Ultra-wideband low-profile vertically polarized omnidirectional antenna

Abstract

The present application provides an ultra-wideband low-profile vertically polarized omnidirectional antenna, comprising a metal floor, a radiation arm, and a metal disc. The radiation arm comprises corrugated radiation arms and long straight radiation arms which are alternately arranged in a radial shape; the top of the radiation arm is fixedly connected to the metal disc; the outer ends of the corrugated radiation arms are connected to the metal floor; and the parts inside the outer ends of the corrugated radiation arms are suspended above the metal floor. According to the antenna of the present invention, the corrugated radiation arms are combined with the metal disc at the top, thereby reducing the profile height of the antenna; the long straight radiation arms can generate resonance points at high-frequency points, and the resonance points are combined with resonance points generated by the corrugated radiation arms, thereby expanding the bandwidth of the antenna; six arc-shaped grooves are etched in the metal floor, so that the radiation performance at the high-frequency points can be improved, thereby ensuring the stability of the pattern of the antenna in the whole working frequency band; and the outermost end of the metal floor is bent upwards and inwards, thereby reducing the plane size of the antenna while achieving a low profile and not affecting the performance of the antenna.

Description

[0001] The present application claims priority to Chinese patent application No. 202310982592.0 filed with the China National Intellectual Property Administration on August 7, 2023 titled "an ultra-wideband low-profile vertically polarized omnidirectional antenna applied in indoor distributed system", the entire contents of which are incorporated herein by reference.Technical Field

[0002] The present application relates to the technical field of antenna, in particular to an ultra-wideband low-profile vertically polarized omnidirectional antenna.Background Art

[0003] In current mobile communication, the demand for indoor base stations is constantly increasing, and indoor communication has become one of the main communication scenarios in daily life. Among them, omnidirectional antennas that can achieve a full coverage of signals in 360° range are the first choice for indoor base stations. With the large-scale commercial use of 5G, the application of 5G antennas has become widespread. Meanwhile, the 2G / 3G / LTE frequency bands still play an important role in the evolution of communication technology. Therefore, developing antennas that cover both 2G / 3G / LTE / 5G frequency bands has great application prospects. The 1.7-2.7GHz frequency band is of critical importance for 4G LTE (long-term evolution) networks and has attracted much attention in the design of base station antennas. In addition, N78 (3.3-3.8GHz) and N79 (4.8-5GHz) are the main frequency bands for 5G communication deployment and testing. Due to the installation of indoor distributed omnidirectional antennas on indoor ceilings, a lower profile is beneficial for saving space and also more beautiful. Therefore, there is an urgent need for indoor distributed antennas with low profiles that can simultaneously cover the three frequency bands mentioned above.

[0004] Traditional indoor distributed omnidirectional antennas are mainly divided into single polarized omnidirectional antennas and dual polarized omnidirectional antennas. Usually, single polarized omnidirectional antennas are mainly vertically polarized, because vertically polarized waves are more likely to propagate on undulating terrain in land mobile communication, thereby greatly reducing energy attenuation. At present, vertically polarized antennas are mostly implemented by monopole antennas or conical antennas, which have large profile dimensions and high production and manufacturing costs. In addition, for ultra-wideband omnidirectional antennas, radiation pattern degradation at high frequency points is a common problem.

[0005] After search, it is found that Chinese invention patent No. CN109687132A discloses a low-profile vertically polarized ultra-wideband omnidirectional antenna, which includes several triangular metal plates, short-circuit metal pillars, circular metal plates, rectangular grounding plates, and coaxial feeding portions. The profile height of this vertically polarized omnidirectional antenna is 0.128λ low (λ low is the wavelength in free space at the lowest operating frequency of the antenna). At high frequency points, the radiation pattern in horizontal plane shows severe deterioration with a non-circularity greater than 5dB.Summary of the Invention

[0006] In view of this, the present application provides an ultra-wideband low-profile vertically polarized omnidirectional antenna, which effectively solves the problem of large profile dimensions and degraded radiation pattern at high frequency points of existing ultra-wideband vertically polarized omnidirectional antennas.

[0007] In a first aspect, the present application discloses an ultra-wideband low-profile vertically polarized omnidirectional antenna comprising a metal disk, a radiating arm, and a metal grounding plate; an SMA adaptor is inserted upward from a central hole of the metal grounding plate, an inner conductor of the SMA adaptor is connected to an inner end of the radiating arm, an outer conductor of the SMA adaptor is connected to the metal grounding plate; the metal disk is supported overhead the metal grounding plate by the radiating arm, the radiating arm includes long straight radiating arms and corrugated radiating arms, and the long straight radiating arms and the corrugated radiating arms are arranged alternately in a radiating pattern; the outer end of the long straight radiating arm is fixedly connected to the metal disk; the top of the corrugated radiating arm is fixedly connected to the metal disk, the bottom of the outer end of the corrugated radiating arm is connected to the metal grounding plate, and the portion within the outer end of the corrugated radiating arm is suspended above the metal grounding plate.

[0008] In some possible implementations, the metal disk and the metal grounding plate have circular shape, with their centers being located on the same vertical line.

[0009] In some possible implementations, the corrugated radiating arm is formed by bending a rectangular metal sheet a plurality of times, and the corrugated radiating arm is coupled with the metal disk to reduce the profile height of the antenna; the resonant point, at which the high-frequency point is generated by the long straight radiating arm, is combined with the resonant point generated by the corrugated radiating arm to expand the bandwidth of the antenna.

[0010] In some possible implementations, the metal grounding plate is provided with arc-shaped grooves located on the outer side of the radiating arm in a one-to-one correspondence. The center of the arc-shaped groove and the center of the metal grounding plate are located on the same vertical line to improve the radiation performance at high frequency points and ensure the stability of the antenna's radiation pattern throughout the entire operating frequency band.

[0011] In some possible implementations, the outer end of the metal grounding plate is bent upward and inward, to reduce the planar size of the antenna while achieving low profile and not affecting antenna performance.

[0012] In some possible implementations, there are three long straight radiating arms and three corrugated radiating arms, and the angle between the long straight radiating arm and the corrugated radiating arm adjacent to each other is 60°.

[0013] In some possible implementations, a feed port is provided at the central hole of the metal grounding plate, and the SMA adaptor is fixed through the feed port.

[0014] In some possible implementations, the bending times and the bending angle of the corrugated radiating arm is adjusted according to the impedance matching of the antenna.

[0015] In some possible implementations, the metal disk, the radiating arm, and metal grounding plate are made of copper material and form an integral structure through 3D printing technology.

[0016] In a second aspect, the present application provides an antenna comprising any one of above-mentioned ultra-wideband low-profile vertically polarized omnidirectional antennas.

[0017] According to the above technical solutions, the combination of the corrugated radiating arm and the metal disk at the top reduces the antenna height to meet the application requirements of low profile, with the profile height being only 5.4% of the vacuum wavelength at the lowest operating frequency; the long straight radiating arm can generate resonance points at high frequency points, which may be combined with the resonance points generated by the corrugated radiating arm, thereby expanding the bandwidth of the antenna; in addition, the radiating arm also serves as a support component for the metal disk at the top. There are six arc-shaped grooves etched on the metal grounding plate, which can be used to improve the problem of radiating performance deterioration of ultra-wideband antennas at high frequency point, thereby ensuring the stability of the antenna's radiation pattern throughout the entire operating frequency band; the outermost end of the metal grounding plate is bent upwards and inwards, which can reduce the planar size of the antenna while achieving a low profile without affecting the performance of the antenna.Description of Drawings

[0018] Fig. 1 is a perspective view of the structure of an ultra-wideband low-profile vertically polarized omnidirectional antenna according to the present invention; Fig. 2 is a front view of the ultra-wideband low-profile vertically polarized omnidirectional antenna according to the present invention; Fig. 3 is a top view of a metal grounding plate of the ultra-wideband low-profile vertically polarized omnidirectional antenna according to the present invention; Fig. 4 is a plot of reflection coefficient and gain of the ultra-wideband low-profile vertically polarized omnidirectional antenna according to the present invention; Fig. 5 is a radiation pattern of the ultra-wideband low-profile vertically polarized omnidirectional antenna according to the present invention at a frequency point of 2.2 GHz; Fig. 6 is a radiation pattern of the ultra-wideband low-profile vertically polarized omnidirectional antenna according to the present invention at a frequency point of 3.5 GHz; Fig. 7 is a radiation pattern of the ultra-wideband low-profile vertically polarized omnidirectional antenna according to the present invention at a frequency point of 4.8 GHz.

[0019] In the figures: 1 - metal disk; 2 - radiating arm; 3 - metal grounding plate; 21 - corrugated metal arm; 22 - long straight metal arm; 31 - arc-shaped groove; 32 - central hole.Embodiments

[0020] In order to better understand the above objects, features, and advantages of the present application, a detailed description of the present application will be provided below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments and features in embodiments of the present application can be combined with each other.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present application. The described embodiments are only some embodiments of the present application, not all embodiments.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art belonging to the present application. The terms used in the description of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0023] It should be further noted that, the terms "comprising", "including", or any other variants thereof used herein are intended to encompass non-exclusive including, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or includes elements inherent to such process, method, article, or device. Without further limitations, the element defined by the sentence "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or device comprising this element.

[0024] In the present application, "at least one" refers to one or more, and "a plurality of" refers to two or more than two. "And / or" describes the relationship between related objects and indicates there may be three relationships, for example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural.

[0025] As shown in Figs. 1 to 3, a structural perspective view of an ultra-wideband low-profile vertically polarized omnidirectional antenna according to the present invention is shown, the ultra-wideband low-profile vertically polarized omnidirectional antenna comprises a metal disk 1, a radiating arm 2, and a metal grounding plate 3, an SMA adaptor is inserted upward from the central hole 32 of the metal grounding plate 3, the inner conductor of the SMA adaptor is connected to an inner end of the radiating arm 2, and the outer conductor of the SMA adaptor is connected to the metal grounding plate 3, and the metal disk 1 is supported overhead the metal grounding plate 3 by the radiating arm 2. The metal disk 1 and the metal grounding plate 3 have a circular shape, with their centers being located on the same vertical line. A feed port is provided at the central hole 32 of the metal grounding plate 3, and the SMA adaptor is fixed through the feed port. The metal disk 1, the radiating arm 2, and the metal grounding plate 3 are made of copper material and formed into an integral structure through 3D printing technology.

[0026] In this example, the radiating arm 2 includes three long straight radiating arms 22 and three corrugated radiating arms 21, wherein the long straight radiating arms 22 and the corrugated radiating arms 21 are alternately arranged in a radiation pattern and the angle between the long straight radiating arm 22 and the corrugated radiating arm 21 adjacent to each other is 60°. The outer end of the long straight radiating arm 22 is upturned to be fixedly connected to the metal disk 1, and the inner end of the long straight radiating arm 22 is connected to the inner conductor of the SMA adaptor. The long straight radiating arm 22 is used to generate resonance points at high frequency points to expand the bandwidth of the antenna. The corrugated radiating arm 21 is formed by bending a rectangular metal sheet for several times, and the bending times and the bending angle may be adjusted according to the antenna's performance such as the impedance matching of the antenna. The top of the corrugated radiating arm 21 is fixedly connected to the metal disk 1, the bottom of the outer end of the corrugated radiating arm 21 is connected to the metal grounding plate 3, the inner end of the corrugated radiating arm 21 is connected to the inner conductor of the SMA adaptor, and the portion within the outer end of the corrugated radiating arm 21 is suspended above the metal grounding plate 3, that is, a gap is formed between the bottom of the portion within the outer end of the corrugated radiating arm 21 and the metal grounding plate 3.

[0027] As shown in Fig. 1, the metal grounding plate 3 is provided with six arc-shaped grooves 31, the arc-shaped grooves 31 are located in the outer side of the radiating arm 2 in a one-to-one correspondence, and the center of the arc-shaped groove 31 and the center of the metal grounding plate 3 are on the same vertical line. These six arc-shaped grooves 31 can improve the problem of radiating performance deterioration of ultra-wideband antennas at high frequency points, thereby ensuring the stability of the antenna's radiation pattern throughout the entire operating frequency band. The outer end of the metal grounding plate 3 is bent upward and inward to reduce the planar size of the antenna to 0.82 λ low (λ low is the wavelength in the free space at the lowest operating frequency of the antenna).

[0028] The metal disk 1 extends the current path in the radiating arm 2, and the combination of the three corrugated radiating arms 21 and the metal disk 1 is beneficial for reducing the profile height of the antenna; the three long straight radiating arms 22 are used to generate resonance points at high frequency points to expand the antenna's bandwidth. The profile dimension of the antenna is only 0.054 λ low , which compensates for the defects of large profile dimensions commonly present in the existing same kind of antennas to a great extent.

[0029] In the examples of the present invention, the dimensions of each part of the antenna are optimized, and the specific parameters of the antenna are shown in the table below: Parametersr 1 r 2 r 3 r 4 tl 1 l 2 Value32.30mm73.21mm9.96mm35.06mm0.8mm27.79mm28.92mmParametersw 1 w 2 w 3 h 1 h 2 h 3 αValue1.43mm2.10mm5.02mm4.93mm3.954mm1.90mm37.43°

[0030] In the table, r 1 is the radius of metal disk 1, r 2 is the radius of metal grounding plate 3, r 3 is the width of the inward bending portion of the metal grounding plate 3, r 4 is the distance between the arc-shaped groove 31 and the center, t is the thickness of the metal disk 1 and the metal grounding plate 3, l 1 is the projected length of corrugated radiating arm 21, l 2 is the projected length of the long straight radiating arm 22, w 1 is the width of the corrugated radiating arm 21, w 2 is the width of the long straight radiating arm 22, w 3 is the width of the arc-shaped groove 31, h 1 is the distance between metal disk 1 and the metal grounding plate 3, h 2 is the height of the upward bending portion of the metal grounding plate 3, and h 3 is the distance between the bottom of the inner end of the corrugated radiating arm 21 and the metal grounding plate 3, α is the angle of the arc-shaped groove 31. In addition, the thickness of the corrugated radiating arm 21 is 1.91mm, and the thickness of the long straight radiating arm 22 is 1.78mm.

[0031] Fig. 4 shows a plot of reflection coefficient and gain of the ultra-wideband low-profile vertically polarized omnidirectional antenna according to the present invention, and the results show that the relative bandwidth of the design is 105.22% (1.68-5.41GHz), and the gain within the operating frequency band is between 3.8dBi and 8dBi.

[0032] Figs. 5, 6, and 7 show the radiation patterns of the antenna at three different frequency points. The results show that the radiation patterns within the operating frequency band of this design have good consistency, especially at high frequency points, where the radiation pattern also has good omnidirectional performance. The omnidirectional radiation performance is good throughout the entire operating frequency band.

[0033] In addition, the present invention also claims to protect an antenna comprising the ultra-wideband low-profile vertically polarized omnidirectional antenna in this example.

[0034] Only specific embodiments of the present application are described above, but the protection scope of the present application is not limited to this. Any variations or replacements readily envisaged by any skilled person familiar with the technical field within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An ultra-wideband low-profile vertically polarized omnidirectional antenna comprising a metal disk (1), a radiating arm (2), and a metal grounding plate (3), an SMA adaptor being inserted upward from a central hole (32) of the metal grounding plate (3), an inner conductor of the SMA adaptor being connected to an inner end of the radiating arm (2), an outer conductor of the SMA adaptor being connected to the metal grounding plate (3), and the metal disk (1) being supported overhead the metal grounding plate (3) by the radiating arm (2), characterized in that: the radiating arm (2) includes long straight radiating arms (22) and corrugated radiating arms (21), and the long straight radiating arms (22) and the corrugated radiating arms (21) are arranged alternately in a radiating pattern; the outer end of the long straight radiating arm (22) being fixedly connected to the metal disk (1); the top of the corrugated radiating arm (21) being fixedly connected to the metal disk (1), the bottom of the outer end of the corrugated radiating arm (21) being connected to the metal grounding plate (3), and the portion within the outer end of the corrugated radiating arm (21) is suspended above the metal grounding plate (3).

2. The ultra-wideband low-profile vertically polarized omnidirectional antenna according to claim 1, characterized in that the metal disk (1) and the metal grounding plate (3) have a circular shape, with their centers being located on the same vertical line.

3. The ultra-wideband low-profile vertically polarized omnidirectional antenna according to claim 1, characterized in that the corrugated radiating arm (21) is formed by bending a rectangular metal sheet a plurality of times, the corrugated radiating arm (21) being coupled with the metal disk (1) to reduce the profile height of the antenna; the resonant point generated by the long straight radiating arm (22) at high frequency point is combined with the resonant point generated by the corrugated radiating arm to expand the bandwidth of the antenna.

4. The ultra-wideband low-profile vertically polarized omnidirectional antenna according to claim 1, characterized in that the metal grounding plate (3) is provided with arc-shaped grooves (31) located on the outer side of the radiating arm (2) in a one-to-one correspondence, the center of the arc-shaped groove (31) and the center of the metal grounding plate (3) are located on the same vertical line to improve the radiation performance at high frequency points and ensure the stability of the antenna's radiation pattern throughout the entire operating frequency band.

5. The ultra-wideband low-profile vertically polarized omnidirectional antenna according to claim 1, characterized in that the outer end of the metal grounding plate (3) is bent upward and inward to reduce the planar size of the antenna while achieving low profile and not affecting antenna performance.

6. The ultra-wideband low-profile vertically polarized omnidirectional antenna according to claim 5, characterized in that there are three long straight radiating arms (22) and three corrugated radiating arms (21), and the angle between the long straight radiating arm (22) and the corrugated radiating arm (21) adjacent to each other is 60°.

7. The ultra-wideband low-profile vertically polarized omnidirectional antenna according to claim 1, characterized in that a feed port is provided at the central hole (32) of the metal grounding plate (3), and the SMA adaptor is fixed through the feed port.

8. The ultra-wideband low-profile vertically polarized omnidirectional antenna according to claim 1, characterized in that the bending times and the bending angle of the corrugated radiating arm (21) is adjusted according to the impedance matching of the antenna.

9. The ultra-wideband low-profile vertically polarized omnidirectional antenna according to claim 1, characterized in that the metal disk (1), the radiating arm (2), and the metal grounding plate (3) are made of copper material and formed into an integral structure through 3D printing technology.

10. An antenna, characterized in that, the antenna comprises the ultra-wideband low-profile vertically polarized omnidirectional antenna of any one of claims 1-9.

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