A low-profile dual-band broadband antenna

Abstract

This invention discloses a low-profile dual-band broadband antenna, relating to the field of wireless communication antenna technology. It includes a radiating element, a ground plane, a shorting plate, and a coaxial cable. The radiating element comprises a dielectric substrate and a first cladding structure. The first cladding structure is located on one side of the dielectric substrate and includes a first cladding portion and a second cladding portion. The first cladding portion has a first gap and a second gap. The first cladding portion is connected to the ground plane via the shorting plate. The coaxial cable is connected to both the first cladding portion and the second cladding portion. This low-profile dual-band broadband antenna can achieve dual-band operation.

Description

Technical Field

[0001] This invention relates to the field of wireless communication antenna technology, and in particular to a low-profile dual-band broadband antenna. Background Technology

[0002] To effectively address the strict space constraints on antenna integration in current aerospace vehicles and various types of IoT mobile devices, and to meet the requirements of broadband and multi-band operation within a limited space, current antenna technologies can only achieve a single frequency band. Summary of the Invention

[0003] The purpose of this invention is to provide a low-profile dual-band broadband antenna to solve the problems existing in the prior art and to achieve dual-band operation.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] The present invention provides a low-profile dual-band broadband antenna, comprising: a radiating element, a ground plane, a shorting plate, and a coaxial cable. The radiating element includes a dielectric substrate and a first cladding structure. The first cladding structure is located on one side of the dielectric substrate and includes a first cladding portion and a second cladding portion. The first cladding portion is provided with a first gap and a second gap. The first cladding portion is connected to the ground plane through the shorting plate. The coaxial cable is connected to the first cladding portion and the second cladding portion respectively.

[0006] Preferably, the first coating portion is provided with two symmetrical first gaps and two symmetrical second gaps, wherein the first gaps are located inside the second gaps.

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

[0008] Preferably, the second coating portion is located at one end of the first coating portion, the centerline of the second coating portion coincides with the centerline of the first coating portion, the second coating portion has an axisymmetric structure, and the outer contour of the second coating 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 sequentially. 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 and the third side structure are arranged perpendicularly, 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 radiating unit further includes a second coating structure located on the side of the dielectric plate near the floor, and the second coating structure is rectangular.

[0011] Preferably, the dielectric board is a fiberglass board, and both the first and second coating structures are made of copper.

[0012] Preferably, the short-circuit plate is provided with a first positioning groove, and the floor is provided with a second positioning groove, the first positioning groove and the second positioning groove are positioned correspondingly.

[0013] Preferably, the radiant unit and the floor are supported by a support structure made of non-metallic material. The support structure includes a bolt, a support sleeve, and a nut. The bolt passes through a first mounting hole on the floor and a second mounting hole on the dielectric plate. The nut is threadedly connected to the bolt. The support sleeve is located between the floor and the radiant unit.

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

[0015] The present invention achieves the following technical effects compared to the prior art:

[0016] The low-profile dual-band broadband antenna of the present invention can achieve dual-band and broadband characteristics within a limited space, effectively expanding the system spectrum utilization and improving the system communication capacity, and further promoting the in-depth development of aerospace and Internet of Things communication technologies. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an isometric view of the low-profile dual-frequency broadband antenna of the present invention;

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

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

[0021] Figure 4 This is a bottom view of the radiating unit of the present invention;

[0022] Figure 5 This is a top view of the first coating structure of the present invention;

[0023] Figure 6 This is a top view of the second coating portion of the present invention;

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

[0025] Figure 8 This is an isometric view of the short-circuit plate of the present invention;

[0026] Figure 9 This is a side view of the short-circuit plate of the present invention;

[0027] Figure 10 This is an isometric view of the support structure of the present invention;

[0028] Figure 11 The standing wave curve of the low-profile dual-frequency broadband antenna of the present invention;

[0029] Figure 12 The low-frequency radiation pattern of the low-profile dual-band broadband antenna of the present invention is shown.

[0030] Figure 13 The high-frequency radiation pattern of the low-profile dual-band broadband antenna of the present invention;

[0031] Figure 14 The gain curve of the low-profile dual-band broadband antenna of the present invention is shown.

[0032] In the diagram: 1-floor, 2-short circuit plate, 3-coaxial cable, 4-dielectric plate, 5-first coating section, 6-second coating section, 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 coating structure, 16-first positioning groove, 17-second positioning groove, 18-bolt, 19-support sleeve, 20-nut. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] The purpose of this invention is to provide a low-profile dual-band broadband antenna to solve the problems existing in the prior art and to achieve dual-band operation.

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be 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 element, a ground plane 1, a shorting piece 2, and a coaxial cable 3. The radiating element includes a dielectric substrate 4 and a first cladding structure. The first cladding structure is located on one side of the dielectric substrate 4 and includes a first cladding portion 5 and a second cladding portion 6. The first cladding portion 5 is connected to the ground plane 1 via the shorting piece 2. The coaxial cable 3 is connected to both the first cladding portion 5 and the second cladding portion 6. This embodiment achieves frequency impedance matching and pattern resonance for both low-frequency 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 has an axisymmetric structure. The first coating portion 5 has two symmetrical first gaps 7 and two symmetrical second gaps 8. The first gaps 7 are located inside the second gaps 8, and the size of the first gaps 7 is larger than the size of the second gaps 8. The centerline of the coaxial cable 3 is coplanar with the centerline of the first coating portion 5.

[0039] In this embodiment, the second coating portion 6 is located at one end of the first coating portion 5, and the center line of the second coating portion 6 coincides with the center line of the first coating portion 5. The second coating portion 6 has an axisymmetric structure. The outer contour of the second coating 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 arranged sequentially. The first side structure 9 and the fourth side structure 12 are arranged in parallel, and 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 radiating unit further 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 to the first cladding structure, thereby broadening and optimizing the frequency impedance matching and radiation pattern bandwidth of the low-frequency and high-frequency bands of the first cladding structure.

[0041] In this embodiment, the dielectric substrate 4 is made of glass fiber board with a dielectric constant of 4.4, and the first and second coating structures 15 are both made of copper.

[0042] In this embodiment, both the ground plane 1 and the shorting plate 2 are copper plates. The shorting plate 2 has a Z-shaped cross-section and is provided with a first positioning groove 16. The ground plane 1 is provided with a second positioning groove 17. The first positioning groove 16 and the second positioning groove 17 are positioned correspondingly, which can accurately locate the welding position between the shorting plate 2 and the ground plane 1. The first cladding portion 5 of the radiating unit and the ground plane 1 are respectively connected to the shorting plate 2 by soldering. This allows the profile height of the low-profile dual-band broadband antenna in this embodiment to be reduced to 0.034λ of the low-frequency center frequency, where λ is the wavelength. The low-frequency range is 1.337~1.681GHz, and its center frequency is 1.509GHz. The corresponding low-frequency center wavelength is 198.8 mm. Therefore, 0.034×198.8≈7 (mm), that is, the profile height of the low-profile dual-band broadband antenna in this embodiment is only 7 mm. The ground plane 1 is rectangular. The ground plane 1 can serve as a reflector for directional low-profile dual-band broadband antenna pattern radiation and can also serve as the DC ground of the radiating unit.

[0043] In this embodiment, a support structure is used to support the dielectric plate 4 of the radiating unit and the floor 1. The support structure is made of non-metallic material and includes a bolt 18, a support sleeve 19 and a nut 20. The bolt 18 passes through the first mounting hole on the floor 1 and the 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 radiating unit.

[0044] In this embodiment, the dielectric substrate 4 of the radiating unit has dimensions of 49.5mm (length) × 48mm (width) × 1mm (thickness), and two second mounting holes with a diameter of 3mm are provided on the dielectric substrate 4. The dimensions of the first cladding portion 5 are 38.8mm (length) × 48mm (width). The first gap 7 and the second gap 8 are both rectangular. The dimensions of the first gap 7 are 18.1mm (length) × 1.9mm (width); and the dimensions of the second gap 8 are 16mm (length) × 2mm (width). In the second cladding structure 15, the length a of the fourth side structure 12 is 16mm; the length b of the fifth side structure 13 is the same as the length b′ of the third side structure 11, which is 3mm; the length c of the sixth side structure 14 is the same as the length c′ of the second side structure 10, which is 11.5mm; and the length d of the first side structure 9 is 6mm. The dimensions of the second cladding are 12.5mm (length) × 48mm (width). The shorting piece 2 is formed by bending a 1mm thick copper plate. The dimension e of the part of the shorting piece 2 in contact with the ground plate 1 is 4.5mm, the height f of the shorting piece 2 is 6mm, the dimension g of the part of the shorting piece 2 in contact with the first cladding 5 is 5mm, and the width h of the shorting piece 2 is 48mm. The ground plate 1 is a 1mm thick copper plate with two first mounting holes of 3mm in diameter. The dimensions of the ground plate 1 are 80mm (length) × 50mm (width). The height of the support sleeve 19 is 5mm.

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

[0046] Figure 11 The curve values ​​that satisfy VSWR ≤ 2 in each bandwidth of the low frequency band (1.337-1.681GHz) and the high frequency band (4.501-4.96GHz) are characterized by this embodiment. Figure 12 This embodiment characterizes a typical two-dimensional planar radiation pattern in the low-frequency band (1.337-1.681 GHz). Figure 13 This embodiment characterizes a typical two-dimensional planar radiation pattern in the high-frequency band (4.501-4.96 GHz); Figure 14 This embodiment characterizes the gain curve values ​​within each bandwidth of the low-frequency band (1.337-1.681GHz) and the high-frequency band (4.501-4.96GHz).

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

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

[0049] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A low-profile dual-band broadband antenna, characterized in that: include: The radiating unit comprises a radiating unit, a floor, a shorting plate, and a coaxial cable. The radiating unit includes a dielectric plate and a first cladding structure. The first cladding structure is located on the side of the dielectric plate away from the floor. The first cladding structure includes a first cladding portion and a second cladding portion. The first cladding portion is provided with a first gap and a second gap. The first cladding portion is connected to the floor through the shorting plate. The coaxial cable is connected to the first cladding portion and the second cladding portion respectively. The first coating portion is provided with two symmetrical first gaps and two symmetrical second gaps, with the first gaps located inside the second gaps; The size of the first gap is larger than the size of the second gap; The radiating unit further includes a second coating structure located on the side of the dielectric plate closer to the floor; 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. The medium plate is a fiberglass board.

2. The low-profile dual-band broadband antenna according to claim 1, characterized in that: The second coating portion is located at one end of the first coating portion, and the center line of the second coating portion coincides with the center line of the first coating portion. The second coating portion has an axisymmetric structure. The outer contour of the second coating 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 sequentially. The first side structure and the fourth side structure are arranged in parallel, and 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 and the third side structure are arranged perpendicularly, and the second side structure and the sixth side structure are arranged symmetrically.

3. The low-profile dual-band broadband antenna according to claim 1, characterized in that: The second coating structure is rectangular.

4. The low-profile dual-band broadband antenna according to claim 1, characterized in that: Both the first and second cladding structures are made of copper.

5. 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, the first positioning groove and the second positioning groove are in corresponding positions.

6. The low-profile dual-band broadband antenna according to claim 1, characterized in that: The radiant unit and the floor are supported by a support structure made of non-metallic material. The support structure includes bolts, support sleeves and nuts. The bolts pass through a first mounting hole on the floor and a second mounting hole on the medium plate. The nuts are threadedly connected to the bolts. The support sleeves are located between the floor and the radiant unit.

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

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