A 5G dual-band omnidirectional antenna

Abstract

The present invention discloses a 5G dual-frequency omnidirectional antenna, which belongs to the field of antenna technology. The 5G dual-frequency omnidirectional antenna includes a first feeding point, a monopole antenna, a first dielectric substrate, and a second dielectric substrate placed outside the first dielectric substrate, a first solid metal column is connected through the first dielectric substrate and the second dielectric substrate, a third dielectric substrate and a fourth dielectric substrate are fixedly arranged on the top of the first dielectric substrate, a first metal plate is printed between the third dielectric substrate and the fourth dielectric substrate, a first feeding structure is printed on the bottom of the fourth dielectric substrate, and the first feeding point and the monopole antenna are connected to the first feeding structure through the third dielectric substrate and the fourth dielectric substrate respectively. The present invention provides a 5G dual-frequency omnidirectional antenna, which solves the technical problem of poor isolation effect of feeding points between different frequency antennas in the prior art.

Description

Technical Field

[0001] The present invention relates to a 5G dual-frequency omnidirectional antenna, and belongs to the technical field of antennas. Background Art

[0002] With the rapid development of the communications industry, people's demand for bandwidth is increasing. Since the two 5G frequency bands of 2.515GHZ-2.675GHZ and 3.4GHZ-3.6GHZ are being widely used, it is increasingly important to design multi-frequency antennas that can cover these two 5G frequency bands. In order to reduce the overall volume of the antenna, the existing dual-frequency omnidirectional antennas place antenna units of different frequency bands closely together, which leads to stronger coupling of the feeding points between different-frequency antennas, which in turn leads to poor isolation of the feeding points between different-frequency antennas. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a 5G dual-band omnidirectional antenna to solve the technical problem of poor isolation of feeding points between different-frequency antennas in the prior art.

[0004] To achieve the above-mentioned object, the present invention provides a 5G dual-band omnidirectional antenna, which includes a first feeding point, a monopole antenna, a first dielectric substrate, and a second dielectric substrate placed outside the first dielectric substrate, a first solid metal column is connected through the first dielectric substrate and the second dielectric substrate, a third dielectric substrate and a fourth dielectric substrate are fixedly arranged on the top of the first dielectric substrate, a first metal plate is printed between the third dielectric substrate and the fourth dielectric substrate, a first feeding structure is printed on the bottom of the fourth dielectric substrate, the first feeding point and the monopole antenna are respectively connected to the first feeding structure through the third dielectric substrate and the fourth dielectric substrate, and a second dielectric substrate is printed on the bottom end of the inner wall of the first dielectric substrate. A feeding structure, wherein a second feeding point is fixedly connected to the bottom of the first dielectric substrate, an inner core of the second feeding point is connected to the second feeding structure, a second metal plate is printed on the outer wall of the first dielectric substrate, a third metal plate is printed on the inner wall of the second dielectric substrate, a slot antenna is printed on the third metal plate, a first microstrip feeding line is printed on the outer wall of the second dielectric substrate, a hollow metal column is clamped between the first dielectric substrate and the second dielectric substrate, a second solid metal column is arranged in the hollow metal column, one end of the second solid metal column passes through the second dielectric substrate to be connected to the first microstrip feeding line, and the other end of the second solid metal column passes through the first dielectric substrate to be connected to the second feeding structure.

[0005] Furthermore, the third dielectric substrate is located above the fourth dielectric substrate, the bottom of the third dielectric substrate is fixedly connected to the top of the first dielectric substrate, and the outer wall of the fourth dielectric substrate is fixedly connected to the inner wall of the first dielectric substrate.

[0006] Furthermore, a first snap-in position is provided on the third dielectric substrate, a second snap-in position corresponding to the first snap-in position is provided on the fourth dielectric substrate, the outer core of the first feeding point is snap-into the first snap-in position, and the inner core of the first feeding point is snap-into the second snap-in position.

[0007] Furthermore, fourth engaging positions are correspondingly formed on the third dielectric substrate and the fourth dielectric substrate, and the monopole antenna is engaged with the fourth engaging positions.

[0008] Furthermore, the first feeding structure includes a second microstrip feed line and a third microstrip feed line arranged on one side of the second microstrip feed line, the third microstrip feed line has an arc-shaped filter strip extending away from the side of the second microstrip feed line, the inner core of the first feeding point passes through the third dielectric substrate and the fourth dielectric substrate and is connected to the center position of the other side of the second microstrip feed line, and the bottom of the monopole antenna passes through the third dielectric substrate and the fourth dielectric substrate and is connected to one end of the third microstrip feed line away from the second microstrip feed line.

[0009] Furthermore, the second feeding structure includes a fourth microstrip feed line, U-shaped filter strips are arranged at intervals on both sides of the fourth microstrip feed line, the U-shaped mouth of the U-shaped filter strip faces away from the side where the fourth microstrip feed line is located, and the inner core of the second feeding point is connected to the bottom of the fourth microstrip feed line.

[0010] Furthermore, the outer wall of the first dielectric substrate and the inner wall of the second dielectric substrate are provided with slots, and both ends of the hollow metal column are respectively engaged in the slots.

[0011] Furthermore, one end of the second solid metal column passes through the second dielectric substrate and is connected to the bottom of the first microstrip feed line, and the other end of the second solid metal column passes through the first dielectric substrate and is connected to the top of the fourth microstrip feed line.

[0012] Furthermore, the monopole antenna, the first solid metal column, the first feeding structure, the second feeding structure, the second feeding point, the slot antenna, the first microstrip feeding line, the second solid metal column and the hollow metal column are respectively provided in four, located at 0°, 90°, 180° and 270° positions.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] By using the first dielectric substrate, the second dielectric substrate, the third dielectric substrate and the fourth dielectric substrate to closely place the monopole antenna and the slot antenna, not only the volume of the 5G dual-band omnidirectional antenna is effectively reduced, but also the free regulation of different antenna frequency bands can be achieved;

[0015] By printing the first feeding structure at the bottom of the fourth dielectric substrate and printing the second feeding structure at the bottom end of the inner wall of the first dielectric substrate, the monopole antenna and the slot antenna produce a notch effect in the relative frequency band, thereby reducing the feeding point coupling between the monopole antenna and the slot antenna in two different frequency bands, and greatly improving the feeding point isolation effect between the monopole antenna and the slot antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a 5G dual-band omnidirectional antenna provided by an embodiment of the present invention;

[0017] Figure 2 is a side view of a 5G dual-band omnidirectional antenna provided by an embodiment of the present invention;

[0018] Figure 3 is a top view of a 5G dual-band omnidirectional antenna provided by an embodiment of the present invention;

[0019] Figure 4 It is a simulated reflection coefficient and actual gain diagram of a 5G dual-band omnidirectional antenna provided by an embodiment of the present invention when the antenna works at a low frequency;

[0020] Figure 5 It is a simulated reflection coefficient and actual gain diagram of a 5G dual-band omnidirectional antenna provided by an embodiment of the present invention when the high-frequency antenna works;

[0021] Figure 6 It is the isolation between the first feeding point and the second feeding point of a 5G dual-band omnidirectional antenna in different frequency bands provided by an embodiment of the present invention;

[0022] Figure 7 3D gain radiation patterns of a 5G dual-band omnidirectional antenna at 2.59 GHz and 3.5 GHz provided by an embodiment of the present invention, wherein (a) is a 3D radiation pattern of a low-frequency omnidirectional antenna at 2.59 GHz, and (b) is a 3D radiation pattern of a high-frequency omnidirectional antenna at 3.5 GHz;

[0023] Figure 8 1 is an E-plane and H-plane radiation pattern of a 5G dual-frequency omnidirectional antenna at 2.59 GHz and 3.5 GHz provided by an embodiment of the present invention, wherein (a) is an E-plane pattern of a low-frequency omnidirectional antenna at 2.59 GHZ, (b) is an H-plane pattern of a low-frequency omnidirectional antenna at 2.59 GHz, (c) is an E-plane pattern of a high-frequency omnidirectional antenna at 3.5 GHz, and (d) is an H-plane pattern of a high-frequency omnidirectional antenna at 3.5 GHz;

[0024] In the figure: 1, monopole antenna; 2, second dielectric substrate; 3, first solid metal column; 4, first microstrip feed line; 5, second solid metal column; 6, hollow metal column; 7, second feeding point; 8, fourth microstrip feed line; 9, U-shaped filter strip; 10, slot antenna; 11, first dielectric substrate; 12, fourth dielectric substrate; 13, third dielectric substrate; 14, first feeding point; 15, second microstrip feed line; 16, arc-shaped filter strip; 17, third microstrip feed line. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0028] Embodiment 1:

[0029] like Figures 1 to 3 As shown, a 5G dual-band omnidirectional antenna provided in an embodiment of the present invention includes a first feeding point 14, a monopole antenna 1, a first dielectric substrate 11, and a second dielectric substrate 2 placed outside the first dielectric substrate 11;

[0030] A first solid metal column 3 is connected through the first dielectric substrate 11 and the second dielectric substrate 2. A third dielectric substrate 13 and a fourth dielectric substrate 12 are fixedly arranged on the top of the first dielectric substrate 11. In this embodiment, the third dielectric substrate 13 is located above the fourth dielectric substrate 12. The bottom of the third dielectric substrate 13 is fixedly connected to the top of the first dielectric substrate 11. The outer wall of the fourth dielectric substrate 12 is fixedly connected to the inner wall of the first dielectric substrate 11. A first metal plate is printed between the third dielectric substrate 13 and the fourth dielectric substrate 12. A first feeding structure is printed on the bottom of the fourth dielectric substrate 12. The first feeding point 14 and the monopole antenna 1 are connected to the first feeding structure through the third dielectric substrate 13 and the fourth dielectric substrate 12 respectively. Specifically, the first feeding structure includes a second microstrip feed line 15 and a third microstrip feed line 17 arranged on one side of the second microstrip feed line 15. The third microstrip feed line 17 has an arc-shaped filter strip 16 extending away from the second microstrip feed line 15. A first clamping position is provided on the third dielectric substrate 13. The fourth dielectric substrate 12 is provided on the bottom of the fourth dielectric substrate 12. A second snap-in position corresponding to the first snap-in position is provided on the board 12, and a fourth snap-in position is correspondingly provided on the third dielectric substrate 13 and the fourth dielectric substrate 12. When snapping, the outer core of the first feeding point 14 is snapped with the first snap-in position, and the inner core of the first feeding point 14 is snapped with the second snap-in position. At the same time, the inner core of the first feeding point 14 passes through the second snap-in position and is connected to the center position of the other side of the second microstrip feed line 15, the bottom of the monopole antenna 1 is snapped with the fourth snap-in position, and the bottom of the monopole antenna 1 passes through the fourth snap-in position and is connected to an end of the third microstrip feed line 17 away from the second microstrip feed line 15. A second feeding structure is printed on the bottom end of the inner wall of the first dielectric substrate 11, a second feeding point 7 is fixedly connected to the bottom of the first dielectric substrate 11, an inner core of the second feeding point 7 is connected to the second feeding structure, specifically, the second feeding structure includes a fourth microstrip feed line 8, and U-shaped filter strips 9 are arranged at intervals on both sides of the fourth microstrip feed line 8. It should be noted that the U-shaped mouth of the U-shaped filter strip 9 faces away from the side where the fourth microstrip feed line 8 is located, the outer core of the second feeding point 7 is fixedly connected to the bottom of the first dielectric substrate 11, and the inner core of the second feeding point 7 is connected to the bottom of the fourth microstrip feed line 8.A second metal plate is printed on the outer wall of the first dielectric substrate 11, a third metal plate is printed on the inner wall of the second dielectric substrate 2, a slot antenna 10 is printed on the third metal plate, a first microstrip feed line 4 is printed on the outer wall of the second dielectric substrate 2, a hollow metal column 6 is clamped between the first dielectric substrate 11 and the second dielectric substrate 2, a second solid metal column 5 is arranged in the hollow metal column 6, one end of the second solid metal column 5 passes through the second dielectric substrate 2 to be connected to the first microstrip feed line 4, and the other end of the second solid metal column 5 passes through the first dielectric substrate 11 to be connected to the second feeding structure. Specifically, one end of the second solid metal column 5 passes through the second dielectric substrate 2 to be connected to the bottom of the first microstrip feed line 4, and the other end of the second solid metal column 5 passes through the first dielectric substrate 11 to be connected to the top of the fourth microstrip feed line 8. The present invention closely places the monopole antenna 1 and the slot antenna 10 by adopting the layout mode of the first dielectric substrate 11, the second dielectric substrate 2, the third dielectric substrate 13 and the fourth dielectric substrate 12, which not only effectively reduces the volume of the 5G dual-band omnidirectional antenna, but also can realize the free regulation of different antenna frequency bands. At the same time, by printing the first feeding structure at the bottom of the fourth dielectric substrate 12 and printing the second feeding structure at the bottom end of the inner wall of the first dielectric substrate 11, the monopole antenna 1 and the slot antenna 10 produce a notch effect in the relative frequency band, thereby reducing the feeding point coupling between the monopole antenna 1 and the slot antenna 10 in two different frequency bands, and greatly improving the feeding point isolation effect between the monopole antenna 1 and the slot antenna 10.

[0031] In one embodiment, a first through hole matching one end of a first solid metal column 3 is formed on a first dielectric substrate 11, and a second through hole matching the other end of the first solid metal column 3 is formed on a second dielectric substrate 2. During installation, one end of the first solid metal column 3 is clamped with the first through hole, and the other end of the first solid metal column 3 is clamped with the second through hole. By setting the first solid metal column 3, not only can the fixed positions of the first dielectric substrate 11 and the second dielectric substrate 2 be effectively fixed to ensure an equidistant gap between the first dielectric substrate 11 and the second dielectric substrate 2, but also the radiation direction of the 5G dual-band omnidirectional antenna can be adjusted by connecting the slot antenna 10 to the second metal plate.

[0032] In one embodiment, the outer wall of the first dielectric substrate 11 and the inner wall of the second dielectric substrate 2 are provided with slots, and both ends of the hollow metal column 6 are respectively engaged in the slots. It should be noted that the hollow metal column 6 is arranged below the first solid metal column 3 .

[0033] In this embodiment, the first dielectric substrate 11, the second dielectric substrate 2, the third dielectric substrate 13 and the fourth dielectric substrate 12 are all made of a material with a dielectric constant of 3.5 and a loss tangent of 0.005 by 3D printing technology, and the thickness of the first dielectric substrate 11, the second dielectric substrate 2, the third dielectric substrate 13 and the fourth dielectric substrate 12 is 1 mm.

[0034] In this embodiment, the monopole antenna 1, the first feeding point 14, the first solid metal column 3, the first feeding structure, the second feeding structure, the second feeding point 7, the slot antenna 10, the first microstrip feeding line 4, the second solid metal column 5 and the hollow metal column 6 are respectively provided with four, among which, except the first feeding point 14, the rest are arranged at the 0°, 90°, 180° and 270° positions of the 5G dual-band omnidirectional antenna.

[0035] It should be noted that the monopole antenna 1, the first feeding point 14, the third dielectric substrate 13, the fourth dielectric substrate 12, the first metal plate and the first feeding structure in the present invention constitute a low-frequency omnidirectional antenna, wherein the monopole antenna 1 is used as a radiator, the first metal plate is used as a reflector, and the arc-shaped filter strip 16 extending from one side of the third microstrip feed line 17 is used to filter out high-frequency signals, thereby improving the isolation effect of the feeding point. Except for the structural part that constitutes the low-frequency omnidirectional antenna, the remaining structural parts constitute a high-frequency omnidirectional antenna, wherein the slot antenna 10 is used as a radiator, the second metal plate is used as a reflector, and the U-shaped filter strips 9 located on both sides of the fourth microstrip feed line 8 are used to filter out low-frequency signals, thereby improving the isolation effect of the feeding point.

[0036] Embodiment 2:

[0037] like Figure 4 As shown, from Figure 4 It can be concluded that the 5G dual-band omnidirectional antenna has good impedance matching (|S11|≤-10 dB) in the 5G frequency band of 2.515 GHz~2.675 GHz, and has a stable radiation gain in this frequency band (actual gain ≥2dBi).

[0038] like Figure 5 As shown, from Figure 5 It can be concluded that the 5G dual-band omnidirectional antenna has good impedance matching (|S11|≤-10 dB) in the 3.4 GHz~3.5 GHz band of the 5G frequency band, and has a stable radiation gain in this frequency band (actual gain ≥2 dBi).

[0039] like Figure 6 As shown, from Figure 6It can be concluded that the isolation between the first feeding point 14 and the second feeding point 7 of the 5G dual-band omnidirectional antenna in the 5G frequency band of 2.515 GHz~2.675 GHz is ≥23 dB, and the isolation between the first feeding point 14 and the second feeding point 7 in the 5G frequency band of 3.4 GHz~3.6 GHz is ≥28 dB.

[0040] like Figure 7 As shown, from Figure 7 From (a), it can be concluded that the 5G dual-band omnidirectional antenna can perform horizontal omnidirectional radiation with high gain in the 2.59 GHz frequency band. Figure 7 (b) It can be concluded that the 5G dual-band omnidirectional antenna can perform horizontal omnidirectional radiation with high gain in the 3.5GHz frequency band.

[0041] like Figure 8 As shown, from Figure 8 From (a), (b), (c), and (d), it can be concluded that the 5G dual-band omnidirectional antenna can perform stable horizontal omnidirectional radiation in both the 2.515 GHz~2.675 GHz and 3.4 GHz~3.6 GHz frequency bands, with good radiation performance, low horizontal plane gain fluctuation, and non-circularity less than 0.5 dB.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A 5G dual-band omnidirectional antenna, characterized in that: The invention comprises a first feeding point, a monopole antenna, a first dielectric substrate and a second dielectric substrate placed outside the first dielectric substrate, a first solid metal column is connected between the first dielectric substrate and the second dielectric substrate, a third dielectric substrate and a fourth dielectric substrate are fixedly arranged on the top of the first dielectric substrate, the third dielectric substrate is located above the fourth dielectric substrate, a first metal plate is printed between the third dielectric substrate and the fourth dielectric substrate, a first feeding structure is printed on the bottom of the fourth dielectric substrate, the first feeding point and the monopole antenna are connected to the first feeding structure through the third dielectric substrate and the fourth dielectric substrate respectively, and a second dielectric plate is printed on the bottom end of the inner wall of the first dielectric substrate. A feeding structure, wherein a second feeding point is fixedly connected to the bottom of the first dielectric substrate, an inner core of the second feeding point is connected to the second feeding structure, a second metal plate is printed on the outer wall of the first dielectric substrate, a third metal plate is printed on the inner wall of the second dielectric substrate, a slot antenna is printed on the third metal plate, a first microstrip feeding line is printed on the outer wall of the second dielectric substrate, a hollow metal column is clamped between the first dielectric substrate and the second dielectric substrate, a second solid metal column is arranged in the hollow metal column, one end of the second solid metal column passes through the second dielectric substrate to be connected to the first microstrip feeding line, and the other end of the second solid metal column passes through the first dielectric substrate to be connected to the second feeding structure; Among them, the first feeding structure includes a second microstrip feed line and a third microstrip feed line arranged on one side of the second microstrip feed line, and the third microstrip feed line has an arc-shaped filter strip extending away from the side of the second microstrip feed line; the second feeding structure includes a fourth microstrip feed line, and U-shaped filter strips are arranged at intervals on both sides of the fourth microstrip feed line, and the U-shaped mouth of the U-shaped filter strip faces away from the side where the fourth microstrip feed line is located.

2. The 5G dual-band omnidirectional antenna according to claim 1, characterized in that: The bottom of the third dielectric substrate is fixedly connected to the top of the first dielectric substrate, and the outer wall of the fourth dielectric substrate is fixedly connected to the inner wall of the first dielectric substrate.

3. The 5G dual-band omnidirectional antenna according to claim 1, characterized in that: The third dielectric substrate is provided with a first clamping position, the fourth dielectric substrate is provided with a second clamping position corresponding to the first clamping position, the outer core of the first feeding point is clamped with the first clamping position, and the inner core of the first feeding point is clamped with the second clamping position.

4. The 5G dual-band omnidirectional antenna according to claim 1, characterized in that: The third dielectric substrate and the fourth dielectric substrate are also provided with fourth engaging positions correspondingly, and the monopole antenna is engaged with the fourth engaging positions.

5. The 5G dual-band omnidirectional antenna according to claim 3, characterized in that: The inner core of the first feeding point passes through the third dielectric substrate and the fourth dielectric substrate to be connected to the center position of the other side of the second microstrip feed line, and the bottom of the monopole antenna passes through the third dielectric substrate and the fourth dielectric substrate to be connected to an end of the third microstrip feed line away from the second microstrip feed line.

6. The 5G dual-band omnidirectional antenna according to claim 1, characterized in that: The inner core of the second feeding point is connected to the bottom of the fourth microstrip feeding line.

7. The 5G dual-band omnidirectional antenna according to claim 1, characterized in that: The outer wall of the first dielectric substrate and the inner wall of the second dielectric substrate are provided with card slots, and both ends of the hollow metal column are respectively carded in the card slots.

8. The 5G dual-band omnidirectional antenna according to claim 6, characterized in that: One end of the second solid metal column passes through the second dielectric substrate and is connected to the bottom of the first microstrip feed line, and the other end of the second solid metal column passes through the first dielectric substrate and is connected to the top of the fourth microstrip feed line.

9. The 5G dual-band omnidirectional antenna according to claim 1, characterized in that: The monopole antenna, the first solid metal column, the first feeding structure, the second feeding structure, the second feeding point, the slot antenna, the first microstrip feeding line, the second solid metal column and the hollow metal column are respectively provided in four, located at 0°, 90°, 180° and 270°.

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