CN116154469B - Ultra-surface broadband omnidirectional antenna with low out-of-roundness - Google Patents
Ultra-surface broadband omnidirectional antenna with low out-of-roundness Download PDFInfo
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- H—ELECTRICITY
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- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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Abstract
The invention belongs to the technical field of antennas, relates to a super-surface antenna, and particularly provides a super-surface broadband omni-directional antenna with low out-of-roundness, which is used for solving the problem of larger out-of-roundness of the existing super-surface broadband omni-directional antenna. The invention adopts a regular hexagon patch splicing mode with smaller rotation angle, optimizes the problem of poor rotation symmetry existing in the traditional square patch splicing mode, and ensures that the antenna has lower out-of-roundness in the horizontal direction; the combination of the super surface and the monopole solves the problem of narrow bandwidth and high section of the omnidirectional monopole antenna, and widens the bandwidth of the antenna; the maximum upwarping radiation direction is adjusted to the horizontal direction by introducing an arc gap in the floor; finally, the omnidirectional antenna has the advantages of wide bandwidth, low section, low out-of-roundness and horizontal maximum radiation direction, and can meet the broadband omnidirectional coverage requirement of a wireless communication system.
Description
Technical Field
The invention belongs to the technical field of antennas, relates to a super-surface antenna, and particularly provides a low-out-of-roundness super-surface broadband omnidirectional antenna.
Background
Wireless communication systems have a great demand for broadband omni-directional coverage, which requires that the antennas in the system be broadband omni-directional antennas in order to achieve broadband omni-directional coverage. The most typical omni-directional antenna is a monopole antenna, however, the monopole antenna has the problems of narrow bandwidth, high profile and the like. To solve this problem, patent document CN111740213a discloses a wideband omnidirectional antenna based on a super surface, which has a characteristic of wideband low profile; however, since the square patch is adopted as a unit of the super surface, the square patch has a rotationally symmetrical shape with a rotation angle of 90 degrees, and the rotation angle in the horizontal direction is excessively large, so that the out-of-roundness of the antenna horizontal plane pattern is large.
Disclosure of Invention
The invention aims to solve the problem of larger out-of-roundness of the existing ultra-surface broadband omni-directional antenna, and provides a low out-of-roundness ultra-surface broadband omni-directional antenna which has the advantages of wide bandwidth, low section, horizontal maximum radiation direction and low out-of-roundness.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a low out-of-roundness ultra surface wideband omni-directional antenna, comprising: a grounding metal plate 5, a lower dielectric substrate 4, an intermediate metal plate 3, an upper dielectric substrate 2, a super-surface structure 1 and a feeding metal column 6 which are sequentially stacked from bottom to top; wherein, the liquid crystal display device comprises a liquid crystal display device,
the lower medium substrate 4 and the upper medium substrate 2 are of round structures with the same size;
the super-surface structure is composed of a central regular hexagonal patch 101, six peripheral regular hexagonal patches 102 and six corner-cut regular hexagonal patches 103; the central regular hexagonal patch 101 is located at a central position, and six peripheral regular hexagonal patches 102 are arranged around the central regular hexagonal patch 101 and together form a honeycomb structure; a corner-cut regular hexagon patch 103 is arranged between adjacent peripheral regular hexagon patches 102 respectively, and the outer edge of the corner-cut regular hexagon patch 103 coincides with an circumscribed circle of the honeycomb structure; the center position of the center regular hexagon patch 101 is provided with an upper regular hexagon window, and the edges of the upper regular hexagon window and the center regular hexagon patch are parallel to each other; rectangular patch gaps are formed in the peripheral regular hexagonal patches 102, and the rectangular patch gaps point to the center of the central regular hexagonal patch from the middle position of the outer edge of the peripheral regular hexagonal patch;
the middle metal plate 3 is provided with a circular feed gap 301, six rectangular coupling gaps 302, six inner circular arc gaps 303 and six outer circular arc gaps 304; the circular feed slot 301 is located at the center position, six rectangular coupling slots 302 are arranged around the circular feed slot 301, and the rectangular coupling slots 302 are located right below the peripheral regular hexagonal patch 102 and perpendicular to the rectangular patch slots; the inner arc gap 303 and the outer arc gap 304 are sequentially arranged at the outer side of the rectangular coupling gap 302, the centers of the inner arc gap 303 and the outer arc gap 304 are positioned on the same radial line of the upper medium substrate 2, and the circle centers of the inner arc gap 303 and the outer arc gap 304 are coincident with the center of the upper medium substrate 2;
the grounding metal plate 5 is in a circular structure, a lower layer circular window 501 is formed in the center of the grounding metal plate, and the edge of the grounding metal plate is connected with the middle metal plate 3 through a plurality of metal short-circuit posts 502; the metal shorting posts 502 penetrate through the lower dielectric substrate 4 and are arranged at equal intervals;
the feeding metal column 6 is located at the center of the antenna, the lower end of the feeding metal column is connected with the inner conductor of the coaxial feeding connector, and the feeding metal column passes through the lower round window 501, the lower dielectric substrate 4, the round feeding slit 301, the upper dielectric substrate 2 and the upper regular hexagonal window to extend vertically to the upper surface of the upper dielectric substrate 2.
Further, the radii of the lower dielectric substrate 4, the upper dielectric substrate 2 and the intermediate metal plate 3 are allr 1 The radius of the circular feed slot 301 isr 2 The radius of the inner arc slit 303 isr 3 The radius of the outer arc slit 304 isr 4 The radius of the grounding metal plate 5 isr 5 The radius of the lower round window 501 isr 6 The radius of the feeding metal post 6 isr 7 And satisfies the relationship:
r 1 >r 4 >r 3 >r 5 ，r 6 >r 2 ，λ/10>(r 2 -r 7 )>λ/15，
wherein, the liquid crystal display device comprises a liquid crystal display device,λthe free space wavelength corresponding to the lowest operating frequency.
Further, the central regular hexagonal patch 101, the peripheral regular hexagonal patch 102 and the corner cut regular hexagonal patch 103 have side lengths ofw 1 The spacing between adjacent patches isgThe method comprises the steps of carrying out a first treatment on the surface of the The length of the rectangular patch gap isl s1 ，1.25w 1 ≤l s1 ≤1.35w 1 。
Further, the inner arc slit 303 has a degree ofθ 1 The outer circular arc gap 304 has a degree ofθ 2 ，θ 1 And (3) withθ 2 The following respectively satisfy:
wherein, the liquid crystal display device comprises a liquid crystal display device,λ H for the wavelength in the medium corresponding to the highest operating frequency,λ L for the wavelength in the medium corresponding to the lowest operating frequency,r 3 is the radius of the inner circular arc gap,r 4 is the radius of the outer arc gap.
Further, the length of the feeding metal column 6 extending vertically to the upper surface of the upper dielectric substrate 2 isl，l<λ/4，λThe free space wavelength corresponding to the lowest working frequency; the feeding metal column vertically extends to the upper surface of the upper dielectric substrate to form a monopole antenna, and the resonance frequency of the monopole antenna is lower than that of the super-surface structure.
Further, the middle metal plate 3, the lower dielectric substrate 4 and the grounding metal plate 5 together form a substrate integrated waveguide structure through the metal shorting post 502, and the resonant frequency of the substrate integrated waveguide structure is lower than that of the super-surface structure.
In terms of working principle:
for an omni-directional antenna, the out-of-roundness of its horizontal plane pattern is mainly due to structural asymmetry; in order to achieve low out-of-roundness, it is desirable that the antenna structure be rotationally symmetrical and that the smaller the rotation angle, the lower the out-of-roundness. Theoretically, a circular structure has perfect rotational symmetry; however, circular microstrip antennas tend to have very narrow bandwidths and low design freedom due to their own mode characteristics; in order to solve the problems of narrow bandwidth and low design freedom of the microstrip antenna, the super-surface antenna is widely studied. Based on the above, the invention designs the super-surface antenna formed by the regular hexagon units with reference to the honeycomb structure, the super-surface rotation angle formed by the regular hexagon patches is 60 degrees, which is lower than the 90-degree rotation angle of the super-surface formed by the traditional square patches, and the super-surface antenna has better rotation symmetry and can optimize the out-of-roundness of the horizontal plane directional diagram; meanwhile, the regular hexagon patch can realize plane full-coverage, so that energy coupling among units is guaranteed, and the bandwidth and caliber efficiency of the antenna are widened.
For the super-surface structure, as the strongest current of the omni-directional mode is distributed on the six peripheral regular hexagon patches 102, the feeding position is also arranged at the peripheral regular hexagon patches, and the super-surface is excited by the 6 rectangular coupling slits 302 rotating around the center, so that the excitation is ensured to have the rotational symmetry of a 60-degree rotation angle. In order to couple energy to six rectangular coupling slots from a port, a one-to-six power divider is needed, and the conventional microstrip power divider has a complex structure and high loss, so that the invention adopts a substrate integrated waveguide slotting mode to realize constant-amplitude in-phase feeding to the six rectangular coupling slots; the middle metal plate 3, the lower dielectric substrate 4 and the grounding metal plate 5 together form a substrate integrated waveguide gap structure through the metal short-circuit column 502, which is equivalent to that six gaps are formed on the cylindrical waveguide. Six rectangular coupling gaps are required to be positioned under the peripheral hexagonal patches, and the dielectric constants of the upper dielectric substrate 2 and the lower dielectric substrate 4 are matched, so that the resonant frequency of the cylindrical waveguide is ensured to be lower than that of the ultra-surface omnidirectional mode.
The super-surface structure has a horizontally polarized omnidirectional mode and a vertically polarized omnidirectional mode, however, the wideband omnidirectional antenna of the present invention needs to have a vertical polarization, and thus, excitation of the horizontally polarized mode needs to be avoided, so that polarization purity and integrity of the pattern are ensured. For this reason, rectangular patch gaps are formed on six peripheral regular hexagonal patches 102, and the rectangular patch gaps point to the center of the super-surface structure; the current distribution of the horizontal polarization mode is the direction of rotating around the center, and the current direction of the vertical polarization mode is the direction pointing to the center, namely the rectangular patch slot is parallel to the current of the vertical polarization mode, and has little influence on the vertical polarization mode; the rectangular patch slot is perpendicular to the current direction of the horizontal polarization mode, and the rectangular patch slot does not divide the regular hexagonal patch into two blocks, so that the rectangular patch slot can be regarded as inductance loading, the electric length of the horizontal polarization mode is increased, and the resonance frequency of the horizontal polarization mode is reduced, so that the rectangular patch slot is lower than the resonance frequency of the cylindrical waveguide, and cannot be effectively excited. In addition, the starting point of the rectangular patch slit is located at the middle position of the outer edge of the peripheral regular hexagonal patch 102, and the integrity of the edge near one side of the central regular hexagonal patch 101 is maintained, so that the energy coupling with the central patch is ensured. To further increase the symmetry of the super-surface structure, six regular hexagonal patches 103 are designed in the present invention, so that the peripheral contour envelope of the super-surface structure is more nearly circular.
In order to expand the bandwidth of the antenna, the invention adopts the strategy of combining the antennas, and a monopole antenna is added on the basis of the super-surface antenna, and the resonance frequency of the monopole antenna is lower than that of the super-surface structure, thereby expanding the low-frequency working range of the antenna; the monopole antenna is formed by vertically extending a feed metal column 6 to the upper surface of an upper dielectric substrate 2, and the feed metal column 6 is used as an excitation structure of a cylindrical waveguide. The middle metal plate 3 is provided with a circular feed gap, and the size of the gap is matched and designed, so that the feed metal column 6 can feed the cylindrical waveguide and can radiate for the monopole antenna. Meanwhile, since the vertical omni-directional mode of the super-surface structure is an electric field null point at the center, the feeding metal post 6 does not affect the operation of the super-surface antenna. For the monopole antenna formed by the feed metal posts 6, the super-surface structure can be regarded as artificial magnetic conductors which are periodically arranged, so that the feed metal posts are reduced6, thus, length of extension of the feeding metal post 6lLess than one quarter of the wavelength corresponding to the lowest frequency. For the monopole antenna formed by the feed metal posts 6, the working frequency of the monopole antenna is lower than the cut-off frequency of the cylindrical waveguide, and the cylindrical waveguide does not influence the radiation performance of the monopole antenna.
For an omni-directional antenna on a limited large floor, the beam of the omni-directional antenna can be tilted upwards, which is caused by induced current on the floor; in order to reduce the induced current on the floor, the invention provides an arc-shaped gap on the middle metal plate 3. Because the antenna of the invention has very wide bandwidth, one arc-shaped slot can not realize the elimination of the floor induced current on the whole working frequency band, therefore, the invention adopts two inner arc-shaped slots 303 and outer arc-shaped slots 304 with different radians, and the radians (central angles) of the inner arc-shaped slots and the outer arc-shaped slots respectively satisfy the relation:
wherein, the liquid crystal display device comprises a liquid crystal display device,λ H for the wavelength in the medium corresponding to the highest operating frequency,λ L for the wavelength in the medium corresponding to the lowest operating frequency,r 3 is the radius of the inner circular arc gap,r 4 is the radius of the outer arc gap.
In conclusion, based on the technical scheme and the working principle thereof, the invention has the beneficial effects that:
the invention provides an ultra-surface broadband omnidirectional antenna with low out-of-roundness, which adopts a regular hexagon patch splicing mode with smaller rotation angle, optimizes the problem of poor rotation symmetry existing in the traditional square patch splicing mode, and ensures that the antenna has lower out-of-roundness in the horizontal direction; the combination of the super surface and the monopole solves the problem of narrow bandwidth and high section of the omnidirectional monopole antenna, and widens the bandwidth of the antenna; the maximum upwarping radiation direction is adjusted to the horizontal direction by introducing an arc gap in the floor; finally, the omnidirectional antenna has the advantages of wide bandwidth, low section, low out-of-roundness and horizontal maximum radiation direction.
Drawings
Fig. 1 is a schematic side view of an ultra-surface wideband omni-directional antenna with low out-of-roundness.
Fig. 2 is a schematic top view of the low out-of-roundness ultra-surface broadband omni-directional antenna of the present invention.
Fig. 3 is a schematic diagram of the structure of an intermediate metal layer of the low out-of-roundness ultra-surface broadband omni-directional antenna of the present invention.
Fig. 4 is a schematic diagram of the bottom view structure of the low out-of-roundness ultra-surface broadband omni-directional antenna of the present invention.
Fig. 5 is an illustration of an S of a low out-of-roundness ultra-surface wideband omni-directional antenna in an embodiment of the present invention 11 And (5) a parameter simulation result graph.
Fig. 6 is a horizontal plane pattern of a low out-of-roundness ultra-surface broadband omni-directional antenna at 2GHz in an embodiment of the present invention.
Fig. 7 is a horizontal plane pattern of a low out-of-roundness ultra-surface broadband omni-directional antenna at 3GHz in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantageous effects of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
The embodiment provides an ultra-surface broadband omni-directional antenna with low out-of-roundness, the structure of which is shown in fig. 1-4 and is in a circular structure, and the ultra-surface broadband omni-directional antenna specifically comprises: the ground metal plate 5, the lower dielectric substrate 4, the middle metal plate 3, the upper dielectric substrate 2, the super-surface structure 1 and the feeding metal post 6 are stacked in order from bottom to top.
Furthermore, the lower dielectric substrate 4 and the upper dielectric substrate 2 adopt round structures with the same size, and the radiuses are bothr 1 The method comprises the steps of carrying out a first treatment on the surface of the The lower dielectric substrate 4 has a height ofh 2 A relative dielectric constant of ε 2 The method comprises the steps of carrying out a first treatment on the surface of the The height of the upper dielectric substrate 2 ish 1 A relative dielectric constant of ε 1 . In the present embodiment of the present invention,r 1 =55 mm，h 1 =4 mm，ε 1 =3.5，h 2 =1 mm，ε 2 =2.2。
further, the super surface structure is disposed at a central position of the upper surface of the upper dielectric substrate 2, as shown in fig. 2, and is composed of a central regular hexagonal patch 101, six peripheral regular hexagonal patches 102 and six corner-cut regular hexagonal patches 103; the central regular hexagonal patch 101 is located at a central position, and six peripheral regular hexagonal patches 102 are arranged around the central regular hexagonal patch 101 and together form a honeycomb structure; a corner-cut regular hexagon patch 103 is arranged between adjacent peripheral regular hexagon patches 102 respectively, and the outer edge of the corner-cut regular hexagon patch 103 coincides with an circumscribed circle of the honeycomb structure; the center position of the center regular hexagon patch 101 is provided with an upper regular hexagon window, and the edges of the upper regular hexagon window and the center regular hexagon patch are parallel to each other; rectangular patch gaps are formed in the peripheral regular hexagonal patches 102, and the rectangular patch gaps point to the center of the central regular hexagonal patch from the middle position (starting point) of the outer edge of the peripheral regular hexagonal patch; the side lengths of the central regular hexagon patch 101, the peripheral regular hexagon patch 102 and the chamfer regular hexagon patch 103 are allw 1 The spacing between adjacent patches isgThe side length of the upper regular hexagon window isw 2 The length of the rectangular patch gap isl s1 With a width ofw s1 ，1.25w 1 ≤l s1 ≤1.35w 1 . In the present embodiment of the present invention,w 1 =11 mm，g=1 mm，w 2 =2 mm，l s1 =14 mm，w s1 =0.5 mm。
further, the middle metal plate 3 is disposed on the lower surface of the upper dielectric substrate 2, as shown in fig. 3, a circular feed slot 301, six rectangular coupling slots 302, six inner arc slots 303 and six outer arc slots 304 are formed on the middle metal plate 3; the circular feed slot 301 is located at the center position, six rectangular coupling slots 302 are arranged around the circular feed slot 301, and the rectangular coupling slots 302 are located right below the peripheral regular hexagonal patch 102 and perpendicular to the rectangular patch slots; inner circular arc slit 303The inner arc gap 303 and the outer arc gap 304 are sequentially arranged on the outer side of the rectangular coupling gap 302, the centers of the inner arc gap 303 and the outer arc gap 304 are positioned on the same radial line of the upper medium substrate 2, and the centers of the inner arc gap and the outer arc gap 304 are coincident with the center of the upper medium substrate 2; the radius of the intermediate metal plate 3 isr 1 The radius of the circular feed slot 301 isr 2 The length of the rectangular coupling slot 302 isl s2 With a width ofw s2 The linear distance from the center of the upper medium substrate isd 1 The radius of the inner arc slit 303 isr 3 Degree is as followsθ 1 The radius of the outer arc slit 304 isr 4 Degree is as followsθ 2 . In the present embodiment of the present invention,l s2 =20 mm，w s2 =0.6 mm，d 1 =22.5 mm，r 2 =1.15 mm，r 3 =45mm，r 4 =50mm，θ 1 =42°，θ 2 =50°, the widths of the inner arc slit 303 and the outer arc slit 304 are both 0.5 mm.
Further, the grounding metal plate 5 is disposed at a central position of the lower surface of the lower dielectric substrate 4, as shown in fig. 4, the grounding metal plate 5 has a circular structure, a lower circular window 501 is disposed at a central position thereof, and an edge position thereof is connected with the middle metal plate 3 through a plurality of metal shorting posts 502; the metal shorting posts 502 penetrate through the lower dielectric substrate 4 and are arranged at equal intervals; the radius of the grounding metal plate 5 isr 5 The radius of the lower round window 501 isr 6 ，r 1 >r 4 >r 3 >r 5 ，r 6 >r 2 . In the present embodiment of the present invention,r 5 =32 mm，r 6 =1.3 mm, the metal shorting posts 502 are arranged in steps of 2 ° around the center.
Further, the feeding metal post 6 is located at the center of the antenna, and its lower end is connected to the inner conductor of the coaxial feeding connector and passes through the lower circular window 501, the lower dielectric substrate 4, the circular feeding slot 301, the upper dielectric substrate 2 and the upper regular hexagonal window to the upper dielectric substrateThe upper surface of the plate 2 extends vertically; the length of the upper end of the feed metal column 6 extending vertically to the upper surface of the upper layer dielectric substrate 2 islThe radius of the feeding metal post 6 isr 7 And satisfies the relationship:λ/10>(r 2 -r 7 )>λand/15, lambda is the free space wavelength corresponding to the lowest operating frequency. In the present embodiment of the present invention,l=28mm，r 7 =0.5 mm。
simulation test is carried out on the ultra-surface broadband omnidirectional antenna with low out-of-roundness in the embodiment, and the results are shown in fig. 5-7; s of the antenna as shown in FIG. 5 11 As can be seen from the results of the parameter simulation, the antenna achieves an impedance bandwidth of 78%; as shown in fig. 6 and 7, the normalized patterns of the antenna at the horizontal planes of 2GHz and 3GHz are shown, and as can be seen from the graph, the out-of-roundness of the antenna at the horizontal plane is less than 0.2dB, and the antenna has the characteristic of low out-of-roundness.
While the invention has been described in terms of specific embodiments, any feature disclosed in this specification may be replaced by alternative features serving the equivalent or similar purpose, unless expressly stated otherwise; all of the features disclosed, or all of the steps in a method or process, except for mutually exclusive features and/or steps, may be combined in any manner.
Claims (6)
1. A low out-of-roundness ultra surface wideband omni-directional antenna, comprising: a grounding metal plate (5), a lower dielectric substrate (4), an intermediate metal plate (3), an upper dielectric substrate (2), a super-surface structure (1) and a feeding metal column (6) are sequentially stacked from bottom to top; it is characterized in that the method comprises the steps of,
the lower medium substrate (4) and the upper medium substrate (2) adopt round structures with the same size;
the super-surface structure is composed of a central regular hexagonal patch (101), six peripheral regular hexagonal patches (102) and six corner-cut regular hexagonal patches (103); the central regular hexagon patch (101) is positioned at the central position, and six peripheral regular hexagon patches (102) are arranged around the central regular hexagon patch (101) and jointly form a honeycomb structure; corner-cut regular hexagonal patches (103) are respectively arranged between adjacent peripheral regular hexagonal patches (102), and the outer edges of the corner-cut regular hexagonal patches (103) are overlapped with circumscribed circles of the honeycomb structure; the center position of the center regular hexagon patch (101) is provided with an upper layer regular hexagon window, and the edges of the upper layer regular hexagon window and the center regular hexagon patch are parallel to each other; rectangular patch gaps are formed in the peripheral regular hexagonal patches (102), and the rectangular patch gaps point to the center of the central regular hexagonal patch from the middle position of the outer edge of the peripheral regular hexagonal patch;
the middle metal plate (3) is provided with a circular feed gap (301), six rectangular coupling gaps (302), six inner circular arc gaps (303) and six outer circular arc gaps (304); the circular feed gap (301) is positioned at the center, six rectangular coupling gaps (302) are arranged around the circular feed gap (301), and the rectangular coupling gaps (302) are positioned right below the peripheral regular hexagonal patch (102) and perpendicular to the rectangular patch gaps; the inner circular arc gap (303) and the outer circular arc gap (304) are sequentially arranged on the outer side of the rectangular coupling gap (302), the centers of the inner circular arc gap (303) and the outer circular arc gap (304) are positioned on the same radial line of the upper medium substrate (2), and the centers of the inner circular arc gap (303) and the outer circular arc gap (304) are coincident with the center of the upper medium substrate (2);
the grounding metal plate (5) is of a circular structure, a lower layer circular window (501) is formed in the center of the grounding metal plate, and the edge of the grounding metal plate is connected with the middle metal plate (3) through a plurality of metal short-circuit posts (502); the metal short-circuit posts (502) penetrate through the lower dielectric substrate (4) and are arranged at equal intervals;
the feeding metal column (6) is positioned at the center of the antenna, the lower end of the feeding metal column is connected with the inner conductor of the coaxial feeding connector, and the feeding metal column passes through the lower layer round window (501), the lower layer dielectric substrate (4), the round feeding gap (301), the upper layer dielectric substrate (2) and the upper layer regular hexagon window to extend vertically to the upper surface of the upper layer dielectric substrate (2).
2. The low out-of-roundness ultra surface broadband omnidirectional antenna of claim 1, wherein the lower dielectric substrate is4) The radii of the upper medium substrate (2) and the middle metal plate (3) are allr 1 The radius of the circular feed slot (301) isr 2 The radius of the inner arc slit (303) isr 3 The radius of the outer arc gap (304) isr 4 The radius of the grounding metal plate (5) isr 5 The radius of the lower round window (501) isr 6 The radius of the feeding metal column (6) isr 7 And satisfies the relationship:
r 1 >r 4 >r 3 >r 5 ，r 6 >r 2 ，λ/10>(r 2 -r 7 )> λ/15，
wherein lambda is the free space wavelength corresponding to the lowest operating frequency.
3. The low out-of-roundness ultra surface broad band omni-directional antenna of claim 1, wherein the side length of the center regular hexagonal patch (101), the peripheral regular hexagonal patch (102) and the chamfer regular hexagonal patch (103) are allw 1 The spacing between adjacent patches isgThe method comprises the steps of carrying out a first treatment on the surface of the The length of the rectangular patch gap isl s1 ，1.25 w 1 ≤l s1 ≤1.35 w 1 。
4. The low out-of-roundness ultra surface broadband omnidirectional antenna of claim 1, wherein the degree of the inner arc slot (303) isθ 1 The degree of the outer arc gap (304) isθ 2 ，θ 1 And (3) withθ 2 The following respectively satisfy:
wherein, the liquid crystal display device comprises a liquid crystal display device,λ H for the wavelength in the medium corresponding to the highest operating frequency,λ L for the wavelength in the medium corresponding to the lowest operating frequency, r 3 is the radius of the inner circular arc gap,r 4 is the radius of the outer arc gap.
5. The ultra-surface broadband omnidirectional antenna with low out-of-roundness according to claim 1, characterized in that the length of the feeding metal post (6) extending vertically to the upper surface of the upper dielectric substrate (2) isl，l<λ/4，λThe free space wavelength corresponding to the lowest operating frequency.
6. The low out-of-roundness ultra surface broadband omni-directional antenna of claim 1, wherein the middle metal plate (3), the lower dielectric substrate (4) and the ground metal plate (5) together form a substrate integrated waveguide structure through the metal shorting post (502), and the resonant frequency of the substrate integrated waveguide structure is lower than the resonant frequency of the omni-directional mode of the ultra surface structure.
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