Low-profile double-frequency broadband antenna

Abstract

The invention discloses a low-profile double-frequency broadband antenna, and relates to the technical field of wireless communication antennae, the low-profile double-frequency broadband antenna comprises a radiation unit, a floor, a short circuit plate and a coaxial cable, the radiation unit comprises a dielectric plate and a first coating structure, and the first coating structure is located on one side of the dielectric plate; the first coating structure comprises a first coating part and a second coating part, the first coating part is provided with a first gap and a second gap, the first coating part is connected with the floor through the short circuit plate, and the coaxial cable is respectively connected with the first coating part and the second coating part. The low-profile double-frequency broadband antenna provided by the invention can realize double frequency bands.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless communication antennas, and in particular to a low-profile dual-frequency broadband antenna. Background Art

[0002] In order to effectively solve the current aerospace and various types of IoT mobile devices, there are strict restrictions on the antenna integration space, and it is required to achieve broadband and multi-band requirements within a limited space. However, the antenna in the existing technology can only achieve a single frequency band. Summary of the invention

[0003] The object of the present invention is to provide a low-profile dual-frequency broadband antenna to solve the problems existing in the above-mentioned prior art and to achieve dual frequency bands.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a low-profile dual-band broadband antenna, comprising: a radiation unit, a floor, a short-circuit plate and a coaxial cable, wherein the radiation unit comprises a dielectric plate and a first coating structure, wherein the first coating structure is located on one side of the dielectric plate, wherein the first coating structure comprises a first coating portion and a second coating portion, wherein the first coating portion is provided with a first gap and a second gap, wherein the first coating portion is connected to the floor through the short-circuit plate, and wherein the coaxial cable is connected to the first coating portion and the second coating portion respectively.

[0006] Preferably, the first covering portion is provided with two symmetrical first slits and two symmetrical second slits, and the first slits are located inside the second slits.

[0007] Preferably, the size of the first gap is larger than the size of the second gap.

[0008] Preferably, the second covering portion is located at one end of the first covering portion, the center line of the second covering portion coincides with the center line of the first covering portion, the second covering portion is an axisymmetric structure, the outer contour of the second covering portion includes a first side structure, a second side structure, a third side structure, a fourth side structure, a fifth side structure and a sixth side structure arranged in sequence, the first side structure and the fourth side structure are arranged in parallel, the size of the first side structure is smaller than the size of the fourth side structure, the third side structure and the fifth side structure are arranged in parallel and have the same size, the first side structure is arranged perpendicular to the third side structure, and the second side structure and the sixth side structure are arranged symmetrically.

[0009] Preferably, the outer conductor of the coaxial cable is connected to the first coating portion, and the inner conductor of the coaxial cable is connected to the second coating portion.

[0010] Preferably, the radiation unit further includes a second cladding structure, the second cladding structure is located on a side of the dielectric plate close to the floor, and the second cladding structure is rectangular.

[0011] Preferably, the dielectric board is a glass fiber board, and the first cladding structure and the second cladding structure are both made of copper.

[0012] Preferably, a first positioning groove is provided on the short-circuit plate, and a second positioning groove is provided on the floor, and the first positioning groove and the second positioning groove correspond to each other in position.

[0013] Preferably, a support structure is used between the radiation unit and the floor to achieve support, and the support structure is made of non-metal. The support structure includes bolts, support sleeves and nuts. The bolts pass through the first mounting holes on the floor and the second mounting holes on the dielectric plate. The nuts are threadedly connected to the bolts, and the support sleeves are located between the floor and the radiation unit.

[0014] Preferably, the floor and the short-circuit plate are both copper plates.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] The low-profile dual-frequency broadband antenna of the present invention can realize the dual-frequency and broadband characteristics requirements in a limited space, can effectively expand the system spectrum utilization and improve the system communication capacity, and further promote the in-depth development of aerospace and Internet of Things communication technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is an axonometric diagram of the low profile dual-frequency broadband antenna of the present invention;

[0019] Figure 2 A top view of the low-profile dual-band broadband antenna of the present invention;

[0020] Figure 3 A top view of a radiation unit of the present invention;

[0021] Figure 4 A bottom view of a radiation unit of the present invention;

[0022] Figure 5 A top view of the first coating structure of the present invention;

[0023] Figure 6 A top view of the second covering portion of the present invention;

[0024] Figure 7 It is a schematic diagram of the dimensions of the second coating portion of the present invention;

[0025] Figure 8 It is an axonometric diagram of the short-circuit plate of the present invention;

[0026] Fig. 9 It is a side view of the short-circuit plate of the present invention;

[0027] Fig.10 is an axonometric view of the support structure of the present invention;

[0028] Fig.11 is a standing wave curve of the low profile dual-band broadband antenna of the present invention;

[0029] Fig.12 The low-frequency band directional pattern of the low-profile dual-band broadband antenna of the present invention;

[0030] Fig.13 The high-band directional pattern of the low-profile dual-band broadband antenna of the present invention;

[0031] Fig.14 is a gain curve of the low profile dual-band broadband antenna of the present invention;

[0032] In the figure: 1-floor, 2-short-circuit plate, 3-coaxial cable, 4-dielectric plate, 5-first covering portion, 6-second covering portion, 7-first gap, 8-second gap, 9-first side structure, 10-second side structure, 11-third side structure, 12-fourth side structure, 13-fifth side structure, 14-sixth side structure, 15-second covering structure, 16-first positioning groove, 17-second positioning groove, 18-bolt, 19-support sleeve, 20-nut. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The object of the present invention is to provide a low-profile dual-frequency broadband antenna to solve the problems existing in the above-mentioned prior art and to achieve dual frequency bands.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figures 1 to 14 As shown, this embodiment provides a low-profile dual-band broadband antenna, including: a radiating unit, a floor 1, a short-circuit plate 2 and a coaxial cable 3. The radiating unit includes a dielectric plate 4 and a first cladding structure. The first cladding structure is located on one side of the dielectric plate 4. The first cladding structure includes a first cladding portion 5 and a second cladding portion 6. The first cladding portion 5 is connected to the floor 1 through the short-circuit plate 2. The coaxial cable 3 is respectively connected to the first cladding portion 5 and the second cladding portion 6. This embodiment can achieve frequency impedance matching and directional pattern resonance in low frequency bands and high frequency bands through the first cladding structure. The low frequency band is achieved through the first cladding portion 5, and the high frequency band is achieved through the first cladding portion 5.

[0037] Specifically, in this embodiment, the outer conductor of the coaxial cable 3 is welded to the first cladding portion 5, and the inner conductor of the coaxial cable 3 is welded to the second cladding portion 6 to complete the low-profile dual-band broadband antenna feeding.

[0038] In this embodiment, the first coating portion 5 is an axisymmetric structure, and is provided with two symmetrical first slots 7 and two symmetrical second slots 8. The first slot 7 is located inside the second slot 8, and the size of the first slot 7 is larger than the size of the second slot 8. The center line of the coaxial cable 3 is coplanar with the center line of the first coating portion 5.

[0039] In this embodiment, the second covering portion 6 is located at one end of the first covering portion 5, the center line of the second covering portion 6 coincides with the center line of the first covering portion 5, the second covering portion 6 is an axisymmetric structure, and the outer contour of the second covering portion 6 includes a first side structure 9, a second side structure 10, a third side structure 11, a fourth side structure 12, a fifth side structure 13 and a sixth side structure 14 which are arranged in sequence, the first side structure 9 and the fourth side structure 12 are arranged in parallel, the size of the first side structure 9 is smaller than the size of the fourth side structure 12, the third side structure 11 and the fifth side structure 13 are arranged in parallel and have the same size, the first side structure 9 and the third side structure 11 are arranged perpendicularly, and the second side structure 10 and the sixth side structure 14 are arranged symmetrically.

[0040] In this embodiment, the radiation unit also includes a second cladding structure 15. The first cladding structure is located on the side of the dielectric plate 4 away from the floor 1, and the second cladding structure 15 is located on the side of the dielectric plate 4 close to the floor 1. The second cladding structure 15 is rectangular. The second cladding structure 15 is electromagnetically coupled with the first cladding structure to broaden and optimize the frequency impedance matching and radiation pattern bandwidth of the low frequency band and the high frequency band of the first cladding structure.

[0041] In this embodiment, the dielectric plate 4 is made of a glass fiber plate with a dielectric constant of 4.4, and the first cladding structure and the second cladding structure 15 are both made of copper.

[0042] In this embodiment, the floor 1 and the short-circuit plate 2 are both copper plates. The cross section of the short-circuit plate 2 is Z-shaped, and a first positioning groove 16 is provided on the short-circuit plate 2, and a second positioning groove 17 is provided on the floor 1. The first positioning groove 16 and the second positioning groove 17 correspond to each other, and the welding position of the short-circuit plate 2 and the floor 1 can be accurately located. The first covering portion 5 of the radiation unit and the floor 1 are respectively connected to the short-circuit plate 2 by soldering, which can reduce the cross-sectional height of the low-profile dual-band broadband antenna of this embodiment to 0.034λ of the low-frequency band center frequency, λ is the wavelength, the low-frequency band frequency range is 1.337~1.681GHz, its center frequency is 1.509GHz, and the corresponding low-frequency band center wavelength is 198.8mm, then 0.034×198.8≈7 (mm), that is, the cross-sectional height of the low-profile dual-band broadband antenna of this embodiment is only 7mm. The floor 1 is rectangular, and the floor 1 can be used as a reflector for the directional radiation of the low-profile dual-band broadband antenna pattern, and can also be used as a DC grounding of the radiation unit.

[0043] In this embodiment, a support structure is used between the dielectric plate 4 of the radiation unit and the floor 1 to achieve support. The support structure is made of non-metal and includes a bolt 18, a support sleeve 19 and a nut 20. The bolt 18 passes through a first mounting hole on the floor 1 and a second mounting hole on the dielectric plate 4. The nut 20 is threadedly connected to the bolt 18. The support sleeve 19 is located between the floor 1 and the radiation unit.

[0044] In this embodiment, the size of the dielectric plate 4 of the radiation unit is: 49.5mm (length) × 48mm (width) × 1mm (thickness), and two second mounting holes with a diameter of 3mm are provided on the dielectric plate 4. The size of the first coating portion 5 is: 38.8mm (length) × 48mm (width). The first gap 7 and the second gap 8 are both rectangular, and the size of the first gap 7 is: 18.1mm (length) × 1.9mm (width); the size of the second gap 8 is: 16mm (length) × 2mm (width). In the second coating structure 15, the length a of the fourth side structure 12 is 16mm; the length b of the fifth side structure 13 is the length b′ of the third side structure 11 is 3mm; the length c of the sixth side structure 14 is the length c′ of the second side structure 10 is 11.5mm; the length d of the first side structure 9 is 6mm. The size of the second coating is: 12.5mm (length) × 48mm (width). The short-circuit plate 2 is formed by folding a metal copper plate with a thickness of 1 mm. The size of the portion where the short-circuit plate 2 contacts the floor 1 is e=4.5 mm, the height of the short-circuit plate 2 is f=6 mm, the size of the portion where the short-circuit plate 2 contacts the first covering portion 5 is g=5 mm, and the width of the short-circuit plate 2 is h=48 mm. The floor 1 is a metal copper plate with a thickness of 1 mm and has two first mounting holes with a diameter of 3 mm. The size of the floor 1 is: 80 mm (length) × 50 mm (width). The height of the support sleeve 19 is 5 mm.

[0045] The dimensions of the above structures can be adjusted as needed.

[0046] Fig.11 Characterization Through this embodiment, the curve value of standing wave ≤ 2 is satisfied in each bandwidth of the low frequency band (1.337-1.681GHz) and the high frequency band (4.501-4.96GHz); Fig.12 Characterization Through this embodiment, a typical two-dimensional plane radiation pattern of the low frequency band (1.337-1.681GHz); Fig.13 Characterize the typical two-dimensional plane radiation pattern of the high frequency band (4.501-4.96GHz) through this embodiment; Fig.14 The present embodiment shows the gain curve values ​​in the bandwidths of the low frequency band (1.337-1.681 GHz) and the high frequency band (4.501-4.96 GHz).

[0047] The dual-frequency characteristics of the low-profile dual-frequency broadband antenna of the present embodiment are achieved through the first slit, the second slit and the second covering structure of the first covering portion, and can also be achieved by adjusting the width and welding position of the short-circuit piece; the broadband characteristics of the low-profile dual-frequency broadband antenna of the present embodiment are achieved by changing the current path through the first slit and the second slit of the first covering portion and the electromagnetic coupling between the second covering structure and the first covering structure.

[0048] The low-profile dual-band broadband antenna of this embodiment can realize the dual-band and broadband characteristics requirements in a limited space, effectively expand the system spectrum utilization and improve the system communication capacity, and further promote the in-depth development of aerospace and Internet of Things communication technologies.

[0049] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A low profile dual-band broadband antenna, characterized in that: include: A radiation unit, a floor, a short-circuit plate and a coaxial cable, wherein the radiation unit includes a dielectric plate and a first coating structure, wherein the first coating structure is located on one side of the dielectric plate, wherein the first coating structure includes a first coating portion and a second coating portion, wherein the first coating portion is provided with a first gap and a second gap, wherein the first coating portion is connected to the floor through the short-circuit plate, and wherein the coaxial cable is connected to the first coating portion and the second coating portion, respectively.

2. The low profile dual-band broadband antenna according to claim 1, characterized in that: The first covering portion is provided with two symmetrical first slits and two symmetrical second slits, and the first slits are located inside the second slits.

3. The low profile dual-band broadband antenna according to claim 1, characterized in that: The size of the first gap is greater than the size of the second gap.

4. The low profile dual-band broadband antenna according to claim 1, characterized in that: The second covering portion is located at one end of the first covering portion, the center line of the second covering portion coincides with the center line of the first covering portion, the second covering portion is an axisymmetric structure, the outer contour of the second covering portion includes a first side structure, a second side structure, a third side structure, a fourth side structure, a fifth side structure and a sixth side structure which are arranged in sequence, the first side structure and the fourth side structure are arranged in parallel, the size of the first side structure is smaller than the size of the fourth side structure, the third side structure and the fifth side structure are arranged in parallel and have the same size, the first side structure is arranged perpendicular to the third side structure, and the second side structure and the sixth side structure are arranged symmetrically.

5. The low profile dual-band broadband antenna according to claim 1, characterized in that: The outer conductor of the coaxial cable is connected to the first coating portion, and the inner conductor of the coaxial cable is connected to the second coating portion.

6. The low profile dual-band broadband antenna according to claim 1, characterized in that: The radiation unit further includes a second cladding structure, which is located on a side of the dielectric plate close to the floor, and is rectangular.

7. The low profile dual-band broadband antenna according to claim 6, characterized in that: The dielectric board is a glass fiber board, and the first cladding structure and the second cladding structure are both made of copper.

8. The low profile dual-band broadband antenna according to claim 1, characterized in that: The short-circuit plate is provided with a first positioning groove, and the floor is provided with a second positioning groove, and the first positioning groove and the second positioning groove are located correspondingly.

9. The low profile dual-band broadband antenna according to claim 1, characterized in that: A support structure is used between the radiation unit and the floor to achieve support. The support structure is made of non-metal and includes bolts, support sleeves and nuts. The bolts pass through the first mounting holes on the floor and the second mounting holes on the dielectric plate. The nuts are threadedly connected to the bolts. The support sleeves are located between the floor and the radiation unit.

10. The low profile dual-band broadband antenna according to claim 1, characterized in that: The floor and the short-circuit plate are both copper plates.

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