the rectangular dielectric resonator 2, and generating a wideband Ex polarization; similarly, the second feed port 10 differentially feeds two coaxial probes via the second Wilkinson power divider 8, which is equivalent to introducing two current sources located on the y-axis, exciting the TE x 111 , TE x 113 modes, and generating a wideband Ey polarization. By adjusting the size of the rectangular dielectric resonator 2 and the radius, height and insertion position of the two symmetric coaxial probes, the rectangular dielectric resonator 2 can be resonated in a wider frequency range, thereby improving the bandwidth of the antenna.

[0056] The embodiment uses the Wilkinson power divider as the feed network of the dielectric resonator, adjusts the impedance matching effect of the dielectric resonator and the feed network by changing the size of each section of the transmission line of the Wilkinson power divider, increases the bandwidth of the antenna, and adjusts the phase difference of the two output signals to be close to 180° in the working frequency band of the dielectric resonator by changing the length of the transmission line at the output end of the Wilkinson power divider, realizes differential feeding, and maintains a larger bandwidth of the antenna. The invention realizes the low coupling characteristics of the two ports through differential feeding, which is equivalent to forming a virtual ground at the center position between the two feed probes, so that the field distribution of the two polarizations is more orthogonal and is not easily affected by each other, thereby reducing the coupling between the two ports.

[0057] The wideband low-coupling dual-polarized dielectric resonator antenna based on dual-mode resonance and differential feed proposed in the embodiment is compared with the existing partial dual-polarized dielectric resonator antennas, and the key parameters of each antenna are shown in Table 1, wherein λ0 represents the wavelength of an electromagnetic wave in free space at the center frequency of the working frequency range of the antenna. The parameters of the dual-polarized dielectric resonator antennas shown in Table 1 show that the existing antennas still have room for further improvement in terms of bandwidth, coupling and the like. Although some antennas have good characteristics such as bandwidth and coupling, the structure is relatively complex and difficult to be applied on a large scale. The antenna proposed in the embodiment has the advantages of small size, large bandwidth and simple structure, and has obvious advantages compared with the above antennas.

[0058] Table 1 Key parameters of each antenna

[0059]

Claims

1. A dual-mode resonant and differential-fed broadband low-coupling dual-polarized dielectric resonator antenna, characterized in that: The medium substrate, the medium resonator, two pairs of orthogonal coaxial probe pairs, the first Wilkinson power divider, the second Wilkinson power divider, the first feeding port, the second feeding port and the floor; The floor is arranged on the upper surface of the medium substrate, the medium 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 medium substrate, and the two pairs of coaxial probe pairs are inserted into the medium resonator; The bottom of each pair of coaxial probe pairs is connected to two output ends of the corresponding Wilkinson power divider through the floor; The first feeding port excites one pair of coaxial probe pairs to feed the medium resonator through the first Wilkinson power divider, and excites a horizontal polarization radiation mode in the x-axis direction; the second feeding port excites another pair of coaxial probe pairs to feed the medium resonator through the second Wilkinson power divider, and excites a horizontal polarization radiation mode in the y-axis direction, thereby realizing dual-polarized radiation. The first feed port excites a pair of coaxial probes to feed the dielectric resonator through a first Wilkinson power divider, exciting TE y 111 mode, TE y 113 mode, TE y 111 mode and TE y 113 mode are resonant modes with two frequency points close to each other; the second feed port excites another pair of coaxial probes to feed the dielectric resonator through a second Wilkinson power divider, exciting TE x 111 mode, TE x 113 mode, TE x 111 mode and TE x 113 mode are resonant modes with two frequency points close to each other.

2. A dual-mode resonant and differential feed based broadband low-coupling dual-polarized dielectric resonator antenna according to claim 1, characterized in that: The two pairs of orthogonal coaxial probe pairs are inserted into the medium resonator at the four edges and close to the edges, and each pair of coaxial probe pairs is in a symmetrical position.

3. A dual-mode resonant and differential feed based broadband low-coupling dual-polarized dielectric resonator antenna according to claim 1, characterized in that: The first Wilkinson power divider and the second Wilkinson power divider realize differential feeding.

4. The dual-mode resonant and differential feed based broadband low-coupling dual-polarized dielectric resonator antenna according to claim 1, 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, the input end is connected to the first microstrip line, then connected to two parallel quarter-wavelength microstrip lines, a limiting resistor is connected at the end of the two quarter-wavelength microstrip lines, and finally the second microstrip line is connected to the output end. The length of the second microstrip line connected to the two output ends differs by half the microstrip line waveguide wavelength, so that the output signal powers of the two output ends are the same, and there is a phase difference of 180 degrees.

5. A dual-mode resonant and differential feed based broadband low-coupling dual-polarized dielectric resonator antenna according to claim 4, characterized in that: The first microstrip line and the second microstrip line are both microstrip lines with a characteristic impedance of 50 ohms.

6. A dual-mode resonant and differential feed based broadband low-coupling dual-polarized dielectric resonator antenna according to claim 4, characterized in that: The quarter-wavelength microstrip line is a quarter-wavelength microstrip line with a characteristic impedance of 70.7 ohms.

7. A dual-mode resonant and differential feed based broadband low-coupling dual-polarized dielectric resonator antenna according to claim 4, characterized in that: The limiting resistor is a limiting resistor with a resistance of 100 ohms.

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