Dual-polarized dipole antenna

Abstract

The invention relates to the technical field of wireless communication, and particularly provides a dual-polarized dipole antenna, which comprises a dielectric plate, a first radiation layer and a second radiation layer, the first radiation layer and the second radiation layer are respectively arranged on the upper surface and the lower surface of the dielectric plate and are connected with the coaxial cable; a plurality of main body feeder lines and a plurality of dipole arms are arranged in the second radiation layer; the plurality of main body feeder lines are rotationally and symmetrically arranged by taking the center of the dielectric plate as an axis, and an interval space is formed between every two adjacent main body feeder lines; the multiple dipole arms are rotationally and symmetrically arranged with the center of the dielectric plate as the axis, the multiple dipole arms and the multiple interval spaces are arranged in a one-to-one correspondence mode, and the dipole arms are located in the corresponding interval spaces. According to the antenna array, the electromagnetic transparent characteristic can be achieved, meanwhile, the overall electromagnetic transparent structure is simplified, the requirement that the coverage range of the frequency band meets the requirement is met, and it is guaranteed that the multi-frequency common-caliber base station antenna array is smoothly and effectively built.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless communications, and in particular relates to a dual-polarization dipole antenna. Background Art

[0002] In multi-frequency, co-aperture base station antenna arrays, the compact spacing between the various antennas makes it very easy for the larger, higher-profile low-frequency antennas to block the high-frequency antennas. When the high-frequency antennas are excited, the high-frequency induced currents flowing through the low-frequency antennas degrade the high-frequency antenna's radiation characteristics, leading to distortion of the high-frequency antenna's pattern and reduced gain.

[0003] Existing base station antenna arrays generally achieve the purpose of suppressing the high-frequency induced current distributed on the low-frequency antenna by adopting a stacked structure design or an electromagnetically transparent structure design, thereby reducing the degree of interference with the radiation characteristics of the high-frequency antenna. However, when implementing the above-mentioned stacked structure design, it is inevitable that the overall cross-sectional dimensions of the base station antenna array will increase, and the high-frequency antenna feed cable needs to pass through the low-frequency antenna to complete the connection and setup, which increases the overall complexity of the base station antenna array and makes it more difficult to manufacture. When implementing the above-mentioned electromagnetically transparent structure design, the design itself is relatively complex, resulting in greater difficulty in manufacturing, and the electromagnetically transparent bandwidth that can be achieved is relatively narrow, which is insufficient to meet the coverage requirements of the frequency band, making it difficult to realize a multi-frequency common-aperture base station antenna array. Summary of the Invention

[0004] To address the above problems, the present invention proposes a dual-polarized dipole antenna, comprising: dielectric board; a first radiation layer, which is disposed on the upper surface of the dielectric plate and connected to the coaxial cable; a second radiation layer, which is disposed on the lower surface of the dielectric plate and connected to the coaxial cable; The second radiation layer is provided with a main body feed line and a dipole arm; The main body feeder is provided with a plurality of main body feeders, and the plurality of main body feeders are arranged rotationally symmetrically with the center of the dielectric plate as the axis, and a spacing space is formed between each two adjacent main body feeders; There are multiple dipole arms, which are rotationally symmetrically arranged with the center of the dielectric plate as the axis. The multiple dipole arms are arranged in a one-to-one correspondence with the multiple spacing spaces, and the dipole arms are located in the corresponding spacing spaces.

[0005] In some specific embodiments, four main body feeders are provided, and the main body feeders are L-shaped structures; Four dipole arms are provided, and the four dipole arms are respectively located in the four interval spaces.

[0006] In some specific embodiments, a first feeder branch is provided on a side of the main feeder away from the dipole arm; There are two first feeder branch sections, both of which are L-shaped structures. The two first feeder branch sections are respectively located at two ends of the main feeder and are symmetrically arranged with the bending part of the main feeder as the axis.

[0007] In some specific embodiments, a second feeder branch is provided on a side of the main feeder away from the dipole arm; The second feeder branch is a T-shaped structure and is located at the bend of the main feeder.

[0008] In some specific embodiments, first sub-arm branches are respectively provided at both ends of the dipole arm; The two first sub-arm branches are both U-shaped structures and are symmetrically arranged with the center of the dipole arm as the axis.

[0009] In some specific embodiments, a second sub-arm branch is provided in the middle portion of the dipole arm; The second sub-arm branch is an H-shaped structure and is located between two first sub-arm branches.

[0010] In some specific embodiments, the first radiation layer is provided with a first microstrip feed line and a second microstrip feed line; A cutting groove is provided in the middle of the second microstrip feed line; The first microstrip feed line is arranged through the cutting groove.

[0011] In some specific embodiments, a microstrip connecting line is further provided in the second radiation layer; Both ends of the microstrip connecting line are passed through the dielectric plate and are respectively connected to the second microstrip feeding lines on both sides of the cutting groove.

[0012] In some specific embodiments, the first microstrip feed line and the second microstrip feed line are arranged perpendicular to each other.

[0013] In some specific embodiments, two coaxial cables are provided, and each coaxial cable is coaxially provided with an inner conductor and an outer conductor; The outer conductor of one of the coaxial cables is connected to one of the main feeders, and the inner conductor is sequentially passed through the main feeder and the dielectric plate and connected to the first microstrip feeder; The outer conductor of another coaxial cable is connected to the other main body feeder, and the inner conductor is sequentially passed through the main body feeder and the dielectric plate and connected to the second microstrip feeder.

[0014] Compared with the prior art, the dual-polarized dipole antenna of the present invention has at least the following advantages: through the mutual coordination between multiple main feed lines and multiple dipole arms in the second radiation layer, it can achieve electromagnetic transparency while simplifying the overall electromagnetic transparent structure, and enable it to cover the 3.3GHz to 4.2GHz and 4.8GHz to 5GHz frequency bands, so as to meet the frequency band coverage requirements and ensure the smooth and effective construction of the multi-frequency common-aperture base station antenna array.

[0015] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic diagram of a dual-polarized dipole antenna in an embodiment of the present invention is shown; Figure 2 A schematic diagram showing the upper surface of a dielectric plate in an embodiment of the present invention is shown; Figure 3 A schematic diagram showing the lower surface of a dielectric plate in an embodiment of the present invention is shown; Figure 4 A diagram showing simulation results of scattering parameters of a dual-polarized dipole antenna in an embodiment of the present invention is shown; Figure 5 A diagram showing simulation results of the gain of a dual-polarized dipole antenna in an embodiment of the present invention is shown; Figure 6 A diagram showing simulation results of the half-power beamwidth of the dual-polarized dipole antenna in an embodiment of the present invention; Figure 7 A diagram showing simulation results of the center frequency pattern of the dual-polarized dipole antenna in an embodiment of the present invention is shown; Figure 8 A simulation diagram showing the application of a dual-polarized dipole antenna in an embodiment of the present invention in a triple-band co-aperture base station antenna array is shown; Figure 9 for Figure 8 Directional pattern at 3.75 GHz when two high-frequency antenna units are excited; Figure 10 for Figure 8 The directional pattern of two high-frequency antenna units at 4.9 GHz when excited.

[0018] In the figure, 100 is a dielectric plate; 200 is a first radiation layer; 210 is a first microstrip feed line; 220 is a second microstrip feed line; 300 is a second radiation layer; 310 is a main feed line; 311 is a first feed line branch; 312 is a second feed line branch; 320 is a dipole arm; 321 is a first sub-arm branch; 322 is a second sub-arm branch; 330 is a microstrip connecting line; 400 is a coaxial cable; 500 is a short-circuit post. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0020] Reference Figure 1 An embodiment of the present invention provides a dual-polarized dipole antenna, characterized by comprising: a dielectric plate 100, a first radiating layer 200, and a second radiating layer 300. The first radiating layer 200 is disposed on the upper surface of the dielectric plate 100 and connected to the coaxial cable 400. The second radiating layer 300 is disposed on the lower surface of the dielectric plate 100 and connected to the coaxial cable 400. A main feed line 310 and a dipole arm 320 are disposed in the second radiating layer 300. Multiple main feed lines 310 are provided, and the multiple main feed lines 310 are rotationally symmetrically arranged about the center of the dielectric plate 100, with a spacing formed between each adjacent two main feed lines 310. Multiple dipole arms 320 are provided, and the multiple dipole arms 320 are rotationally symmetrically arranged about the center of the dielectric plate 100, and the multiple dipole arms 320 are arranged in a one-to-one correspondence with the multiple spacings, with the dipole arms 320 being located within the corresponding spacings.

[0021] Specifically, the dielectric plate 100 is horizontally disposed above the ground and spaced apart from the ground, allowing for the placement of multiple high-frequency antenna units 600 between the dielectric plate 100 and the ground. A first radiating layer 200 is disposed in the middle of the upper surface of the dielectric plate 100, while a second radiating layer 300 is disposed in the middle of the lower surface of the dielectric plate 100. The first and second radiating layers 200 and 300 are staggered to prevent vertical overlap. The second radiating layer 300 includes multiple main feed lines 310 and multiple dipole arms 320. Among them, multiple main body feeders 310 are arranged rotationally symmetrically with the center of the dielectric plate 100 as the axis, and each adjacent two main body feeders 310 are spaced apart, so that a spacing space is formed between each adjacent two main body feeders 310. At the same time, the multiple main body feeders 310 are also spaced apart from each other, so that the middle part of the lower surface of the dielectric plate 100 is exposed, so that the first radiation layer 200 is arranged in the middle part of the upper surface of the dielectric plate 100 to avoid overlapping of the first radiation layer 200 and the second radiation layer 300. The multiple dipole arms 320 are also rotationally symmetrically arranged about the center of the dielectric plate 100 and correspond one-to-one with the multiple spacing spaces. Specifically, one dipole arm 320 is positioned between two adjacent main feeder lines 310 forming the corresponding spacing space, ensuring that a dipole arm 320 is positioned between each pair of adjacent main feeder lines 310. Furthermore, the multiple dipole arms 320 are spaced apart to prevent the dipole arms 320 from extending beyond the middle portion of the lower surface of the dielectric plate 100, thereby ensuring that the middle portion of the lower surface of the dielectric plate 100 is exposed. The coordinated relationship between the multiple main feeder lines 310 and the multiple dipole arms 320 in the second radiating layer 300 simplifies the overall electromagnetically transparent structure while achieving electromagnetic transparency. This allows the structure to cover the 3.3 GHz to 4.2 GHz and 4.8 GHz to 5 GHz frequency bands, thereby meeting frequency band coverage requirements and ensuring the smooth and effective construction of a multi-frequency, common-aperture base station antenna array.

[0022] Furthermore, a shorting post 500 and a coaxial cable are provided. One end of the shorting post 500 is connected to the ground, while the other end is connected to the first radiating layer 200 and the second radiating layer 300 of the dielectric plate 100. The coaxial cable 400 is connected to the first radiating layer 200 and the second radiating layer 300, respectively.

[0023] The dielectric plate 100 has an area size of 70 mm×70 mm.

[0024] In some specific embodiments of the present invention, referring to Figure 3 There are four main feed lines 310, each of which is an L-shaped structure. There are four dipole arms 320, each of which is located in one of the four interval spaces.

[0025] Specifically, four main feed lines 310 are provided, and each main feed line 310 is bent in the middle to form an L-shaped structure. Two main feed lines 310 are symmetrically arranged in the same area of the dielectric plate 100, and the sides of the two main feed lines 310 are adjacent and spaced apart. Another two main feed lines 310 are symmetrically arranged in another area of the dielectric plate 100, and the sides of the two main feed lines 310 are adjacent and spaced apart. In addition, the two areas are symmetrically arranged, so that the two main feed lines 310 in one area and the two main feed lines 310 in the other area can also be symmetrically arranged, and the sides of the two main feed lines 310 in one area and the sides of the two main feed lines 310 in the other area are also adjacent and spaced apart, so that the four main feed lines 310 can form a cross-shaped structure as a whole on the lower surface of the dielectric plate 100. At the same time, the four interval spaces formed by the adjacent sides of the multiple main feed lines 310 can also form a cross-shaped structure as a whole. There are four dipole arms 320, which are respectively arranged in four interval spaces, so that the four dipole arms 320 can form a cross-shaped structure as a whole. This can ensure the simplification of the overall electromagnetic transparent structure to meet the requirements of the frequency band coverage and ensure the smooth and effective construction of the multi-frequency common aperture base station antenna array. Among them, the length of the two sides of the main feed line 310 is 17mm, the width of the middle bend of the main feed line 310 is 1.5mm, the length of the dipole arm 320 is 30mm, and the width of the middle of the dipole arm 320 is 0.5mm. It should be noted that the four dipole arms 320 are not in direct contact with the main feed line 310. Each dipole arm 320 is coupled with the adjacent main feed line 310, and energy transfer is achieved through coupling, so that the gap between the main feed line 310 and the dipole arm 320 can be equivalent to a capacitor to adjust the impedance matching of the antenna.

[0026] In some specific embodiments of the present invention, referring to Figure 3 A first feeder branch 311 is provided on the side of the main feeder 310 away from the dipole arm 320. Two first feeder branches 311 are provided, both of which are L-shaped structures. The two first feeder branches 311 are located at both ends of the main feeder 310 and are symmetrically arranged with the bend of the main feeder 310 as the axis.

[0027] Specifically, the two first feeder branches 311 are both arranged on the side of the main feeder 310 away from the dipole arm 320, and the two first feeder branches 311 are respectively located at both ends of the main feeder 310. Among them, one end of the first feeder branch 311 is perpendicular to the end of the corresponding main feeder 310 and connected to the end, while the other end of the first feeder branch 311 first extends in a direction away from the main feeder 310, and then bends to be parallel to the end of the corresponding main feeder 310 and extends in a direction close to the bend of the corresponding main feeder 310. By forming a two-section branch structure on the main feeder 310 through the two first feeder branches 311, it is possible to simplify the overall electromagnetic transparent structure while achieving electromagnetic transparency characteristics, and enable it to also cover the 3.3GHz to 4.2GHz and 4.8GHz to 5GHz frequency bands, so as to meet the frequency band coverage requirements and ensure the smooth and effective construction of the multi-frequency common aperture base station antenna array. The first feeder branch 311 can be equivalent to a low-pass filter, and the suppression range of high-frequency harmonics can be adjusted by adjusting the branch length of the first feeder branch 311 to achieve wide electromagnetic transparency characteristics.

[0028] In some specific embodiments of the present invention, referring to Figure 3 A second feeder branch 312 is provided on a side of the main feeder 310 away from the dipole arm 320. The second feeder branch 312 is a T-shaped structure and is located at a bend of the main feeder 310.

[0029] Specifically, the second feeder branch 312 is arranged on the side of the main feeder 310 away from the dipole arm 320, and is located at the bend of the main feeder 310. Among them, one end of the bottom of the second feeder branch 312 is connected to the bend of the corresponding main feeder 310, and the two ends of the top of the second feeder branch 312 are first parallel to the two ends of the corresponding main feeder 310 and extend in the direction close to the two first feeder branches 311, and then bend to be perpendicular to the two ends of the corresponding main feeder 310 and extend in the direction away from the main feeder 310. A three-section branch structure is formed on the main feeder 310 by the second feeder branch 312 and the two first feeder branches 311, which can simplify the overall electromagnetic transparent structure while achieving electromagnetic transparency, further meet the coverage requirements of the frequency band, and ensure the smooth and effective construction of the multi-frequency common aperture base station antenna array. The second feeder branch 312 and the first feeder branch 311 can be equivalent to a low-pass filter. By adjusting the branch lengths of the second feeder branch 312 and the first feeder branch 311, the suppression range of high-frequency harmonics can be adjusted to achieve wide electromagnetic transparency. The short side of the first feeder branch 311 directly connected to the main feeder 310 is 1.3 mm long, the long side of the first feeder branch 311 indirectly connected to the main feeder 310 is 7 mm long, and the width of the first feeder branch 311 is 0.8 mm. The length of the bent part of the second feeder branch 312 of the T-shaped structure is 3.5 mm, the length of the unbent part of the second feeder branch 312 of the T-shaped structure is 7 mm, the length of the connection between the second feeder branch 312 of the T-shaped structure and the main feeder 310 is 0.7 mm, and the width of the connection between the second feeder branch 312 of the T-shaped structure and the main feeder 310 is 0.8 mm.

[0030] It should be noted that the second feeder line branch 312 is not in direct contact with the corresponding two first feeder line branches 311 .

[0031] In some specific embodiments of the present invention, referring to Figure 3 The two ends of the dipole arm 320 are respectively provided with first sub-arm branches 321. The two first sub-arm branches 321 are both U-shaped structures and are symmetrically arranged with the center of the dipole arm 320 as the axis.

[0032] Specifically, two first sub-arm branches 321 are respectively provided at the ends of the dipole arm 320, with the ends of the dipole arm 320 perpendicularly connected to the middle of the corresponding first sub-arm branch 321. The ends of the corresponding first sub-arm branch 321 first extend perpendicularly to the dipole arm 320 in a direction away from the dipole arm 320, then bend and extend parallel to the dipole arm 320 and toward the middle of the dipole arm 320, thereby forming a U-shaped structure of the first sub-arm branch 321. The two ends of any first sub-arm branch 321 are symmetrical with respect to the axis of the corresponding dipole arm 320, and the two first sub-arm branches 321 at the two ends of each dipole arm 320 are also symmetrical with respect to the center of the corresponding dipole arm 320, so that the two ends of the corresponding first sub-arm branch 321 correspond one-to-one and face each other. By forming a two-section branch structure on the dipole arm 320 through two first sub-arm branches 321, the overall electromagnetic transparency structure can be simplified while achieving electromagnetic transparency. This allows it to cover the 3.3GHz to 4.2GHz and 4.8GHz to 5GHz frequency bands, meeting the frequency band coverage requirements and ensuring the smooth and effective construction of a multi-frequency co-aperture base station antenna array. The first sub-arm branch 321 can be equivalent to a low-pass filter. By adjusting the branch length of the first sub-arm branch 321, the suppression range of high-frequency harmonics can be adjusted to achieve wide electromagnetic transparency.

[0033] In some specific embodiments of the present invention, referring to Figure 3 A second sub-arm branch 322 is provided in the middle of the dipole arm 320. The second sub-arm branch 322 is an H-shaped structure and is located between the two first sub-arm branches 321.

[0034] Specifically, the second sub-arm branch 322 is arranged in the middle of the dipole arm 320, and the middle of the second sub-arm branch 322 is perpendicularly connected to the middle of the dipole arm 320, and the two ends of the middle of the second sub-arm branch 322 first extend perpendicularly to the dipole arm 320 in the direction away from the dipole arm 320, so that the two ends of the middle of the second sub-arm branch 322 are respectively located on both sides of the dipole arm 320, and the two ends of the middle of the second sub-arm branch 322 are forked, so that the end parts of the middle of the second sub-arm branch 322 located on either side of the dipole arm 320 can be forked parallel to the dipole arm 320 and extend in the direction close to the corresponding two first sub-arm branches 321, thereby forming an H-shaped structure of the second sub-arm branch 322. The second sub-arm branch 322 and the two first sub-arm branches 321 form a three-segment branch structure on the dipole arm 320. This simplifies the overall electromagnetic transparency structure while achieving electromagnetic transparency, further meeting the frequency band coverage requirements and ensuring the smooth and effective construction of a multi-frequency common-aperture base station antenna array. The second sub-arm branch 322 and the first sub-arm branch 321 can be equivalent to a low-pass filter. By adjusting the branch lengths of the second sub-arm branch 322 and the first sub-arm branch 321, the suppression range of high-frequency harmonics can be adjusted to achieve wide electromagnetic transparency. The short side of the U-shaped first sub-arm branch 321 directly connected to the dipole arm 320 is 4 mm long, the long side of the U-shaped first sub-arm branch 321 indirectly connected to the dipole arm 320 is 7 mm long, and the width of the U-shaped first sub-arm branch 321 is 1 mm. The length of the short side of the second sub-arm branch 322 of the H-shaped structure directly connected to the dipole arm 320 is 4 mm, the length of the long side of the second sub-arm branch 322 of the H-shaped structure indirectly connected to the dipole arm 320 is 15 mm, and the width of the second sub-arm branch 322 of the H-shaped structure is 1 mm.

[0035] It should be noted that the second sub-arm branch 322 is not in direct contact with the corresponding two first sub-arm branch 321 .

[0036] In some specific embodiments of the present invention, referring to Figure 2 The first radiating layer 200 is provided with a first microstrip feed line 210 and a second microstrip feed line 220. A cutting groove is provided in the middle of the second microstrip feed line 220. The first microstrip feed line 210 is provided through the cutting groove.

[0037] Specifically, the first microstrip feeder 210 and the second microstrip feeder 220 are both arranged in the middle of the upper surface of the dielectric plate 100, and the first microstrip feeder 210 and the second microstrip feeder 220 are arranged in a cross-positioned relationship. A cutting groove is formed in the middle of the second microstrip feeder 220 through etching, cutting, and other operations, so that the second microstrip feeder 220 is formed into two sections and is located on both sides of the cutting groove. The first microstrip feeder 210 is arranged through the cutting groove, so that the first microstrip feeder 210 and the second microstrip feeder 220 are arranged cross-wise while avoiding overlap and direct contact between the first microstrip feeder 210 and the second microstrip feeder 220.

[0038] In some specific embodiments of the present invention, referring to Figure 3 A microstrip connecting line 330 is further provided in the second radiation layer 300. Both ends of the microstrip connecting line 330 are provided through the dielectric plate 100 and are respectively connected to the second microstrip feeder 220 on both sides of the cutting groove.

[0039] Specifically, the microstrip connecting line 330 is disposed in the middle of the lower surface of the dielectric plate 100. Both ends of the microstrip connecting line 330 pass through the dielectric plate 100 to the upper surface of the dielectric plate 100. The ends of the microstrip connecting line 330 are respectively connected to the two ends of the second microstrip feeder 220 located on either side of the cut groove after being cut. Thus, the provision of the microstrip connecting line 330 enables the connection between the two sections of the second microstrip feeder 220 while preventing overlap and direct contact between the first microstrip feeder 210 and the second microstrip feeder 220. The length of the microstrip connecting line 330 is 4.1 mm, the width of the middle portion of the microstrip connecting line 330 is 0.8 mm, and the width of the ends of the first microstrip feeder 210 is 1.3 mm.

[0040] Furthermore, first through holes are respectively provided at positions corresponding to the two sides of the cutting groove of the dielectric plate 100, and the two ends of the microstrip connecting line 330 are respectively passed through the two first through holes to the upper surface of the dielectric plate 100, so as to facilitate connection with the two sections of the second microstrip feed line 220, thereby ensuring the integrity of the second microstrip feed line 220.

[0041] In some specific embodiments of the present invention, referring to Figure 2 , the first microstrip feed line 210 and the second microstrip feed line 220 are arranged vertically.

[0042] Specifically, the first microstrip feed line 210 and the second microstrip feed line 220 are arranged perpendicularly, that is, the first microstrip feed line 210 is rotated 45° clockwise to simulate the excitation of 45° polarization, while the second microstrip feed line 220 is rotated 45° counterclockwise to simulate the excitation of -45° polarization. Among them, the length of the first microstrip feed line 210 is 11.4mm, the width of the middle part of the first microstrip feed line 210 is 0.8mm, and the width of the two ends of the first microstrip feed line 210 is 1.3mm. After being cut into two sections, the length of the second microstrip feed line 220 is 4.95mm, the width of the middle part of the second microstrip feed line 220 as a whole is 0.8mm, and the width of the two ends of the second microstrip feed line 220 as a whole is 1.3mm.

[0043] In some specific embodiments of the present invention, referring to Figure 1 Two coaxial cables 400 are provided, each of which is coaxially provided with an inner conductor and an outer conductor. The outer conductor of one coaxial cable 400 is connected to one of the main feed lines 310, and the inner conductor is sequentially passed through the main feed line 310 and the dielectric plate 100 to connect to the first microstrip feed line 210. The outer conductor of the other coaxial cable 400 is connected to the other main feed line 310, and the inner conductor is sequentially passed through the main feed line 310 and the dielectric plate 100 to connect to the second microstrip feed line 220.

[0044] Specifically, two shorting posts 500 are provided, and the two shorting posts 500 are corresponding to two of the main feeders 310. One end of one shorting post 500 is connected to the ground, and the other end is connected to the corresponding main feeder 310 and one end of the first microstrip feeder 210. The other shorting post 500 has one end connected to the ground, and the other end is connected to the corresponding main feeder 310 and one end of the second microstrip feeder 220. Two coaxial cables 400 are provided, and the two coaxial cables 400 are corresponding to the other two main feeders 310. In addition, each coaxial cable 400 includes a coaxial inner conductor and an outer conductor. The outer conductor of one of the coaxial cables 400 is connected to the corresponding main feeder 310, and the inner conductor of the coaxial cable 400 is sequentially passed through the corresponding main feeder 310 and the dielectric plate 100 and connected to the end of the first microstrip feeder 210 away from the short-circuit post 500. The outer conductor of the other coaxial cable 400 is connected to the corresponding main feeder 310, and the inner conductor of the coaxial cable 400 is sequentially passed through the corresponding main feeder 310 and the dielectric plate 100 and connected to the end of the second microstrip feeder 220 away from the short-circuit post 500.

[0045] Furthermore, the two main feed lines 310 corresponding to the two coaxial cables 400 are each provided with a second through hole to prevent the inner conductor of the coaxial cable 400 from directly contacting the corresponding main feed line 310 when connected to the second microstrip feed line 220 .

[0046] Test example Reference Figure 4 , shows the simulation results of the scattering parameters (S parameters) of the dual-polarized dipole antenna set according to the above structure. From the simulation results, it can be seen that when the amplitude of the reflection coefficient (S11) is less than -10dB, the frequency range is 1.71GHz to 2.2GHz, and its relative bandwidth exceeds 25.6%. In the frequency range of 1.71GHz to 2.2GHz, the isolation (S21) is better than 30dB.

[0047] Reference Figure 5 , shows the simulation results of the gain of the dual-polarized dipole antenna set according to the above structure. From the simulation results, it can be seen that when the frequency range is 1.71GHz to 2.2GHz, the gain of the antenna is stable, among which the highest gain is 7.8dBi, and the gain at the center frequency of 1.95GHz is 7.6dBi.

[0048] Reference Figure 6 , shows the simulation results of the half-power beamwidth of the dual-polarized dipole antenna set according to the above structure. From the simulation results, it can be seen that when the frequency is in the range of 1.71GHz to 2.2GHz, the half-power beamwidth of the antenna is stable.

[0049] Reference Figure 7 , shows the simulation results of the center frequency radiation pattern of the dual-polarized dipole antenna set according to the above structure. From the simulation results, it can be seen that when the center frequency is 1.95GHz, the antenna gain is 7.6dBi, and its axial cross-polarization ratio is greater than 30dB.

[0050] Reference Figure 8 , shows a simulation diagram of the application of a dual-polarized dipole antenna configured according to the above structure in a tri-band co-aperture base station antenna array. The dual-polarized dipole antenna configured according to the above structure is located at the center of the array, with four high-frequency antenna units 600 distributed between it and the ground, capable of covering the 3.3 GHz to 4.2 GHz and 4.8 GHz to 5 GHz frequency bands.

[0051] Reference Figure 9 , showing Figure 8 The directional pattern of the two high-frequency antenna units 600 located on the left side at a frequency of 3.75 GHz when excited, refer to Figure 10 , showing Figure 8The radiation patterns of the two high-frequency antenna units 600 on the left side at a frequency of 4.9 GHz when excited, can be seen from the simulation results, whether at a frequency of 3.75 GHz or at a frequency of 4.9 GHz, the radiation patterns of the above two high-frequency antenna units 600 do not produce obvious distortion, and can still maintain good and stable radiation. Therefore, it is explained that the dual-polarized dipole antenna arranged according to the above structure has broadband electromagnetic transparency characteristics in the three-frequency co-aperture base station antenna array.

[0052] In summary, the dual-polarized dipole antenna configured according to the above structure can operate stably in the frequency range of 1.71 GHz to 2.2 GHz, with a reflection coefficient of less than -10 dB in the frequency range of 1.71 GHz to 2.2 GHz, an isolation better than 30 dB in the frequency range of 1.71 GHz to 2.2 GHz, and a gain of 7.6 dBi at the center frequency of 1.95 GHz.

[0053] Furthermore, when the multi-frequency co-aperture base station antenna array constructed is a three-band base station antenna array, the dual-polarized dipole antenna arranged according to the above structure can achieve electromagnetic transparency characteristics in the frequency ranges of 3.3GHz to 4.2GHz and 4.8GHz to 5GHz, that is, the high-frequency antenna unit 600 operating in the frequency ranges of 3.3GHz to 4.2GHz and 4.8GHz to 5GHz can maintain good and stable characteristic radiation.

[0054] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-polarized dipole antenna, characterized in that: include: a dielectric plate (100); a first radiation layer (200), which is arranged on the upper surface of the dielectric plate (100) and connected to the coaxial cable (400); a second radiation layer (300), which is disposed on the lower surface of the dielectric plate (100) and connected to the coaxial cable (400); The second radiation layer (300) is provided with a main body feed line (310) and a dipole arm (320); A plurality of the main body feed lines (310) are provided, and the plurality of the main body feed lines (310) are rotationally symmetrically arranged with the center of the dielectric plate (100) as an axis, and a spacing space is formed between each two adjacent main body feed lines (310); A plurality of the dipole arms (320) are provided, and the plurality of the dipole arms (320) are rotationally symmetrically arranged with the center of the dielectric plate (100) as an axis, and the plurality of the dipole arms (320) are arranged in a one-to-one correspondence with the plurality of the interval spaces, and the dipole arms (320) are located in the corresponding interval spaces.

2. The dual-polarized dipole antenna according to claim 1, wherein: Four main body feeders (310) are provided, and the main body feeders (310) are L-shaped structures; Four dipole arms (320) are provided, and the four dipole arms (320) are respectively located in the four interval spaces.

3. The dual-polarized dipole antenna according to claim 2, wherein: A first feeder branch (311) is provided on a side of the main feeder (310) away from the dipole arm (320); Two first feeder branch nodes (311) are provided, both of which are L-shaped structures. The two first feeder branch nodes (311) are respectively located at two ends of the main feeder (310) and are symmetrically arranged with the bending point of the main feeder (310) as an axis.

4. The dual-polarized dipole antenna according to claim 3, wherein: A second feeder branch (312) is provided on a side of the main feeder (310) away from the dipole arm (320); The second feeder branch (312) is a T-shaped structure and is located at the bend of the main feeder (310).

5. The dual-polarized dipole antenna according to claim 2, wherein: Both ends of the dipole arm (320) are respectively provided with first sub-arm branches (321); The two first sub-arm branches (321) are both U-shaped structures and are symmetrically arranged with the center of the dipole arm (320) as an axis.

6. The dual-polarized dipole antenna according to claim 5, wherein: A second sub-arm branch (322) is provided in the middle of the dipole arm (320); The second sub-arm branch (322) is an H-shaped structure and is located between the two first sub-arm branch sections (321).

7. The dual-polarized dipole antenna according to claim 2, wherein: The first radiation layer (200) is provided with a first microstrip feed line (210) and a second microstrip feed line (220); A cutting groove is provided in the middle of the second microstrip feed line (220); The first microstrip feed line (210) is arranged through the cutting groove.

8. The dual-polarized dipole antenna according to claim 7, wherein: A microstrip connecting line (330) is also provided in the second radiation layer (300); Both ends of the microstrip connecting line (330) are arranged through the dielectric plate (100) and are respectively connected to the second microstrip feeder (220) on both sides of the cutting groove.

9. The dual-polarized dipole antenna according to claim 7 or 8, characterized in that: The first microstrip feed line (210) and the second microstrip feed line (220) are arranged vertically.

10. The dual-polarized dipole antenna according to claim 7, wherein: Two coaxial cables (400) are provided, and each coaxial cable (400) is coaxially provided with an inner conductor and an outer conductor; The outer conductor of one of the coaxial cables (400) is connected to one of the main feed lines (310), and the inner conductor is sequentially passed through the main feed line (310) and the dielectric plate (100) and connected to the first microstrip feed line (210); The outer conductor of another coaxial cable (400) is connected to another main body feeder (310), and the inner conductor is sequentially passed through the main body feeder (310) and the dielectric plate (100) and connected to the second microstrip feeder (220).

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