Dual polarized double-fed electromagnetic electric dipole antenna

Abstract

The application provides a dual-polarized double-fed electromagnetic electric dipole antenna, which comprises a first dielectric substrate, a second dielectric substrate, a metal ground, a first coaxial cable, a second coaxial cable, a first 1:2 power divider, a second 1:2 power divider, four radiators and four inverted U-shaped metal probes; the second dielectric substrate, the metal ground and the first dielectric substrate are sequentially and horizontally stacked from bottom to top; the first 1:2 power divider is printed on the upper surface of the first dielectric substrate, and the second 1:2 power divider is printed on the lower surface of the second dielectric substrate; the four radiators and the four inverted U-shaped metal probes are arranged on the first dielectric substrate. The dual-polarized double-fed electromagnetic electric dipole antenna provided by the application realizes a stable high gain greater than 9.7 dB and an extremely high port isolation better than 30 dB in a wide frequency band of 1.7-2.7 GHz, and significantly improves the radiation efficiency and the gain stability while maintaining a relative wide band of 45.5%.

Description

Technical Field

[0001] This invention relates to the field of communication antennas, and more specifically to a dual-polarized doubly-fed electromagnetic dipole antenna. Background Technology

[0002] With the commercial deployment of 5G communication technology and the evolution of future 6G technology, mobile communication systems are placing unprecedentedly high demands on the performance of base station antennas. Traditional dual-polarized base station antennas mostly adopt printed dipole or microstrip patch solutions. Among them, printed dipoles have the advantage of low cost, but their bandwidth is relatively narrow, limiting gain improvement; microstrip patch antennas have the advantage of low profile, but they suffer from narrow bandwidth and low power capacity, and there is an inherent contradiction between high gain and wide bandwidth.

[0003] In contrast, electromagnetic dipole antennas, as an emerging solution, combine electric and magnetic dipoles, utilizing their complementary radiation characteristics to achieve wide bandwidth, stable radiation patterns, and high front-to-back ratio. However, existing electromagnetic dipoles typically require the separate manufacturing of the electric and magnetic components before assembly, resulting in complex structures, high assembly precision requirements, and increased costs.

[0004] Regarding power feeding, direct coaxial probe feeding is simple but has limited bandwidth; slot coupling feeding has a wider bandwidth but is extremely sensitive to machining accuracy, and there is room for further improvement in energy coupling efficiency. Probe feeding is an effective broadband matching method, but how to apply it to a complex electromagnetic dipole structure and solve the mutual coupling problem between multiple probes and multiple ports is a challenge in achieving high performance.

[0005] It is evident that existing electromagnetic dipole antennas suffer from complex structures and high manufacturing costs, and cannot simultaneously achieve both bandwidth and energy coupling efficiency, thus requiring further improvement and refinement. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a dual-polarized, doubly-fed electromagnetic dipole antenna that achieves wide-bandwidth, high-gain, and high-isolation antenna radiation characteristics through a simple structure and low manufacturing cost.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A dual-polarized doubly-fed electromagnetic dipole antenna includes a first dielectric substrate, a second dielectric substrate, a metal ground, a first coaxial cable, a second coaxial cable, a first 1-to-2 power divider, a second 1-to-2 power divider, four radiators, and four inverted U-shaped metal probes.

[0009] The second dielectric substrate, the metal ground, and the first dielectric substrate are horizontally stacked in sequence from bottom to top; the first 1-to-2 power divider is printed on the upper surface of the first dielectric substrate, and the second 1-to-2 power divider is printed on the lower surface of the second dielectric substrate; the four radiators and the four inverted U-shaped metal probes are disposed on the first dielectric substrate.

[0010] Each radiator includes an integrally formed top plate and two side plates, all of which are square metal plates. The top plate is arranged parallel above the first dielectric substrate, and the two side plates are arranged vertically and connected perpendicularly to each other. Two adjacent sides of the top plate are perpendicularly connected to the upper ends of the two side plates, and the lower ends of the two side plates are perpendicularly connected to the first dielectric substrate. The intersection of the top plate and the two side plates is oriented towards the center of the first dielectric substrate, such that the center of the first dielectric substrate is located on the extension line of the angle bisector of the two side plates.

[0011] The four radiators are arranged symmetrically around the center of the first dielectric substrate with a period of 90°. In the circumferential direction, the side plates of each pair of adjacent radiators are spaced a certain distance apart, so that the four radiators form a cross-shaped gap channel.

[0012] The four radiators are arranged clockwise as a first radiator, a second radiator, a third radiator, and a fourth radiator; the four inverted U-shaped metal probes are respectively a first inverted U-shaped metal probe, a second inverted U-shaped metal probe, a third inverted U-shaped metal probe, and a fourth inverted U-shaped metal probe; wherein, the first inverted U-shaped metal probe is disposed in the gap channel between the first and second radiators, the second inverted U-shaped metal probe is disposed in the gap channel between the second and third radiators, the third inverted U-shaped metal probe is disposed in the gap channel between the third and fourth radiators, and the fourth inverted U-shaped metal probe is disposed in the gap channel between the fourth radiator and the first radiator;

[0013] The first coaxial cable feeds the first inverted U-shaped metal probe and the third inverted U-shaped metal probe with equal amplitude and in phase through the first 1-to-2 power divider; the first inverted U-shaped metal probe couples and feeds the first radiator and the second radiator, so that the first radiator and the second radiator form a pair of dipole radiators; the third inverted U-shaped metal probe couples and feeds the third radiator and the fourth radiator, so that the third radiator and the fourth radiator form a pair of dipole radiators;

[0014] The second coaxial cable feeds the second inverted U-shaped metal probe and the fourth inverted U-shaped metal probe with equal amplitude and in phase through the second 1-to-2 power divider; the second inverted U-shaped metal probe couples and feeds the second radiator and the third radiator, so that the second radiator and the third radiator form a pair of dipole radiators; the fourth inverted U-shaped metal probe couples and feeds the first radiator and the fourth radiator, so that the first radiator and the fourth radiator form a pair of dipole radiators;

[0015] The above feeding structure enables the four radiators to form four pairs of dipole radiators in the form of a shared radiator.

[0016] Furthermore, the first dielectric substrate and the second dielectric substrate are provided with slots for connecting the radiator, and the lower end of the side plate of the radiator is provided with a protruding connecting portion; the connecting portion at the lower end of the side plate passes vertically through the slots on the first dielectric substrate and the second dielectric substrate to fix the radiator on the first dielectric substrate; when the connecting portion at the lower end of the side plate passes through the slots, it is also electrically connected to the metal ground disposed between the first dielectric substrate and the second dielectric substrate to electrically connect the radiator to the metal ground.

[0017] Furthermore, each inverted U-shaped metal probe includes a first metal strip, a second metal strip, and a third metal strip connected end to end in sequence. The second metal strip is horizontally positioned, while the first and third metal strips are vertically positioned and parallel to each other. The two ends of the second metal strip are vertically connected to the upper ends of the first and second metal strips, respectively. The middle part of the second metal strip is supported on the first dielectric substrate by a nylon column. The lower end of the first metal strip passes vertically through the first and second dielectric substrates in sequence to fix the inverted U-shaped metal probe on the first dielectric substrate. The length of the first metal strip is greater than that of the third metal strip, so that the lower end of the third metal strip is suspended in the air. A slot is provided on the metal ground corresponding to the position through which the first metal strip passes. The area of ​​the slot is larger than the cross-section of the first metal strip, so that the metal ground and the inverted U-shaped metal probe do not contact each other.

[0018] Furthermore, on the upper surface of the first dielectric substrate, one output terminal of the first 1-to-2 power divider is connected to the lower end of the first metal strip of the first inverted U-shaped metal probe, and the other output terminal of the first 1-to-2 power divider is connected to the lower end of the first metal strip of the third inverted U-shaped metal probe.

[0019] On the lower surface of the second dielectric substrate, one output terminal of the second 1-to-2 power divider is connected to the lower end of the first metal strip of the second inverted U-shaped metal probe, and the other output terminal of the second 1-to-2 power divider is connected to the lower end of the first metal strip of the fourth inverted U-shaped metal probe.

[0020] Furthermore, the first metal strip of the first inverted U-shaped metal probe is disposed on the side close to the second radiator for coupling and feeding power to the second radiator; the third metal strip of the first inverted U-shaped metal probe is disposed on the side close to the first radiator for coupling and feeding power to the first radiator.

[0021] The first metal strip of the second inverted U-shaped metal probe is disposed on the side close to the third radiator for coupling power to the third radiator; the third metal strip of the second inverted U-shaped metal probe is disposed on the side close to the second radiator for coupling power to the second radiator.

[0022] The first metal strip of the third inverted U-shaped metal probe is disposed on the side close to the third radiator for coupling and feeding power to the third radiator; the third metal strip of the third inverted U-shaped metal probe is disposed on the side close to the fourth radiator for coupling and feeding power to the fourth radiator.

[0023] The first metal strip of the fourth inverted U-shaped metal probe is disposed on the side close to the fourth radiator and is used to couple and feed power to the fourth radiator; the third metal strip of the fourth inverted U-shaped metal probe is disposed on the side close to the first radiator and is used to couple and feed power to the first radiator.

[0024] Furthermore, both the first and second coaxial cables are introduced from below the second dielectric substrate; the inner conductor of the first coaxial cable passes through the second dielectric substrate, the metal ground, and the first dielectric substrate in sequence, and is then connected to the input terminal of the first 1-to-2 power divider; the outer conductor of the first coaxial cable passes through the second dielectric substrate and is then connected to the metal ground; the inner conductor of the second coaxial cable is connected to the input terminal of the second 1-to-2 power divider, and the outer conductor of the second coaxial cable is connected to the metal ground through a metallized via penetrating the second dielectric substrate.

[0025] Furthermore, a metal fence is also provided on the first dielectric substrate, and the metal fence is fixedly connected to the edge of the first dielectric substrate to surround the four radiators on the first dielectric substrate.

[0026] Furthermore, the dielectric constant of the first dielectric substrate and the second dielectric substrate is 4.6, and the thickness of both is 0.762 mm.

[0027] This invention provides a dual-polarized, doubly-fed electromagnetic dipole antenna that achieves a stable high gain greater than 9.7 dB and an extremely high port isolation better than 30 dB within a wide bandwidth of 1.7-2.7 GHz. While maintaining a relative bandwidth of 45.5%, it significantly improves radiation efficiency and gain stability. This invention combines wide bandwidth, high gain, and high isolation with structural robustness, high power capacity, and low manufacturing cost. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of a dual-polarized doubly-fed electromagnetic dipole antenna provided in an embodiment of the present invention.

[0029] Figure 2 This is an exploded view of the structure of a dual-polarized doubly-fed electromagnetic dipole antenna provided in an embodiment of the present invention.

[0030] Figure 3 This is a schematic diagram of the structure of the radiator in an embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of the inverted U-shaped metal probe in an embodiment of the present invention.

[0032] Figure 5 This is a schematic diagram of the upper surface structure of the first dielectric substrate in an embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram of the lower surface structure of the second dielectric substrate in an embodiment of the present invention.

[0034] Figure 7 This is an S-parameter curve diagram of an embodiment of the present invention.

[0035] Figure 8 This is an antenna gain curve diagram of an embodiment of the present invention.

[0036] Figure 9 This is the radiation pattern of an embodiment of the present invention at a center frequency of 1.7 GHz.

[0037] Figure 10 This is the radiation pattern of an embodiment of the present invention at a center frequency of 2.2 GHz.

[0038] Figure 11 This is the radiation pattern of an embodiment of the present invention at a center frequency of 2.7 GHz. Detailed Implementation

[0039] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1 and Figure 2 As shown in the figure, an embodiment of the present invention provides a dual-polarized dual-fed electromagnetic dipole antenna, including a first dielectric substrate 11, a second dielectric substrate 12, a metal ground 2, a first coaxial cable 71, a second coaxial cable 72, a first 1-to-2 power divider 61, a second 1-to-2 power divider 62, four radiators 4, and four inverted U-shaped metal probes 5.

[0041] Specifically, the dielectric constant of the first dielectric substrate 11 and the second dielectric substrate 12 is 4.6, and the thickness of both is 0.762 mm. The second dielectric substrate 12, the metal ground 2, and the first dielectric substrate 11 are horizontally stacked from bottom to top; the first power divider 61 is printed on the upper surface of the first dielectric substrate 11, and the second power divider 62 is printed on the lower surface of the second dielectric substrate 12; the four radiators 4 and the four inverted U-shaped metal probes 5 are disposed on the first dielectric substrate 11.

[0042] Combination Figure 2 and Figure 3 As shown, each radiator 4 includes an integrally formed top plate 401 and two side plates 402, both of which are square metal plates. The top plate 401 is arranged parallel above the first dielectric substrate 11, and the two side plates 402 are both vertically arranged and perpendicularly connected to each other. The two adjacent sides of the top plate 401 are perpendicularly connected to the upper ends of the two side plates 402, and the lower ends of the two side plates 402 are perpendicularly connected to the first dielectric substrate 11. The intersection of the top plate 401 and the two side plates 402 is oriented toward the center of the first dielectric substrate 11, and the center of the first dielectric substrate 11 is located on the extension line of the angle bisector of the two side plates 402.

[0043] The four radiators 4 are arranged symmetrically around the center of the first dielectric substrate 11 with a period of 90°. In the circumferential direction, the side plates 402 of each pair of adjacent radiators 4 are spaced at a certain distance, so that the four radiators 4 form a cross-shaped gap channel.

[0044] Combination Figure 2 As shown, the four radiators 4 are arranged clockwise as follows: first radiator 41, second radiator 42, third radiator 43, and fourth radiator 44; the four inverted U-shaped metal probes 5 are respectively: first inverted U-shaped metal probe 51, second inverted U-shaped metal probe 52, third inverted U-shaped metal probe 53, and fourth inverted U-shaped metal probe 54; wherein, the first inverted U-shaped metal probe 51 is disposed in the gap channel between the first radiator 41 and the second radiator 42, the second inverted U-shaped metal probe 52 is disposed in the gap channel between the second radiator 42 and the third radiator 43, the third inverted U-shaped metal probe 53 is disposed in the gap channel between the third radiator 43 and the fourth radiator 44, and the fourth inverted U-shaped metal probe 54 is disposed in the gap channel between the fourth radiator 44 and the first radiator 41.

[0045] The first coaxial cable 71 is fed to the first inverted U-shaped metal probe 51 and the third inverted U-shaped metal probe 53 with equal amplitude and in phase through the first one-to-two power divider 61; the first inverted U-shaped metal probe 51 is coupled to the first radiator 41 and the second radiator 42, so that the first radiator 41 and the second radiator 42 form a pair of dipole radiators; the third inverted U-shaped metal probe 51 is coupled to the third radiator 43 and the fourth radiator 44, so that the third radiator 43 and the fourth radiator 44 form a pair of dipole radiators.

[0046] The second coaxial cable 72 feeds the second inverted U-shaped metal probe 52 and the fourth inverted U-shaped metal probe 54 with equal amplitude and in phase through the second one-to-two power divider 62; the second inverted U-shaped metal probe 52 couples and feeds the second radiator 42 and the third radiator 43, so that the second radiator 42 and the third radiator 43 form a pair of dipole radiators; the fourth inverted U-shaped metal probe 54 couples and feeds the first radiator 41 and the fourth radiator 44, so that the first radiator 41 and the fourth radiator 44 form a pair of dipole radiators;

[0047] The above feeding structure enables the four radiators 4 to form four pairs of dipole radiators in the form of a shared radiator.

[0048] Combination Figure 3 , Figure 5 and Figure 6 As shown, the first dielectric substrate 11 and the second dielectric substrate 12 are provided with slots 10 for connecting the radiator 4, and the lower end of the side plate 402 of the radiator 4 is provided with a protruding connecting portion 400; the connecting portion 400 at the lower end of the side plate 402 passes vertically through the slots 10 on the first dielectric substrate 11 and the second dielectric substrate 12 to fix the radiator 4 on the first dielectric substrate 11; when the connecting portion 400 at the lower end of the side plate 402 passes through the slots 10, it is also electrically connected to the metal ground 2 disposed between the first dielectric substrate 11 and the second dielectric substrate 12 to electrically connect the radiator 4 to the metal ground 2.

[0049] like Figure 4As shown, each inverted U-shaped metal probe 5 includes a first metal strip 501, a second metal strip 502, and a third metal strip 503 connected end to end in sequence. The second metal strip 502 is horizontally arranged, while the first metal strip 501 and the third metal strip 503 are vertically arranged and parallel to each other. The two ends of the second metal strip 502 are vertically connected to the upper ends of the first metal strip 501 and the second metal strip 502, respectively. The middle part of the second metal strip 502 is supported on the first dielectric substrate 11 by a nylon column 500. The lower end of the first metal strip 501 passes vertically through the first dielectric substrate 11 and the second dielectric substrate 12 in sequence to fix the inverted U-shaped metal probe 5 on the first dielectric substrate 11. The length of the first metal strip 501 is greater than that of the third metal strip 503, so that the lower end of the third metal strip 503 is suspended in the air. The metal ground 2 is provided with a slot corresponding to the position through which the first metal strip 501 passes. The area of ​​the slot is greater than the cross-section of the first metal strip 501, so that the metal ground 2 and the inverted U-shaped metal probe 5 do not contact each other.

[0050] Furthermore, the first metal strip 501 of the first inverted U-shaped metal probe 51 is disposed on the side close to the second radiator 42 for coupling power to the second radiator 42; the third metal strip 503 of the first inverted U-shaped metal probe 51 is disposed on the side close to the first radiator 41 for coupling power to the first radiator 41.

[0051] The first metal strip 501 of the second inverted U-shaped metal probe 52 is disposed on the side close to the third radiator 43 for coupling and feeding power to the third radiator 43; the third metal strip 503 of the second inverted U-shaped metal probe 52 is disposed on the side close to the second radiator 42 for coupling and feeding power to the second radiator 42.

[0052] The first metal strip 501 of the third inverted U-shaped metal probe 53 is disposed on the side close to the third radiator 43 for coupling and feeding power to the third radiator 43; the third metal strip 503 of the third inverted U-shaped metal probe 53 is disposed on the side close to the fourth radiator 44 for coupling and feeding power to the fourth radiator 44.

[0053] The first metal strip 501 of the fourth inverted U-shaped metal probe 54 is disposed on the side close to the fourth radiator 44 and is used to couple and feed power to the fourth radiator 44; the third metal strip 503 of the fourth inverted U-shaped metal probe 54 is disposed on the side close to the first radiator 41 and is used to couple and feed power to the first radiator 41.

[0054] Combination Figure 5 and Figure 6As shown, both the first coaxial cable 71 and the second coaxial cable 72 are introduced from below the second dielectric substrate 12; the inner conductor of the first coaxial cable 71 passes through the second dielectric substrate 12, the metal ground 2 and the first dielectric substrate 11 in sequence, and is connected to the input terminal of the first 1-to-2 power divider 61; the outer conductor of the first coaxial cable 71 passes through the second dielectric substrate 12 and is connected to the metal ground 2; the inner conductor of the second coaxial cable 72 is connected to the input terminal of the second 1-to-2 power divider 62, and the outer conductor of the second coaxial cable 72 is connected to the metal ground 2 through a metallized via penetrating the second dielectric substrate 12.

[0055] On the upper surface of the first dielectric substrate 11, one output terminal of the first one-to-two power divider 61 is connected to the lower end of the first metal strip 501 of the first inverted U-shaped metal probe 51, and the other output terminal of the first one-to-two power divider 61 is connected to the lower end of the first metal strip 501 of the third inverted U-shaped metal probe 53.

[0056] On the lower surface of the second dielectric substrate 12, one output terminal of the second one-to-two power divider 62 is connected to the lower end of the first metal strip 501 of the second inverted U-shaped metal probe 52, and the other output terminal of the second one-to-two power divider 62 is connected to the lower end of the first metal strip 501 of the fourth inverted U-shaped metal probe 54.

[0057] The radiator 4 used in this embodiment of the invention has multiple resonant modes. Combined with the additional resonance of the inverted U-shaped metal probe 5, it can synergistically generate an impedance bandwidth exceeding 45.5%, perfectly covering the 1.7-2.7 GHz frequency band. The four radiators 4 are distributed in a rotationally symmetrical manner on the first dielectric substrate 11, forming a 2×2 antenna array. By having two polarizations share a single radiator 4, the antenna exhibits high gain characteristics in the radiation direction. The first coaxial cable 71 and the second coaxial cable 72 are fed through the first 1-to-2 power divider 61 and the second 1-to-2 power divider 62 with polarization directions of +45° and -45°, respectively. Furthermore, the four inverted U-shaped metal probes 5 separately feed the two polarizations of the antenna, allowing the two polarizations to operate simultaneously without interference. Based on these structural features, the rotationally symmetrical radiation and feeding structure provides an inherent decoupling mechanism for the antenna. Combined with the spatially separated double-layer feeding network, the isolation between the two polarization ports of the antenna easily exceeds 30 dB across the entire frequency band.

[0058] Furthermore, in this embodiment of the invention, a one-piece molded metal radiator 4 is used, which has a simple structure, is easy to manufacture, and has high power capacity and excellent heat dissipation performance; while the structure and power feeding method of the inverted U-shaped metal probe 5 effectively avoid the risk of passive intermodulation. In addition, the one-piece molded structure of the radiator 4 and the inverted U-shaped metal probe 5 enables the modular design of this invention, which has the advantages of simple assembly and good consistency, and is extremely suitable for large-scale industrial production.

[0059] As an improvement, combined Figure 1 and Figure 2 As shown, a metal fence 3 is also provided on the first dielectric substrate 11. The metal fence 3 is fixedly connected to the edge of the first dielectric substrate 11 to surround the four radiators 4 on the first dielectric substrate 11. The metal fence 3 can reduce useless energy loss, improve the radiation efficiency of the antenna, and act as a choke. Specifically, the metal fence 3 effectively reduces sidelobe and backlobe radiation by suppressing current diffraction at the edge of the antenna aperture, concentrating more energy in the main radiation direction, which directly contributes to achieving a high gain of greater than 9.7 dB. Especially when using the embodiments of the present invention to form an antenna array, the metal fence 3 can ensure the regularity of the array pattern. At the same time, as an effective decoupling structure, the metal fence 3 can further block the near-field coupling path between the two polarization ports, helping to achieve a high isolation of better than 30 dB.

[0060] Figure 7 The figure shows the S-parameter curves of an embodiment of the present invention. As can be seen from the figure, the impedance matching |S11| < –10dB in the 1.7-2.7GHz frequency band of the embodiment of the present invention. Figure 8 This is an antenna gain curve of an embodiment of the present invention. The results show that the embodiment of the present invention has a high gain of 9.7-11.5 dB in the 1.7-2.7 GHz frequency band.

[0061] Figure 9 The radiation patterns of this invention are shown in the embodiment at a center frequency of 1.7 GHz, with Phi at 0° and 90°. Figure 10 The radiation patterns of this invention are shown in the embodiment at a center frequency of 2.2 GHz, with Phi at 0° and 90°. Figure 11 This is a radiation pattern of the present invention at a center frequency of 2.7 GHz, with Phi at 0° and 90°. Figures 9 to 11 The results shown demonstrate that the embodiments of the present invention exhibit a stable radiation pattern, low cross-polarization level, and high front-to-back ratio throughout the entire operating frequency band, laying a solid foundation for forming high-quality beams.

[0062] In summary, the relative bandwidth of this embodiment of the invention is 45.5%, simultaneously possessing high power capacity, low passive intermodulation, and excellent radiation pattern stability in the 1.7-2.7 GHz frequency band. In 4G / 5G mobile communication systems, 1.7-2.7 GHz is an important frequency range, covering multiple bands such as LTE Band 1, Band 3, Band 4, Band 7, and 5G n1 / n3 / n7. The excellent radiation performance in this frequency band makes this embodiment of the invention have broad application prospects.

[0063] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A dual-polarized, doubly-fed electromagnetic dipole antenna, characterized in that, It includes a first dielectric substrate, a second dielectric substrate, a metal ground, a first coaxial cable, a second coaxial cable, a first 1-to-2 power divider, a second 1-to-2 power divider, four radiators, and four inverted U-shaped metal probes. The second dielectric substrate, the metal ground, and the first dielectric substrate are horizontally stacked in sequence from bottom to top; the first 1-to-2 power divider is printed on the upper surface of the first dielectric substrate, and the second 1-to-2 power divider is printed on the lower surface of the second dielectric substrate; the four radiators and the four inverted U-shaped metal probes are disposed on the first dielectric substrate. Each radiator includes an integrally formed top plate and two side plates, all of which are square metal plates. The top plate is arranged parallel above the first dielectric substrate, and the two side plates are arranged vertically and connected perpendicularly to each other. Two adjacent sides of the top plate are perpendicularly connected to the upper ends of the two side plates, and the lower ends of the two side plates are perpendicularly connected to the first dielectric substrate. The intersection of the top plate and the two side plates is oriented towards the center of the first dielectric substrate, such that the center of the first dielectric substrate is located on the extension line of the angle bisector of the two side plates. The four radiators are arranged symmetrically around the center of the first dielectric substrate with a period of 90°. In the circumferential direction, the side plates of each pair of adjacent radiators are spaced a certain distance apart, so that the four radiators form a cross-shaped gap channel. The four radiators are arranged clockwise as a first radiator, a second radiator, a third radiator, and a fourth radiator; the four inverted U-shaped metal probes are respectively a first inverted U-shaped metal probe, a second inverted U-shaped metal probe, a third inverted U-shaped metal probe, and a fourth inverted U-shaped metal probe; wherein, the first inverted U-shaped metal probe is disposed in the gap channel between the first and second radiators, the second inverted U-shaped metal probe is disposed in the gap channel between the second and third radiators, the third inverted U-shaped metal probe is disposed in the gap channel between the third and fourth radiators, and the fourth inverted U-shaped metal probe is disposed in the gap channel between the fourth radiator and the first radiator; The first coaxial cable feeds the first inverted U-shaped metal probe and the third inverted U-shaped metal probe with equal amplitude and in phase through the first 1-to-2 power divider; the first inverted U-shaped metal probe couples and feeds the first radiator and the second radiator, so that the first radiator and the second radiator form a pair of dipole radiators; the third inverted U-shaped metal probe couples and feeds the third radiator and the fourth radiator, so that the third radiator and the fourth radiator form a pair of dipole radiators; The second coaxial cable feeds the second inverted U-shaped metal probe and the fourth inverted U-shaped metal probe with equal amplitude and in phase through the second 1-to-2 power divider; the second inverted U-shaped metal probe couples and feeds the second radiator and the third radiator, so that the second radiator and the third radiator form a pair of dipole radiators; the fourth inverted U-shaped metal probe couples and feeds the first radiator and the fourth radiator, so that the first radiator and the fourth radiator form a pair of dipole radiators; The above feeding structure enables the four radiators to form four pairs of dipole radiators in the form of a shared radiator.

2. The dual-polarized doubly-fed electromagnetic dipole antenna according to claim 1, characterized in that, The first dielectric substrate and the second dielectric substrate are provided with slots for connecting the radiator, and the lower end of the side plate of the radiator is provided with a protruding connecting part; the connecting part at the lower end of the side plate passes vertically through the slots on the first dielectric substrate and the second dielectric substrate to fix the radiator on the first dielectric substrate; when the connecting part at the lower end of the side plate passes through the slots, it is also electrically connected to the metal ground disposed between the first dielectric substrate and the second dielectric substrate to electrically connect the radiator to the metal ground.

3. The dual-polarized doubly-fed electromagnetic dipole antenna according to claim 1, characterized in that, Each inverted U-shaped metal probe includes a first metal strip, a second metal strip, and a third metal strip connected end to end. The second metal strip is horizontally positioned, while the first and third metal strips are vertically positioned and parallel to each other. The two ends of the second metal strip are vertically connected to the upper ends of the first and second metal strips, respectively. The middle part of the second metal strip is supported on the first dielectric substrate by a nylon post. The lower end of the first metal strip passes vertically through the first and second dielectric substrates in sequence to fix the inverted U-shaped metal probe to the first dielectric substrate. The length of the first metal strip is greater than that of the third metal strip, so that the lower end of the third metal strip is suspended in the air. A slot is provided on the metal ground corresponding to the position where the first metal strip passes through. The area of ​​the slot is larger than the cross-section of the first metal strip, so that the metal ground and the inverted U-shaped metal probe do not contact each other.

4. The dual-polarized doubly-fed electromagnetic dipole antenna according to claim 3, characterized in that, On the upper surface of the first dielectric substrate, one output terminal of the first 1-to-2 power divider is connected to the lower end of the first metal strip of the first inverted U-shaped metal probe, and the other output terminal of the first 1-to-2 power divider is connected to the lower end of the first metal strip of the third inverted U-shaped metal probe. On the lower surface of the second dielectric substrate, one output terminal of the second 1-to-2 power divider is connected to the lower end of the first metal strip of the second inverted U-shaped metal probe, and the other output terminal of the second 1-to-2 power divider is connected to the lower end of the first metal strip of the fourth inverted U-shaped metal probe.

5. The dual-polarized doubly-fed electromagnetic dipole antenna according to claim 4, characterized in that, The first metal strip of the first inverted U-shaped metal probe is disposed on the side close to the second radiator for coupling and feeding power to the second radiator; the third metal strip of the first inverted U-shaped metal probe is disposed on the side close to the first radiator for coupling and feeding power to the first radiator. The first metal strip of the second inverted U-shaped metal probe is disposed on the side close to the third radiator for coupling power to the third radiator; the third metal strip of the second inverted U-shaped metal probe is disposed on the side close to the second radiator for coupling power to the second radiator. The first metal strip of the third inverted U-shaped metal probe is disposed on the side close to the third radiator for coupling and feeding power to the third radiator; the third metal strip of the third inverted U-shaped metal probe is disposed on the side close to the fourth radiator for coupling and feeding power to the fourth radiator. The first metal strip of the fourth inverted U-shaped metal probe is disposed on the side close to the fourth radiator and is used to couple and feed power to the fourth radiator; the third metal strip of the fourth inverted U-shaped metal probe is disposed on the side close to the first radiator and is used to couple and feed power to the first radiator.

6. The dual-polarized doubly-fed electromagnetic dipole antenna according to claim 4, characterized in that, Both the first and second coaxial cables are introduced from below the second dielectric substrate; the inner conductor of the first coaxial cable passes through the second dielectric substrate, the metal ground, and the first dielectric substrate in sequence, and is then connected to the input terminal of the first 1-to-2 power divider; the outer conductor of the first coaxial cable passes through the second dielectric substrate and is then connected to the metal ground; the inner conductor of the second coaxial cable is connected to the input terminal of the second 1-to-2 power divider, and the outer conductor of the second coaxial cable is connected to the metal ground through a metallized via penetrating the second dielectric substrate.

7. The dual-polarized doubly-fed electromagnetic dipole antenna according to claim 1, characterized in that, The first dielectric substrate is also provided with a metal fence, which is fixedly connected to the edge of the first dielectric substrate to surround the four radiators on the first dielectric substrate.

8. The dual-polarized doubly-fed electromagnetic dipole antenna according to claim 1, characterized in that, The dielectric constant of the first dielectric substrate and the second dielectric substrate is 4.6, and the thickness of both is 0.762 mm.

Images